A large power variable frequency wet motor's inside and outside lift complementary device

Abstract

The application provides a large-power variable-frequency wet-type motor internal-external head complementing device, belonging to the technical field of variable-frequency motors, which comprises a rotating shaft, an upper impeller and a lower impeller. The rotating shaft penetrates through the inner wall of the motor and is rotationally connected to the inner wall of the motor. The lower impeller and the upper impeller are connected to the two ends of the rotating shaft and are respectively located on the inner and outer sides of the motor. The peripheries of the upper impeller and the lower impeller are respectively provided with a first shell and a second shell, and the first shell and the second shell are respectively sleeved on the upper and lower ends of the rotating shaft. The two shells are both provided with a first through hole on the two sides, and the first through hole is provided with a plugging valve capable of controlling the conduction of the first through hole. The two shells are both provided with a second through hole on the top, and the second through hole is provided with two first one-way valves capable of switching positions and having opposite conduction directions. The application can complement the head lift of the auxiliary impeller in the inner cavity of the motor and the pump head lift at different rotating speeds of the variable-frequency motor, thereby improving the overall performance of the variable-frequency motor.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of variable frequency motors, and particularly relates to an internal and external head complementary device of a high-power variable frequency wet motor. BACKGROUND

[0002] The high-power variable frequency wet motor adopts an independent internal cooling circulation loop for cooling and heat dissipation. In order to reduce the volume and weight of the motor, the power source of the internal cooling circulation of the motor uses a thrust disc opening as an auxiliary impeller. Considering the limited internal space of the motor cavity and the limited outer diameter of the thrust disc, combined with the hydraulic characteristics of the thrust disc, when the motor is in a medium-low speed working condition, the thrust disc may not provide enough head to push the cooling liquid to overcome the pressure loss in the motor cavity to complete the circulation; when the motor is in a high speed working condition, the thrust disc will provide a head greater than all the pressure losses in the motor cavity. However, at high speed, the head loss generated by the pump head will increase, and the pressure loss needs to be compensated. In summary, at medium-low speed, the internal head of the motor cavity is insufficient, affecting the heat dissipation of the motor; at high speed, the pump head is not enough, affecting the external characteristics of the unit. SUMMARY

[0003] The purpose of the application is to solve the problems mentioned in the background art, and provide an internal and external head complementary device of a high-power variable frequency wet motor, which can compensate for the head generated by the auxiliary impeller in the motor cavity and the head generated by the pump head at different speeds of the variable frequency motor, and improve the overall performance of the variable frequency motor.

[0004] To achieve the above technical purposes, the technical scheme adopted by the application is as follows:

[0005] An internal and external head complementary device of a high-power variable frequency wet motor, comprising a rotating shaft, an upper impeller and a lower impeller; the rotating shaft penetrates through the inner wall of the motor and is rotationally connected to the inner wall of the motor; the lower impeller and the upper impeller are connected to the two ends of the rotating shaft and are located on the inner and outer sides of the motor respectively; the periphery of the upper impeller and the lower impeller is respectively provided with a first outer shell and a second outer shell, and the first outer shell and the second outer shell are sleeved on the upper and lower ends of the rotating shaft;

[0006] Both sides of the two outer shells are provided with a first through hole, and the first through hole is provided with a plugging valve capable of controlling the conduction of the first through hole; the top of each outer shell is provided with a second through hole, and the second through hole is provided with two first one-way valves capable of switching positions and having opposite conduction directions;

[0007] The adjacent first through holes are alternately open; when the first through hole on the side of any shell facing the flow direction of the medium is open, the shell has a first one-way valve in the second through hole for unidirectional conduction of the medium from inside the shell to outside the shell, otherwise the other first one-way valve is in the second through hole; when the first through hole on the side of any shell facing the flow direction of the medium is open, the impeller in the shell rotates under the driving of the external inflow medium to discharge the medium in the shell, otherwise the impeller rotates to suck the medium outside the shell into the shell.

[0008] Preferably, the two shells are provided with first through holes on both sides, and the two shells are provided with second through holes on the top; the two shells are provided with first sliding grooves at the first through holes, and the first sliding grooves are in communication with the first through holes; a blocking valve is slidably connected in the first sliding groove, and a first spring is connected between one end of the blocking valve and the end of the first sliding groove; one end of the first sliding groove is in communication with the conduit, and the other end of the first sliding groove is connected with the first spring; the blocking valve comprises a blocking block A, a connecting rod and a blocking block B connected in sequence, the diameters of the blocking block A and the blocking block B are not less than the diameter of the first through hole; at least one of the blocking block A and the blocking block B has a length not less than the diameter of the first through hole; the diameter of the connecting rod is less than the diameter of the first through hole; the first spring is in a normal state by default, when the medium pushes the blocking valve, the first spring is compressed, and the maximum compression amount of the first spring is not more than the diameter of the first through hole.

