Control ring structure and tubular turbine

Abstract

The utility model relates to a control ring structure and a tubular turbine. The control ring structure comprises an outer guide ring, a control ring, a pressing plate ring and a plurality of balls. The balls are in rolling contact with the first arc surface, the second arc surface, the third arc surface and the fourth arc surface, and the radiuses of the first arc surface, the second arc surface, the third arc surface and the fourth arc surface are all larger than the radius of the balls. Point contact between the balls and the raceway in the prior art is changed into surface contact between the balls and the first arc surface, the second arc surface, the third arc surface and the fourth arc surface, so that the contact stress between the balls and the raceway is greatly reduced; meanwhile, it can be guaranteed that the contact areas between the balls and the first arc surface, the second arc surface, the third arc surface and the fourth arc surface are small, the probability of abrasion of the roller path and the balls is greatly reduced, and therefore the probability that the control ring and the outer guide ring are dislocated and clamped is reduced, and reciprocating motion of the control ring is stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of tubular turbines, in particular to a control ring structure and a tubular turbine. Background Art

[0002] The water guide mechanism of bulb-type and shaft-type turbines is a conical structure, mainly composed of inner and outer guide rings, guide vanes, guide vane arms, spring connecting rods and control rings. The control ring is arranged outside the flange on the downstream side of the outer guide ring. Hundreds of balls are set in the raceway between the control ring and the outer guide ring to reduce the friction resistance when the control ring rotates. The dead weight of the control ring and the guide vane operating torque are both large, and the contact stress between the balls and the raceway is large. The balls or the tracks are very easy to wear during long-term operation, which will cause the control ring and the outer guide ring to be misaligned and stuck, causing the guide vane closing law to change. In severe cases, the unit cannot be shut down due to large water leakage from the guide vanes. After the control ring and the outer guide ring are misaligned, the guide vane relay is subjected to a change in force, and the piston cylinder and the piston seal are more easily damaged, causing an operating oil pollution accident. Utility Model Content

[0003] Based on this, it is necessary to provide a control ring structure and a tubular turbine that can make the reciprocating motion of the control ring more stable and reliable.

[0004] A control loop structure, comprising:

[0005] The outer guide ring has an outer ring with a rolling groove formed along the circumferential direction; the inner wall of the rolling groove includes a first rolling ball surface and a second rolling ball surface which are arranged opposite to each other; the first rolling ball surface and the second rolling ball surface are both connected to the opening edge of the rolling groove;

[0006] A control ring is mounted on the outer ring of the outer guide ring and has a third rolling surface at a position facing the rolling groove;

[0007] A pressure plate ring is installed on the side of the control ring and has a fourth rolling ball surface at a position facing the rolling groove; the side wall of the rolling groove, the third rolling ball surface and the fourth rolling ball surface are surrounded to form a rolling track;

[0008] A plurality of balls are arranged in the raceway;

[0009] Among them, the first rolling ball surface, the second rolling ball surface, the third rolling ball surface and the fourth rolling ball surface are respectively recessed inward to form a first arc surface, a second arc surface, a third arc surface and a fourth arc surface; the ball is in rolling contact with the first arc surface, the second arc surface, the third arc surface and the fourth arc surface respectively; the radii of the first arc surface, the second arc surface, the third arc surface and the fourth arc surface are all greater than the radius of the ball.

[0010] In one embodiment, the centers of the first arc surface, the second arc surface, the third arc surface and the fourth arc surface are all eccentrically arranged relative to the center of the ball.

[0011] In one of the embodiments, it also includes a connecting piece; a mounting hole is opened along the pressure plate ring; a connecting hole is opened at a position opposite to the mounting hole of the control ring; one end of the connecting piece is installed in the mounting hole, and the other end is connected to the connecting hole; in the direction of the central axis of the control ring, the distance between the control ring and the pressure plate ring is adjustable to adjust the size of the raceway.

