CN109737069B - Adjustable experimental device for researching sequential effect of guide vanes of multistage centrifugal pump - Google Patents
Adjustable experimental device for researching sequential effect of guide vanes of multistage centrifugal pump Download PDFInfo
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- CN109737069B CN109737069B CN201910097813.XA CN201910097813A CN109737069B CN 109737069 B CN109737069 B CN 109737069B CN 201910097813 A CN201910097813 A CN 201910097813A CN 109737069 B CN109737069 B CN 109737069B
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Abstract
The invention discloses an adjustable experimental device for researching the timing sequence effect of a guide vane of a multistage centrifugal pump. The device comprises a water outlet end rear-mounted volute, a rear-mounted guide vane, an impeller, an indicating device and a ratchet device, wherein the rear-mounted volute, the rear-mounted guide vane, the ratchet and the indicating device are matched through the water outlet end rear-mounted volute, the rear-mounted guide vane, the ratchet device is additionally arranged on a rotating shaft on the basis of not disassembling a multistage centrifugal pump and is connected with the back of the rear-mounted guide vane, the rotating shaft is rotated to realize rotation of the rear-mounted guide vane, the setting angle of the rear-mounted guide vane and the front-mounted guide vane is changed, the effect of different time sequences of the front-mounted guide vane and the rear-mounted guide vane is achieved, and meanwhile the indicating device is additionally arranged on the outer side of the rear-mounted guide vane to display the changing angle of the rear-mounted guide vane. The invention improves the lift and efficiency of the multistage centrifugal pump, ensures that the pump has good cavitation resistance and vibration resistance, improves the comprehensive performance of the multistage centrifugal pump, and avoids the disassembly and assembly of the multistage centrifugal pump.
Description
Technical Field
The invention belongs to the field of multistage centrifugal pumps, and particularly relates to an adjustable experimental device for researching the sequential effect of guide vanes of a multistage centrifugal pump.
Background
The multistage centrifugal pump is widely applied to important fields of national economy such as fire protection, metallurgy, chemical industry, electric power and the like. Conventionally, the hydraulic design of multistage centrifugal pumps adopts a design method of a single pump, and reflection of interstage flow is not considered. In recent years, more and more research and engineering practices have shown that interference of multi-stage centrifugal pump inter-stage flow has a very significant impact on pump performance. Thus, research on how to improve various performances of multistage centrifugal pumps using inter-stage flow interference has become a research hotspot in the current mechanical field, in which optimization of pump performance by adjusting different timing positions of the flow-through members has been developed as an important research direction.
The time sequence position refers to the phenomenon that when the relative circumferential position of a rotor/rotor or stator/stator blade is changed, the changed wake vortex can have different effects on the lower-stage blade row, and the performance of the impeller machinery is changed. In recent years, the timing effect has been widely applied to pneumatic machines such as axial flow compressors, centrifugal compressors, and the like. The test researches at home and abroad show that proper time sequence positions between the rotors play an important role in improving the comprehensive performance of the device. Compared with pneumatic machinery, the flow velocity of fluid in a multistage centrifugal pump is generally lower, but due to higher viscosity, wake vortex at the tail edge of a front guide vane can influence the flow at a rear guide vane at the downstream of an impeller, and a certain time sequence effect exists. For the multistage centrifugal pump with the rear guide vanes, the characteristics of the pump are changed by changing the positions of the rear guide vanes to perform pre-rotation adjustment, so that the working condition adjustment is performed, and the method is an effective method for improving the running efficiency of the multistage centrifugal pump. However, in the case of non-uniform incoming flow, the timing effect of the rear guide vanes and the front guide vanes is rarely studied on the influence of the radial flow type hydro-mechanical performance.
Disclosure of Invention
In order to solve the problems in the background technology, the invention provides an adjustable experimental device for researching the sequential effect of guide vanes of a multistage centrifugal pump, the two-stage centrifugal pump with seven-blade impellers is taken as a research object, the rear volute at the water outlet end, the rear guide vanes, a ratchet wheel and an indicating device are matched, the rotation of the rear guide vanes is realized by rotating a transmission shaft on the basis of not disassembling the multistage centrifugal pump, so that the effect that the front guide vanes and the rear guide vanes have different sequential is achieved, the lift and the efficiency of the multistage centrifugal pump are improved, the pump has good cavitation resistance and vibration resistance, the comprehensive performance of the multistage centrifugal pump is improved, and the disassembly and the assembly of the multistage centrifugal pump are avoided.
