Method for repairing rotor of rotor pump

Abstract

The invention belongs to the field of rotor pumps, and particularly relates to a rotor pump rotor repairing method. Comprising the steps that S1, the rotor is immersed in heat conduction liquid, the abrasion position of the rotor is located above the liquid level of the heat conduction liquid, and the heat conduction liquid is used for conducting heat on the rotor; s2, surfacing is conducted on the abraded position of the rotor, so that a repairing layer is formed on the abraded position of the rotor; and S3, the repairing layer is polished, so that the surface of the repairing layer and the surface of the rotor are kept horizontal. The invention provides a method for repairing a rotor of a rotor pump, and aims to solve the problem of deformation of a key slot of the rotor when the rotor is repaired.

Description

Technical Field

[0001] The invention belongs to the field of rotor pumps, and in particular relates to a method for repairing a rotor of a rotor pump. Background Art

[0002] The rotor pump is a positive displacement rotary pump that changes the working volume through the relative movement between the rotor and the pump body, thereby increasing the energy of the liquid and achieving the suction and discharge of the liquid. The core component of the rotor pump is the rotor, which is usually made of metal materials. The rotor pump has many advantages, such as simple structure, stable operation, and easy maintenance. It is widely used in chemical, petroleum, water treatment, food, pharmaceutical and other industries to transport various liquids or compressed gases.

[0003] After a rotary pump has been used for a long time, the rotor of the rotary pump will often wear out. Figure 2 As shown. When the rotor pump of the rotor pump is worn, the gap between the rotor and the rotor pump housing increases, which leads to the normal operation of the rotor pump.

[0004] When the rotor pump is worn, in order to repair the rotor pump, the applicant first proposed to fill and repair the worn area by surfacing welding (this method has not been disclosed). However, when using the above repair method, the applicant found that the above repair method has some shortcomings, which are mainly reflected in that when using the surfacing method to weld and repair the worn area, the high temperature caused by welding will cause the keyway of the rotor to deform, and finally after the worn area of ​​the rotor is repaired, the keyway of the rotor is damaged, and the rotor still cannot be used normally. Summary of the invention

[0005] The invention provides a method for repairing a rotor of a rotor pump, which aims to solve the problem of deformation and damage of a rotor keyway during rotor repair.

[0006] In order to achieve the above object, the present invention provides a method for repairing a rotor pump rotor, comprising:

[0007] S1, immersing the rotor in a heat-conducting liquid, and positioning the worn portion of the rotor above the liquid surface of the heat-conducting liquid, wherein the heat-conducting liquid is used to conduct heat to the rotor;

[0008] S2, performing surfacing welding on the worn part of the rotor so as to form a repair layer on the worn part of the rotor;

[0009] S3, grinding the repair layer so that the surface of the repair layer is level with the surface of the rotor;

[0010] S4, inspect the rotor to determine whether the rotor is qualified.

[0011] In the present application, the rotor is repaired by welding. During the rotor welding repair process, the rotor is in a heat-conducting liquid, which can guide the temperature on the rotor, and the temperature of the rotor will not rise, thereby solving the problem of deformation and damage of the rotor keyway due to high temperature.

[0012] Preferably, in order to ensure that the temperature of the heat-conducting liquid does not exceed a threshold value during welding, in S1, the temperature of the heat-conducting liquid is 0°C to 40°C.

[0013] The temperature of the heat transfer liquid is set between 0°C and 40°C. Therefore, during welding, even if the temperature of the heat transfer liquid rises due to welding, the temperature of the heat transfer liquid will not exceed the threshold, thereby solving the problem of the rotor deformation caused by the excessive temperature of the heat transfer liquid.

[0014] Preferably, in order to achieve a better heat conduction effect, in S1, the heat conduction liquid is in a flowing state.

[0015] When the heat-conducting liquid is in a flowing state, firstly, the flow of the heat-conducting liquid can achieve a better heat dissipation effect; secondly, the heat-conducting liquid heated by welding is separated from the rotor due to the flow, thereby preventing the heat-conducting liquid from being heated for a long time.

[0016] Preferably, in order to improve the utilization rate of the heat-conducting liquid, the heat-conducting liquid is in a circulating flow state.

