A turbine volute with adjustable tongue length and angle

Abstract

The present invention discloses a turbine volute with adjustable tongue length and angle, comprising a volute shell, a tongue, a tongue adjusting member and a latch; the tongue comprises a tongue seat and a rotating tongue; the tongue seat is placed in the tongue seat mounting groove of the volute shell and penetrates into the inner cavity of the volute shell; the volute shell is fixed with latch rings at both sides of the tongue seat mounting groove, and a limit ring is fixed on the outer side of a latch ring; the limit ring is provided with a notch; more than three limit protrusions arranged equidistantly are fixed on the tongue seat; the side wall of the latch is provided with an integrally formed clamping strip; the latch passes through the gap between the limit ring, two latch rings and two of the limit protrusions on the tongue seat, and the clamping strip on the latch is placed between the limit ring and the latch ring close to the limit ring; the clamping strip and the notch of the limit ring are arranged in a staggered manner. The present invention extends the tongue length and adjusts the tongue angle at small and medium flow rates to maximize the turbine efficiency; appropriately shortens the tongue length at large flow rates to ensure stable operation of the turbine and extend the life of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic turbines, in particular to a turbine volute with adjustable baffle length and angle. Background Art

[0002] Fernandez et al. conducted a numerical study on the radial force of PAT (centrifugal pump as turbine) through steady-state and unsteady-state simulations. They found that the radial force increases linearly with the increase of flow rate, and the interaction between the volute baffles and the blades plays a key role in the radial force. Hamed Alemi Arani et al. found that extending the baffle length or changing the baffle angle can increase the turbine output power relatively and improve the turbine efficiency. At high flow rates, medium-length baffles can be used to significantly reduce the radial force. Further increasing the length of the baffle has no significant effect on the radial force. Baffles with medium angles can improve efficiency and output power at the highest level; at low flow rates, larger baffle angles can improve efficiency. Therefore, modifying the baffle length and angle according to the flow rate can obtain better radial force and efficiency.

[0003] However, the length and angle of the baffle tongue of the existing turbine volute are generally fixed, and are determined when the volute is cast. To change the length and angle of the baffle tongue, the volute must be replaced, which is both expensive and time-consuming. Summary of the invention

[0004] The object of the present invention is to provide a turbine volute with adjustable baffle length and angle to address the deficiencies of the prior art, thereby avoiding the need to manufacture a volute separately to accommodate different flow rates.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] The present invention includes a volute housing, a partition tongue, a tongue adjusting member and a latch. The partition tongue includes a tongue seat and a rotating tongue; the mounting shaft integrally formed at the tail of the rotating tongue and the two bosses integrally formed at the head of the tongue seat both constitute a rotating pair; the tongue adjusting member includes a driven bevel gear, a driving bevel gear, a rotating shaft and a pressure plate; the driving bevel gear and the driven bevel gear are both placed between the two bosses; the driven bevel gear is fixed on the mounting shaft; the driving bevel gear is fixed at the head of the rotating shaft and meshes with the driven bevel gear; the rotating shaft and the center hole of the tongue seat constitute a rotating pair; the pressure plate contacts the positioning shaft section integrally formed at the tail end of the rotating shaft; the pressure plate is provided with n through holes uniformly distributed along the circumferential direction, n≥2; the end surface position of the tongue seat facing the pressure plate is provided with n threaded holes uniformly distributed along the circumferential direction; each through hole of the pressure plate is connected to a threaded hole corresponding to the tongue seat by screws. A tongue seat mounting groove is provided on one of the side surfaces of the volute shell; the tongue seat is placed in the tongue seat mounting groove, and penetrates into the inner cavity of the volute shell through the notch provided in the volute shell; the volute shell is fixed with latch rings at both sides of the tongue seat mounting groove, and a limit ring is fixed on the outside of one of the latch rings; the lowest positions of the inner walls of the latch ring and the limit ring are higher than the side surface of the volute shell with the tongue seat mounting groove; the limit ring is provided with a notch; and three or more limit protrusions arranged equidistantly are fixed on the tongue seat. An integrally formed clamping strip is provided on the side wall of the latch pin; the latch pin passes through the gap between the limit ring, two latch rings and two of the limit protrusions on the tongue seat, and the clamping strip on the latch pin is placed between the limit ring and the latch ring close to the limit ring; the clamping strip and the notch of the limit ring are arranged in a staggered manner.

[0007] Preferably, the base circle diameter of the volute housing is 170-175 mm.

[0008] More preferably, the number of the upper limit protrusions of the tongue seat is 8, and the distance between adjacent limit protrusions is 2 mm.

[0009] More preferably, the length of the latch is 18 mm, and the diameter is equal to the distance between adjacent limiting protrusions on the tongue seat.

