Centrifugal pump

Abstract

The centrifugal pump comprises a pump body, a base, a motor, an impeller and a partition plate, a pump cavity is formed between the pump body and the base, the motor is arranged in the pump cavity, the partition plate is located above the base, and the impeller penetrates through the partition plate to be arranged in the base. And the partition plate and the motor are configured to partially cover the base.

Description

Technical Field

[0001] The present disclosure relates to the field of water pumps, and in particular, to a centrifugal pump. Background Art

[0002] Centrifugal pumps transport liquids through the centrifugal force generated by the rotation of the impeller. When the centrifugal pump is running, the high-speed rotation of the impeller drives the liquid to rotate, and the liquid is thrown into the pump body at high speed, and finally the liquid is transported to the pump outlet at a higher pressure. There is an air blockage phenomenon in the current centrifugal pumps, and the air in the pump cannot be discharged, which will cause the pump to fail to transport liquids normally. Summary of the invention

[0003] In order to solve at least part of the above problems, the present disclosure provides a centrifugal pump, comprising: a pump body, a base, a motor, an impeller and a partition, wherein a pump chamber is formed between the pump body and the base, the motor is arranged in the pump chamber, the partition is located above the base, the partition is detachably connected to the base, and the impeller is arranged in the base through the partition.

[0004] In one implementation of this embodiment, a liquid inlet is provided at the bottom of the base, a liquid outlet is provided at the side of the pump body, and an open groove is provided at the side of the base.

[0005] In one implementation of this embodiment, the open groove is communicated with the liquid outlet, and the partition covers at least a portion of the open groove.

[0006] In one implementation of this embodiment, the base is in the shape of a volute.

[0007] In one implementation of this embodiment, the partition is an annular structure, and the partition includes a body, and the body extends along the radial direction of the pump body.

[0008] In one implementation of this embodiment, the partition further includes a protruding ring, which is located on a side of the body facing the motor and extends along the axial direction of the body and toward the motor.

[0009] In one implementation of this embodiment, ribs are provided between the body and the protruding ring.

[0010] In one implementation of this embodiment, the ratio of the projection area of ​​the partition and the motor on the base to the flow channel cavity area of ​​the base is greater than 2 / 3.

[0011] In one implementation of this embodiment, an exhaust hole is provided above the pump body.

[0012] In one implementation of this embodiment, a filter bottom plate is further included, and the filter bottom plate is installed below the base.

[0013] The centrifugal pump proposed in the present disclosure forms a pump cavity between the pump body and the base, a partition covers the top of the base, and an impeller is arranged in the base through the partition. When the centrifugal pump is started, the partition located above the base can allow liquid to enter the pump cavity from the unsealed area above the base, and prevent a large amount of liquid from entering the pump cavity to form a vortex, thereby avoiding air blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Other features and advantages of the present disclosure will be better understood through the following preferred embodiments described in detail in conjunction with the accompanying drawings, in which:

[0015] Figure 1 A perspective exploded schematic diagram of an exemplary centrifugal pump according to an embodiment of the present disclosure is shown.

[0016] Figure 2 A partial cross-sectional view of an exemplary centrifugal pump according to an embodiment of the present disclosure is shown.

[0017] Figure 3a A partial cross-sectional view of an exemplary centrifugal pump without a diaphragm according to an embodiment of the present disclosure is shown.

[0018] Figure 3b A partial cross-sectional view of an exemplary centrifugal pump with a diaphragm according to an embodiment of the present disclosure is shown.

[0019] Figure 4 A top view of an exemplary separator according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0020] The technical solution of the present disclosure is further specifically described below through examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present disclosure with reference to the accompanying drawings is intended to explain the overall inventive concept of the present disclosure and should not be construed as a limitation of the present disclosure.

[0021] The terms "including", "comprising" and similar terms used herein should be understood as open terms, i.e., "including / including but not limited to", indicating that other contents may also be included. The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment", and so on.

