Stationary blade adjusting mechanism in small turbine

Abstract

The utility model relates to the technical field of small turbines, in particular to a stationary blade adjusting mechanism in a small turbine, which is characterized in that a plurality of rotating sleeves are uniformly and annularly arranged on the outer end surface of a cylinder; the adjustable stationary blades are evenly arranged on the inner side of the air cylinder in a surrounding mode, and the blade root ends of the adjustable stationary blades penetrate through the air cylinder and are fixedly connected with the rotating sleeve. The adjusting ring is rotatably arranged on the outer wall of the air cylinder in a sleeving mode. The end, not connected with the blade root end of the adjustable stationary blade, of the rotating sleeve is connected with the adjusting ring in a relatively rotating mode. The control assembly comprises a rolling piece and a traction piece, the rolling piece is rotatably arranged on a support of the air cylinder, the traction piece is rotatably connected with the rolling piece, and the end, not connected with the rolling piece, of the traction piece is rotatably connected with the adjusting ring. A roller lever in the control assembly rotates positively and negatively to drive an adjusting ring to rotate positively and negatively, so that adjustable stationary blades fixedly connected with the adjusting ring through a rotating sleeve can rotate positively and negatively to adjust the mounting angle matched with current saturated steam parameters, and the operation efficiency of a unit is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to small -size turbine technical field especially, relates to a static vane adjusting mechanism in small -size turbine. BACKGROUND

[0002] In each industrial field in our country, the waste heat resource of not fully utilized in the process usually exists, and the saturated steam is a kind of more common one. Since the saturated steam is low in grade and small in flow, the common utilization mode is to enter the small -size turbine and expand to work. The existing saturated steam turbine adopts the through-flow scheme of one-stage static vane plus one-stage dynamic vane, can effectively reduce the volume of unit and realizes quick start and stop.

[0003] Since the saturated steam is generated by the upstream process, the parameter is not a fixed value, and is uncontrollable. This requires the turbine to operate under different inlet steam parameters, and in order to adapt to the change of inlet steam flow, the turbine usually has two adjusting modes, one is valve adjustment, and the other is nozzle adjustment. But there are the following problems: when the turbine adjusts the inlet steam flow by changing the valve opening, the 100% valve opening condition corresponds to the maximum flow condition. When the inlet steam flow is less than the maximum flow, the valve opening is less than 100%, the throttling loss increases, the ideal enthalpy drop of the turbine decreases, and the work efficiency of the unit decreases. When the turbine adjusts the inlet steam flow by nozzle, the full circumferential inlet steam condition corresponds to the maximum flow condition. When the inlet steam flow is less than the maximum flow, the nozzle is partially inlets steam, and the efficiency is low. And the temperature difference of each part of the steam chamber where the nozzle is located is large, the thermal stress deformation is large, which is not conducive to the safe operation of the unit.

[0004] Therefore, whether it is valve adjustment or nozzle adjustment, the expander is most efficient only when it works at the design point of through-flow. When any parameter (including temperature, pressure, flow) of the saturated steam changes and deviates from the design point, the efficiency will decrease, so the existing small turbine needs a mechanism that can adjust the installation angle of the static vane when the parameters of the saturated steam change. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the shortcomings in the prior art, and provides a static vane adjusting mechanism in small -size turbine, which comprises:

[0006] The cylinder is uniformly provided with a plurality of rotating sleeves on the outer end face;

[0007] The adjustable static vane is uniformly arranged on the inner side of the cylinder, and the root end of the adjustable static vane penetrates the cylinder and is fixedly connected with the rotating sleeve;

[0008] The adjusting ring is rotatably arranged on the outer wall of the cylinder, and the end of the rotating sleeve, which is not connected with the root end of the adjustable static vane, is rotatably connected with the adjusting ring;

[0009] The control assembly comprises a rolling member rotatably arranged on a support of the cylinder and a traction member rotatably connected with the rolling member, and one end of the traction member not connected with the rolling member is rotatably connected with the adjusting ring.

[0010] Further, the blade root end of the adjustable vane comprises a tightening surface and a threaded structure arranged outside the tightening surface, and the threaded structure is fixedly connected with the cylinder through a nut.

[0011] Further, a sealing gasket is arranged between the inner wall of each rotating sleeve and the outer wall of the cylinder, and the sealing gasket is sleeved on the outer wall of the blade root end of the adjustable vane.

