Water pump adopting double-output-shaft motor

Abstract

The invention provides a water pump adopting a double-output-shaft motor, and belongs to the technical field of water pump instruments. The problem that the axial force load of an existing motor shaft is large is solved. The water pump adopting the double-output-shaft motor comprises a centrifugal pump body and the motor, a sealing cavity used for containing the motor is formed in the centrifugal pump body, the motor is provided with a first output shaft and a second output shaft, the directions of the first output shaft and the second output shaft are opposite, and the centrifugal pump body is provided with a water inlet, a water outlet, a first impeller set and a second impeller set. The first impeller set is arranged on the first output shaft, the second impeller set is arranged on the second output shaft, the first impeller set is used for guiding liquid at the water inlet to the second impeller set, and the second impeller set is used for guiding the liquid from the first impeller set to the water outlet. The axial force problem of the output shaft of the water pump motor is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of water pump equipment, and in particular relates to a water pump using a double-output shaft motor. Background Art

[0002] Centrifugal pumps use the centrifugal force generated by the rotation of the impeller to transport liquids, and are suitable for a variety of fluid transportation needs. Single-stage centrifugal pumps have a simple structure and are suitable for low-head occasions; multi-stage centrifugal pumps can achieve high heads and large flows through multiple impellers in series, while maintaining high efficiency and a wide operating range. Centrifugal pumps have a compact multi-stage design and strong adaptability, and are widely used in high-rise water supply, industrial processes, and fire protection systems.

[0003] The axial force is an important research topic that needs to be tackled in the field of centrifugal pumps. The imbalance of the axial force will lead to serious consequences such as increased bearing wear, thus affecting the normal operation of the pump. When the pump is running, the axial force acts on the rotor, which will pull the rotor to move axially. Therefore, it is necessary to find a way to eliminate or balance this axial force in order to make the pump work normally. Summary of the invention

[0004] The purpose of the present invention is to provide a water pump using a dual output shaft motor in order to solve the above problems existing in the prior art.

[0005] The objectives of the present invention can be achieved through the following technical solutions: A water pump using a dual-output shaft motor includes a centrifugal pump body and a motor, the centrifugal pump body is provided with a sealed chamber for accommodating the power supply motor, the motor is provided with a first output shaft and a second output shaft, the first output shaft and the second output shaft are in opposite directions, the centrifugal pump body is provided with a water inlet, a water outlet, a first impeller group and a second impeller group, the first impeller group is arranged on the first output shaft, the second impeller group is arranged on the second output shaft, the first impeller group is used to guide the liquid at the water inlet to the second impeller group, and the second impeller group is used to guide the liquid from the first impeller group to the water outlet.

[0006] The working principle of the present invention is as follows: liquid enters the centrifugal pump body from the water inlet, and is transported to the second impeller group through the rotation of the first impeller group. At the same time, the second impeller group rotates to transport the liquid from the first impeller group to the water outlet. The present application adopts a dual-axis motor and sets opposite impeller groups on the first output shaft and the second output shaft, thereby offsetting the axial force and achieving a boosting effect. The arrangement reduces the length of a single motor output shaft and reduces the pressure on the motor output shaft.

[0007] In the above-mentioned water pump using a dual-output shaft motor, each of the first impeller group and the second impeller group is provided with at least one impeller.

[0008] In the above-mentioned water pump using a dual-output shaft motor, the impellers of the first impeller group and the second impeller group are both composed of guide vane impellers.

[0009] In the above-mentioned water pump using a dual output shaft motor, when the first impeller group and the second impeller group are both provided with an impeller, the impeller of the first impeller group adopts a guide vane impeller, and the second impeller group adopts a volute impeller; when the first impeller group and the second impeller group are both provided with at least two impellers, the multiple impellers of the first impeller group all adopt guide vane impellers, and the second impeller group includes a volute impeller and at least one guide vane impeller.

[0010] In the above-mentioned water pump using a dual-output shaft motor, the volute impeller is arranged at one end close to the sealing chamber, and the cross-sectional shape of the volute impeller is a spiral involute.