[0009] The two shells are provided with second sliding grooves at the second through holes on the top, and the second sliding grooves are in communication with the second through holes; two first one-way valves arranged side by side and having opposite conduction directions are slidably connected in the second sliding groove; a second spring is connected to one end of the second sliding groove and connected to one of the first one-way valves; one end of the second sliding groove is in communication with the conduit.

[0010] The conduit is in communication with a third through hole on the motor gland, the third through hole is provided with a second one-way valve, when the medium flows from the outside of the motor gland into the inside of the motor gland, the second one-way valve is open, when the second one-way valve is open, the blocking valve switches the blocking state of the first through hole, and the positions of the two first one-way valves are switched.

[0011] Preferably, the first shell and the second shell are mirror images along the radial symmetry axis of the rotating shaft; the upper impeller and the lower impeller are centrally symmetrically arranged along the center point of the rotating shaft.

[0012] Preferably, the first sliding groove is perpendicular to the first through hole, and the second sliding groove is perpendicular to the second through hole.

[0013] Preferably, when the communication ends of the first sliding grooves on both sides of the same shell are located at the same end, the setting positions of the blocking block A and the blocking block B of the blocking valves on both sides are opposite, otherwise they are the same; when the communication ends of the first sliding grooves on the same side of different shells are located at opposite ends, the setting positions of the blocking block A and the blocking block B of the two blocking valves are the same, otherwise they are opposite.

[0014] Preferably, a sealing ring is arranged between the end of the connecting rod and the inner wall of the first sliding groove; the length of the connecting rod is not less than the diameter of the first through hole.

[0015] Preferably, the first shell and the second shell each comprise a front cover plate and a rear cover plate, and the front cover plate and the rear cover plate are sealingly connected; the first through hole is arranged on the two sides of the rear cover plate, and the second through hole is arranged on the top of the front cover plate.

[0016] Preferably, the rotating shaft is located between the two sides of the inner wall of the motor and the bottom of the two impellers, and is sequentially sleeved with a static ring, a dynamic ring, a first shaft sleeve and a second shaft sleeve from inside to outside; the static ring is connected to the inner wall of the motor, and the dynamic ring is connected to the first shaft sleeve; the static ring is provided with a groove matched with the dynamic ring, and the dynamic ring is in abutting contact with the static ring; the bottom of the second shaft sleeve is in abutting contact with the top of the first shaft sleeve; the top of the second shaft sleeve is in abutting contact with the bottom of the impeller; and a fastening bolt is arranged on the upper end of the rotating shaft for limiting the axial displacement of the upper impeller.

[0017] Preferably, one end of the first sliding groove is in communication with the outside of the rear cover plate, and a sealing element is arranged at this end for plugging; a first spring is connected between the sealing element and the plugging valve; and the other end of the first sliding groove is in communication with the conduit.

[0018] Preferably, the top of the front cover plate is provided with a groove, and a cover ring matched with the groove is connected to the groove; the second through hole penetrates through the front cover plate and the cover ring; the second sliding groove is arranged on the cover ring; a pressing ring is sleeved on the periphery of each of the two first one-way valves; the top and the bottom of the pressing ring are in abutting contact with the inner wall of the second sliding groove; a second spring is connected to the left end of the second sliding groove, and the right end is in communication with the conduit; and the second spring is connected to the pressing ring on the left side.

[0019] The present application has the following beneficial effects:

[0020] The rotating shaft is rotatably connected to the inner wall of the motor, penetrates through the inner wall of the motor, and is connected to the upper impeller and the lower impeller at the two ends of the rotating shaft, respectively; the shell is arranged on the periphery of the two impellers; the through holes and the plugging valve and the first one-way valve are arranged on the two sides and the top of the shell; the plugging valve and the first one-way valve are in communication with the conduit; the flow medium in the conduit is used to switch the plugging state of the plugging valve and the first one-way valve, so that the two impellers are alternately used as the driving wheel (the impeller in the area where the lift is excessive is used as the driving wheel) and the driven wheel; the driving wheel drives the driven wheel to increase the lift of the flow medium in the area where the driven wheel is located, so as to supplement the lift generated by the auxiliary impeller in the inner cavity of the motor or the lift of the pump head; in this way, the insufficient lift in the inner cavity of the motor at low and medium speeds is avoided, and the heat dissipation of the motor is affected; at high speed, the lift of the pump head is insufficient, and the external characteristics of the unit are affected. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the variable frequency motor;

[0022] Figure 2 is Figure 1 enlarged view of C in FIG. 1;

[0023] Figure 3 is Figure 1 enlarged view of D in FIG. 1;

[0024] Figure 4 is Figure 2 enlarged view of E in FIG. 1;

[0025] Figure 5 is Figure 2 enlarged view of F in FIG. 1;

[0026] Figure 6 is Figure 2 enlarged view of G in FIG. 1;

[0027] Figure 7 is Figure 2 enlarged view of H in FIG. 1;

[0028] Figure 8 is Figure 2 enlarged view of I in FIG. 1;

[0029] Figure 9 is Figure 2 enlarged view of J in FIG. 1;

[0030] Figure 10 is schematic diagram of medium flow when the first outer shell right side first through hole is conducted;

[0031] Figure 11 is schematic diagram of medium flow when the second outer shell right side first through hole is conducted.

