Screw pump stator structure

Abstract

The utility model discloses a screw pump stator structure which comprises an outer cylinder, and a stator assembly is arranged in the outer cylinder. The stator assembly comprises a rubber cylinder, two ends of the rubber cylinder are respectively clamped with a seat body, an annular cavity is formed between the outer wall of the rubber cylinder and the inner wall of the outer cylinder, the two seat bodies are connected through a fixing strip, and the fixing strip is located in the annular cavity; the problem that an aged rubber cylinder is difficult to disassemble and replace due to the fact that the rubber cylinder of an existing stator structure is prone to swelling, hardening or permanent deformation in long-term contact with a medium or in a high-temperature environment is solved.

Description

Technical Field

[0001] This utility model relates to the field of screw pumps, specifically to a screw pump stator structure. Background Technology

[0002] The stator and rotor structure of a screw pump are its core working components. The stator of a screw pump generally includes an outer cylinder and a rubber sleeve installed inside the outer cylinder. When the rotor rotates, it creates a volume change with the stator, pushing the liquid from the suction end to the discharge end. For example, Chinese patent CN204941920U provides a single screw pump stator, which includes a metal outer shell and a polyurethane layer covering its inner wall. A helical hole for screwing in the rotor is provided in the middle of the polyurethane layer. The metal outer shell is a 1.5-2.5mm thick metal tube, typically iron or copper. The polyurethane layer is a cast-molded structure. In existing screw pump stator structures like the one described above, the internal rubber sleeve is generally directly installed inside the outer shell. After prolonged use, the rubber sleeve will age and need periodic replacement. In existing stator structures, the rubber sleeve is prone to swelling, hardening, or permanent deformation under long-term contact with the medium or high-temperature environments, making it difficult to disassemble and replace the aged rubber sleeve. Utility Model Content

[0003] The purpose of this invention is to provide a screw pump stator structure that solves the problem that in existing stator structures, the rubber sleeve is prone to swelling, hardening, or permanent deformation under long-term contact with the medium or high-temperature environment, making it difficult to disassemble and replace the aged rubber sleeve.

[0004] To achieve the above objectives, this utility model provides a screw pump stator structure, which includes an outer cylinder and a stator assembly disposed inside the outer cylinder;

[0005] The stator assembly includes a rubber cylinder, with a seat body respectively engaged at both ends of the rubber cylinder. An annular cavity is formed between the outer wall of the rubber cylinder and the inner wall of the outer cylinder. The two seat bodies are connected by a fixing strip located within the annular cavity.

[0006] Preferably, an annular portion is formed on the inner wall of one end of the outer cylinder, and a first slot is formed on the annular portion. An end cap is detachably provided on the other end of the outer cylinder, and a second slot is formed on the back of the end cap. The two seats are respectively engaged in the first slot and the second slot.

[0007] Preferably, a sealing ring is provided in the first slot and the second slot respectively.

[0008] Preferably, the two ends of the fixing strip are bent to form a mating part, and the mating part is fixed to the base by a screw assembly.

[0009] Preferably, a first flange is formed at each end of the outer cylinder, and a second flange is formed on the end cap. The first flange and the second flange are fixed by a screw assembly.

[0010] Preferably, a third flange is formed at the end of the end cap away from the second flange, and an outlet pipe is connected to the third flange.

[0011] Beneficial Effects: This utility model provides a screw pump stator structure, which includes an outer cylinder and a stator assembly inside the outer cylinder. The stator assembly includes a rubber cylinder with seats engaged at both ends. An annular cavity is formed between the outer wall of the rubber cylinder and the inner wall of the outer cylinder. The two seats are connected by a fixing strip located within the annular cavity. The screw pump stator structure provided by this utility model differs from existing stator assemblies in that the internal rubber cylinder is fixed by seats at both ends, which are engaged within the outer cylinder. When replacing the rubber cylinder, the seats can be removed and the fixing strip can be disassembled, making the replacement of the rubber cylinder smoother and preventing it from being difficult to remove due to swelling or deformation.

[0012] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a structural diagram of the screw pump stator structure provided by this utility model;

[0015] Figure 2 This is an exploded view of the screw pump stator structure provided by this utility model;

[0016] Figure 3 This is a side view of the screw pump stator structure provided by this utility model;

[0017] Figure 4 yes Figure 3 A cross-sectional view along the AA direction.