[0011] In the above-mentioned water pump using a dual output shaft motor, the centrifugal pump body includes a first pump cover, a second pump cover, a first pump casing and a second pump casing. The first pump cover is used to seal the first pump casing, and the second pump cover is used to seal the second pump casing. The first pump casing is used to install the power motor and the first impeller group, and the second pump casing is used to install the second impeller group.

[0012] In the above-mentioned water pump using a dual-output shaft motor, the water inlet is arranged on the first pump cover, the water outlet is arranged on the side wall of the second pump casing, and the water outlet is located near one end of the first pump casing.

[0013] In the above-mentioned water pump using a dual output shaft motor, a first water flow channel is formed between the sealing cavity and the first pump casing, a plurality of connecting columns are arranged in the first water flow channel, the second impeller group cooperates with the second pump casing and the second pump cover to form a second water flow channel, the first water flow channel is connected to the second water flow channel, the first water flow channel is used to direct the liquid located in the first impeller group to flow to the second water flow channel, and the second water flow channel is used to direct water to the second impeller group.

[0014] In the above-mentioned water pump using a dual output shaft motor, the second pump housing is provided with a support block for supporting the second impeller assembly, and the support column is provided with a plurality of through holes, which are used to connect the first water flow channel and the second water flow channel.

[0015] In the above-mentioned water pump using a dual-output shaft motor, a connecting pipe is further provided on the supporting block, and the connecting pipe is used to connect the second impeller assembly and the water outlet.

[0016] Compared with the prior art, the present invention has the advantage of solving the problem of axial force of the output shaft of the water pump motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a multi-stage guide vane impeller adopted in the present invention.

[0018] Figure 2 It is a schematic cross-sectional structure diagram of a multi-stage guide vane impeller adopted in the present invention.

[0019] Figure 3 It is a schematic diagram of the structure of the multi-stage volute impeller adopted in the present invention.

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of a multi-stage volute impeller adopted in the present invention.

[0021] Figure 5 It is a schematic cross-sectional structure diagram of a single-stage guide vane impeller adopted in the present invention.

[0022] Figure 6 The figure is a schematic diagram of the cross-sectional structure of a single-stage volute impeller adopted in the present invention.

[0023] Figure 7 It is a schematic structural diagram of the first pump casing of the present invention.

[0024] Figure 8 It is a structural schematic diagram of the second pump casing of the present invention.

[0025] Fig. 9 It is a schematic diagram of the cross-sectional structure of the volute impeller of the present invention.

[0026] In the figure, 1. centrifugal pump body; 2. motor; 3. sealing chamber; 4. first output shaft; 5. second output shaft; 6. water inlet; 7. water outlet; 8. first impeller group; 9. second impeller group; 10. guide vane impeller; 11. volute impeller; 12. first pump cover; 13. second pump cover; 14. first pump casing; 15. second pump casing; 16. first water flow channel; 17. second water flow channel; 18. connecting column; 19. support block; 20. through hole; 21. connecting pipe. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0028] like Figure 1-Figure 9As shown, the water pump using a dual-output shaft motor includes a centrifugal pump body 1 and a motor 2. A sealed chamber 3 for accommodating the motor 2 is provided in the centrifugal pump body. The motor 2 is provided with a first output shaft 4 and a second output shaft 5. The first output shaft 4 and the second output shaft 5 are in opposite directions. The centrifugal pump body 1 is provided with a water inlet 6, a water outlet 7, a first impeller group 8 and a second impeller group 9. The first impeller group 8 is arranged on the first output shaft 4, and the second impeller group 9 is arranged on the second output shaft 5. The first impeller group 8 is used to guide the liquid at the water inlet 6 to the second impeller group 9, and the second impeller group 9 is used to guide the liquid from the first impeller group 8 to the water outlet 7.