[0032] Marked name in the figure:

[0033] 1, rotating shaft, 2, upper impeller, 3, lower impeller, 4, blocking valve, 5, first check valve, 6, conduit, 7, motor gland, 8, motor inner wall, 9, second check valve, 10, front cover plate, 11, rear cover plate, 12, static ring, 13, dynamic ring, 14, first shaft sleeve, 15, second shaft sleeve, 16, sealing element, 17, cover ring, 18, compression ring, 19, first through hole, 20, first sliding chute, 21, first spring, 22, second through hole, 23, second sliding chute, 24, second spring, 25, third through hole, 26, fastening bolt;

[0034] 191, left through hole, 192, right through hole;

[0035] 201, left sliding way, 202, right sliding way, 251, main hole, 252, auxiliary hole, 253, intermediate cavity;

[0036] 301, motor main shaft;

[0037] 401, left blocking valve, 402, right blocking valve, 41, block A, 42, connecting rod, 43, block B. DETAILED DESCRIPTION

[0038] The embodiments of the present application will be further described below in conjunction with the drawings.

[0039] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back" and the like cited in the present application are only for the convenience of clear description, and are not intended to limit the scope of the present application. Changes or adjustments of the relative relationship without substantial changes in the technical content are also considered as the scope of the present application.

[0040] As shown in Figures 1-9 The present application provides an internal and external head complementary device for a high-power variable frequency wet motor, which is specifically as follows:

[0041] As shown in Figure 1 The upper half of the device (the first shell and the structure inside it, and the conduit 6 outside the first shell) is located in the motor outer cavity, and the medium to be delivered is pumped in the motor outer cavity by the pump head;

[0042] The lower half of the device (the second shell and the structure inside it, and the conduit 6 outside the second shell) is located in the motor inner cavity, and the coolant is pumped in the motor inner cavity by the motor inner cavity auxiliary impeller;

[0043] The flow direction of the medium at the position where the motor outer cavity and the motor inner cavity are located is the same, and in the present embodiment, the medium in the motor outer cavity and the medium in the motor inner cavity both flow from the right side to the left side at the above-mentioned position.

[0044] As shown in Figure 3 The motor gland 7 is located in the motor inner cavity, and the medium in the motor inner cavity flows on both sides of the motor gland 7; the motor gland 7 is provided with a third through hole 25, which includes a main hole 251, a secondary hole 252 and an intermediate cavity 253, wherein the main hole 251 communicates the left and right parts of the motor cavity separated by the motor gland 7, and the secondary hole 252 communicates the conduit 6; it should be noted that the position switching of the blocking valve 4 and the first one-way valve 5 by the medium flowing in the conduit 6 in the present embodiment is only a preferred scheme of the present embodiment, and other ways can also be used, such as providing corresponding speed sensors for the auxiliary impeller of the motor inner cavity (or the pump head of the motor outer cavity), and providing corresponding electric push rods for the blocking valve 4 and the first one-way valve 5, so as to control the electric push rods to push the blocking valve 4 and the first one-way valve 5 to switch positions according to the speed detected by the speed sensor;

[0045] The main hole 251 and the auxiliary hole 252 are both communicated with the intermediate cavity 253, the second one-way valve 9 is installed in the main hole 251, and the flow direction is allowed to be one-way from right to left (that is, the flow from the outside to the inside of the motor gland 7);

[0046] The second one-way valve 9 is used to prevent the medium on the left side of the motor gland 7 from flowing in reverse, because the device is located on the left side of the third through hole 25, the medium flowing from the right side will increase the pressure after meeting the device, and the reverse flow may occur, which affects the normal operation of the motor, and the second one-way valve 9 is always in the on state;

[0047] As shown in Figure 2 The shaft 1 is located at the middle position of the motor inner wall 8, and from the axial direction of the shaft 1 itself, the upper half of the shaft 1 is located in the motor outer cavity, the middle part of the shaft 1 is located in the motor inner wall 2, and the lower half of the shaft 1 is located in the motor inner cavity.

[0048] The device is assembled in the motor outer cavity as follows:

[0049] As shown in Figure 2 From top to bottom, the shaft 1 is sequentially sleeved with the upper impeller 2, the second shaft sleeve 15, the first shaft sleeve 14, the dynamic ring 13 and the static ring 12, and the bottom and the top of the two adjacent parts are in contact; the first outer shell is sleeved on the periphery of the upper impeller 2, the first outer shell includes the front cover plate 10 and the rear cover plate 11, the front cover plate 10 is connected to the rear cover plate 11, and the two are in sealed connection;

[0050] The static ring 12 is tightly connected with the rear cover plate 11 of the upper impeller 2, and the static ring 12 is fixedly connected to the motor inner wall 8; the static ring 12 is provided with a groove matched with the dynamic ring 13, and the outer wall of the dynamic ring 13 is in contact with the inner wall of the static ring 12; the static ring 12 and the dynamic ring 13 cooperate with each other to play a sealing role;

[0051] The first shaft sleeve 14 is tightly connected with the dynamic ring 13, and the top of the shaft 1 is provided with a fastening bolt 26 for axially fastening the upper impeller 2, that is, limiting the axial displacement of the upper impeller 2.

