A multistage pump for automatically regulating pressure balance

Abstract

The present invention discloses a multistage pump with automatic pressure balance regulation, which includes a fixed housing, a first inner cavity, a first transmission shaft, a first output hole, an external connecting pipe, a first impeller, a first motor, a transmission mechanism, a second inner cavity, a second impeller, a second output hole, a second transmission shaft and an automatic regulation mechanism; The present invention has a reasonable and simple structure, low production cost, convenient installation and complete functions. The provided transmission mechanism can drive the first transmission shaft and the second transmission shaft to rotate together, and at the same time, it does not affect the slight axial movement generated by the first transmission shaft and the second transmission shaft, which helps to balance the axial forces of the first transmission shaft and the second transmission shaft; The automatic regulation mechanism provided in the present invention can automatically adjust the pressures in the first inner cavity and the second inner cavity through the lateral movement of the slider, thereby improving the service life of this multistage pump.

Description

Technical Field

[0001] The present invention relates to the technical field of multistage pumps, and particularly to a multistage pump with automatic regulation of pressure balance. Background Art

[0002] A single-suction type impeller in a pump generates an axial thrust load on the rotor of the pump, and the axial thrust load must be absorbed by a thrust bearing. The axial thrust load is the product of the pressure difference across the impeller (from the hub side to the eye side) multiplied by the area to which the differential pressure is exposed. Thus, the axial thrust load is in the direction towards the eye side of the impeller. Larger pumps with larger exposed areas generate higher axial thrust loads, and higher head pumps with higher differential pressures across the impeller generate higher thrust loads. For pumps having multiple stages (i.e., two or more impeller-housing groups in series), the axial thrust load is a multiple of the number of stages. The total thrust load on the rotor of the pump often exceeds the load rating of the available thrust bearing, and currently, the axial thrust load is partially reduced by applying existing thrust balance techniques, while in actual use, the balance techniques in existing multistage pumps cannot automatically regulate the pressure, thereby affecting the service life of the multistage pump. Summary of the Invention

[0003] The object of the present invention is to provide a multistage pump with automatic regulation of pressure balance to solve the problem that in actual use, the balance techniques in existing multistage pumps cannot automatically regulate the pressure, thereby affecting the service life of the multistage pump.

[0004] To solve the above problems, the present invention provides a technical solution: a multi-stage pump for automatically regulating pressure balance, and its innovation lies in: including a fixed housing, an inner cavity one, a transmission shaft one, an output hole one, an external connection pipe, an impeller one, a motor one, a transmission mechanism, an inner cavity two, an impeller two, an output hole two, a transmission shaft two, and an automatic regulation mechanism; the inner cavity one is arranged inside the center of the left side of the fixed housing, and an output hole one is opened on the upper left side of the inner cavity one; the transmission shaft one is movably connected to the center of the inner cavity one; there are several impellers one, and the inside of each of the several impellers one is fixedly connected to the outside of the transmission shaft one; the inner cavity two is arranged inside the center of the right side of the fixed housing, and an output hole two is opened on the upper right side of the inner cavity two; the transmission shaft two is movably connected to the center of the inner cavity two; there are several impellers two, and the inside of each of the several impellers two is fixedly connected to the outside of the transmission shaft two; the motor one is fixedly connected to the center of the upper side of the fixed housing; the transmission mechanism is arranged inside the center of the fixed housing, the upper side of the transmission mechanism is connected to the output shaft on the lower side of the motor one, and the left and right sides of the transmission mechanism are respectively connected to the inner ends of the transmission shaft one and the transmission shaft two; the automatic regulation mechanism is arranged inside the center of the lower side of the fixed housing, the upper left side of the automatic regulation mechanism is communicated with the lower right side of the inner cavity one, and the upper right side of the automatic regulation mechanism is connected to the lower left side of the inner cavity two; the external connection pipe is fixedly connected to the outside of the rear side of the fixed housing, the left opening of the external connection pipe is connected to the upper opening of the output hole one, and the right opening of the external connection pipe is connected to the upper opening of the output hole two.