The technical scheme of the invention is as follows:
the invention comprises a water outlet end rear volute, a water inlet end front volute and a rotating shaft, wherein the water outlet end rear volute and the water inlet end front volute are respectively positioned at two ends of a multistage centrifugal pump, and a rear guide vane, an impeller, an indicating device and a ratchet device are arranged in the water outlet end rear volute; a front guide vane and an impeller are arranged in the front volute of the water inlet end; the rear guide vane and the front guide vane are guide vane components with the same structure, the guide vane components comprise a disc and guide vane bodies fixed on the side surfaces of the disc, the outer peripheral surface of the guide vane body is provided with multiple guide vanes which are spirally emitted from the center of the guide vane body and spread towards the outer boundary of the guide vane body, and the end part of each guide vane is provided with an opening; the impeller is arranged in the guide vane body, the impeller is connected with the rotating shaft through a key, and the impeller comprises two cover plates and a plurality of working blades connected between the two cover plates.
The ratchet device comprises a ratchet wheel, a pawl and a connecting rod mechanism, wherein the connecting rod mechanism comprises a connecting rod AB, a connecting rod CD, a connecting rod DE, a connecting rod EF, a guide rail, a guide rod I and a guide rod II, the ratchet wheel is connected with a rotating shaft through a key, the ratchet wheel is coaxially arranged with a rear guide vane, a rear guide vane connecting rod is fixed on one side of a guide vane body of the rear guide vane, which is far away from a disc, one side of the rear guide vane connecting rod is connected with one end of the connecting rod DE through a hinge, the other side of the rear guide vane connecting rod is connected with the guide rail, the lower end of the guide rail is connected with the connecting rod AB, one side of the guide rail, which is close to the connecting rod DE, is provided with a chute, the other end of the connecting rod DE is connected with one end of the connecting rod CD through a hinge part fixed on the same side of the connecting rod DE, the other end of the connecting rod CD is hinged to the middle part of the connecting rod AB, the connecting rod EF, the guide rod I and the guide rod II are sequentially connected through a hinge device, one end of the guide rod II, which is far away from the guide rod I is embedded in the chute, and the connecting rod EF and the connecting rod DE are fixedly connected with the two support rods to form a triangle structure; the bottom end of the connecting rod AB is connected with a pawl, and the free end of the pawl is inserted into the ratchet teeth of the ratchet wheel.
When the rotating shaft rotates along the spiral direction of ratchet teeth of the ratchet wheel, the ratchet wheel gives an acting force to the pawl, and meanwhile, the connecting rod mechanism gives a reverse supporting force to the pawl, so that the pawl is clamped with the ratchet wheel, the pawl drives the connecting rod mechanism and the ratchet wheel to rotate simultaneously, and a rear guide vane connecting rod connected with the connecting rod mechanism drives the rear guide vane to rotate.
The indicating device comprises a crank swing rod, a swing rod sliding block, a swing rod wheel, a sliding rail component, a ram, a pointer and a ram support, wherein the bottom of the ram support is fixed in a rear volute at the water outlet end, a shaft lever is fixed in the middle of the ram support, the sliding rail component consists of a horizontal sliding rail and a V-shaped supporting piece supported on the lower end surface of the horizontal sliding rail, the bottom of the V-shaped supporting piece is fixed on the shaft lever, the ram which is slidably mounted along the horizontal sliding rail is mounted on the horizontal sliding rail, the pointer is fixed at the upper end of the ram, and the pointer extends out from a notch formed above the rear volute at the water outlet end; the circle center of the swing rod wheel is arranged on the ram support through a shaft rod, and a plurality of swing rod wheel guide rods are arranged on the outer ring of one side surface of the swing rod wheel at equal intervals; the upper round bar and the lower round bar are respectively fixed at the side surface of the ram and the lower end of the ram support, the crank swing rod consists of a U-shaped bar and a mounting piece fixed at the bottom of the U-shaped bar, the mounting piece is hinged with the ram support through the lower round bar, the swing rod slide block is slidably mounted with the U-shaped bar, the center of the swing rod slide block is connected to a spoke on the other side surface of the swing rod wheel through a pin shaft, and the swing rod slide block is sleeved on the upper round bar through an oval part arranged at the upper end of the swing rod slide block.