[0017] The heat transfer liquid in the circulation flow contacts the rotor multiple times through the circulation flow, so the utilization rate of the heat transfer liquid is higher. At the same time, compared with directly discharging the heat transfer liquid, it is helpful to avoid leakage of the heat transfer liquid.

[0018] Preferably, in order to ensure that the temperature of the rotor can be quickly absorbed by the heat-conducting liquid, in S1, the distance between the worn part of the rotor and the liquid surface of the heat-conducting liquid is 2 to 5 cm.

[0019] When welding the worn part of the rotor, the welding position is 2 to 5 cm away from the liquid surface of the heat transfer liquid. Therefore, compared with other height positions, the heat generated by welding can be quickly absorbed by the heat transfer liquid. At the same time, it can also avoid liquid splashing to the welding position and affecting the welding quality.

[0020] Preferably, in S2, argon arc welding is used to weld the rotor.

[0021] Argon arc welding has the effects of slow temperature rise and uniform welding. Therefore, when using argon arc welding for welding, the temperature on the rotor will not rise sharply, so it is more conducive to the heat transfer liquid to conduct away the heat on the rotor.

[0022] Preferably, in order to control the temperature during welding, the welding machine current is maintained at 80-100A during the welding process.

[0023] Preferably, in order to ensure the grinding efficiency and take into account the repair effect of the worn part, in S1, the thickness of the repair layer does not exceed 2 mm.

[0024] When the thickness of the repair layer does not exceed 2mm, the grinding time is shorter and the efficiency is higher. In addition, since the depth of the worn part of the rotor usually does not exceed 2mm, a 2mm thick repair layer can also ensure that the rotor can achieve the repair effect.

[0025] Preferably, in S4, a control method is used to detect the rotor.

[0026] When the rotor is inspected by the comparison method, no specialized instruments are required, and the maintenance cost and operation difficulty are low. Secondly, the comparison method can quickly determine whether the rotor is suitable for repair, which is more efficient.

[0027] The beneficial effect of the present invention is that the rotor is repaired by welding in the present application. During the rotor welding repair process, the rotor is in a heat-conducting liquid, which can guide the temperature on the rotor, and the temperature of the rotor will not rise, thereby solving the problem of deformation and damage of the keyway of the rotor due to high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Flow chart of the rotor repair method.

[0029] Figure 2 This is a schematic diagram of the rotor structure.

[0030] Figure 3 Schematic diagram of the rotor being repaired in the water tank.

[0031] Figure 4 This is a schematic diagram of the rotor during inspection.

[0032] Figure 5 Schematic diagram of repair when the temperature of the heat transfer liquid is different.

[0033] The reference numerals include: rotor 1 , wear area 11 , keyway 12 , water box 2 , inlet 21 , outlet 22 . DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are only examples of devices and methods consistent with some aspects of the present disclosure as detailed in the attached claims.

[0035] It should be noted that all actions to obtain signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where they are located, and with the authorization given by the owner of the corresponding device.

[0036] In the present disclosure, unless otherwise stated, the directional words used, such as "inside" and "outside", are defined according to the corresponding parts' own contours. The terms used in the present disclosure, such as "first" and "second", etc., are used to distinguish one element from another element and do not have order and importance.

[0037] Example 1

[0038] Basically as attached Figure 1 As shown, a method for repairing a rotor of a rotor pump is mainly intended to solve the problem in the prior art that when the rotor 1 is repaired, the temperature of the rotor 1 is too high, causing the keyway 12 of the rotor 1 to deform and the rotor 1 to be damaged.

[0039] The repair method provided in the embodiment of the present disclosure mainly includes the following steps:

[0040] S1, immersing the rotor 1 in a heat-conducting liquid, and positioning the worn portion 11 of the rotor 1 above the liquid surface of the heat-conducting liquid. The heat-conducting liquid is used to conduct heat to the rotor 1.

[0041] The heat-conducting liquid used in the embodiments of the present disclosure is preferably tap water. Tap water has a strong heat dissipation effect, is low in cost, and is easy to obtain. Of course, it should be noted that: in order to ensure a better heat-conducting effect, in some other embodiments, the heat-conducting liquid can also be set to a heat-conducting oil with a better heat-conducting effect.