[0012] In one of the embodiments, a threaded adjustment member is further included; an adjustment screw hole is provided on the control ring; one end of the threaded adjustment member is threadedly connected to the adjustment screw hole, and the other end abuts against the side of the control ring facing the adjustment screw hole.

[0013] In one embodiment, the adjusting screw holes are divided into two groups, and each group includes at least one adjusting screw hole; in the direction of the outer guide ring of the control ring carton, the mounting hole is located between the two groups of adjusting screw holes; the threaded adjustment parts are multiple and correspond one to one with the multiple adjusting screw holes; each of the threaded adjustment parts is screwed into the corresponding adjusting screw hole, and is abutted against the side of the control ring.

[0014] In one of the embodiments, an adjusting gasket is clamped between the control ring and the pressure plate ring; and the thickness of the adjusting gasket is adjustable.

[0015] In one of the embodiments, a mounting step connected to the third rolling ball surface is formed at a position relative to the control ring and the pressure plate; the mounting step has a first inner wall and a second inner wall connected to each other; the connecting hole is opened on the first inner wall; the outer cylindrical surface of the pressure plate ring is in slidable contact with the second inner wall; and the distance between the pressure plate ring and the first inner wall is adjustable.

[0016] In one embodiment, the mounting hole is a smooth hole, the connecting hole is a threaded hole, and the connecting piece is a threaded fastener; the screw of the threaded fastener passes through the mounting hole and is threadedly connected to the connecting hole, and the nut of the threaded fastener is pressed on the side of the pressure plate ring away from the connecting hole.

[0017] In one of the embodiments, an elastic sealing member arranged along the circumference of the outer guide ring is clamped between the outer guide ring and the control ring, and between the outer guide ring and the pressure plate ring.

[0018] A tubular turbine comprises the control ring structure as described above.

[0019] In the above-mentioned control ring structure and cross-flow turbine, the ball rolls in contact with the first arc surface, the second arc surface, the third arc surface and the fourth arc surface respectively, and the radii of the first arc surface, the second arc surface, the third arc surface and the fourth arc surface are all larger than the radius of the ball. The point contact between the ball and the raceway in the prior art is changed to surface contact between the ball and the first arc surface, the second arc surface, the third arc surface and the fourth arc surface respectively, which greatly reduces the contact stress between the ball and the raceway. At the same time, it can also ensure that the ball has a smaller contact area with the first arc surface, the second arc surface, the third arc surface and the fourth arc surface, which greatly reduces the probability of wear of the raceway and the ball, thereby reducing the probability of misalignment and jamming of the control ring and the outer guide ring, and making the reciprocating motion of the control ring more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the control ring in a preferred embodiment of the utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure of the outer guide ring in the control ring structure shown;

[0022] Figure 3 for Figure 1 A schematic diagram of the structure of the control loop in the control loop structure shown;

[0023] Figure 4 for Figure 1 A schematic diagram of the structure of the pressure plate ring in the control ring structure shown;

[0024] Figure 5 for Figure 1 A schematic diagram of the positional relationship between the centers of the first arc surface, the second arc surface, the third arc surface and the fourth arc surface in the control ring structure and the center of the ball.

[0025] Explanation of reference numerals: 100, control ring structure; 110, outer guide ring; 111, rolling groove; 1111, first rolling ball surface; 1112, second rolling ball surface; 1113, first arc surface; 1114, second arc surface; 120, control ring; 121, third rolling ball surface; 1211, third arc surface; 122, connecting hole; 123, mounting step; 1231, first inner wall; 1232, second inner wall; 130, pressure plate ring; 131, fourth rolling ball surface; 1311, fourth arc surface; 132, mounting hole; 133, adjusting screw hole; 140, ball; 150, raceway; 160, connecting piece; 170, threaded adjustment piece; 180, elastic sealing piece. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there can be an intermediate element. It is also understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or there can be one or more intermediate elements.