The disc peripheral surface of the rear guide vane is provided with a plurality of rear guide vane guide rods at equal intervals, the lower end of the swing rod wheel of the indicating device is contacted with the disc of the rear guide vane, the rear guide vane guide rods are inserted between two adjacent swing rod wheel guide rods at the bottom of the swing rod wheel when the rear guide vane rotates, the swing rod wheel is rotated while the swing rod guide rods rotate, the swing rod sliding block is driven to vertically move along the U-shaped rod and simultaneously swing along the left side and the right side, and the swing of the swing rod sliding block along the left side and the right side drives a ram connected with the elliptical component to reciprocally slide along the horizontal sliding rail, so that the pointer at the upper end of the ram is driven to rotate.
And a dial is arranged above the notch of the rear volute at the water outlet end and used for reading the rotation angle of the pointer of the indicating device, and the rotation angle of the pointer is the rotation angle of the rear guide vane.
The connecting rod AB is vertical to the ground, the connecting rod CD and the connecting rod DE are collinear, when the connecting rod AB is vertical to the ground, the connecting rod CD and the connecting rod DE are collinear, a dead point of the ratchet device is formed, clamping force between the ratchet and the pawl is enhanced, and the connecting rod mechanism always maintains a supporting state for the pawl.
The disc of the rear guide vane is close to the water inlet end, and the guide vane body of the rear guide vane is close to the water outlet end.
The swing rod wheel is positioned between the crank swing rod and the sliding rail component.
The spiral direction of the ratchet teeth of the ratchet wheel is opposite to the spiral direction of the guide vane of the rear guide vane.
The invention has the beneficial effects that:
the invention realizes the effect of different time sequences of the front guide vane and the rear guide vane, improves the lift and the efficiency of the multistage centrifugal pump, ensures that the pump has good cavitation resistance and vibration resistance, and simultaneously improves the comprehensive performance of the multistage centrifugal pump.
The invention can change the angle of the rear guide vane on the basis of not disassembling and assembling the multistage centrifugal pump so as to find the optimal time sequence position of the rear guide vane, reduce the time for disassembling and assembling the pump, improve the efficiency and have certain reference significance for researching the comprehensive performance of the multistage centrifugal pump.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a multistage centrifugal pump.
Fig. 2 is a schematic view of the structure with the volute at the water outlet end of the multistage centrifugal pump removed.
Fig. 3 is a schematic cross-sectional view of a multi-stage centrifugal pump discharge end volute.
FIG. 4 is an enlarged partial schematic view of the junction of the aft vane and the indicator.
FIG. 5 is a schematic view of the overall structure of the ratchet and pawl.
Fig. 6 is a right side view of the pointing device.
Fig. 7 is a schematic structural view of the indicating device.
FIG. 8 is a schematic diagram of a connection structure of a rear guide vane and a ratchet.
FIG. 9 is a side schematic view of a trailing vane.
FIG. 10 is a front view of a ratchet guide.
In the figure: the water outlet end rear-mounted volute (1), a rear-mounted guide vane (2), an indicating device (3), a ratchet wheel (4), a pawl (5), a connecting rod AB (6), a connecting rod CD (7), a connecting rod DE (8), a crank swing rod (9), a swing rod sliding block (10), a swing rod wheel (11), a sliding rail component (12), a ram (13), a rear-mounted guide vane guide rod (14), a dial (15), a rotating shaft (16), an impeller (17), a water inlet end (18), an indicating device pointer (19), a swing rod wheel guide rod (20), a rear-mounted guide vane connecting rod (21), a ram support (23), a connecting rod EF (24), a guide rail (25), a guide rod I (26) and a guide rod II (27).
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
As shown in fig. 1, the invention comprises a water outlet end rear-mounted volute 1, a water inlet end front-mounted volute, a rear-mounted guide vane 2, an indicating device and a ratchet device, wherein the rear-mounted guide vane 2, an impeller 17, the indicating device and the ratchet device are arranged in the water outlet end rear-mounted volute 1; a front guide vane and an impeller 17 are arranged in the front volute of the water inlet end; the water flows in from the right water inlet end 18 and flows out from the left water outlet end; a dial 15 is arranged above the notch of the rear volute 1 at the water outlet end, and a pointer 19 is matched with the dial 15 to display the rotation angle of the rear guide vane 2.