[0029] To further elaborate, the first impeller group 8 and the second impeller group 9 are each provided with at least one impeller, and the number of the first impeller group 8 and the second impeller group 9 is the same, which is used to ensure that the axial forces at both ends can offset each other. At the same time, providing multiple impellers can improve the head capacity and improve the efficiency.

[0030] To elaborate further, the impellers of the first impeller group 8 and the second impeller group 9 are both composed of guide vane impellers 10. The guide vane impellers 10 are suitable for low head and high flow conditions, such as drainage and cooling water circulation fields, and have the advantage of energy saving.

[0031] To further elaborate, when the first impeller group 8 and the second impeller group 9 are both provided with an impeller, the impeller of the first impeller group 8 adopts a guide vane impeller 10, and the second impeller group 9 adopts a volute impeller 11. When the first impeller group 8 and the second impeller group 9 are both provided with at least two impellers, the multiple impellers of the first impeller group 8 all adopt guide vane impellers 10, and the second impeller group 9 includes a volute impeller 11 and at least one guide vane impeller 10. The volute impeller 11 is arranged at one end close to the sealing chamber 3, and the impeller closest to the water outlet 7 is modified into a turbine impeller, so that the water pump head is improved, so that the present application can be applied to medium and high head, medium and small flow conditions, such as industry, agriculture, municipal construction and other fields. The cross-sectional shape of the volute impeller 11 is a spiral involute, as shown in the attached specification for details. Fig. 9 Since most of the existing multi-stage pumps use guide vane impellers, their efficiency is not high. Therefore, we modify the last impeller into a volute impeller 11 and set the cross section into a spiral involute, so as to improve the efficiency of collecting liquid.

[0032] In further detail, the centrifugal pump body 1 includes a first pump cover 12, a second pump cover 13, a first pump casing 14 and a second pump casing 15. The first pump cover 12 is used to seal the first pump casing 14, the second pump cover 13 is used to seal the second pump casing 15, the first pump casing 14 is used to install the power machine 2 and the first impeller group 8, and the second pump casing 15 is used to install the second impeller group 9.

[0033] In further detail, the water inlet 6 is arranged on the first pump cover 12, the water outlet 7 is arranged on the side wall of the second pump casing 15, and the water outlet 7 is located near one end of the first pump casing 14. Since the first impeller group 8 and the second impeller group 9 are arranged oppositely, the output port of the second impeller group 9 is located near one end of the sealing chamber 3.

[0034] To elaborate further, a first water flow channel 16 is formed between the sealed chamber 3 and the first pump casing 14, and a plurality of connecting columns 18 are arranged in the first water flow channel 16. The second impeller group 9 cooperates with the second pump casing 15 and the second pump cover 13 to form a second water flow channel 17. The first water flow channel 16 is connected to the second water flow channel 17. The first water flow channel 16 is used to direct the liquid located in the first impeller group 8 to flow to the second water flow channel 17, and the second water flow channel 17 is used to direct the water to flow to the second impeller group 9. The liquid enters the first impeller group 8 from the water inlet 6, and enters the first water flow channel 16 under the action of the first impeller group 8, enters the second water flow channel 17 from the first water flow channel 16, and enters the second impeller group 9 from the second casing cover, and leaves from the water outlet 7 under the action of the second impeller group 9. Because the first water flow channel 16 passes through the sealed chamber 3 of the motor 2, it will take away the heat of the sealed chamber 3, so as to cool the sealed chamber 3 and prevent the motor 2 from working at high temperature for a long time.

[0035] In further detail, the second pump housing 15 is provided with a support block 19 for supporting the second impeller group 9, and a plurality of through holes 20 are provided on the support column. The through holes 20 are used to connect the first water flow channel 16 and the second water flow channel 17. The support block 19 supports the second impeller group 9 without affecting the first water flow channel 16 and the dripping water channel.