[0005] Preferably, the specific structure of the transmission mechanism includes a driven gear one, a connection key one, a thrust ball bearing, a driven gear two, a connection key two, and a driving gear two; the inside of the center of the driving gear two is fixedly connected to the outside of the output shaft on the lower side of the motor one; the driven gear one is movably connected to the inside of the center of the left side of the fixed housing, the tooth part on the upper right side of the driven gear one is connected to the tooth part on the lower left side of the driving gear two, and the inside of the center of the driven gear one is movably connected to the outside of the right side of the transmission shaft one through several connection keys one; the driven gear two is movably connected to the inside of the center of the right side of the fixed housing, the upper left side of the driven gear two is connected to the lower right side of the driving gear two, and the inside of the driven gear two is movably connected to the outside of the left side of the transmission shaft two through several connection keys two; the thrust ball bearing is movably connected to the inside of the center of the fixed housing, the left side of the thrust ball bearing is connected to the right end of the transmission shaft one, and the right side of the thrust ball bearing is connected to the left end of the transmission shaft two.

[0006] Preferably, the specific structure of the automatic regulation mechanism includes an input hole 1, a sliding cavity, a groove 1, an output port 1, an input port 1, an output channel, an output connector, an input port 2, an output port 2, an input hole 2, a groove 2, and a slider; the sliding cavity is arranged inside the lower side of the center of the fixed housing, an input hole 1 is opened on the upper left side of the sliding cavity, and the upper opening of the input hole 1 is communicated with the lower right side of the inner cavity 1, an input hole 2 is opened on the upper right side of the sliding cavity, and the upper opening of the input hole 2 is communicated with the lower left side of the inner cavity 2; the outside of the slider is horizontally movably connected inside the sliding cavity, a groove 1 is opened on the left side of the slider, and a groove 2 is opened on the right side of the slider; an output port 1 is opened on the lower right side of the groove 1; an output port 2 is opened on the lower left side of the groove 2; the output channel is arranged inside the center of the lower side of the fixed housing, an input port 1 is opened on the upper left side of the output channel, and the input port 1 is communicated with the output port 1, an input port 2 is opened on the upper right side of the output channel, and the input port 2 is communicated with the output port 2, and an output connector is fixedly connected to the central opening on the lower side of the output channel.

[0007] Preferably, the slider is rectangular.

[0008] Preferably, an arc-shaped flow guiding surface is provided at the upper right corner of the groove 1.

[0009] Preferably, an arc-shaped flow guiding surface is provided at the upper left corner of the groove 2.

[0010] Preferably, the impeller 1 and the impeller 2 are symmetrically arranged.

[0011] Preferably, an input connector is provided in the center of the outer connecting pipe.

[0012] The beneficial effects of the present invention:

[0013] (1) The present invention has a reasonable and simple structure, low production cost, convenient installation, and complete functions. The provided transmission mechanism can drive the transmission shaft 1 and the transmission shaft 2 to rotate together, and at the same time, it does not affect the small axial movement generated by the transmission shaft 1 and the transmission shaft 2, which is helpful for the balance of the axial forces of the transmission shaft 1 and the transmission shaft 2.

[0014] (2) The automatic regulation mechanism provided in the present invention can automatically adjust the pressures in the inner cavity 1 and the inner cavity 2 through the horizontal movement of the slider, thereby improving the service life of this multistage pump. Description of the drawings

[0015] Figure 1 It is a schematic structural diagram of the present invention.

[0016] Figure 2 It is a schematic structural diagram of the transmission mechanism.

[0017] Figure 3 It is a schematic structural diagram of the automatic regulation mechanism.

[0018] 1 - Fixed housing; 2 - First inner cavity; 3 - First drive shaft; 4 - First output hole; 5 - Outer connecting pipe; 6 - First impeller; 7 - First motor; 8 - Transmission mechanism; 9 - Second inner cavity; 10 - Second impeller; 11 - Second output hole; 12 - Second drive shaft; 13 - Automatic regulation mechanism; 81 - First driven gear; 82 - First connecting key; 83 - Thrust ball bearing; 84 - Second driven gear; 85 - Second connecting key; 86 - Second driving gear; 131 - First input hole; 132 - Sliding cavity; 133 - First groove; 134 - First output port; 135 - First input port; 136 - Output channel; 137 - Output joint; 138 - Second input port; 139 - Second output port; 1310 - Second input hole; 1311 - Second groove; 1312 - Slide block. Specific embodiments

