Mounting structure for piston rod and piston of hydroelectric power station servomotor

Abstract

The utility model provides an installation structure of a hydroelectric power station servomotor piston rod and a piston. The installation structure comprises a cylinder sleeve and a piston rod. A first end cover and a second end cover are arranged at the two ends of the cylinder sleeve respectively. The piston rod is of an integral structure, a first shaft section connected with the first end cover in a sliding and sealing mode and a second shaft section connected with the second end cover in a sliding and sealing mode are arranged on the piston rod, a third shaft section is arranged between the first shaft section and the second shaft section, and a flange is arranged between the second shaft section and the third shaft section. A locking mechanism is arranged between the first shaft section and the third shaft section, a piston arranged on the outer side of the third shaft section in a sleeving mode is installed between the first shaft section and the flange through the locking mechanism, and the piston is connected with the inner wall of the cylinder sleeve in a sliding and sealing mode. The servomotor piston rod is designed to be of an integral structure, on one hand, the fault hidden danger caused by loosening of a two-section type piston rod connected through a thread pair in the prior art is avoided, and meanwhile, installation and maintenance of the integral structure are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic turbine servomotors, in particular to an installation structure of a piston rod and a piston of a hydraulic turbine servomotor. Background Technique

[0002] The piston rod of a certain type of hydraulic turbine servomotor adopts a two-section split piston rod. The piston rod includes a piston rod section I and a piston rod section II. After the piston of the servomotor is installed into the piston rod section II at the operating end, the internal threaded end of the piston rod section I and the external threaded end of the piston rod section II are screwed together to form a threaded pair connection, as shown in Figure 4 , and then a hole is drilled in the piston, and two clamping blocks are used to clamp the piston rod section I to prevent the piston rod from loosening during operation. The two-section piston rod uses threaded connection. Since the piston rod is heavy, horizontal installation is very likely to cause thread biting. Vertical installation has certain requirements for the site and tooling and increases the workload. Attention should also be paid to exhaust during the process of screwing the thread. The anti-loosening clamping blocks can only be made according to the position after the two-section piston rod is screwed, and the position needs to be re-matched every time of disassembly and assembly. The disassembly and assembly of the two-section piston rod have high requirements for the site and operators.

[0003] During the long-term operation of the servomotor, due to the vibration of the unit and the huge pushing and pulling forces generated during the operation of the servomotor, the thread connection of the servomotor rod will become loose, resulting in tremors during the operation of the servomotor, affecting the smooth operation of the unit system. Seriously, due to the loosening of the thread, the front and rear piston rods are not on the same axis. Due to the large self-weight of the piston, after a long time, there will be a phenomenon of abrasion between the piston and the cylinder block or the servomotor cannot work normally. Moreover, the threaded connection of the segmented piston rod is inside the servomotor cylinder and is not visible to the naked eye. When the connection is loose, it is not easy to find. When a fault occurs, it is necessary to disassemble components such as the servomotor and the connecting rod, and pull out the piston rod to find out the problem, consuming a lot of manpower and material resources, and irreversible damage has been caused to the piston rod and the servomotor at this time. Content of the Utility Model

[0004] The purpose of the utility model is to provide an installation structure of a piston rod and a piston of a hydraulic turbine servomotor. By designing the piston rod of the servomotor as an integral structure, on the one hand, it avoids the potential faults caused by the loosening of the two-section piston rod connected by a threaded pair in the prior art, and at the same time, it is also convenient for the installation and maintenance of the integral structure. In order to achieve the above technical features, the purpose of the utility model is realized as follows:

[0005] An installation structure of a piston rod and a piston of a hydraulic turbine servomotor includes a cylinder sleeve and a piston rod;

[0006] The two ends of the cylinder sleeve are respectively provided with a first end cover and a second end cover;

[0007] The piston rod has an integral structure. A first shaft section that is slidably and sealingly connected to the first end cover and a second shaft section that is slidably and sealingly connected to the second end cover are provided on the piston rod. A third shaft section is provided between the first shaft section and the second shaft section. A flange is provided between the second shaft section and the third shaft section. A locking mechanism is provided between the first shaft section and the third shaft section. A piston sleeved outside the third shaft section is installed between the first shaft section and the flange through the locking mechanism. The piston is slidably and sealingly connected to the inner wall of the cylinder sleeve.

[0008] An annular groove is provided between the first shaft section and the third shaft section. The locking mechanism includes a snap ring that is sleeved on the annular groove and has a split structure. A retaining ring is sleeved outside the snap ring. The retaining ring is fixedly connected to the piston.

[0009] A seal is provided between the third shaft section and the piston.