[0042] At the same time, in order to achieve a better heat conduction effect, the heat conduction liquid is contained in the water tank 2 in the embodiment of the present disclosure. Figure 3As shown, the water tank 2 is provided with an inlet 21 and an outlet 22. The external heat-conducting liquid flows into the water tank 2 from the inlet 21, and the heat-conducting liquid inside the water tank 2 flows out from the outlet 22 to the outside of the water tank 2. During the flow of the heat-conducting liquid, the heat-conducting liquid can conduct the heat on the rotor 1 more quickly, further solving the problem of the temperature increase of the rotor 1. In addition, in order to avoid waste and leakage of the heat-conducting liquid, a reflux pump can be provided at the outlet of the water tank 2. The outlet of the reflux pump is in a connected state with the inlet 21 of the water tank 2. By providing a reflux pump, the liquid discharged from the water tank 2 can be refluxed into the water tank 2, thereby improving the utilization rate of the heat-conducting liquid and avoiding leakage of the heat-conducting liquid.

[0043] In the embodiment of the present disclosure, the temperature of the heat transfer liquid is 40° C. Therefore, when the temperature of the rotor 1 is transferred to the heat transfer liquid, the temperature of the heat transfer liquid will not exceed a threshold value (usually 45° C.), thereby preventing the rotor 1 from being in a high temperature environment for a long time and deforming.

[0044] In order to ensure that the temperature of the heat-conducting liquid does not exceed 40°C before the operation, a temperature detection device can be set in the water tank 2 in the embodiment of the present disclosure. Before the welding operation, the temperature of the heat-conducting liquid in the water tank 2 is detected by the temperature detection device. When the temperature detection device detects that the temperature of the heat-conducting liquid is between 40°C, the operator can perform the welding operation; when the temperature of the heat-conducting liquid exceeds 40°C, the operator can stop the welding operation. The temperature detection device can be a conventional temperature detector in the prior art.

[0045] In the disclosed embodiment, when the rotor 1 is immersed in the heat-conducting liquid, the distance between the worn part 11 of the rotor 1 and the liquid surface of the heat-conducting liquid is 2 to 5 cm. When the distance between the worn part 11 and the liquid surface of the heat-conducting liquid is less than 2 cm, the heat-conducting liquid may splash onto the welding position, and the liquid is easy to contact the repair layer, which may cause the risk of repair failure; when the distance between the worn part 11 and the liquid surface of the heat-conducting liquid exceeds 5 cm, the temperature of the rotor 1 cannot be quickly transferred to the heat-conducting liquid, which may cause the risk of the rotor 1 overheating.

[0046] S2, performing build-up welding on the worn portion 11 of the rotor 1 so that a repair layer is formed on the worn portion 11 of the rotor 1.

[0047] In the disclosed embodiment, argon arc welding is used to build up the worn area 11 of the rotor 1. Argon arc welding has the characteristics of slow temperature rise and uniform welding. Therefore, when argon arc welding is used for welding, the repair layer formed on the worn area 11 of the rotor 1 is more uniform. And because the temperature rises slowly, the temperature on the rotor 1 can be absorbed by the heat-conducting liquid in time, and the temperature of the rotor 1 is too high, causing the keyway to deform. At the same time, when using argon arc welding to build up the worn area 11 of the rotor 1, it is preferable to control the welding machine current to be maintained at 80 to 100A. When the current exceeds 100A, it will directly lead to excessively high temperature at the welding point, and the probability of deformation on the surface of the rotor 1 will increase. At the same time, the problem of uneven heating is also prone to occur.

[0048] In the disclosed embodiment, the thickness of the repair layer formed by welding at the worn portion 11 of the rotor 1 does not exceed 2 mm. A repair layer with a thickness exceeding 2 mm is not convenient for subsequent grinding, while a repair layer with a thickness below 2 mm may cause repair failure as the repair layer cannot fill the worn portion 11.

[0049] S3, after the welding is completed, the rotor 1 can be taken out from the heat-conducting liquid, or the rotor 1 can continue to be contained in the heat-conducting liquid.