As shown in fig. 2 and 3, the ratchet device and the indicating device 3 are additionally arranged in the implementation of the invention, the rotating shaft 16 is connected with the ratchet 4 and the impeller 17 through keys, the connecting mode among the connecting rod AB6, the connecting rod CD7 and the connecting rod DE8 is pin connection, the connecting mode of the crank swing rod 9 and the swing rod slide block 10 in the indicating device 3 is key connection, meanwhile, the lower end of the crank swing rod 9 is connected with the indicating device pin of the ram 12, the swing rod slide block 10 is connected with the swing rod wheel 11 through pin connection, the crank swing rod 9, the swing rod wheel 11 and the ram support 23 are all pin connection, the indicating device 3 displays the rotation of the rear guide vane 2 through the cooperation between the swing rod wheel guide rod 20 and the rear guide vane guide rod 14, and meanwhile, the rear guide vane 2 is connected with the ratchet device through the rear guide vane connecting rod 21.
As shown in fig. 4, a plurality of rear guide vane guide rods 14 are arranged on the peripheral surface of the disc of the rear guide vane 2 at equal intervals, the lower ends of the swing rod wheels 11 of the indicating device are in contact with the disc of the rear guide vane 2, when the rear guide vane 2 rotates, the rear guide vane guide rods 14 are inserted between two adjacent swing rod wheel guide rods 20 at the bottom of the swing rod wheels 11, the swing rod wheels 11 are stirred to rotate while the rear guide vane guide rods 14 rotate, the swing rod slide blocks 10 are driven to vertically move along the U-shaped rods and swing along the left side and the right side, and the swing of the swing rod slide blocks 10 along the left side and the right side drives a ram 13 connected with an elliptical part to reciprocally slide along a horizontal sliding rail, so that a pointer 19 at the upper end of the ram 13 is driven to rotate.
As shown in fig. 5 and 10, the ratchet device comprises a ratchet 4, a pawl 5 and a link mechanism, the link mechanism comprises a link AB6, a link CD7, a link DE8, a link EF24, a guide rail 25, a guide rod i 26 and a guide rod ii 27, the ratchet is connected with a rotating shaft 16 through a key, the ratchet is coaxially arranged with a rear guide vane 2, one side of a guide vane body of the rear guide vane 2, which is far away from a disc, is fixedly provided with a rear guide vane link 21, one side of the rear guide vane link 21 is connected with one end of the link DE8 through a hinge, the other side of the rear guide vane link 21 is connected with the guide rail 25, the lower end of the guide rail 25 is connected with the link AB6, one side of the guide rail 25, which is close to the link DE8, is connected with one end of the link CD7 through a hinge part fixed on the same side of the link DE8 as the link CD7, the other end of the link CD7 is hinged to the middle part of the link AB6, the link EF24, the guide rod i 26 and the guide rod ii 27 are sequentially connected through a hinge, one end of the guide rod ii 27, which is far from the guide rod i 26 is embedded in the hinge groove, and the link EF24, the link DE8 and the two links with the support rod are fixedly connected to form a triangle structure; the bottom end of the connecting rod AB6 is connected with a pawl 5, and the free end of the pawl 5 is inserted into the ratchet teeth of the ratchet wheel 4; the ratchet teeth of the ratchet wheel 4 spiral in the opposite direction to the guide vane spiral of the rear guide vane 2.