[0010] The utility model has the following beneficial effects:

[0011] 1. By designing the piston rod of the servomotor as an integral structure, on the one hand, it avoids the potential faults caused by the loosening of the two-section piston rod connected by a thread pair in the prior art, and at the same time, it is convenient for the installation and maintenance of the overall structure;

[0012] 2. The installation and positioning of the piston on the third shaft section are completed through the cooperation of the split snap ring installed in the annular groove and the flange. Subsequently, the retaining ring is sleeved outside the snap ring, that is, the snap ring is fixed and limited. Through the setting of the above structure, the stable connection between the piston and the piston rod is realized, and at the same time, the connection structure is simple and convenient for installation and disassembly. Description of the Drawings

[0013] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0014] Figure 1 is a schematic diagram of the installation structure of a piston rod and a piston of a hydropower station servomotor provided by an embodiment of the present utility model;

[0015] Figure 2 is an external view of the piston rod provided by an embodiment of the present utility model;

[0016] Figure 3 is a schematic diagram of the structure of the snap ring provided by an embodiment of the present utility model;

[0017] Figure 4 is a schematic diagram of the installation structure of a piston rod and a piston in the prior art involved in the present utility model;

[0018] In the figure: cylinder liner 1, piston rod 2, first shaft section 2a, second shaft section 2b, third shaft section 2c, flange 2d, annular groove 2e, first end cover 3, second end cover 4, piston 5, snap ring 6, retaining ring 7, locking block 8, piston rod section I 21, piston rod section II 22, screw pair 23. Detailed implementation mode

[0019] The following further describes the implementation mode of the present utility model in conjunction with the accompanying drawings.

[0020] See the attached Figures 1-3 , in order to achieve the above technical features, the object of the present utility model is realized as follows:

[0021] An installation structure of a servomotor piston rod and a piston in a hydropower station, comprising a cylinder liner 1 and a piston rod 2; first end cover 3 and second end cover 4 are respectively arranged at both ends of the cylinder liner 1; the piston rod 2 is of an integral structure, and the piston rod 2 is provided with a first shaft section 2a slidably and sealingly connected to the first end cover 3 and a second shaft section 2b slidably and sealingly connected to the second end cover 4. A third shaft section 2c is arranged between the first shaft section 2a and the second shaft section 2b, a flange 2d is arranged between the second shaft section 2b and the third shaft section 2c, and a locking mechanism is arranged between the first shaft section 2a and the third shaft section 2c. The piston 5 sleeved outside the third shaft section 2c is installed between the first shaft section 2a and the flange 2d through the locking mechanism, and the piston 5 is slidably and sealingly connected to the inner wall of the cylinder liner 1. By designing the servomotor piston rod as an integral structure in this application, on the one hand, it avoids the potential faults caused by the loosening of the two-section piston rod connected by a screw pair in the prior art, has high piston installation accuracy, and is also convenient for the installation and maintenance of the overall structure.

[0022] Furthermore, an annular groove 2e is arranged between the first shaft section 2a and the third shaft section 2c. The locking mechanism includes a snap ring 6 sleeved on the annular groove 2e and having a split structure. A retaining ring 7 is sleeved outside the snap ring 6, and the retaining ring 7 is fixedly connected to the piston 5; the installation and positioning of the piston 5 on the third shaft section 2c are completed through the cooperation of the split snap ring 6 installed in the annular groove 2e and the flange 2d. Subsequently, the retaining ring 7 is sleeved outside the snap ring 6, that is, the snap ring 6 is fixed and limited. Through the setting of the above structure, the stable connection between the piston 5 and the piston rod 2 is realized, and at the same time, the connection structure is simple and convenient for installation and disassembly.

[0023] Furthermore, a sealing member is arranged between the third shaft section 2c and the piston 5 to prevent leakage.

Claims

1. A mounting structure for a piston rod and a piston of a hydropower station servomotor, characterized in that: It comprises a cylinder sleeve (1) and a piston rod (2); The two ends of the cylinder sleeve (1) are respectively provided with a first end cover (3) and a second end cover (4); The piston rod (2) is an integral structure. The piston rod (2) is provided with a first shaft section (2a) which is slidably sealed with the first end cover (3) and a second shaft section (2b) which is slidably sealed with the second end cover (4). A third shaft section (2c) is provided between the first shaft section (2a) and the second shaft section (2b). A flange (2d) is provided between the second shaft section (2b) and the third shaft section (2c). A locking mechanism is provided between the first shaft section (2a) and the third shaft section (2c). A piston (5) sleeved on the outside of the third shaft section (2c) is installed between the first shaft section (2a) and the flange (2d) through the locking mechanism. The piston (5) is slidably sealed with the inner wall of the cylinder sleeve (1).

2. The installation structure of the piston rod and piston of a hydropower station servomotor according to claim 1, characterized in that: An annular groove (2e) is provided between the first shaft section (2a) and the third shaft section (2c); the locking mechanism comprises a snap ring (6) which is sleeved on the annular groove (2e) and has a split structure; a retaining ring (7) is sleeved on the outer side of the snap ring (6); and the retaining ring (7) is fixedly connected to the piston (5).

3. The installation structure of the piston rod and piston of a hydropower station servomotor according to claim 2 is characterized by: A sealing member is provided between the third shaft section (2c) and the piston (5).

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