[0050] Then, the repair layer formed at the welding position is polished by manual polishing. The polishing process can reduce the thickness of the repair layer until the surface of the repair layer is level with the surface of the rotor 1 .

[0051] It is understandable that the embodiment of the present disclosure uses manual grinding, but obviously, in some other embodiments, a machine can also be used for grinding.

[0052] S4, inspect the rotor 1 to determine whether the rotor 1 is qualified.

[0053] In the embodiment of the present disclosure, it is preferred to use a comparison method to determine whether the rotor 1 is qualified. The so-called comparison method is: Figure 4 As shown, when detecting the secondary shaft rotor 1, a brand new rotor pump secondary shaft rotor 1 is used to mesh with the repaired secondary shaft rotor 1, and then the gap error between the two is measured. If the error is within the specified range, it means that the repair is completed. If the error is not within the specified range, it needs to be repaired again. When detecting the main shaft rotor 1, a brand new rotor pump secondary shaft rotor 1 is used to mesh with the repaired main shaft rotor 1, and then the gap error between the two is measured. If the error is within the specified range, it means that the repair is completed. If the error is not within the specified range, it needs to be repaired again.

[0054] It should be noted that: the embodiment of the present disclosure provides a method of using a comparison method to detect the rotor 1, but there are many methods for detecting the rotor 1 in the prior art. Therefore, in some other embodiments, other methods can be used to detect the rotor 1.

[0055] Example 2

[0056] The difference between this embodiment and embodiment 1 is that the temperature of the heat-conducting liquid in this embodiment is 35° C. The other steps and conditions are exactly the same as those in embodiment 1.

[0057] Comparative Example 1

[0058] The difference between this comparative example and Example 1 is that the temperature of the heat-conducting liquid in this comparative example is 45° C. The other steps and conditions are exactly the same as those in Example 1.

[0059] The temperature values ​​of the rotor surface during the operation of Example 1, Comparative Example 2 and Comparative Example 3 were collected by a temperature detector in turn, and the following table was obtained by statistics.

[0060]

[0061] It can be seen from the above table:

[0062] When the temperature of the heat-conducting liquid is lower than 40 degrees Celsius before welding (Examples 1 and 2), the temperature of the heat-conducting liquid during welding will not exceed 45 degrees Celsius. The heat-conducting liquid at a temperature lower than 45 degrees Celsius will not cause the rotor to deform.

[0063] When the temperature of the heat-conducting liquid exceeds 40 degrees Celsius before welding (Comparative Example 1), the temperature of the heat-conducting liquid during welding will not exceed 45 degrees Celsius. The heat-conducting liquid below 45 degrees Celsius will not cause the rotor to deform.

[0064] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for repairing a rotor pump rotor, Features: The following steps are included: S1, immersing the rotor in a heat-conducting liquid, and positioning the worn portion of the rotor above the liquid surface of the heat-conducting liquid, wherein the heat-conducting liquid is used to conduct heat to the rotor; S2, performing surfacing welding on the worn part of the rotor so as to form a repair layer on the worn part of the rotor; S3, grinding the repair layer so that the surface of the repair layer is level with the surface of the rotor; S4, inspect the rotor.

2. The method for repairing a rotor pump rotor according to claim 1, Features: In S1, the temperature of the heat-conducting liquid is 0°C to 40°C.

3. The method for repairing a rotor pump rotor according to claim 1 or 2, Features: In S1, the heat-conducting liquid is in a flowing state.

4. The method for repairing a rotor pump rotor according to claim 3, Features: The heat-conducting liquid is in a circulating flow state.

5. The method for repairing a rotor pump rotor according to claim 1, Features: In S1, the distance between the worn part of the rotor and the liquid surface of the heat-conducting liquid is 2 to 5 cm.

6. The method for repairing a rotor pump rotor according to claim 1, Features: In S2, argon arc welding is used to weld the rotor.

7. The method for repairing a rotor pump rotor according to claim 6, Features: During welding, the welding machine current is maintained at 80-100A.

8. The method for repairing a rotor pump rotor according to claim 1, Features: In S1, the thickness of the repair layer does not exceed 2 mm.

9. The method for repairing a rotor pump rotor according to claim 1, Features: In S4, the rotor is tested by a control method.

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