As shown in fig. 6 and 7, the indicating device comprises a crank swing rod 9, a swing rod sliding block 10, a swing rod wheel 11, a sliding rail part 12, a sliding pillow 13, a pointer 19 and a sliding pillow bracket 23, wherein the bottom of the sliding pillow bracket 23 is fixed in a rear volute 1 at the water outlet end, a shaft rod is fixed in the middle of the sliding pillow bracket 23, the sliding rail part 12 consists of a horizontal sliding rail and a V-shaped supporting piece supported on the lower end surface of the horizontal sliding rail, the bottom of the V-shaped supporting piece is fixed on the shaft rod, the sliding pillow 13 which is installed along the horizontal sliding rail in a sliding manner is installed on the horizontal sliding rail, the pointer 19 is fixed at the upper end of the sliding pillow 13, and the pointer 19 extends out from a notch formed above the rear volute 1 at the water outlet end; the circle center of the swing rod wheel 11 is arranged on the ram bracket 23 through a shaft rod, and a plurality of swing rod wheel guide rods 20 are arranged on the outer ring of one side surface of the swing rod wheel 11 at equal intervals; the side of the ram 13 and the lower end of the ram support 23 are respectively fixed with an upper round bar and a lower round bar, the crank swing rod 9 consists of a U-shaped rod and a mounting piece fixed at the bottom of the U-shaped rod, the mounting piece is hinged with the ram support 23 through the lower round bar, the swing rod slide block 10 is slidably mounted with the U-shaped rod, the center of the swing rod slide block 10 is connected to a spoke on the other side of the swing rod wheel 11 through a pin shaft, and the swing rod slide block 10 is sleeved on the upper round bar through an oval part arranged at the upper end of the swing rod slide block 10.
As shown in fig. 8 and 9, the rear guide vane 2 and the front guide vane are guide vane components with the same structure, each guide vane component comprises a disc and a guide vane body fixed on the side surface of the disc, the outer circumferential surface of the guide vane body is provided with seven guide vanes which are spirally emitted from the center of the guide vane body and spread to the outer boundary of the guide vane body, and the end part of each guide vane is provided with an opening; the impeller 17 is arranged in the guide vane body, the impeller 17 is connected with the rotating shaft 16 through keys, and the impeller 17 comprises two cover plates and a plurality of working blades connected between the two cover plates.
Specific examples:
as shown in fig. 8, when the rotating shaft 16 rotates clockwise along the ratchet wheel 4, the pawl 5 is clamped with the ratchet wheel 4 due to the supporting force given by the link mechanism to the pawl 5, the pawl 5 drives the link mechanism to rotate simultaneously with the ratchet wheel 4, and meanwhile, the rear guide vane 2 is connected with the ratchet wheel device through the rear guide vane link 21, so that the rotation of the rear guide vane 2 is ensured by rotating the rotating shaft 16. As shown in fig. 5, the pawl 5 of the ratchet device is coupled to a link AB6, the link CD7, the link DE8 and the rear vane link 21 forming a planar four-bar mechanism, the dead-center position in which the follower is often in-line with the link. When the connecting rod CD7 and the connecting rod DE8 are in the collinear position, that is, the connecting rod CD7 and the connecting rod DE8 are respectively a connecting rod and a driven member in the four-bar mechanism, the position of the mechanism is the dead point position. When the analysis connecting rod AB6 is perpendicular to the ground and the connecting rod CD7 and the connecting rod DE8 form a straight line, a dead point of the ratchet device is formed, even if the pressure of the ratchet 4 to the pawl 5 is larger, the mechanism is always in an effective supporting state, and the rotating accuracy of the rear guide vane is ensured.
As shown in fig. 4, 6 and 7, the rear guide vane rotating rod 14 of the rear guide vane 2 is matched and connected with the swing rod wheel guide rod 20 of the indicating device 3 to drive the indicating device pointer 19 to rotate, and the rotating angle of the rear guide vane 2 is displayed on the dial 15. The indicating device 3 adopts the principle of a parallelogram mechanical link mechanism, the oscillating bar wheel 11 moves circularly, and the oscillating bar slide block 10 on the indicating device is connected with the crank oscillating bar 9 to drive the ram 13 to do reciprocating linear motion, the transmission mechanism of the indicating device 3 has good force transmission characteristic, the occupied space of a mechanism system is small, and the speed of an executing piece changes slowly in the working stroke.