[0010] Preferably, a pointer is provided on the end face of the positioning shaft section of the rotating shaft, and a scale is provided on the tongue seat at the outer edge of the positioning shaft section.

[0011] The beneficial effects of the present invention are as follows:

[0012] The present invention removes the original fixed baffle tongue portion of the volute casing, and installs a special baffle tongue with manually adjustable length and angle on the original baffle tongue portion. In small and medium flow conditions, the length of the baffle tongue is extended and the angle of the baffle tongue is adjusted to maximize the turbine efficiency. In large flow conditions, in order to reduce its radial force, the length of the baffle tongue is appropriately shortened to ensure stable operation of the turbine and extend the life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 for Figure 1 A partial enlarged view of part A;

[0015] Figure 3 It is a structural stereogram of the volute housing in the present invention;

[0016] Figure 4 for Figure 3 A partial enlarged view of part B;

[0017] Figure 5 It is a structural stereogram of the septum tongue of the present invention;

[0018] Figure 6 Schematic diagram of two different angles of the rotating tongue relative to the tongue seat in the present invention;

[0019] Figure 7 is a structural stereogram of the latch in the present invention;

[0020] Figure 8 It is a cross-sectional view of the assembly of the volute housing, the partition tongue and the latch in the present invention;

[0021] Fig. 9 It is a cross-sectional view of the assembly of the septum tongue and the tongue adjusting member of the present invention;

[0022] Fig.10 It is a schematic diagram of the pointer on the rotating shaft and the scale on the tongue base of the present invention;

[0023] In the figure: 1-volute housing; 11-base circle of volute housing; 2-spacer tongue; 21-tongue seat; 22-rotating tongue; 23-limiting protrusion; 24-driven bevel gear; 25-driving bevel gear; 26-rotating shaft; 27-screw; 3-pin. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown, a turbine volute with adjustable tongue length and angle comprises a volute housing 1, a tongue 2, a tongue adjusting member and a latch 3. The tongue 2 comprises a tongue seat 21 and a rotating tongue 22; the mounting shaft integrally formed at the tail of the rotating tongue 22 and the two bosses integrally formed at the head of the tongue seat 21 both constitute a revolving pair; Fig. 9As shown, the tongue adjustment member includes a driven bevel gear 24, a driving bevel gear 25, a rotating shaft 26 and a pressure plate; the driving bevel gear 25 and the driven bevel gear 24 are both placed between two bosses; the driven bevel gear 24 is fixed on the mounting shaft; the driving bevel gear 25 is fixed to the head of the rotating shaft 26 and meshes with the driven bevel gear 24; the rotating shaft 26 and the center hole of the tongue seat 21 constitute a rotating pair; the pressure plate is in contact with the positioning shaft section integrally formed at the rear end of the rotating shaft 26; the pressure plate is provided with n through holes uniformly distributed along the circumferential direction, n ≥ 2; the end surface position of the tongue seat 21 facing the pressure plate is provided with n threaded holes uniformly distributed along the circumferential direction; each through hole of the pressure plate is connected to a threaded hole corresponding to the tongue seat 21 by a screw 27, so that the pressure plate presses the rotating shaft 26. A tongue seat installation groove is provided on one side of the volute housing 1; the tongue seat 21 is placed in the tongue seat installation groove and penetrates into the inner cavity of the volute housing 1 through the groove provided by the volute housing 1; the volute housing 1 is fixed with latch rings at both sides of the tongue seat installation groove, and a limit ring is fixed on the outside of one of the latch rings; the lowest positions of the inner walls of the latch ring and the limit ring are higher than the side of the volute housing 1 where the tongue seat installation groove is provided; the limit ring is provided with a groove for the latch to be pulled out; more than three limit protrusions 23 arranged equidistantly are fixed on the tongue seat 21. Figure 7 As shown, the side wall of the latch pin 3 is provided with an integrally formed clamping strip; the latch pin 3 passes through the gap between the limiting ring, the two latch pin rings and two limiting protrusions on the tongue seat 21, and the clamping strip on the latch pin 3 is placed between the limiting ring and the latch pin ring close to the limiting ring; the clamping strip and the notch of the limiting ring are staggered.

[0026] As a preferred embodiment, Figure 3 As shown, the diameter of the base circle 11 of the volute housing is 170-175 mm.

[0027] More preferably, the number of the upper limiting protrusions on the tongue seat 21 is 8, the distance between adjacent limiting protrusions is 2 mm, and the maximum length of the partition tongue extending into the inner cavity of the volute housing 1 can reach 24 mm.

[0028] More preferably, the length of the latch is 18 mm, and the diameter is equal to the distance between adjacent limiting protrusions on the tongue seat 21 (the diameter is 2 mm), which can completely fix the partition tongue.