[0052] The rear cover plate 11 of the upper impeller 2 is provided with a first through hole 19 and a first sliding groove 20 on both sides (the first through hole 19 and the first sliding groove 20 on both sides can be symmetrically arranged or not symmetrically arranged), the axis of the first through hole 19 is perpendicular to the axis of the shaft 1, and the first through hole 19 communicates the motor outer cavity and the inside of the first outer shell (that is, the first pump cavity in the inside of the first outer shell);

[0053] For the sake of distinction, the first through hole 19 on the left is named as left through hole 191, the first through hole on the right is named as right through hole 192, the first sliding slot 20 on the left is named as left sliding slot 201, the first sliding slot 20 on the right is named as right sliding slot 202; the block valve 4 on the left is named as left block valve 401, the block valve 4 on the right is named as right block valve 402; the distinguished naming is for better description of the structure of the device, to avoid confusion, and the upper half and the lower half of the device are basically mirror image, the specific structure of the lower half can be inferred from the upper half combined with the drawings without objection, so the related structure of the lower half of the device will not be named differently; the subsequent principle description part will not use this part of the distinguished naming, to avoid repetition;

[0054] The left sliding slot 201 is perpendicular to the left through hole 191, and the right sliding slot 202 is perpendicular to the right through hole 192; it should be noted that the first sliding slot 20 on both sides can also be perpendicular to the corresponding first through hole 19 (the left sliding slot 201 corresponds to the left through hole 191, and the right sliding slot 202 corresponds to the right through hole 192), as long as the two are connected, then the block valve 4 in the first sliding slot 20 can block the first through hole 19;

[0055] The upper end of the first sliding slot 20 penetrates the upper part of the back cover plate 11, and is provided with a sealing element 16 to block this end, which can be a sealing bolt, so as to facilitate the installation of the block valve 4; one end of the first spring 21 is connected to the lower end of the sealing element 16, and the other end is connected to the upper end of the block valve 4; the lower end of the first sliding slot 20 is communicated with the conduit 6; the first spring 21 is used to keep the block A41 (or connecting rod 42) of the block valve 4 in the first through hole 19 (which will be described later); and the communication with the conduit 6 is to use the medium conveyed in the conduit 6 to push the block valve 4 to slide along the first sliding slot 20, so that the block A41 (or connecting rod 42) of the block valve 4 left in the first through hole 19 leaves, and then the connecting rod 42 (or the block A41) enters the first through hole 19, thereby completing the switching of the first through hole 19 from the blocked state to the unblocked state (the switching between the two states of being blocked and unblocked);

[0056] The block valve 4 comprises a block A41, a connecting rod 42 and a block B43 connected in sequence, and the cross section is in the shape of a H; the diameters of the block A41 and the block B43 are the same and greater than the diameter of the first through hole 19, and the length of at least one of the block A41 and the block B43 is not less than the diameter of the first through hole 19; in this embodiment, the length of the block A41 is not less than the diameter of the first through hole 19, so that when the block A41 is located in the first through hole 19, the first through hole can be effectively blocked; it should be noted that the diameters of the two blocks can also be different, as long as the diameter of one of the blocks is greater than the diameter of the first through hole 19, but the length of the block with the diameter greater than the diameter of the first through hole 19 should also be greater than the diameter of the first through hole 19, so that the block can effectively block the first through hole when it is placed in the first through hole 19, and in this embodiment, the block is the block A41;

[0057] The diameter of the connecting rod 42 is smaller than the diameter of the first through hole 19, so that the first through hole 19 can be opened when the connecting rod 42 is placed inside the first through hole 19. The length of the connecting rod 42 is not less than the diameter of the first through hole 19, so that only the connecting rod 42 is placed inside the first through hole 19. Otherwise, in order to prevent either the blocking block A41 or the blocking block B43 from detaching from the first sliding groove 20, when the first through hole 19 is to be opened, part of the blocking block A41 or the blocking block B43 will always be located inside the first through hole 19, and the opening effect will not be as good as only the connecting rod 42 being located inside the first through hole 19. Of course, the length of the connecting rod 42 can also be smaller than the diameter of the first through hole 19, but the opening effect will not be good.

[0058] The first spring 21 is in the normal state by default (the so-called normal state is the state without force, the first spring 21 is neither stretched nor compressed). When the medium pushes the sealing valve 4, the first spring 21 is compressed. The maximum compression of the first spring 21 does not exceed the diameter of the first through hole 19. In this way, the maximum displacement of the sealing valve 4 will not exceed the first through hole 19. Thus, whether the plug A41 or the connecting rod 42 is located in the first through hole 19, the displacement of the sealing valve 4 is only enough to move them out of the first through hole 19, and will not cause the plug B43 to disengage from the first slide groove 20.