[0029] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[0030] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0031] Figure 1 The structure of the control ring structure in one embodiment of the utility model is shown. For the convenience of description, the accompanying drawings only show the structure related to the embodiment of the utility model.

[0032] See also Figure 1 The control ring structure 100 in the preferred embodiment of the present invention includes an outer guide ring 110 , a control ring 120 , a pressure plate ring 130 and a plurality of balls 140 .

[0033] Please also read Figure 2The outer ring of the outer guide ring 110 is formed with a rolling groove 111 along the circumferential direction. The inner wall of the rolling groove 111 includes a first rolling ball surface 1111 and a second rolling ball surface 1112 that are arranged opposite to each other. The first rolling ball surface 1111 and the second rolling ball surface 1112 are both connected to the opening edge of the rolling groove 111. The rolling groove 111 may be a V-shaped groove, a trapezoidal groove, etc. The first rolling ball surface 1111 and the second rolling ball surface 1112 are two opposite inner walls of the rolling groove 111, which are used to support the ball 140.

[0034] Please also read Figure 3 The control ring 120 is mounted on the outer ring of the outer guide ring 110 and has a third rolling surface 121 at a position facing the rolling groove 111. Specifically, the third rolling surface 121 is an inclined surface that is inclined relative to the central axis of the control ring 120.

[0035] Please also read Figure 4 The pressure plate ring 130 is installed on the side of the control ring 120 and has a fourth rolling surface 131 at a position facing the rolling groove 111. The side wall of the rolling groove 111, the third rolling surface 121 and the fourth rolling surface 131 surround and form a rolling track 150.

[0036] A plurality of balls 140 are disposed in the raceway 150 and are in rolling contact with the first arc surface 1113 , the second arc surface 1114 , the third arc surface 1211 and the fourth arc surface 1311 , respectively.

[0037] The first rolling ball surface 1111, the second rolling ball surface 1112, the third rolling ball surface 121 and the fourth rolling ball surface 131 are respectively recessed inward to form a first arc surface 1113, a second arc surface 1114, a third arc surface 1211 and a fourth arc surface 1311. The radii of the first arc surface 1113, the second arc surface 1114, the third arc surface 1211 and the fourth arc surface 1311 are all greater than the radius of the ball 140.

[0038] In the control ring structure 100 and the tubular turbine, the ball 140 is in rolling contact with the first arc surface 1113, the second arc surface 1114, the third arc surface 1211 and the fourth arc surface 1311, respectively, and the radii of the first arc surface 1113, the second arc surface 1114, the third arc surface 1211 and the fourth arc surface 1311 are all larger than the radius of the ball 140, and the point contact between the ball 140 and the raceway 150 in the prior art is changed to the ball 140 rolling contact with the first arc surface 1113, the second arc surface 1114, the third arc surface 1211 and the fourth arc surface 1311 respectively. The surface contact between the arc surface 1211 and the fourth arc surface 1311 greatly reduces the contact stress between the ball 140 and the raceway 150, while ensuring that the ball 140 has a smaller contact area with the first arc surface 1113, the second arc surface 1114, the third arc surface 1211 and the fourth arc surface 1311, thereby greatly reducing the probability of wear of the raceway 150 and the ball 140, thereby reducing the probability of misalignment and jamming between the control ring 120 and the outer guide ring 110, and making the reciprocating motion of the control ring 120 more stable and reliable.

[0039] Please also read Figure 5 In some embodiments, the centers of the first arc surface 1113 , the second arc surface 1114 , the third arc surface 1211 and the fourth arc surface 1311 are all eccentrically arranged relative to the center of the ball 140 .

[0040] That is, the line connecting the first arc surface 1113 and its center a, the line connecting the second arc surface 1114 and its center b, the line connecting the third arc surface 1211 and its center c, and the line connecting the fourth arc surface 1311 and its center d all pass through the center e of the ball 140, so that the relative motion trajectory of the first arc surface 1113, the second arc surface 1114, the third arc surface 1211, the fourth arc surface 1311 in the raceway 150 and the ball 140 is an adaptive structure of an eccentric circle, so that the reciprocating motion of the control ring 120 is more stable and reliable.

