Volume flow monitoring device for last-stage blade of steam turbine

Abstract

The utility model provides a steam turbine last-stage blade volume flow monitoring device, which belongs to the field of monitoring devices and comprises a base, four positioning blocks are fixedly connected to the upper end face of the base and are in one-to-one correspondence, a supporting frame is mounted on the upper end face of the base and is positioned between two pairs of positioning blocks, and the positioning blocks are arranged on the upper end face of the base. The supporting frame is fixedly connected with a shell, the shell is communicated with an air inlet pipe and an air outlet pipe, a movable and static blade set is installed in the shell, and a limiting assembly is installed on the base. The limiting block is matched with the limiting plate, the supporting frame is limited and fixed, the situation that the monitoring result is affected by displacement of the shell in the monitoring process is avoided, meanwhile, the gas flow rate in the gas outlet detection pipe and the gas inlet monitoring pipe is monitored through the gas flow meter, and the volume flow of the tail end of the moving and static blade set can be calculated. The detection process is simple and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of monitoring devices, in particular to a volume flow monitoring device for the last-stage blades of a steam turbine. Background Art

[0002] A steam turbine is a rotary steam-powered device, also known as a steam turbine engine. It uses high-temperature and high-pressure steam to pass through a fixed nozzle to become an accelerated airflow and then spray it onto the blades, causing the rotor equipped with blade rows to rotate and perform external work at the same time. The last-stage blades of the steam turbine are the blades of the last compression stage or expansion stage of the steam turbine and are an important part of the steam turbine performance.

[0003] During the turbine design process, in order to ensure smooth airflow on the blade surface, it is necessary to monitor the changes in airflow parameters generated when the last-stage blades are working, so as to adjust the flow angle of the blades in a timely manner. Currently, when monitoring the volume flow of the last-stage blades of the turbine, the fluid flow velocity is usually used to simulate and calculate the volume flow. However, the existing detection device is cumbersome to install, resulting in a large workload for the staff. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a device for monitoring the volume flow of the last-stage blades of a steam turbine.

[0005] The embodiment of the utility model provides a device for monitoring the volume flow of a last-stage blade of a steam turbine, comprising:

[0006] A base, wherein the upper end surface of the base is fixedly connected to four positioning blocks, the four positioning blocks correspond to each other one by one, a support frame is installed on the upper end surface of the base, the support frame is located between two pairs of positioning blocks, a shell is fixedly connected to the support frame, an air inlet pipe and an air outlet pipe are connected to the shell, a moving and stationary blade group is installed in the shell, and a limit assembly is installed on the base;

[0007] Monitoring component; the monitoring component includes two hydraulic mechanical arms, on which an air inlet detection tube and an air outlet detection tube are fixedly installed respectively, and a gas flow meter is fixedly installed on the air inlet detection tube and the air outlet detection tube.

[0008] Furthermore, the limit assembly includes a limit plate fixedly connected to the upper end face of the base, a sliding cavity is opened in the base, a threaded rod is rotatably connected to the inner wall of the sliding cavity, a sliding plate is slidably connected in the sliding cavity, the threaded rod threads through the sliding plate, a group of sliding openings are opened on the inner wall of the sliding cavity, a group of limit blocks are fixedly connected to the upper end face of the sliding plate, a group of the limit blocks slide in a group of sliding openings respectively, a servo motor is fixedly installed on the side wall of the base, and the rotating end of the servo motor rotates through the base and is fixedly connected to the threaded rod.

[0009] Furthermore, a group of feet are fixedly connected to the lower end surface of the base.

[0010] Furthermore, a protective shell is fixedly connected to the side wall of the base, the protective shell matches the servo motor, and a group of heat dissipation holes is provided on the protective shell.

[0011] Furthermore, the inner wall of the shell is configured to be conical.

[0012] Furthermore, the limiting plate and the limiting block are both provided with anti-slip patterns.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The user places the support frame between two pairs of positioning blocks, and then the servo motor starts working to move the limit block. The limit block cooperates with the limit plate to achieve the limit fixation of the support frame, making the housing more stable during the detection process.

