Stator inner diameter detection device

Abstract

The utility model provides a stator inner diameter detection device, which relates to the technical field of stator detection tools, and comprises a cylindrical axial rod and a detection assembly fixed at one end of the axial rod, the detection assembly comprises a fixed rod and threaded rods respectively arranged at two ends of the fixed rod, and the axial rod is vertically fixed in the middle of the fixed rod. The ends of the two threaded rods are in threaded connection with abutting pieces respectively. The device has the advantages that the inner diameter of the stator can be quickly detected, and the assembly clearance of the screw pump can be conveniently controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of stator inspection tools, in particular to a stator inner diameter inspection device. Background Art

[0002] The single screw pump is a rotor type positive displacement pump, which relies on the meshing of the screw and the bushing to produce volume changes in the suction chamber and the discharge chamber to transport liquid. It is an internally meshed closed screw pump, and the main working parts are composed of a bushing (stator) with a double-headed spiral cavity and a single-headed spiral screw (rotor) meshed with it in the stator cavity. When the input shaft drives the rotor to make planetary rotation around the center of the stator through the universal joint, the stator-rotor pair continuously meshes to form a sealed cavity, and these sealed cavities move axially at a uniform speed without changing the volume, transporting the conveying medium from the suction end to the discharge end through the stator-rotor pair, and the medium sucked into the closed cavity flows through the stator without being stirred or damaged.

[0003] In the existing related technologies, due to the processing errors in the manufacturing process of the stator and rotor of the screw pump, there is a certain tolerance value after the stator and the rotor are assembled. The size of the tolerance value has a great influence on the transmission efficiency and wear of the screw pump. Since the inner cavity of the stator is a spiral special-shaped structure, it is not convenient to detect it, and the tolerance clearance of the assembled screw pump cannot be controlled. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides a stator inner diameter detection device, which solves the problem that it is inconvenient to detect whether the inner diameter of the stator inner cavity meets the fitting requirements, thereby affecting the fitting tolerance of the assembled screw pump.

[0005] According to an embodiment of the utility model, a stator inner diameter detection device includes a cylindrical axial rod and a detection assembly fixed at one end thereof, the detection assembly includes a fixed rod and threaded rods respectively arranged at both ends of the fixed rod, the axial rod is vertically fixed in the middle of the fixed rod, and abutments are respectively threadedly connected at the ends of the two threaded rods.

[0006] Through the above technical scheme, when detecting the inner diameter of the stator of the screw pump, the abutments at both ends of the fixed rod are rotated respectively so that the distance between the ends of the two abutments that are away from each other is the same as the inner diameter of the stator to be detected. The detection personnel then hold the axial rod to place the detection component horizontally inside the stator to be detected, and move along the length direction of the axial rod to sense whether the detection component is stuck during the movement. If not, it means that the stator detection is qualified, otherwise it is unqualified. The device can quickly complete the detection of the inner diameter of the stator, which is convenient for controlling the assembly clearance of the screw pump.

[0007] Preferably, the abutment is a cylindrical member, one end of which is provided with a threaded blind hole adapted to the threaded rod, and the other end of which is provided with an abutment portion abutting against the inner wall of the screw pump stator, and the abutment portion is a hemispherical structure.

[0008] Through the above technical solution, the abutting end of the hemispherical structure can reduce the resistance between the abutting part and the inner wall of the stator when the abutting part moves, making the perception of the inspector more accurate, improving the inspection results of the stator processing accuracy, and increasing the practicality of the device.

[0009] Preferably, a positioning nut is threadedly connected to the threaded rod, and the positioning nut is used to position the abutment to prevent the abutment from being displaced.

[0010] Through the above technical solution, after adjusting the distance between the two abutments, the abutments can be locked using the positioning nut to prevent the possibility of the abutments loosening or moving during the detection process and affecting the detection results, thereby further improving the reliability of the device.

[0011] Preferably, a positioning piece is slidably mounted on the axial rod, and the positioning piece is used to locate the relative position between the axial rod and the stator of the screw pump.

[0012] Through the above technical solution, when the detection device is moved along the length direction of the axial rod, the positioning piece can be used to improve the coaxiality between the axial rod and the stator outer circle, preventing the possibility of the axial rod offset in the vertical plane affecting the detection result.