[0022] In a centrifugal pump, liquid enters the pump chamber from the inlet. When the liquid flows from the center of the impeller to the outer edge, a certain vacuum is formed in the center of the impeller. Since the pressure above the liquid surface in the pump chamber is greater than the pressure at the liquid inlet, the liquid will be continuously pressed into the impeller. As long as the impeller keeps rotating, the liquid will be continuously sucked in and discharged. However, in some cases, due to the high speed of the impeller, a large vortex will be formed in the pump. When the vortex develops to a certain extent, especially when the flow layer height is insufficient, the vortex will entrain a large amount of air above to enter the impeller. Since the air density is lower than the liquid density, the centrifugal force generated is small and cannot be discharged from the liquid outlet with the water flow. This makes the low pressure in the center of the impeller insufficient, and the liquid below the pump cannot be sucked into the pump under the action of pressure, which will cause the pump to fail to work properly.

[0023] To solve this problem, the present disclosure proposes a centrifugal pump, including a pump body, a base, a motor, an impeller and a partition, wherein a pump chamber is formed between the pump body and the base, the motor is arranged in the pump chamber, the partition covers the top of the base, and the impeller is arranged in the base through the partition.

[0024] like Figure 1-2 As shown, one embodiment of the present disclosure provides an exemplary centrifugal pump 100. Figure 1 is a perspective exploded view of the centrifugal pump 100. Figure 2 It is a partial cross-sectional view of a centrifugal pump 100. The centrifugal pump 100 includes a pump body 101, a base 102, a motor 103, an impeller 104 and a partition 105. The centrifugal pump 100 is a vertical pump, and a pump cavity is formed between the pump body 101 and the base 102, and components such as the motor 103 and the impeller 104 are located in the pump cavity. The output end of the motor 103 is connected to a pump shaft, and the lower part of the pump shaft is connected to the impeller 104. The partition 105 is located above the base 102. In addition, the partition 105 and the base 102 are semi-enclosed, that is, the partition 105 and the motor 103 partially cover the base 102. A flow channel cavity is provided in the base 102, and the middle of the partition 105 is a hollow structure. The impeller 104 passes through the partition 105 and is arranged in the flow channel cavity of the base 102.

[0025] When the centrifugal pump is started, the impeller rotates at high speed in the flow channel cavity. The partition located above the base 102 prevents the liquid entering the centrifugal pump from directly impacting the pump cavity, and allows the liquid to enter the pump cavity from the unsealed area above the base and gradually fill the pump cavity. The setting of the partition can prevent a large amount of liquid from entering the pump cavity to form a vortex at the initial stage of pump startup, thereby preventing the air in the pump cavity from being entrained to the vicinity of the impeller to avoid air blockage.

[0026] In some examples, the bottom of the base is provided with a liquid inlet 113, the side of the pump body 101 is provided with a liquid outlet 111, and the side of the base is provided with an open groove 114. The liquid enters the flow channel in the base from the liquid inlet 113 and is sent to the liquid outlet 111. In the early stage of pump startup, the open groove 114 can serve as an exhaust channel to exhaust the air between the base 102 and the partition 105.

[0027] In some examples, the open groove 114 is in communication with the liquid outlet 111 , and the partition 105 covers at least a portion of the open groove 114 . Figure 3a-Figure 3b The following are partial cross-sectional views of an exemplary centrifugal pump according to an embodiment of the present disclosure, without a partition and with a partition, wherein components such as a motor and an impeller are not shown in order to better illustrate the partition and the base. Figure 3a-Figure 3b As shown, the liquid outlet 111 is tubular. Figure 3a In the embodiment, the opening groove 114 is connected to the liquid outlet 111, and the opening groove 114 is in the same direction as the liquid outlet 111, which is conducive to the discharge of the liquid including impurities therein from the liquid outlet to avoid clogging of the opening groove. The outlet portion of the liquid outlet 111 is threaded for easy connection with an external water pipe. Figure 3b In the embodiment, the partition 105 covers the open groove 114. In some examples, the top of the open groove 114 can be partially covered by the partition 105, and when the pump is started, the liquid can enter the pump chamber through the uncovered portion of the top of the open groove 114, and the air in the pump chamber can be discharged from the liquid outlet through this area.

[0028] In some examples, the base is circular. In other examples, the base is in the shape of a volute, and the flow channel cross-sectional area of ​​the volute gradually increases as the radius increases. The high-speed liquid thrown out from the periphery of the impeller will gradually slow down, so that part of the kinetic energy is converted into static pressure energy, so that the liquid is transported to the outside of the pump at a higher pressure.