[0036] To elaborate further, a connecting pipe 21 is also provided on the support block 19, and the connecting pipe 21 is used to connect the second impeller group 9 and the water outlet 7. Since the first impeller group 8 and the second impeller group 9 are arranged oppositely, the output port of the second impeller group 9 is located close to the sealing chamber 3, so it is necessary to provide a connecting pipe 21 so that it does not affect the second water flow channel 17.

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0038] Although a large number of terms are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A water pump using a dual output shaft motor, characterized in that: The invention comprises a centrifugal pump body (1) and a motor (2), wherein a sealed cavity (3) for accommodating the motor (2) is arranged in the centrifugal pump body, and the motor (2) is provided with a first output shaft (4) and a second output shaft (5), wherein the first output shaft (4) and the second output shaft (5) are in opposite directions, and the centrifugal pump body (1) is provided with a water inlet (6), a water outlet (7), a first impeller group (8) and a second impeller group (9), wherein the first impeller group (8) is arranged on the first output shaft (4), and the second impeller group (9) is arranged on the second output shaft (5), wherein the first impeller group (8) is used to guide liquid at the water inlet (6) to the second impeller group (9), and the second impeller group (9) is used to guide liquid from the first impeller group (8) to the water outlet (7).

2. A water pump using a dual output shaft motor according to claim 1, characterized in that: The first impeller assembly (8) and the second impeller assembly (9) are each provided with at least one impeller.

3. A water pump using a dual output shaft motor according to claim 2, characterized in that: The impellers of the first impeller group (8) and the second impeller group (9) are both composed of guide vane impellers (10).

4. A water pump using a dual output shaft motor according to claim 2, characterized in that: When both the first impeller group (8) and the second impeller group (9) are provided with one impeller, the impeller of the first impeller group (8) is a guide vane impeller (10), and the second impeller group (9) is a volute impeller (11); when both the first impeller group (8) and the second impeller group (9) are provided with at least two impellers, the plurality of impellers of the first impeller group (8) are guide vane impellers (10), and the second impeller group (9) includes a volute impeller (11) and at least one guide vane impeller (10).

5. A water pump using a dual output shaft motor according to claim 4, characterized in that: The volute impeller (11) is arranged at one end close to the sealing chamber (3), and the cross-sectional shape of the volute impeller (11) is a spiral involute.

6. A water pump using a dual output shaft motor according to claim 1, characterized in that: The centrifugal pump body (1) comprises a first pump cover (12), a second pump cover (13), a first pump casing (14) and a second pump casing (15); the first pump cover (12) is used to seal the first pump casing (14); the second pump cover (13) is used to seal the second pump casing (15); the first pump casing (14) is used to install the electric motor (2) and the first impeller assembly (8); and the second pump casing (15) is used to install the second impeller assembly (9).

7. A water pump using a dual output shaft motor according to claim 6, characterized in that: The water inlet (6) is arranged on the first pump cover (12), the water outlet (7) is arranged on the side wall of the second pump casing (15), and the water outlet (7) is located close to one end of the first pump casing (14).

8. A water pump using a dual output shaft motor according to claim 6, characterized in that: A first water flow channel (16) is formed between the sealing cavity (3) and the first pump housing (14), a plurality of connecting columns (18) are arranged in the first water flow channel (16), the second impeller assembly (9) cooperates with the second pump housing (15) and the second pump cover (13) to form a second water flow channel (17), the first water flow channel (16) is connected to the second water flow channel (17), the first water flow channel (16) is used to direct liquid in the first impeller assembly (8) to flow to the second water flow channel (17), and the second water flow channel (17) is used to direct water to flow to the second impeller assembly (9).

9. A water pump using a dual output shaft motor according to claim 6, characterized in that: The second pump housing (15) is provided with a support block (19) for supporting the second impeller assembly (9), and the support column is provided with a plurality of through holes (20), and the through holes (20) are used to connect the first water flow channel (16) and the second water flow channel (17).

10. A water pump using a dual output shaft motor according to claim 6, characterized in that: The support block (19) is also provided with a communication pipe (21), and the communication pipe (21) is used to connect the second impeller assembly (9) and the water outlet (7).

Images