[0012] Further, a plurality of accommodating cavities are arranged on one side of the adjusting ring facing the rotating sleeve, the number of the accommodating cavities is the same as the number of the rotating sleeves, and one end of the rotating sleeve not connected with the blade root end of the adjustable vane is arranged in the accommodating cavity.

[0013] Further, a screw is arranged on the adjusting ring, the screw penetrates through the upper end surface of the adjusting ring, the rotating sleeve and the lower end surface of the adjusting ring, and a first tripod is arranged on the outer wall of the adjusting ring.

[0014] Further, the rolling member is a rolling lever, the rolling lever is connected with an actuating mechanism, and a second tripod is arranged on the outer wall of the rolling lever.

[0015] Further, the traction member is a pull rod, and the two ends of the pull rod are rotatably connected with the first tripod and the second tripod through rotating shafts.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1. The adjustable vane adjusting mechanism in the small-sized turbine comprises the rotating sleeve connected with the adjustable vane, the other end of the rotating sleeve is connected with the adjusting ring, the adjusting ring is connected with the control assembly rotatably arranged on the outer wall of the cylinder, the rolling lever in the control assembly is reversely rotated to drive the adjusting ring to reversely rotate, and then the adjustable vane fixedly connected with the rotating sleeve and the adjusting ring can be reversely rotated to adjust the installation angle matched with the current saturated steam parameter, so that the operation efficiency of the unit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings provide illustration of the utility model and are part of the specification. Together with the embodiments of the utility model, the drawings serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

[0019] Fig. 1 It is a structure schematic view of the vane adjusting mechanism in the small-sized turbine of the utility model;

[0020] Fig. 2 It is a sectional view of the vane adjusting mechanism in the small-sized turbine of the utility model.

[0021] Reference signs

[0022] 1: cylinder; 2: rotating sleeve; 3: adjustable vane; 4: adjusting ring; 5: sealing gasket; 6: nut; 7: screw; 8: drum lever; 9: pull rod; 10: moving vane. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the utility model will be further explained in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0024] In order to make the drawing simple, only the parts related to the application are schematically shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the components with the same structure or function is schematically shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0025] First embodiment

[0026] Please refer to Figs. 1-2 The technical scheme of the vane adjusting mechanism in the small-sized turbine provided by the embodiment comprises:

[0027] The cylinder 1 is uniformly provided with a plurality of rotating sleeves 2 on the outer end surface;

[0028] The adjustable vanes 3 are uniformly arranged on the inner side of the cylinder 1, and the root end of the adjustable vane 3 penetrates the cylinder 1 and is fixedly connected with the rotating sleeve 2;

[0029] The adjusting ring 4 is rotatably arranged on the outer wall of the cylinder 1, and the end of the rotating sleeve 2 not connected with the root end of the adjustable vane 3 is rotatably connected with the adjusting ring 4;

[0030] The control assembly comprises a rolling member rotatably arranged on the support of the cylinder 1 and a traction member rotatably connected with the rolling member, and the end of the traction member not connected with the rolling member is rotatably connected with the adjusting ring 4.

[0031] In the specific implementation, the cylinder 1 is provided with a plurality of through holes for the blade root end of the adjustable vane 3 to pass through, and the blade root end of the adjustable vane 3 comprises a tightening surface and a threaded structure arranged outside the tightening surface, the threaded structure is fixedly connected with the cylinder 1 through a nut 6 after passing through the cylinder 1, and the rotating sleeve 2 is tightly attached to the tightening surface after the nut 6 is tightened, so as to ensure that the rotating sleeve 2 can drive the blade to rotate when rotating. In order to further ensure the sealing performance between the rotating sleeve 2 and the cylinder 1, a sealing gasket 5 is further arranged on the outer wall of the blade root end of the adjustable vane 3, and the sealing gasket 5 is arranged between the inner wall of the rotating sleeve 2 and the outer wall of the cylinder 1 to play a sealing role.

[0032] Specifically, the adjusting ring 4 is provided with a plurality of accommodating cavities on the side facing the rotating sleeve 2, the number of the accommodating cavities is the same as the number of the rotating sleeve 2, and the end of the rotating sleeve 2, which is not connected with the blade root end of the adjustable vane 3 (for the sake of understanding, it is called a rotating end), is arranged in the accommodating cavity. The rotating end is rotatably connected with the adjusting ring 4 through a screw 7, the screw 7 passes through the upper end surface of the adjusting ring 4, the rotating sleeve 2 and the lower end surface of the adjusting ring 4, and the rotating end can relatively rotate around the part of the screw 7 located in the accommodating cavity.