[0019] Example 1

[0020] As Figure 1 shown, the following technical solutions are adopted in this specific embodiment: A multi - stage pump for automatically regulating pressure balance includes a fixed housing 1, a first inner cavity 2, a first drive shaft 3, a first output hole 4, an outer connecting pipe 5, a first impeller 6, a first motor 7, a transmission mechanism 8, a second inner cavity 9, a second impeller 10, a second output hole 11, a second drive shaft 12 and an automatic regulation mechanism 13; the first inner cavity 2 is arranged inside the center of the left side of the fixed housing 1, and a first output hole 4 is opened on the upper left side of the first inner cavity 2; the first drive shaft 3 is movably connected to the center of the first inner cavity 2; there are several first impellers 6, and several first impellers 6 are fixedly connected to the outside of the first drive shaft 3; the second inner cavity 9 is arranged inside the center of the right side of the fixed housing 1, and a second output hole 11 is opened on the upper right side of the second inner cavity 9; the second drive shaft 12 is movably connected to the center of the second inner cavity 9; there are several second impellers 10, and several second impellers 10 are fixedly connected to the outside of the second drive shaft 12; the first motor 7 is fixedly connected to the center of the upper side of the fixed housing 1; the transmission mechanism 8 is arranged inside the center of the fixed housing 1, the upper side of the transmission mechanism 8 is connected to the lower output shaft of the first motor 7, and the left and right sides of the transmission mechanism 8 are respectively connected to the inner ends of the first drive shaft 3 and the second drive shaft 12; the automatic regulation mechanism 13 is arranged inside the center of the lower side of the fixed housing 1, the upper left side of the automatic regulation mechanism 13 is communicated with the lower right side of the first inner cavity 2, and the upper right side of the automatic regulation mechanism 13 is connected to the lower left side of the second inner cavity 9; the outer connecting pipe 5 is fixedly connected to the outside of the rear side of the fixed housing 1, the left opening of the outer connecting pipe 5 is connected to the upper opening of the first output hole 4, and the right opening of the outer connecting pipe 5 is connected to the upper opening of the second output hole 11.

[0021] Example 2

[0022] As Figure 1As shown in the figure, the following technical solutions are adopted in this specific embodiment: A multi-stage pump for automatically regulating pressure balance includes a fixed housing 1, an inner cavity 1, a drive shaft 1, an output hole 1, an external connecting pipe 5, an impeller 1, a motor 1, a transmission mechanism 8, an inner cavity 2, an impeller 2, an output hole 2, a drive shaft 2, and an automatic regulation mechanism 13; the inner cavity 1 is arranged inside the center of the left side of the fixed housing 1, and an output hole 1 is provided on the upper left side of the inner cavity 1; the drive shaft 1 is movably connected to the center of the inner cavity 1; there are several impellers 1, and several impellers 1 are fixedly connected to the outside of the drive shaft 1; the inner cavity 2 is arranged inside the center of the right side of the fixed housing 1, and an output hole 2 is provided on the upper right side of the inner cavity 2; the drive shaft 2 is movably connected to the center of the inner cavity 2; there are several impellers 2, and several impellers 2 are fixedly connected to the outside of the drive shaft 2; the motor 1 is fixedly connected to the center of the upper side of the fixed housing 1; the transmission mechanism 8 is arranged inside the center of the fixed housing 1, the upper side of the transmission mechanism 8 is connected to the lower output shaft of the motor 1, and the left and right sides of the transmission mechanism 8 are respectively connected to the inner ends of the drive shaft 1 and the drive shaft 2; the automatic regulation mechanism 13 is arranged inside the center of the lower side of the fixed housing 1, the upper left side of the automatic regulation mechanism 13 is connected to the lower right side of the inner cavity 1, and the upper right side of the automatic regulation mechanism 13 is connected to the lower left side of the inner cavity 2; the external connecting pipe 5 is fixedly connected to the outside of the rear side of the fixed housing 1, the left opening of the external connecting pipe 5 is connected to the upper opening of the output hole 1, and the right opening of the external connecting pipe 5 is connected to the upper opening of the output hole 2.