On the basis of not dismantling the multistage centrifugal pump, with 15 degrees as the rotation interval, realize the rotation of rearmounted stator 2 through rotating the pivot, keep leading stator static, change the angle of laying of rearmounted stator and leading stator, in order to reach leading stator and the different time sequence effect of rearmounted stator, in order to improve multistage centrifugal pump lift and efficiency, make the pump have good anti-cavitation performance, anti-vibration performance, in order to improve multistage centrifugal pump's comprehensive properties, and avoided the dismouting of multistage centrifugal pump.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (6)
1. The adjustable experimental device for researching the sequential effect of the guide vanes of the multistage centrifugal pump is characterized by comprising a water outlet end rear-mounted volute (1) and a water inlet end front-mounted volute, wherein the water outlet end rear-mounted volute (1) and the water inlet end front-mounted volute are respectively positioned at two ends of the multistage centrifugal pump, and the water outlet end rear-mounted volute (1) is internally provided with a rear-mounted guide vane (2), an impeller (17), an indicating device (3) and a ratchet device; a front guide vane and an impeller (17) are arranged in the front volute of the water inlet end; the rear guide vane (2) and the front guide vane are guide vane components with the same structure, the guide vane components comprise a disc and guide vane bodies fixed on the side surfaces of the disc, the outer peripheral surface of the guide vane body is provided with a plurality of guide vanes which are spirally emitted from the center of the guide vane body and spread towards the outer boundary of the guide vane body, and the end part of each guide vane is provided with an opening; the impeller (17) is arranged in the guide vane body, the impeller (17) is connected with the rotating shaft (16) through keys, and the impeller (17) comprises two cover plates and a plurality of working blades connected between the two cover plates;
the ratchet device comprises a ratchet wheel (4), a pawl (5) and a connecting rod mechanism, the connecting rod mechanism comprises a connecting rod AB (6), a connecting rod CD (7), a connecting rod DE (8), a connecting rod EF (24), a guide rail (25), a guide rod I (26) and a guide rod II (27), the ratchet wheel is connected with a rotating shaft (16) through keys, the ratchet wheel is coaxially arranged with a rear guide vane (2), one side, far away from a disc, of a guide vane body of the rear guide vane (2) is fixedly provided with a rear guide vane connecting rod (21), one side of the rear guide vane connecting rod (21) is connected with one end of the connecting rod DE (8) through a hinge, the other side of the rear guide vane connecting rod (21) is connected with a guide rail (25), the lower end of the guide rail (25) is connected with the connecting rod AB (6), one side, close to the connecting rod DE (8) of the guide rail (25) is provided with a chute, the other end of the connecting rod DE (8) is connected with one end of the connecting rod CD (7) through a hinge part fixed on the same side as the connecting rod DE (8), the other end of the connecting rod CD (7) is hinged to the middle part of the connecting rod AB (6), the connecting rod EF (24), the guide rod II (27) is connected with one end of the guide rod II (27) through a hinge device, and one end of the guide rod I (24) is far away from the chute (24) is sequentially embedded in the chute The connecting rods DE (8) are fixedly connected with the supporting rods in pairs to form a triangular structure; the bottom end of the connecting rod AB (6) is connected with a pawl (5), and the free end of the pawl (5) is inserted into the ratchet teeth of the ratchet wheel (4);
when the rotating shaft (16) rotates along the spiral direction of ratchet teeth of the ratchet wheel (4), the ratchet wheel (4) gives an acting force to the pawl (5), meanwhile, the connecting rod mechanism gives a reverse supporting force to the pawl (5), so that the pawl (5) is clamped with the ratchet wheel (4), the pawl (5) drives the connecting rod mechanism and the ratchet wheel (4) to rotate simultaneously, and a rear guide vane connecting rod (21) connected with the connecting rod mechanism drives the rear guide vane to rotate;