[0033] Preferably, the specific shape of the accommodating cavity is not limited in the application, and the shape of the rotating end is not limited either. The circular rotating end in the drawing is only used as an illustration, and other reasonable shapes of the rotating end are within the protection scope of the application.

[0034] Specifically, the rolling member is a roller lever 8, the roller lever 8 is connected with an executing mechanism, and under the driving of the executing mechanism, the roller lever 8 can rotate around its own axis (the bracket limits the axial and radial movement of the roller lever 8).

[0035] Specifically, the traction member is a pull rod 9, in order to realize the connection, a first tripod is arranged on the outer wall of the adjusting ring 4, and a second tripod is arranged on the outer wall of the roller lever 8, the two ends of the pull rod 9 are rotatably connected with the first tripod and the second tripod through rotating shafts, and the specific rotatable connection mode is not limited. Taking the first tripod as an example, a U-shaped groove is arranged at the end of the tripod, the end of the pull rod 9 is arranged in the U-shaped groove, and the rotating shaft passes through the side wall of the U-shaped groove and the end of the pull rod 9, and other reasonable rotatable connection modes can be used in the application.

[0036] In addition, when the steam admission parameter changes, the size of the stator blade installation angle is adjusted through the logical curve of the steam admission parameter and the stator blade installation angle, the throughflow area is changed by changing the stator blade installation angle, the full circumference steam admission of the turbine is ensured, the energy loss caused by the partial steam admission is reduced, the efficiency is improved, and the thermal stress deformation caused by the temperature unevenness is reduced.

[0037] The working principle or working process of the stator blade adjusting mechanism in the small turbine provided by the utility model is as follows: an actuator (such as a forward and reverse motor) drives the rotation of the drum lever 8, the drum lever 8 drives the rotation of the adjusting ring 4 through the pull rod 9; and the adjusting ring 4 drives the rotation of the rotating sleeve 2 to drive the rotation of the adjustable stator blade 3 fixedly connected with the rotating sleeve 2, so that the adjustment of the stator blade installation angle is completed.

[0038] Finally, it should be pointed out that: the above is only the preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical scheme recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A stator vane adjustment mechanism in a small turbine, characterized in that, include: A cylinder, wherein a plurality of rotating sleeves are evenly arranged around the outer end face of the cylinder; Adjustable stationary vanes, a plurality of such adjustable stationary vanes are evenly arranged in a ring around the inside of the cylinder, and the root end of the adjustable stationary vanes passes through the cylinder and is fixedly connected to the rotating sleeve; An adjusting ring is rotatably sleeved on the outer wall of the cylinder, and the end of the rotating sleeve that is not connected to the root end of the adjustable stationary vane is rotatably connected to the adjusting ring. The control assembly includes a rolling element rotatably mounted on a bracket on the cylinder and a traction element rotatably connected to the rolling element, wherein one end of the traction element not connected to the rolling element is rotatably connected to the adjusting ring.

2. The stator vane adjustment mechanism in the small turbine according to claim 1, characterized in that: The root end of the adjustable stationary vane includes a tightening surface and a threaded structure located on the outside of the tightening surface. The threaded structure passes through the cylinder and is fixedly connected to the cylinder by a nut.

3. The stator vane adjustment mechanism in the small turbine according to claim 1, characterized in that: A sealing gasket is provided between the inner wall of each rotating sleeve and the outer wall of the cylinder, and the sealing gasket is sleeved on the outer wall of the root end of the adjustable stationary vane.

4. The stator vane adjustment mechanism in the small turbine according to claim 1, characterized in that: The adjusting ring has several receiving cavities on the side facing the rotating sleeve. The number of receiving cavities is the same as the number of rotating sleeves. The end of the rotating sleeve that is not connected to the root end of the adjustable stationary blade is located in one of the receiving cavities.

5. The stator vane adjustment mechanism in the small turbine according to claim 4, characterized in that: The adjusting ring is provided with a screw, which passes through the upper end face of the adjusting ring, the rotating sleeve and the lower end face of the adjusting ring; the outer wall of the adjusting ring is provided with a first tripod.

6. The stator vane adjustment mechanism in the small turbine according to claim 5, characterized in that: The rolling element is a roller lever, which is connected to the actuator; the outer wall of the roller lever is provided with a second tripod.

7. The stator vane adjustment mechanism in a small turbine according to claim 6, characterized in that: The traction component is a pull rod, and the two ends of the pull rod are rotatably connected to the first tripod and the second tripod via a rotating shaft.

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