[0059] The ends of plugs A41 and B43 furthest from the connecting rod (according to...) Figure 4 As shown, a sealing ring is provided between the lower end of the plug block A41 and the upper end of the plug block B43 and the inner wall of the first slide groove 20. This way, when the plugging valve 4 slides in the first slide groove 20, the medium flowing in the first through hole 19 will not enter the gap between the end of the plugging valve 4 and the end of the first slide groove 20. This can both prevent corrosion of the first spring 21 and allow the medium in the conduit 6 to effectively push the plugging valve 4. Moreover, the sealing ring is provided so that even if the diameters of the two plug blocks are different, it will not affect the sealing between the plug block and the first slide groove 20.

[0060] In the embodiment, the setting positions of the blocking block A41 and the blocking block B43 of the blocking valve 4 in the first sliding slot 20 on both sides of the same shell are opposite, for example, the blocking block A41 of the left blocking valve 401 in the first shell is arranged at the upper position, and the blocking block A41 of the right blocking valve 402 is arranged at the lower position; the setting positions of the blocking block A41 and the blocking block B43 of the blocking valve 4 in the first sliding slot 20 on the same side of different shells are the same (for example, the blocking block A41 of the blocking valve 4 on the left side of the first shell and the second shell is arranged at the upper position); however, it should be noted that this is the case when the communication end of the first sliding slot 20 and the conduit 6 is located at the same end (both the upper end or the lower end of the respective sliding slot) on both sides of the same shell, and the communication end of the first sliding slot 20 and the conduit 6 is located at opposite ends (one is the upper end of the sliding slot, and the other is the lower end of the sliding slot, which is relative to the same visual angle direction, for example, the visual angle direction from top to bottom) on the same side of different shells. If the communication end of the first sliding slot 20 and the conduit 6 changes, the setting positions of the blocking block A41 and the blocking block B43 also need to be adjusted accordingly. Specifically, if the connection end of the first sliding slot 20 and the conduit 6 is located at the same end on both sides of the same shell, the setting positions of the blocking block A41 and the blocking block B43 are opposite, otherwise the setting positions are the same; if the connection end of the first sliding slot 20 and the conduit 6 is located at opposite ends on the same side of different shells, the setting positions of the blocking block A41 and the blocking block B43 are the same, otherwise the setting positions are opposite (it should be noted that when the connection end of the conduit 6 changes, the connection end of the first sliding slot 20 and the first spring 21 also changes accordingly, for example, the connection end of the first sliding slot 20 and the conduit 6 is the upper end, and the connection end of the first spring 21 is the lower end, then after replacement, the connection end of the first sliding slot 20 and the conduit 6 is the lower end, and the connection end of the first spring 21 is the upper end).

[0061] The adjacent first through holes 19 are alternately communicated, and the adjacent first through holes 19 include the first through holes 19 on the same shell, that is, the first through holes 19 on both sides of the first shell or the second shell are alternately communicated, for example, the left through hole 191 of the first shell is communicated, and then the right through hole 192 is blocked; meanwhile, the adjacent first through holes 19 also include two first through holes 19 on different two shells and adjacent to each other, and the first through holes 19 on the same side of different two shells are also alternately communicated, that is, the first through holes 19 on the same side (for example, the left side) of the first shell and the second shell are alternately communicated (for example, the first through hole 19 on the left side of the first shell is blocked, and then the first through hole 19 on the left side of the second shell is communicated);

[0062] The top of the front cover plate 10 is provided with a groove, and a cover ring 17 matched with the groove is connected in the groove. The top of the front cover plate 10 is provided with a second through hole 22 penetrating the front cover plate 10 and the cover ring 17. The second through hole 22 is provided with a second sliding groove 23 in the cover ring 17. The left end of the second sliding groove 23 is connected with a second spring 24. Two first one-way valves 5 are slidably connected in the second sliding groove 23 and are arranged side by side and in opposite directions. The two first one-way valves 5 are both sleeved with a compression ring 18. The top and bottom of the compression ring 18 are in abutting contact with the inner wall of the second sliding groove 23, so that the sealing property is ensured. The left end of the second sliding groove 23 is provided with the second spring 24. The two ends of the second spring 24 are connected to the left end of the second sliding groove 23 and the compression ring 18 on the left side, respectively. The right end of the second sliding groove 23 is in communication with a guide pipe 6.

[0063] The second through hole 22 is used for communicating the motor outer cavity and the inside of the first shell. The second spring 24 is used for enabling the left first one-way valve 5 to be located in the second through hole 22. The right end of the second sliding groove 23 is in communication with the guide pipe 6, so that the medium conveyed in the guide pipe 6 is used to push the compression ring 18 around the right first one-way valve 5, and the right first one-way valve 5 enters the second through hole 22.