the indicating device (3) comprises a crank swing rod (9), a swing rod sliding block (10), a swing rod wheel (11), a sliding rail component (12), a ram (13), a pointer (19) and a ram support (23), wherein the bottom of the ram support (23) is fixed in a rear volute (1) at the water outlet end, a shaft rod is fixed in the middle of the ram support (23), the sliding rail component (12) consists of a horizontal sliding rail and a V-shaped supporting piece supported on the lower end surface of the horizontal sliding rail, the bottom of the V-shaped supporting piece is fixed on the shaft rod, the ram (13) which is slidably mounted along the horizontal sliding rail is mounted on the horizontal sliding rail, the pointer (19) is fixed at the upper end of the ram (13), and the pointer (19) extends out from a notch formed above the rear volute (1) at the water outlet end; the circle center of the swing rod wheel (11) is arranged on the ram bracket (23) through a shaft rod, and a plurality of swing rod wheel guide rods (20) are arranged on the outer ring of one side surface of the swing rod wheel (11) at equal intervals; an upper round bar and a lower round bar are respectively fixed at the side surface of the ram (13) and the lower end of the ram support (23), a crank swing rod (9) consists of a U-shaped bar and a mounting piece fixed at the bottom of the U-shaped bar, the mounting piece is hinged with the ram support (23) through the lower round bar, a swing rod sliding block (10) is slidably mounted with the U-shaped bar, the center of the swing rod sliding block (10) is connected to a spoke at the other side surface of the swing rod wheel (11) through a pin shaft, and the swing rod sliding block (10) is sleeved on the upper round bar through an elliptical part arranged at the upper end of the swing rod sliding block (10);
a plurality of rear guide vane guide rods (14) are arranged on the peripheral surface of a disc of the rear guide vane (2) at equal intervals, the lower end of a swing rod wheel (11) of the indicating device (3) is in contact with the disc of the rear guide vane (2), the rear guide vane guide rods (14) are inserted between two adjacent swing rod wheel guide rods (20) at the bottom of the swing rod wheel (11) when the rear guide vane (2) rotates, the swing rod wheel (11) is rotated while the swing rod wheel (14) rotates, the swing rod slider (10) is driven to swing along the left side and the right side while moving up and down along a U-shaped rod, and a ram (13) connected with an elliptic part is driven to slide back and forth along a horizontal sliding rail by the swing of the swing rod slider (10), so that a pointer (19) at the upper end of the ram (13) is driven to rotate.
2. The adjustable experimental device for researching the sequential effect of the guide vanes of the multistage centrifugal pump according to claim 1, wherein a dial (15) is arranged above a notch of a rear volute (1) at the water outlet end, the dial (15) is used for reading the rotation angle of a pointer (19) of an indicating device (3), and the rotation angle of the pointer (19) is the rotation angle of a rear guide vane (2).
3. An adjustable experimental device for studying the timing effect of a vane of a multistage centrifugal pump according to claim 1, wherein the link AB (6) is perpendicular to the ground, the link CD (7) and the link DE (8) are collinear, and when the link AB (6) is perpendicular to the ground, the link CD (7) and the link DE (8) are collinear, the dead point of the ratchet device is formed, and the link mechanism always maintains the supporting state of the pawl (5).
4. The adjustable experimental device for studying the timing effect of the guide vanes of the multistage centrifugal pump according to claim 1, wherein the disc of the rear guide vane (2) is close to the water inlet end, and the guide vane body of the rear guide vane (2) is close to the water outlet end.
5. An adjustable experimental device for studying the timing effect of a multistage centrifugal pump vane according to claim 1, characterized in that the rocker wheel (11) is located between the crank rocker (9) and the slide rail member (12).
6. An adjustable experimental device for studying the timing effect of a multistage centrifugal pump vane according to claim 1, characterized in that the ratchet teeth of the ratchet wheel (4) spiral in the opposite direction to the vane spiral of the trailing vane (2).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102562653A (en) * | 2010-11-30 | 2012-07-11 | 通用电气公司 | System and method for operating a compressor |
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| CN209586690U (en) * | 2019-01-31 | 2019-11-05 | 浙江理工大学 | It is a kind of for studying the adjustable experimental provision of multistage centrifugal pump time |
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| CN102562653A (en) * | 2010-11-30 | 2012-07-11 | 通用电气公司 | System and method for operating a compressor |
| WO2014033878A1 (en) * | 2012-08-30 | 2014-03-06 | 三菱重工業株式会社 | Centrifugal compressor |
| CN203878031U (en) * | 2014-06-01 | 2014-10-15 | 江西丰城华英禽业有限公司 | Sewage treatment device |
| CN107766598A (en) * | 2016-08-19 | 2018-03-06 | 中国航发商用航空发动机有限责任公司 | Turbine optimum timing location determining method and device |
| CN108105158A (en) * | 2018-01-15 | 2018-06-01 | 广东威灵电机制造有限公司 | Diffuser, wind turbine, dust catcher and smoke extractor |
| CN209586690U (en) * | 2019-01-31 | 2019-11-05 | 浙江理工大学 | It is a kind of for studying the adjustable experimental provision of multistage centrifugal pump time |
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