[0015] 2. After the support frame is fixed, the hydraulic mechanical arm starts to work, and the air inlet detection tube and the air outlet detection tube can be attached to the air inlet pipe and the air outlet pipe respectively. Then, the air fluid is introduced into the air inlet detection tube. The gas flow meter can monitor the gas flow rate and calculate the volume flow rate at the end of the dynamic and static blade group. The detection process is simple and easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural stereoscopic schematic diagram of a steam turbine last-stage blade volume flow monitoring device described in an embodiment of the present utility model.

[0017] Figure 2 It is a three-dimensional side view of the structure of a volume flow monitoring device for the last stage blade of a steam turbine described in an embodiment of the present utility model.

[0018] Figure 3 It is a three-dimensional cross-sectional view of a steam turbine last-stage blade volume flow monitoring device described in an embodiment of the present utility model.

[0019] In the above drawings: 1 base, 2 positioning block, 3 support frame, 4 outer shell, 5 dynamic and static blade group, 6 hydraulic mechanical arm, 7 air inlet detection tube, 8 air outlet detection tube, 9 gas flow meter, 10 limit plate, 11 sliding cavity, 12 threaded rod, 13 sliding plate, 14 limit block, 15 servo motor, 16 pad, 17 protective shell. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1-Figure 3As shown, the embodiment of the present invention provides a device for monitoring the volume flow of the last-stage blades of a steam turbine, comprising:

[0022] The support frame 3 is fixedly connected to the upper end surface of the base 1, and two lifting rings are fixedly connected to the side walls of the support frame 3. The support frame 3 can be lifted up by using a lifting mechanism and the lifting rings. The support frame 3 is located between the two pairs of positioning blocks 2. The support frame 3 is fixedly connected to the outer shell 4. The inner wall of the outer shell 4 is conical. The air inlet pipe and the air outlet pipe are connected to the outer shell 4. The dynamic and static blade group 5 is installed in the outer shell 4. The dynamic and static blade group 5 is the existing technology and is mainly composed of three parts: blade root, blade profile and blade top. The blade root ensures that the blade is firmly fixed on the impeller under operating conditions. The blade profile is the working part of the blade, which constitutes the steam flow channel. The blade top is the part above the blade profile. According to the different blade groups, its structure is also different. It will not be described here. A limited position component is installed on the base 1;

[0023] Monitoring component; The monitoring component includes two hydraulic mechanical arms 6. The hydraulic mechanical arm 6 is the existing technology and is composed of a hydraulic cylinder and a cylinder. It can drive the air inlet detection tube 7 and the air outlet detection tube 8 to move in the horizontal and vertical directions. No more details are given here. The two hydraulic mechanical arms 6 are respectively fixedly installed with the air inlet detection tube 7 and the air outlet detection tube 8. The air inlet detection tube 7 and the air outlet detection tube 8 are fixedly installed with a gas flow meter 9. The gas flow meter 9 is the existing technology. Its main function is to measure the gas flow rate and record the amount of gas flowing through. It is widely used in the measurement of various gases. No more details are given here. The limit assembly includes a limit plate 10 fixedly connected to the upper end face of the base 1. A sliding cavity 11 is opened in the base 1. The inner wall of the sliding cavity 11 is rotatably connected to a threaded rod 12. A sliding plate 13 is slidably connected to the sliding cavity 11. The threaded rod 12 threads through the sliding plate 13, and a group of sliding openings are opened on the inner wall of the sliding cavity 11;

[0024] A group of limit blocks 14 are fixedly connected to the upper end surface of the sliding plate 13, and a group of limit blocks 14 slide in a group of sliding openings respectively. A servo motor 15 is fixedly installed on the side wall of the base 1. The rotating end of the servo motor 15 rotates through the base 1 and is fixedly connected to the threaded rod 12. A protective shell 17 is fixedly connected to the side wall of the base 1. The protective shell 17 matches the servo motor 15. A group of heat dissipation holes is provided on the protective shell 17. The protective shell 17 can protect the servo motor 15 and prevent the servo motor 15 from being damaged by external interference. Anti-slip textures are provided on the limit plate 10 and the limit block 14, which improves the friction between the limit plate 10, the limit block 14 and the support frame 3, and improves the stability of the support frame 3.