[0041] In some embodiments, the control ring structure 100 further includes a connector 160. A mounting hole 132 is provided along the pressure plate ring 130. A connecting hole 122 is provided at a position of the control ring 120 opposite to the mounting hole 132. One end of the connector 160 is installed in the mounting hole 132, and the other end is connected to the connecting hole 122. In the direction of the central axis of the control ring 120, the spacing between the control ring 120 and the pressure plate ring 130 is adjustable to adjust the size of the raceway 150. The connector 160 is installed in the mounting hole 132 and connected to the connecting hole 122 to achieve a detachable connection between the pressure plate ring 130 and the control ring 120.

[0042] Since the control ring 120 and the pressure plate are both annular thin-walled parts, they are deformed significantly after processing, and it is very likely that the size of the raceway 150 cannot be guaranteed. At the same time, during the long-term use of the raceway 150 and the ball 140, the spacing between the control ring 120 and the pressure plate ring 130 in the direction of the center axis of the control ring 120 is adjusted to ensure the dimensional accuracy of the raceway 150.

[0043] At the same time, after long-term use, the raceway 150, the ball 140, etc. will have some wear and tear to a greater or lesser extent. By adjusting the distance between the control ring 120 and the pressure plate ring 130 in the axial direction of the control ring 120, the size of the raceway 150 can be adaptively adjusted to ensure that the control ring 120 can continuously, stably and reliably reciprocate.

[0044] In one embodiment, the control ring structure 100 further includes a threaded adjustment member 170. The control ring 120 is provided with an adjustment screw hole 133. One end of the threaded adjustment member 170 is threadedly connected to the adjustment screw hole 133, and the other end abuts against the side of the control ring 120 facing the adjustment screw hole 133.

[0045] When the size of the raceway 150 in the axial direction of the control ring 120 needs to be adjusted, the distance between the control ring 120 and the pressure plate ring 130 can be adjusted by simply turning the threaded adjustment member 170 without removing the pressure plate ring 130 from the control ring 120, which is simple and convenient.

[0046] More specifically, there are two groups of adjusting screw holes 133, each group includes at least one adjusting screw hole 133. In the direction of the control ring 120 carton outer guide ring 110, the mounting hole 132 is located between the two groups of adjusting screw holes 133. There are a plurality of threaded adjusting members 170 corresponding to the plurality of adjusting screw holes 133. Each threaded adjusting member 170 is screwed to the corresponding adjusting screw hole 133, and each of them abuts against the side surface of the control ring 120.

[0047] When the size of the raceway 150 needs to be adjusted, the distance between the pressure plate ring 130 and the control ring 120 can be adjusted by twisting the two sets of threaded adjustment parts 170, so that the position of the pressure plate ring 130 on both sides of the connecting part 160 is the same as or very close to the distance between the control ring 120, thereby reducing the probability of the pressure plate ring 130 tilting relative to the control ring 120 after adjustment, improving the size adjustment effect of the raceway 150, and ensuring that after the distance between the pressure plate ring 130 and the control ring 120 is adjusted into place, the ball 140 can respectively make effective and sensitive rolling contact with the first curved surface, the second curved surface, the third curved surface and the fourth curved surface, and ensure that the contact stress is small.

[0048] Specifically, in another embodiment, an adjusting gasket (not shown) is clamped between the control ring 120 and the pressure plate ring 130. The thickness of the adjusting gasket is adjustable. Therefore, by adjusting the thickness of the adjusting gasket, the spacing between the control ring 120 and the pressure plate ring 130 (i.e., the size of the raceway 150 in the direction of the central axis of the control ring 120) can be adjusted. Therefore, the use of the adjusting gasket can adaptively adjust the size of the raceway 150. Among them, the adjusting gasket can be sleeved on the connecting member 160, or it can be located at other positions of the pressure plate ring 130, such as the position of the pressure plate ring 130 close to the raceway 150, the position away from the raceway 150, or the position between adjacent connecting holes 122.