[0064] When the first through hole 19 on the side of any shell opposite to the direction of the medium flow is in communication, the shell enables the medium to flow from the inside of the shell to the outside of the shell. The first one-way valve 5 located in the second through hole 22 is in one-way communication. Otherwise, the other first one-way valve 5 is located in the second through hole 22 (the working principle part will be described in detail later).

[0065] The structure in the motor inner cavity part (the lower section of the rotating shaft 1) and the structure in the motor outer cavity part are mirror images along the radial symmetry axis of the rotating shaft 1 (the symmetry axis perpendicular to the axis of the rotating shaft 1) (it should be noted that the upper impeller 2 and the lower impeller 3 are arranged in central symmetry along the center point of the rotating shaft 1. The blocking valves 4 on the left and right sides of the first shell are also arranged in central symmetry along the center point of the rotating shaft 1. The two first one-way valves 5 in the first shell and the second shell are arranged in the same direction and at the same position. Except that the above structures are mirror images, the specific assembly of the structure in the motor inner cavity part is not described again.

[0066] The working principle of the inner and outer head complementary device of the high-power variable-frequency wet motor provided by the application is as follows:

[0067] As shown in Figure 10 , when the motor is at a low speed:

[0068] The thrust disc of the motor inner cavity provides insufficient lift to push the cooling liquid inside the motor cavity to overcome the pressure loss to complete the circulation; the lift generated by the pump head will be relatively excessive, at this time the medium pressure in the motor inner cavity flowing into the guide pipe 6 is not enough to push the blocking valve 4 and the first one-way valve 5 to switch positions, at this time the device is in the default state (in the absence of external force, it will always be in this state), that is Figures 1-9 The structure shown in the figure, specifically:

[0069] The first through hole 19 on the right side of the first shell and the left side of the second shell is under the action of the first spring 21, so that the connecting rod 42 of the blocking valve 4 is located in the first through hole 19, and the first through hole 19 on the right side of the first shell and the first through hole 19 on the left side of the second shell are in conduction; The first through hole 19 on the left side of the first shell and the first through hole 19 on the right side of the second shell are under the action of the first spring 21, so that the blocking block A41 of the blocking valve 4 is located in the first through hole 19, and the first through hole 19 on the left side of the first shell and the first through hole 19 on the right side of the second shell are in conduction in the blocking state;

[0070] At this time, the first shell is the first through hole 19 facing the medium flow direction in the motor outer cavity, and the second shell is the first through hole 19 facing away from the medium flow direction in the motor inner cavity; The first one-way valve 5 in the left side of the second sliding groove 23 at the top of the first shell is located at the position of the second through hole 22, and the left side of the first one-way valve 5 allows the medium to flow from the inside to the outside of the first shell in one direction, and under the action of the second spring 24, the left side of the first one-way valve 5 is located at the position of the second through hole. It belongs to the default state (in the absence of external force, it will always be in this state); The second sliding groove 23 at the top of the second shell (note that the top of the two shells is relative to the inner wall 8 of the motor, and the end away from the inner wall 8 of the motor is the top) is also the left side of the first one-way valve 5 is located at the position of the second through hole 22, and the one-way valve allows the medium outside the second shell to flow into the inside in one direction, and under the action of the second spring 24, the left side of the first one-way valve 5 is located at the position of the second through hole 22. It belongs to the default state; This is the first through hole 19 on the side of any shell facing the medium flow direction, and the first one-way valve 5 in the shell allows the medium to flow from the inside to the outside of the shell in one direction, otherwise the other first one-way valve 5 is located in the second through hole 22;

[0071] Because the first through hole 19 on the right side of the first shell is open, and the medium flow direction in the motor outer cavity is counterclockwise (from right to left), the medium in the motor outer cavity will enter the first shell through the first through hole 19 on the right side of the first shell, and then drive the upper impeller 2 to rotate, while the medium in the first shell is continuously discharged from the first shell through the second through hole 22 of the first shell; the rotation of the upper impeller 2 is transmitted to the lower impeller 3 through the shaft 1, and when the lower impeller 3 rotates, the medium outside the second shell is continuously sucked into the second shell through the second through hole 22 of the second shell, and is pressurized by the blade and discharged from the first through hole 19 on the left side of the second shell, and the medium discharged in this way has the same flow direction as the medium in the motor inner cavity, thereby realizing the supplement of the auxiliary impeller lift of the motor inner cavity; the rotation of the upper impeller 2 and the lower impeller 3 discharges and sucks the medium, which is realized by the principle of pump turbine and pump suction.