[0023] As Figure 2 shown, the specific structure of the transmission mechanism 8 includes a driven gear 1, a connecting key 1, a thrust ball bearing 83, a driven gear 2, a connecting key 2, and a driving gear 2; the inside of the center of the driving gear 2 is fixedly connected to the outside of the lower output shaft of the motor 1; the driven gear 1 is movably connected to the inside of the left side of the center of the fixed housing 1, the upper right tooth part of the driven gear 1 is connected to the lower left tooth part of the driving gear 2, and the inside of the center of the driven gear 1 is movably connected to the outside of the right side of the drive shaft 1 through several connecting keys 1; the driven gear 2 is movably connected to the inside of the right side of the center of the fixed housing 1, the upper left side of the driven gear 2 is connected to the lower right side of the driving gear 2, and the inside of the driven gear 2 is movably connected to the outside of the left side of the drive shaft 2 through several connecting keys 2; the thrust ball bearing 83 is movably connected to the inside of the center of the fixed housing 1, the left side of the thrust ball bearing 83 is connected to the right end of the drive shaft 1, and the right side of the thrust ball bearing 83 is connected to the left end of the drive shaft 2.

[0024] Example 3

[0025] AsFigure 1 As shown in the figure, the following technical solutions are adopted in this specific embodiment: A multi-stage pump for automatically regulating pressure balance includes a fixed housing 1, an inner cavity 1, a drive shaft 1, an output hole 1, an external connection pipe 5, an impeller 1, a motor 1, a transmission mechanism 8, an inner cavity 2, an impeller 2, an output hole 2, a drive shaft 2, and an automatic regulation mechanism 13; the inner cavity 1 is arranged inside the center of the left side of the fixed housing 1, and an output hole 1 is provided on the upper left side of the inner cavity 1; the drive shaft 1 is movably connected to the center of the inner cavity 1; there are several impellers 1, and several impellers 1 are fixedly connected to the outside of the drive shaft 1; the inner cavity 2 is arranged inside the center of the right side of the fixed housing 1, and an output hole 2 is provided on the upper right side of the inner cavity 2; the drive shaft 2 is movably connected to the center of the inner cavity 2; there are several impellers 2, and several impellers 2 are fixedly connected to the outside of the drive shaft 2; the motor 1 is fixedly connected to the center of the upper side of the fixed housing 1; the transmission mechanism 8 is arranged inside the center of the fixed housing 1, the upper side of the transmission mechanism 8 is connected to the lower output shaft of the motor 1, and the left and right sides of the transmission mechanism 8 are respectively connected to the inner ends of the drive shaft 1 and the drive shaft 2; the automatic regulation mechanism 13 is arranged inside the center of the lower side of the fixed housing 1, the upper left side of the automatic regulation mechanism 13 is communicated with the lower right side of the inner cavity 1, and the upper right side of the automatic regulation mechanism 13 is connected to the lower left side of the inner cavity 2; the external connection pipe 5 is fixedly connected to the outside of the rear side of the fixed housing 1, the left opening of the external connection pipe 5 is connected to the upper opening of the output hole 1, and the right opening of the external connection pipe 5 is connected to the upper opening of the output hole 2.

[0026] As Figure 2 shown in the figure, the specific structure of the transmission mechanism 8 includes a driven gear 1, a connection key 1, a thrust ball bearing 83, a driven gear 2, a connection key 2, and a driving gear 2; the center of the driving gear 2 is fixedly connected to the outside of the lower output shaft of the motor 1; the driven gear 1 is movably connected to the left side inside the center of the fixed housing 1, the upper right tooth part of the driven gear 1 is connected to the lower left tooth part of the driving gear 2, and the center of the driven gear 1 is movably connected to the outside of the right side of the drive shaft 1 through several connection keys 1; the driven gear 2 is movably connected to the right side inside the center of the fixed housing 1, the upper left side of the driven gear 2 is connected to the lower right side of the driving gear 2, and the inside of the driven gear 2 is connected to the outside of the left side of the drive shaft 2 through several connection keys 2; the thrust ball bearing 83 is movably connected to the center of the fixed housing 1, the left side of the thrust ball bearing 83 is connected to the right end of the drive shaft 1, and the right side of the thrust ball bearing 83 is connected to the left end of the drive shaft 2.