[0018] Explanation of reference numerals in the attached figures

[0019] 1-Outer cylinder; 2-Seat body; 3-Sealing ring; 4-Rubber cylinder; 5-Third flange; 6-End cover; 7-Outlet pipe; 8-Fixing strip; 9-First flange; 10-Second flange. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0021] like Figure 1-4 As shown: This utility model provides a screw pump stator structure, which includes an outer cylinder 1, inside which a stator assembly is disposed. The stator assembly includes a rubber cylinder 4, with a seat 2 respectively engaging at both ends of the rubber cylinder 4. An annular cavity is formed between the outer wall of the rubber cylinder 4 and the inner wall of the outer cylinder 1. The two seats 2 are connected by a fixing strip 8 located within the annular cavity. The screw pump stator structure provided by this utility model differs from the stator assembly in the prior art. The internal rubber cylinder is fixed by the seats at both ends, which are engaged within the outer cylinder. When replacing the rubber cylinder, the seats are removed and the fixing strip is disassembled, making the replacement of the rubber cylinder smoother and preventing difficulty in removal due to swelling or deformation of the rubber cylinder.

[0022] In a preferred embodiment of this utility model, in order to effectively fix the seat body inside the outer cylinder, an annular portion is formed on the inner wall of one end of the outer cylinder 1, and a first groove is formed on the annular portion. An end cap 6 is detachably provided on the other end of the outer cylinder 1, and a second groove is formed on the back of the end cap 6. The two seat bodies 2 are respectively engaged in the first groove and the second groove. During disassembly, the end cap is removed, and then the inner seat body connecting rubber cylinder is pulled out for easy replacement.

[0023] In a preferred embodiment of this utility model, in order to increase the sealing between the first and second card slots and the base, sealing rings 3 are respectively provided in the first and second card slots.

[0024] In a preferred embodiment of this invention, in order to connect the two bases, the two ends of the fixing strip 8 are bent to form mating portions, which are fixed to the base 2 by screw assemblies. Multiple fixing strips can be used to increase the stability of the connection between the two bases.

[0025] In a preferred embodiment of this utility model, in order to facilitate the end cap being fixed on the outer cylinder and to facilitate the connection and fixation of the outer cylinder with the main body of the screw pump, a first flange portion 9 is formed at both ends of the outer cylinder 1, and a second flange portion 10 is formed on the end cap 6. The first flange portion 9 and the second flange portion 10 are fixed by a screw assembly.

[0026] In a preferred embodiment of the present invention, in order to facilitate the connection and fixation between the end cap and the outlet pipe, a third flange 5 is formed at the end of the end cap 6 away from the second flange 10, and the outlet pipe 7 is connected to the third flange 5.

[0027] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0028] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0029] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A screw pump stator structure, characterized by, The screw pump stator structure includes an outer cylinder (1), and a stator assembly is disposed inside the outer cylinder (1); The stator assembly includes a rubber cylinder (4), with a seat (2) engaged at both ends of the rubber cylinder (4). An annular cavity is formed between the outer wall of the rubber cylinder (4) and the inner wall of the outer cylinder (1). The two seats (2) are connected by a fixing strip (8), which is located inside the annular cavity.

2. The screw pump stator structure of claim 1, wherein An annular portion is formed on the inner wall of one end of the outer cylinder (1), and a first slot is formed on the annular portion. An end cap (6) is detachably provided on the other end of the outer cylinder (1), and a second slot is formed on the back of the end cap (6). The two seats (2) are respectively engaged in the first slot and the second slot.

3. The screw pump stator structure of claim 2, wherein, A sealing ring (3) is provided in the first slot and the second slot respectively.

4. The screw pump stator structure of claim 3, wherein, The two ends of the fixing strip (8) are bent to form a docking part, and the docking part is fixed to the base (2) by a screw assembly.

5. The screw pump stator structure according to claim 4, characterized in that, The outer cylinder (1) has a first flange (9) formed at both ends, and the end cap (6) has a second flange (10) formed on it. The first flange (9) and the second flange (10) are fixed by a screw assembly.

6. The screw pump stator structure according to claim 5, characterized in that, A third flange (5) is formed at one end of the end cap (6) away from the second flange (10), and an outlet pipe (7) is connected to the third flange (5).

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