[0072] When the motor is at high speed:

[0073] The lift generated by the auxiliary impeller (i.e. the thrust disc) in the motor inner cavity will be greater than all the pressure losses in the motor inner cavity, but the lift loss generated by the pump head will increase, at this time the pressure of the medium flowing into the conduit 6 is sufficient to push the blocking valve 4 and the first one-way valve 5 to switch positions, at this time the device is in a non-default state (the switching process of the blocking valve 4 and the first one-way valve 5 is described in detail below), which is:

[0074] The medium in the motor inner cavity flows into the conduit 6 through the third through hole 25, and reaches the communication position of the first chute 20 and the second chute 23 with the conduit 6 through the conduit 6, at this time the pressure of the medium in the conduit 6 is sufficient to push the blocking valve 4 and the first one-way valve 5;

[0075] The medium in the conduit 6 pushes the blocking block (blocking block A41 or blocking block B43, which depends on which blocking block is closer to the communication end of the first chute 20 with the conduit 6) of the blocking valve 4, so that the blocking valve 4 slides in the first chute 20, and the pushing force is just enough to push the connecting rod 42 (or the blocking block A41) originally located in the first through hole 19 to the other end of the first chute (the end connected with the conduit 6), and then push the blocking block A41 (or the connecting rod 42) into the first through hole 19, to realize the switching of the blocking state of the first through hole 19; because the conduit 6 is connected with the four first chutes 20 of the two shells, the switching of the blocking state of the four first through holes 19 can be realized at the same time; after switching, the blocking states of the first through holes 19 are as follows: the first through holes 19 on the right side of the first shell and on the left side of the second shell are blocked; the first through holes 19 on the left side of the first shell and on the right side of the second shell are open;

[0076] The conduit 6 also communicates with the second sliding groove 23, and the medium in the conduit 6 pushes the pressure ring 18 outside the right first one-way valve 5 in the second sliding groove 23, so that the two first one-way valves 5 slide in the second sliding groove 23 until the right first one-way valve 5 is located in the second through hole 22, and the left first one-way valve 5 is extruded (slides to the left side of the second sliding groove 23), because the two second sliding grooves 23 at the top of the two housings are in communication with the conduit 6, so the switching of the one-way conduction direction in the two second through holes 22 can be realized at the same time, and the conduction states of the second through holes 22 after switching are as follows: the one-way conduction from the outside of the first housing to the inside of the first housing at the second through hole 22 of the first housing; the one-way conduction from the inside of the second housing to the outside of the second housing at the second through hole 22 of the second housing;

[0077] After the position switching of the blocking valve 4 and the first one-way valve 5 is completed by the medium in the conduit 6, at this time, the first through hole 19 on the right side of the second housing is in conduction, and the side is opposite to the medium flow direction in the motor cavity, the medium flows into the second housing from the motor cavity through the first through hole 19 on the right side of the second housing, and then drives the lower impeller 3 to rotate, the lower impeller 3 rotates to continuously discharge the medium in the second housing from the second through hole 22 of the second housing; the lower impeller 3 rotates to drive the upper impeller 2 to rotate through the rotating shaft 1, and the upper impeller 2 rotates, and for the same reason, because the upper impeller 2 will continuously suck the medium outside the first housing into the first housing through the second through hole 22 of the first housing, and then discharge the medium after pressurization through the first through hole 19 on the left side of the first housing, and the discharge direction is the same as the medium flow direction in the motor cavity, so that the pump head lift is supplemented.

[0078] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments, and any technical solution belonging to the idea of the present application belongs to the protection scope of the present application. It should be noted that improvements and decorations without departing from the principle of the present application are considered as the protection scope of the present application for ordinary technical personnel in the technical field.

Claims

1. A complementary internal and external head device for a high-power variable frequency wet motor, characterized in that: It includes a rotating shaft (1), an upper impeller (2) and a lower impeller (3); the rotating shaft (1) passes through the inner wall (8) of the motor and is rotatably connected to the inner wall (8) of the motor; the lower impeller (3) and the upper impeller (2) are connected to the two ends of the rotating shaft (1) and are located on the inner and outer sides of the motor respectively; the upper impeller (2) and the lower impeller (3) are respectively provided with a first outer shell and a second outer shell, and the first outer shell and the second outer shell are respectively fitted on the upper and lower ends of the rotating shaft (1); Both sides of the two housings are provided with a first through hole (19), and the first through hole (19) is provided with a sealing valve (4) that can control the conduction of the first through hole (19); both housings are provided with a second through hole (22) at the top, and the second through hole (22) is provided with two first check valves (5) that can be switched and have opposite conduction directions. The adjacent first through holes (19) are alternately connected; when any first through hole (19) on the side of the housing facing the direction of medium flow is connected, the housing causes the medium to flow from inside the housing to outside the housing, and the unidirectional first check valve (5) is located in the second through hole (22), otherwise the other first check valve (5) is located in the second through hole (22); when any first through hole (19) on the side of the housing facing the direction of medium flow is connected, the impeller inside the housing rotates under the drive of the external medium flowing in to discharge the medium inside the housing, otherwise the impeller rotates to draw the medium outside the housing into the housing.