[0027] As Figure 3As shown in the figure, the specific structure of the automatic regulation mechanism 13 includes an input hole 131, a sliding cavity 132, a first groove 133, an output port 134, an input port 135, an output channel 136, an output connector 137, an input port 138, an output port 139, a second input hole 1310, a second groove 1311 and a slider 1312; the sliding cavity 132 is arranged inside the lower side of the central part of the fixed housing 1, the first input hole 131 is opened on the upper left side of the sliding cavity 132, and the upper opening of the input hole 131 is communicated with the lower right side of the first inner cavity 2, the second input hole 1310 is opened on the upper right side of the sliding cavity 132, and the upper opening of the input hole 1310 is communicated with the lower left side of the second inner cavity 9; the outside of the slider 1312 is horizontally movably connected inside the sliding cavity 132, the first groove 133 is arranged on the left side of the slider 1312, and the second groove 1311 is arranged on the right side of the slider 1312; the output port 134 is opened on the lower right side of the first groove 133; the output port 139 is opened on the lower left side of the second groove 1311; the output channel 136 is arranged inside the central part of the lower side of the fixed housing 1, the input port 135 is opened on the upper left side of the output channel 136, and the input port 135 is communicated with the output port 134, the input port 138 is opened on the upper right side of the output channel 136, and the input port 138 is communicated with the output port 139, and the output connector 137 is fixedly connected to the central opening on the lower side of the output channel 136.

[0028] Among them, the slider 1312 is rectangular, thus ensuring that the slider 1312 can only move horizontally; the upper right corner of the first groove 133 is provided with an arc-shaped flow guiding surface; the upper left corner of the second groove 1311 is provided with an arc-shaped flow guiding surface; the first impeller 6 and the second impeller 10 are symmetrically arranged, thus improving the balance effect; the central part of the outer connecting pipe 5 is provided with an input connector.

[0029] The working state of the present invention is as follows: The present invention has a reasonable and simple structure, low production cost, convenient installation, and complete functions. When in use, first start the first motor 7 to drive the second driving gear 86 to rotate. The rotation of the second driving gear 86 simultaneously drives the first driven gear 81 and the second driven gear 84 to rotate. The rotation of the first driven gear 81 causes the first transmission shaft 3 to drive the first impeller 6 to rotate, so that water can be output through the automatic regulation mechanism 13 for use. Similarly, the rotation of the second driven gear 84 can cause the second impeller 10 to rotate and output water through the automatic regulation mechanism 13 for use. The provided transmission mechanism 8 can drive the first transmission shaft 3 and the second transmission shaft 12 to rotate together, and at the same time does not affect the slight axial movement generated by the first transmission shaft 3 and the second transmission shaft 12, which helps to balance the axial forces of the first transmission shaft 3 and the second transmission shaft 12. The provided automatic regulation mechanism 13 can automatically adjust the pressures in the first cavity 2 and the second cavity 9 through the lateral movement of the slider 1312, thereby increasing the service life of this multi-stage pump. During specific adjustment, when the pressure in the first cavity 2 is too high, it will cause the slider 1312 to move to the right. When the slider 1312 moves to the right, the opening between the first output port 134 and the first input port 135 will become larger to reduce the water pressure, and at the same time, the opening between the second input port 138 and the second output port 139 will become smaller to increase the water pressure, so that the slider 1312 can automatically adjust, ensuring that the pressures in the first cavity 2 and the second cavity 9 are always in a balanced state.