[0029] As a preferred embodiment, Fig.10 As shown, a pointer is provided on the end face of the positioning shaft section of the rotating shaft 26, and a scale is provided on the outer edge of the positioning shaft section of the tongue seat 21 for displaying the rotation angle of the rotating tongue.

[0030] The turbine volute with adjustable tongue length and angle works as follows:

[0031] When it is necessary to adjust the length of the partition tongue extending into the inner cavity of the volute shell 1, first rotate the pin to align with the slot position of the limit ring, and then pull the pin 3 out of the gaps between the limit ring, the two pin rings and the two limit protrusions of the tongue seat 21; then manually push and pull the partition tongue 2 according to the length of the partition tongue 2 that needs to be extended into the inner cavity of the volute shell 1, so that the gap between the corresponding two limit protrusions is aligned with the two pin rings; finally, insert the pin 3 back into the limit ring, the two pin rings and the two limit protrusion gaps on the tongue seat 21 that are aligned with the two pin rings, place the clamping strip between the limit ring and the pin ring close to the limit ring, rotate the pin 3 to misalign the clamping strip with the slot of the limit ring, thereby fixing the partition tongue 2.

[0032] When the angle of the partition tongue needs to be adjusted, first unscrew the screws 27 on the pressure plate and remove the pressure plate; then rotate the rotating shaft 21 so that the rotating shaft 21 controls the angle of the rotating tongue 22 through the active bevel gear 25 and the driven bevel gear 24; after reaching the desired angle, reassemble the pressure plate and tighten the screws on the pressure plate so that the pressure plate presses the end face of the positioning shaft section of the rotating shaft, thereby limiting the rotation of the partition tongue through the friction between the pressure plate and the end face of the positioning shaft section of the rotating shaft 21.

[0033] The turbine volute with adjustable baffle length and angle can extend the baffle length and adjust the baffle angle at small and medium flow rates to maximize turbine efficiency. At large flow rates, in order to reduce the radial force, the baffle length is appropriately shortened to ensure stable operation of the turbine and extend equipment life.

Claims

1. A turbine volute with adjustable tongue length and angle, comprising a volute housing and a tongue, characterized in that: It also includes a tongue adjustment piece and a latch; the tongue spacer includes a tongue seat and a rotating tongue; the mounting shaft integrally formed at the tail of the rotating tongue and the two bosses integrally formed at the head of the tongue seat both constitute a rotating pair; the tongue adjustment piece includes a driven bevel gear, an active bevel gear, a rotating shaft and a pressure plate; the active bevel gear and the driven bevel gear are both placed between the two bosses; the driven bevel gear is fixed on the mounting shaft; the active bevel gear is fixed to the head of the rotating shaft and meshes with the driven bevel gear; the rotating shaft and the center hole of the tongue seat constitute a rotating pair; the pressure plate is in contact with the positioning shaft section integrally formed at the tail end of the rotating shaft; the pressure plate is provided with n through holes uniformly distributed along the circumferential direction, n ≥ 2; the end surface position of the tongue seat facing the pressure plate is provided with n threaded holes uniformly distributed along the circumferential direction; each through hole of the pressure plate and a threaded hole corresponding to the tongue seat are screwed together by screws Connection; a tongue seat mounting groove is provided on one of the side surfaces of the volute shell; the tongue seat is placed in the tongue seat mounting groove, and penetrates into the inner cavity of the volute shell through the groove provided by the volute shell; latch rings are fixed on both sides of the tongue seat mounting groove of the volute shell, and a limit ring is fixed on the outer side of one of the latch rings; the lowest positions of the inner walls of the latch ring and the limit ring are higher than the side surface of the volute shell on which the tongue seat mounting groove is provided; the limit ring is provided with a groove; more than three limit protrusions arranged equidistantly are fixed on the tongue seat; an integrally formed clamping strip is provided on the side wall of the latch; the latch passes through the gap between the limit ring, two latch rings and two of the limit protrusions on the tongue seat, and the clamping strip on the latch is placed between the limit ring and the latch ring close to the limit ring; the clamping strip and the groove of the limit ring are staggered.

2. A turbine volute with adjustable tongue length and angle according to claim 1, characterized in that: The base circle diameter of the volute shell is 170-175 mm.

3. A turbine volute with adjustable tongue length and angle according to claim 2, characterized in that: The number of the upper limit protrusions on the tongue seat is 8, and the distance between adjacent limit protrusions is 2 mm.

4. A turbine volute with adjustable tongue length and angle according to claim 3, characterized in that: The length of the latch pin is 18 mm, and the diameter is equal to the distance between adjacent limiting protrusions on the tongue seat.

5. A turbine volute with adjustable tongue length and angle according to any one of claims 1 to 4, characterized in that: A pointer is provided on the end face of the positioning shaft section of the rotating shaft, and a scale is provided at the outer edge of the positioning shaft section of the tongue seat.

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