[0049] More specifically, the adjustment method of the gasket thickness can be achieved in the following two ways: the first way is to adjust the gasket thickness by selecting adjustment gaskets of different thicknesses; the second way is that the adjustment gasket can be composed of at least one small gasket, and the adjustment gasket thickness can be adjusted by increasing or decreasing the number of small gaskets.

[0050] Further, in some embodiments, a mounting step 123 connected to the third rolling surface 121 is formed at a position where the control ring 120 and the pressure plate ring 130 are opposite. The mounting step 123 has a first inner wall 1231 and a second inner wall 1232 that are connected to each other. A connecting hole 122 is provided on the first inner wall 1231. The outer circumferential surface of the pressure plate ring 130 is in slidable contact with the second inner wall 1232. The spacing between the pressure plate ring 130 and the first inner wall 1231 is adjustable. Among them, the first inner wall 1231 is an annular plane facing the pressure plate ring 130, and the second inner wall 1232 is a surface that is perpendicular to the first inner wall 1231 and matches the outer edge surface of the pressure plate ring 130 away from the raceway 150.

[0051] The second inner wall 1232 is in slidable contact with the outer edge of the pressure plate ring 130 along the central axis of the control ring 120. When the size of the raceway 150 in the central axis of the control ring 120 needs to be adjusted, it is only necessary to adjust the spacing between the second inner wall 1232 and the pressure plate ring 130. During the entire spacing adjustment process, the pressure plate ring 130 slides on the first inner wall 1231, which ensures the connection stability of the pressure plate ring 130 on the control ring 120 and ensures that the pressure plate ring 130 can move smoothly and accurately during the spacing adjustment process, making the adjustment of the size of the raceway 150 more stable and reliable.

[0052] When the control ring structure 100 includes the threaded adjustment member 170 , one end of the threaded adjustment member 170 is threadedly connected to the adjustment screw hole 133 , and the other end thereof is abutted against the second inner wall 1232 .

[0053] Furthermore, in some embodiments, the mounting hole 132 is a plain hole, the connecting hole 122 is a threaded hole, and the connecting member 160 is a threaded fastener. The screw of the threaded fastener passes through the mounting hole 132 and is threadedly connected to the connecting hole 122, and the nut of the threaded fastener is pressed on the side of the pressure plate ring 130 away from the connecting hole 122.

[0054] In this way, during the installation of the pressure plate ring 130 and the adjustment of the size of the raceway 150, the threaded fastener is turned until the nut of the threaded fastener abuts against or loosens the side of the pressure plate ring 130 away from the connecting hole 122, and the installation hole 132 is set as a smooth hole, the connecting hole 122 is set as a threaded hole, and the connecting member 160 is set as a threaded fastener, so that the disassembly and assembly of the pressure plate ring 130 and the adjustment of the size of the raceway 150 are more convenient.

[0055] Of course, in the process of adjusting the size of the raceway 150, you only need to loosen the threaded fasteners, and then adjust the distance between the pressure plate ring 130 and the control ring 120 to a suitable position by changing the thickness of the gasket or turning the threaded adjustment member 170, and then tighten the threaded fasteners to achieve the adjustment of the size of the raceway 150, which is very simple and convenient.

[0056] In some embodiments, an elastic seal 180 disposed along the circumference of the outer guide ring 110 is sandwiched between the outer guide ring 110 and the control ring 120, and between the outer guide ring 110 and the pressure plate ring 130. In this way, the provision of the elastic seal 180 can improve the density performance between the outer guide ring 110 and the control ring 120 and the pressure plate ring 130, respectively, reduce the probability of lubricating oil leakage in the raceway 150, ensure that the ball 140 works in a good and reliable lubrication environment, and make the reciprocating motion of the control ring 120 more stable and reliable.