[0030] The control mode of the present invention is to be controlled manually or through existing automation technologies. The wiring diagram of the power element and the power supply are common knowledge in the art, and the present invention mainly aims to protect mechanical devices, so the control mode and wiring layout of the present invention will not be further explained in detail.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0032] In the present invention, unless otherwise clearly specified or limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A multistage pump for automatically regulating pressure balance, characterized in that: It includes a fixed housing (1), a first inner cavity (2), a first transmission shaft (3), a first output hole (4), an outer connecting pipe (5), a first impeller (6), a first motor (7), a transmission mechanism (8), a second inner cavity (9), a second impeller (10), a second output hole (11), a second transmission shaft (12), and an automatic regulation mechanism (13); The first inner cavity (2) is arranged inside the center of the left side of the fixed housing (1), and a first output hole (4) is provided on the upper left side of the first inner cavity (2); The first transmission shaft (3) is movably connected to the center of the first inner cavity (2); There are several first impellers (6), and several first impellers (6) are fixedly connected to the outside of the first transmission shaft (3) inside; The second inner cavity (9) is arranged inside the center of the right side of the fixed housing (1), and a second output hole (11) is provided on the upper right side of the second inner cavity (9); The second transmission shaft (12) is movably connected to the center of the second inner cavity (9); There are several second impellers (10), and several second impellers (10) are fixedly connected to the outside of the second transmission shaft (12) inside; The first motor (7) is fixedly connected to the center of the upper side of the fixed housing (1); The transmission mechanism (8) is arranged inside the center of the fixed housing (1), the upper side of the transmission mechanism (8) is connected to the output shaft of the lower side of the first motor (7), and the left and right sides of the transmission mechanism (8) are respectively connected to the inner ends of the first transmission shaft (3) and the second transmission shaft (12); The automatic regulation mechanism (13) is arranged inside the center of the lower side of the fixed housing (1), the upper left side of the automatic regulation mechanism (13) is communicated with the lower right side of the first inner cavity (2), and the upper right side of the automatic regulation mechanism (13) is connected to the lower left side of the second inner cavity (9); The outer connecting pipe (5) is fixedly connected to the outside of the rear side of the fixed housing (1), the left opening of the outer connecting pipe (5) is connected to the upper opening of the first output hole (4), and the right opening of the outer connecting pipe (5) is connected to the upper opening of the second output hole (11); The specific structure of the automatic regulation mechanism (13) includes an input hole one (131), a sliding cavity (132), a first groove (133), an output port one (134), an input port one (135), an output channel (136), an output connector (137), an input port two (138), an output port two (139), an input hole two (1310), a second groove (1311), and a slider (1312); The sliding cavity (132) is arranged inside the center of the lower side of the fixed housing (1), an input hole one (131) is provided on the upper left side of the sliding cavity (132), and the upper opening of the input hole one (131) is communicated with the lower right side of the first inner cavity (2), an input hole two (1310) is provided on the upper right side of the sliding cavity (132), and the upper opening of the input hole two (1310) is communicated with the lower left side of the second inner cavity (9); The outside of the slider (1312) is horizontally movably connected to the inside of the sliding cavity (132), a first groove (133) is provided on the left side of the slider (1312), and a second groove (1311) is provided on the right side of the slider (1312); An output port one (134) is provided on the lower right side of the first groove (133); An output port two (139) is provided at the lower left side of the groove two (1311); The output channel (136) is provided inside the lower center of the fixed housing (1). An input port one (135) is provided at the upper left side of the output channel (136), and the input port one (135) is communicated with the output port one (134). An input port two (138) is provided at the upper right side of the output channel (136), and the input port two (138) is communicated with the output port two (139). An output connector (137) is fixedly connected to the opening at the lower center of the output channel (136).

2. The multistage pump for automatically regulating pressure balance according to claim 1, wherein: The specific structure of the transmission mechanism (8) includes a driven gear one (81), a connection key one (82), a thrust ball bearing (83), a driven gear two (84), a connection key two (85), and a driving gear two (86); The inside of the center of the driving gear two (86) is fixedly connected to the outside of the lower output shaft of the motor one (7); The driven gear one (81) is movably connected to the inside of the left center of the fixed housing (1). The upper right tooth part of the driven gear one (81) is connected to the lower left tooth part of the driving gear two (86). The inside of the center of the driven gear one (81) is movably connected to the outside of the right side of the transmission shaft one (3) through several connection keys one (82); The driven gear two (84) is movably connected to the inside of the right center of the fixed housing (1). The upper left side of the driven gear two (84) is connected to the lower right side of the driving gear two (86). The inside of the driven gear two (84) is movably connected to the outside of the left side of the transmission shaft two (12) through several connection keys two (85); The thrust ball bearing (83) is movably connected to the inside of the center of the fixed housing (1). The left side of the thrust ball bearing (83) is connected to the right end of the transmission shaft one (3), and the right side of the thrust ball bearing (83) is connected to the left end of the transmission shaft two (12).

3. The multistage pump for automatically regulating pressure balance according to claim 2, wherein: The slider (1312) is rectangular.

4. The multistage pump for automatically regulating pressure balance according to claim 3, wherein: An arc-shaped flow guiding surface is provided at the upper right corner of the groove one (133).

5. The multistage pump for automatically regulating pressure balance according to claim 4, wherein: An arc-shaped flow guiding surface is provided at the upper left corner of the groove two (1311).

6. The multistage pump for automatically regulating pressure balance according to claim 1, characterized in that: The impeller one (6) and the impeller two (10) are symmetrically arranged.

7. An automatic pressure regulating multi-stage pump according to claim 1, characterized in that: An input connector is provided at the center of the outer connecting pipe (5).

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