[0013] Preferably, the positioning member is a disc-shaped component, the axial rod is coaxially and slidably mounted on the positioning member, and a circular ring-shaped limiting flange is formed on the side of the positioning member facing the detection component, and the inner diameter of the limiting flange is the same as the outer diameter of the screw pump stator.

[0014] Through the above technical solution, the limiting flange can be used to further improve the coaxiality between the positioning member and the stator, and further facilitate the positioning of the axial rod.

[0015] Preferably, a guide cylinder is coaxially fixed on the positioning member, the inner hole diameter of the guide cylinder is the same as the outer diameter of the axial rod, and the axial rod is slidably installed in the guide cylinder.

[0016] Through the above technical solution, the guide cylinder can be used to further position the axial rod, further reduce the gap jump of the axial rod during movement, further increase its coaxiality during movement, and thus improve the reliability of the detection result.

[0017] Preferably, a limiting member is detachably mounted on one end of the axial rod away from the detection assembly, and the limiting member is used to prevent the axial rod from being separated from the positioning member.

[0018] Through the above technical scheme, when the axial rod moves, the limit member can be used to prevent the axial rod from being separated from the positioning member. The detachable structure can facilitate the installation and removal of the detection device, and facilitate the adjustment of the distance between the two abutment members, thereby improving the practicality of the device.

[0019] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0020] 1. When testing the inner diameter of the screw pump stator, rotate the abutment pieces at both ends of the fixed rod respectively so that the distance between the ends of the two abutment pieces that are far away from each other is the same as the inner diameter of the stator to be tested. The tester then holds the axial rod and places the test assembly horizontally inside the stator to be tested, and moves along the length direction of the axial rod to sense whether the test assembly is stuck during the movement. If not, it means that the stator test is qualified, otherwise it is unqualified. The device can quickly complete the test of the stator inner diameter, which is convenient for controlling the assembly clearance of the screw pump;

[0021] 2. The hemispherical abutment end can reduce the resistance between the abutment part and the inner wall of the stator when the abutment part moves, making the detection personnel's perception more accurate, improving the detection results of the stator processing accuracy, and increasing the practicality of the device;

[0022] 3. The axial rod can be further positioned by using positioning pieces and guide cylinders, further reducing the clearance jump of the axial rod during movement, further increasing its coaxiality during movement, and thus improving the reliability of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of this application;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective;

[0025] Figure 3 for Figure 1 Schematic diagram of the local structure.

[0026] In the above drawings:

[0027] 1. Axial rod;

[0028] 2. Detection assembly; 21. Fixed rod; 22. Threaded rod; 23. Abutment member; 231. Abutment portion; 24. Positioning nut;

[0029] 3. Positioning piece; 31. Limiting flange; 32. Guide cylinder; 33. Limiting piece. DETAILED DESCRIPTION

[0030] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0031] A stator inner diameter detection device, referring to Figure 1-Figure 3 , including a cylindrical axial rod 1 and a detection assembly 2 fixed at one end thereof, the axial rod 1 is a cylindrical component, and is made of stainless steel; the detection assembly 2 includes a fixed rod 21 and threaded rods 22 respectively arranged at both ends of the fixed rod 21, the axial rod 1 is vertically fixed in the middle of the fixed rod 21, and abutments 23 are respectively threadedly connected at the ends of the two threaded rods 22.

[0032] The abutment 23 is a cylindrical component, and a threaded blind hole matching the threaded rod 22 is provided at one end of the abutment 23. The threaded blind hole and the abutment 23 are made coaxially, and an abutment portion 231 abutting against the inner wall of the stator of the screw pump is provided at the other end of the abutment 23. The abutment portion 231 is a hemispherical structure. The hemispherical structure of the abutment portion 231 can reduce the friction area with the inner wall of the stator, thereby improving the perception result of the inspector during the inspection.

[0033] A positioning nut 24 is also threadedly connected to the threaded rod 22 , and the positioning nut 24 is used to position the abutment 23 to prevent the abutment 23 from being displaced.

[0034] A positioning member 3 is also slidably mounted on the axial rod 1 . The positioning member 3 can be made of a steel plate and is used to locate the relative position between the axial rod 1 and the stator of the screw pump.