[0025] The detailed working process of this utility model is as follows:

[0026] First, the user places the base 1 in the specified position, and then the user uses the lifting mechanism to make the support frame 3 be located between the two pairs of positioning blocks 2, and then the servo motor 15 starts to work, and the rotating end of the servo motor 15 drives the threaded rod 12 to start rotating, and the sliding plate 13 located in the sliding cavity 11 starts to slide, which can make the limit block 14 slide in the sliding mouth, and the limit block 14 approaches the limit plate 10. The limit block 14 cooperates with the limit plate 10 to achieve the limit fixation of the support frame 3, so that during the detection process, the shell 4 is more stable, and the displacement of the shell 4 during the monitoring process is avoided to affect the monitoring results. After the support frame 3 is fixed, the hydraulic mechanical arm 6 starts to work, and the air inlet detection tube 7 and the air outlet detection tube 8 can be respectively attached to the air inlet pipe and the air outlet pipe on the shell 4, and then the air fluid is introduced into the air inlet detection tube 7. The gas flow meter 9 can monitor the gas flow rate, and the gas flow rate in the air outlet detection tube 8 can be monitored, and the volume flow at the end of the dynamic and static blade group 5 can be calculated. The detection process is simple and the operation is portable.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this 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 steam turbine last stage blade volume flow monitoring device, characterized in that: include: A base (1), wherein the upper end surface of the base (1) is fixedly connected to four positioning blocks (2), the four positioning blocks (2) are in one-to-one correspondence, a support frame (3) is installed on the upper end surface of the base (1), the support frame (3) is located between two pairs of positioning blocks (2), a shell (4) is fixedly connected to the support frame (3), an air inlet pipe and an air outlet pipe are connected to the shell (4), a moving and stationary blade group (5) is installed in the shell (4), and a limit assembly is installed on the base (1); Monitoring assembly; the monitoring assembly comprises two hydraulic mechanical arms (6), an air intake detection tube (7) and an air outlet detection tube (8) being fixedly mounted on the two hydraulic mechanical arms (6), and a gas flow meter (9) being fixedly mounted on both the air intake detection tube (7) and the air outlet detection tube (8).

2. A steam turbine last stage blade volume flow monitoring device according to claim 1, characterized in that: in: The limiting assembly includes a limiting plate (10) fixedly connected to the upper end surface of the base (1), a sliding cavity (11) is opened in the base (1), a threaded rod (12) is rotatably connected to the inner wall of the sliding cavity (11), a sliding plate (13) is slidably connected in the sliding cavity (11), the threaded rod (12) threadedly penetrates the sliding plate (13), a group of sliding openings is opened in the inner wall of the sliding cavity (11), a group of limiting blocks (14) are fixedly connected to the upper end surface of the sliding plate (13), a group of limiting blocks (14) slide in a group of sliding openings respectively, a servo motor (15) is fixedly installed on the side wall of the base (1), and the rotating end of the servo motor (15) rotates through the base (1) and is fixedly connected to the threaded rod (12).

3. The device for monitoring the volume flow of the last stage blade of a steam turbine according to claim 1, characterized in that: in: A set of feet (16) is fixedly connected to the lower end surface of the base (1).

4. A steam turbine last stage blade volume flow monitoring device according to claim 2, characterized in that: in: A protective shell (17) is fixedly connected to the side wall of the base (1), the protective shell (17) matches the servo motor (15), and a group of heat dissipation holes are provided on the protective shell (17).

5. The device for monitoring the volume flow of the last stage blade of a steam turbine according to claim 1, characterized in that: in: The inner wall of the outer shell (4) is arranged in a conical shape.

6. A steam turbine last stage blade volume flow monitoring device according to claim 2, characterized in that: in: The limiting plate (10) and the limiting block (14) are both provided with anti-slip patterns.

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