[0057] Based on the above inventive concept, the present application also provides a tubular turbine, comprising the control ring structure 100 as described above.

[0058] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A control loop structure, characterized in that: include: The outer guide ring has an outer ring with a rolling groove formed along the circumferential direction; the inner wall of the rolling groove includes a first rolling ball surface and a second rolling ball surface which are arranged opposite to each other; the first rolling ball surface and the second rolling ball surface are both connected to the opening edge of the rolling groove; A control ring is mounted on the outer ring of the outer guide ring and has a third rolling surface at a position facing the rolling groove; A pressure plate ring is installed on the side of the control ring and has a fourth rolling ball surface at a position facing the rolling groove; the side wall of the rolling groove, the third rolling ball surface and the fourth rolling ball surface are surrounded to form a rolling track; A plurality of balls are arranged in the raceway; Among them, the first rolling ball surface, the second rolling ball surface, the third rolling ball surface and the fourth rolling ball surface are respectively recessed inward to form a first arc surface, a second arc surface, a third arc surface and a fourth arc surface; the ball is in rolling contact with the first arc surface, the second arc surface, the third arc surface and the fourth arc surface respectively; the radii of the first arc surface, the second arc surface, the third arc surface and the fourth arc surface are all greater than the radius of the ball.

2. The control loop structure according to claim 1, characterized in that: The centers of the first arc surface, the second arc surface, the third arc surface and the fourth arc surface are all eccentrically arranged relative to the center of the ball.

3. The control loop structure according to claim 1, characterized in that: It also includes a connecting piece; a mounting hole is opened along the pressure plate ring; a connecting hole is opened at a position opposite to the mounting hole of the control ring; one end of the connecting piece is installed in the mounting hole, and the other end is connected to the connecting hole; in the direction of the central axis of the control ring, the distance between the control ring and the pressure plate ring is adjustable to adjust the size of the raceway.

4. The control loop structure according to claim 3, characterized in that: It also includes a threaded adjustment member; the control ring is provided with an adjustment screw hole; one end of the threaded adjustment member is threadedly connected to the adjustment screw hole, and the other end abuts against the side of the control ring facing the adjustment screw hole.

5. The control loop structure according to claim 4, characterized in that: There are two groups of adjusting screw holes, and each group includes at least one adjusting screw hole; in the direction of the outer guide ring of the control ring carton, the mounting hole is located between the two groups of adjusting screw holes; there are multiple threaded adjustment parts corresponding to the multiple adjusting screw holes one by one; each threaded adjustment part is screwed on the corresponding adjusting screw hole, and is abutted against the side of the control ring.

6. The control loop structure according to claim 3, characterized in that: An adjusting gasket is clamped between the control ring and the pressure plate ring; and the thickness of the adjusting gasket is adjustable.

7. The control loop structure according to claim 3, characterized in that: An installation step connected to the third rolling ball surface is formed at the position where the control ring and the pressure plate are opposite to each other; the installation step has a first inner wall and a second inner wall that are connected to each other; the connecting hole is opened on the first inner wall; the outer circular surface of the pressure plate ring is in slidable contact with the second inner wall; the distance between the pressure plate ring and the first inner wall is adjustable.

8. The control loop structure according to claim 3, characterized in that: The mounting hole is a smooth hole, the connecting hole is a threaded hole, and the connecting piece is a threaded fastener; the screw of the threaded fastener passes through the mounting hole and is threadedly connected to the connecting hole, and the nut of the threaded fastener is pressed on the side of the pressure plate ring away from the connecting hole.

9. The control loop structure according to claim 1, characterized in that: An elastic sealing member arranged along the circumference of the outer guide ring is clamped between the outer guide ring and the control ring, and between the outer guide ring and the pressure plate ring.

10. A tubular turbine, characterized in that: The invention comprises a control loop structure as claimed in any one of claims 1 to 9.

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