[0035] The positioning member 3 is a disc-shaped component, and the axial rod 1 is coaxially and slidably installed on the positioning member 3. A circular ring-shaped limiting flange 31 is formed on the side of the positioning member 3 facing the detection component 2. The limiting flange 31 is a circular ring-shaped component with a rectangular cross-section. The inner diameter of the limiting flange 31 is the same as the outer diameter of the screw pump stator.

[0036] A guide cylinder 32 is coaxially fixed on the positioning member 3 . The inner diameter of the guide cylinder 32 is the same as the outer diameter of the axial rod 1 . The axial rod 1 is slidably installed in the guide cylinder 32 .

[0037] A limit member 33 is detachably mounted on one end of the axial rod 1 away from the detection assembly 2 . The limit member 33 is made of a nut and is threadedly connected to the end of the axial rod 1 . The limit member 33 is used to prevent the axial rod 1 from being separated from the positioning member 3 .

[0038] The implementation principle of a stator inner diameter detection device in the present application is:

[0039] When detecting the inner diameter of the stator of the screw pump, the abutments 23 at both ends of the fixed rod 21 are rotated respectively so that the distance between the ends of the two abutments 23 that are away from each other is the same as the inner diameter of the stator to be detected, and the positioning nut 24 is rotated with a wrench or other tool to tighten the abutments 23 to prevent the abutments 23 from moving; the inspector then holds the axial rod 1 to place the inspection component 2 horizontally inside the stator to be inspected, inserts the axial rod 1 into the guide cylinder 32 of the positioning component 3, and installs the limiter 33 on the axial rod 1, and installs the positioning component 3 at one end of the stator so that the limiter flange 31 is clamped on the outer cylindrical surface of the stator, and moves along the length direction of the axial rod 1 to sense whether the inspection component 2 is stuck during the movement. If not, it means that the stator inspection is qualified, otherwise it is unqualified; the device can quickly complete the inspection of the inner diameter of the stator, which is convenient for controlling the assembly clearance of the screw pump.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A stator inner diameter detection device, characterized in that: The invention comprises a cylindrical axial rod (1) and a detection assembly (2) fixed at one end thereof, wherein the detection assembly (2) comprises a fixed rod (21) and threaded rods (22) respectively arranged at both ends of the fixed rod (21), the axial rod (1) is vertically fixed to the middle of the fixed rod (21), and abutment members (23) are respectively threadedly connected at the ends of the two threaded rods (22).

2. A stator inner diameter detection device according to claim 1, characterized in that: The abutment member (23) is a cylindrical member, one end of which is provided with a threaded blind hole adapted to the threaded rod (22), and the other end of which is provided with an abutment portion (231) abutting against the inner wall of the screw pump stator, wherein the abutment portion (231) is a hemispherical structure.

3. A stator inner diameter detection device according to claim 2, characterized in that: The threaded rod (22) is also threadedly connected with a positioning nut (24), and the positioning nut (24) is used to position the abutment member (23) to prevent the abutment member (23) from being displaced.

4. A stator inner diameter detection device according to claim 1, characterized in that: A positioning member (3) is also slidably mounted on the axial rod (1), and the positioning member (3) is used to locate the relative position between the axial rod (1) and the stator of the screw pump.

5. A stator inner diameter detection device according to claim 4, characterized in that: The positioning member (3) is a disc-shaped component. The axial rod (1) is coaxially and slidably mounted on the positioning member (3). A circular ring-shaped limiting flange (31) is formed on the side of the positioning member (3) facing the detection component (2). The inner diameter of the limiting flange (31) is the same as the outer diameter of the screw pump stator.

6. A stator inner diameter detection device according to claim 5, characterized in that: A guide cylinder (32) is coaxially fixed on the positioning member (3); the inner diameter of the guide cylinder (32) is the same as the outer diameter of the axial rod (1); and the axial rod (1) is slidably mounted in the guide cylinder (32).

7. A stator inner diameter detection device according to claim 4, characterized in that: A limiting member (33) is detachably mounted on one end of the axial rod (1) away from the detection assembly (2), and the limiting member (33) is used to prevent the axial rod (1) from being separated from the positioning member (3).

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