2. The internal and external head complementary device for a high-power variable frequency wet motor according to claim 1, characterized in that: Both outer shells have a first through hole (19) on both sides and a second through hole (22) on the top of both outer shells; both outer shells have a first sliding groove (20) at the first through hole (19), and the first sliding groove (20) communicates with the first through hole (19); a sealing valve (4) is slidably connected in the first sliding groove (20), and a first spring (21) is connected between one end of the sealing valve (4) and the end of the first sliding groove (20); one end of the first sliding groove (20) is connected to the conduit (6), and the other end of the first sliding groove (20) is connected to the first spring (21); the sealing valve (4) includes a series of... The connecting block A (41), connecting rod (42) and block B (43) are connected. The diameter of block A (41) and block B (43) is not less than the diameter of the first through hole (19). At least one of the block A (41) and block B (43) has a length not less than the diameter of the first through hole (19). The diameter of the connecting rod (42) is less than the diameter of the first through hole (19). The first spring (21) is in normal state by default. When the medium pushes the sealing valve (4), the first spring (21) is compressed. The maximum compression of the first spring (21) does not exceed the diameter of the first through hole (19). The top of the two outer shells is provided with a second slide groove (23) at the second through hole (22), and the second slide groove (23) is connected to the second through hole (22); two first check valves (5) arranged side by side and with opposite conduction directions are slidably connected in the second slide groove (23); a second spring (24) is connected to one end of the second slide groove (23), and the second spring (24) is connected to one of the first check valves (5); one end of the second slide groove (23) is connected to the conduit (6); The conduit (6) is connected to the third through hole (25) on the motor cover (7). The third through hole (25) is equipped with a second one-way valve (9). When the medium flows from the outside of the motor cover (7) into the inside of the motor cover (7), the second one-way valve (9) is turned on.

3. The internal and external head complementary device for a high-power variable frequency wet motor according to claim 1, characterized in that: The first and second housings are mirror images of each other along the radial axis of symmetry of the rotating shaft (1); the upper impeller (2) and the lower impeller (3) are centrally symmetrical about the center point of the rotating shaft (1).

4. The internal and external head complementary device for a high-power variable frequency wet motor according to claim 2, characterized in that: The first groove (20) is perpendicular to the first through hole (19), and the second groove (23) is perpendicular to the second through hole (22).

5. The internal and external head complementary device for a high-power variable frequency wet motor according to claim 2, characterized in that: When the first slide groove (20) on both sides of the same housing is connected to the conduit (6) at the same end, the blocking block A (41) and blocking block B (43) of the two blocking valves (4) are set in opposite positions; otherwise, they are the same.

6. The internal and external head complementary device for a high-power variable frequency wet motor according to claim 2, characterized in that: A sealing ring is provided between the ends of the plugs A (41) and B (43) away from the connecting rod (42) and the inner wall of the first groove (20); the length of the connecting rod (42) is not less than the diameter of the first through hole (19).

7. The internal and external head complementary device for a high-power variable frequency wet motor according to claim 2, characterized in that: Both the first and second housings include a front cover plate (10) and a rear cover plate (11), which are sealed together; the first through hole (19) is opened on both sides of the rear cover plate (11), and the second through hole (22) is opened on the top of the front cover plate (10).

8. The internal and external head complementary device for a high-power variable frequency wet motor according to claim 7, characterized in that: The shaft (1) located between the two sides of the inner wall (8) of the motor and the bottom of the two impellers is fitted with a stationary ring (12), a moving ring (13), a first bushing (14), and a second bushing (15) in sequence from the inner wall (8) of the motor to the bottom of the impeller. The stationary ring (12) is connected to the inner wall (8) of the motor, and the moving ring (13) is connected to the first bushing (14). The stationary ring (12) has a groove that matches the moving ring (13), and the moving ring (13) abuts against the stationary ring (12). The bottom of the second bushing (15) abuts against the top of the first bushing (14). The top of the second bushing (15) abuts against the bottom of the impeller. The upper end of the shaft (1) is provided with a fastening bolt (26) to limit the axial displacement of the upper impeller (2).

9. The internal and external head complementary device for a high-power variable frequency wet motor according to claim 7, characterized in that: One end of the first slide (20) is connected to the outside of the rear cover plate (11), and a sealing element (16) is provided at this end to block it. The first spring (21) is connected between the sealing element (16) and the sealing valve (4); the other end of the first slide (20) is connected to the conduit (6).

10. The internal and external head complementary device for a high-power variable frequency wet motor according to claim 7, characterized in that: The front cover plate (10) has a groove at the top and is connected to a cover ring (17) that matches the groove. The second through hole (22) passes through the front cover plate (10) and the cover ring (17). The second slide groove (23) is set on the cover ring (17). The two first one-way valves (5) are fitted with pressure rings (18) around their peripheries. The top and bottom of the pressure rings (18) are in contact with the inner wall of the second slide groove (23). The left end of the second slide groove (23) is connected to a second spring (24), and the right end is connected to the conduit (6). The second spring (24) is connected to the pressure ring (18) on the left side.

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