[0029] In some examples, partial coverage of the top of the base 102 can be achieved by setting the shape of the partition. For example, the partition can be an irregular shape with a missing corner at the edge. The missing corner portion can allow liquid to enter the pump chamber when the pump is started.

[0030] In some examples, the partition is an annular structure, that is, the middle of the partition is hollow for the impeller to be inserted. The partition may include a body, which may extend along the radial direction of the pump body, that is, the body is an annular plate-like structure, and the plate-like structure extends in the radial direction of the pump body. Figure 1-2 As shown, the partition may include a body 1051, the body 1051 is a hollow annular plate, and the body 1051 extends along the radial direction of the pump body. Figure 2In the figure, arrow A indicates the axial direction of the pump body, and the direction perpendicular to the axial direction of the pump body is the radial direction of the pump body. In the radial direction of the pump, the distance between the body 1051 and the motor 103 can be several millimeters. The body 1051 covers the base 102, and the two can be fixed by a threaded connector. In this example, only a detachable body needs to be added to the existing centrifugal pump, and the structure is simple.

[0031] In some examples, the diaphragm may also include a raised ring extending from the body. Figure 1-2 As shown, the protruding ring 1052 is located on the side of the body 1051 facing the motor 103, and the protruding ring 1052 extends along the body and toward the motor 103. Figure 2 In the embodiment, the height of the protruding ring can exceed the end of the motor 103. In order to better cover the top of the base 102, the protruding ring 1052 can be adapted to a centrifugal pump with a lower height of the base 102.

[0032] Figure 4 A top view of the partition 105 is shown. Figure 4 As shown, ribs 1053 are provided between the body 1051 of the partition 105 and the protruding ring 1052. The ribs 1053 are evenly arranged around the protruding ring 1052. The ribs 1053 support the protruding ring 1052 to increase the strength of the partition 105. In addition, a threaded hole 1055 is provided on the body 1051 to be threadedly connected with the base 102.

[0033] exist Figure 4 In the example of FIG. 1 , the body 1051 is also shown to include a protrusion 1054. The protrusion 1054 can partially cover the top of the opening groove 114 of the base 102. The shape of the protrusion 1054 can be changed, for example, the shape or size of the protrusion 1054 extending on the body 1051 can be changed to change the size of the coverage. In some examples, the protrusion 1054 and the opening groove 114 can be near the liquid outlet on the pump body 101.

[0034] The partition 105 partially covers the base 102, that is, partially covers the flow channel cavity of the base 102. In some examples, the projection area of ​​the partition 105 and the motor 103 on the base 102 accounts for more than 2 / 3 of the flow channel cavity area of ​​the base. Such a setting can better block the formation of vortices when the pump is started. The size of the uncovered area of ​​the flow channel cavity can be achieved by the size or shape of the partition, especially the protrusion 1054 of the partition.

[0035] In some examples, the pump body is provided with a vent hole. Figure 2, the exhaust hole 112 is located in the upper part of the pump cavity in the pump body 101. When the pump is started, the air above the liquid level in the pump cavity can be discharged to the outside of the pump through the exhaust hole 112. The exhaust hole 112 is used to quickly remove the air in the pump and the pipeline to ensure the normal operation of the pump. Since air usually floats up and accumulates to a high place in the pipeline, in order to effectively remove the air, the exhaust hole 112 can be set at a higher position (such as the middle or top of the pump body). In some examples, the exhaust hole 112 can be in a normally open state, which is convenient for equipment exhaust and reduces the user's operating steps.

[0036] Now back to Figure 1 The centrifugal pump 100 also includes other components, such as a filter base plate 109 located below the base 102. The filter base plate 109 is provided with, for example, four screw through holes, and the four screw fasteners can pass through the through holes to fix the filter base plate 109 to the pump body 101, thereby ensuring that during the operation of the pump, the liquid entering the pump does not contain too many large particles of impurities, and ensuring that the impeller 104 is not stuck. A sealing ring 110 is also provided between the base 102 and the pump body 101 for radially sealing the pump body. In some examples, the sealing ring 110 can have any suitable cross-sectional shape, including but not limited to a circle or a rectangle.

[0037] The centrifugal pump 100 further includes a cable assembly 107, which is used to supply power to the motor 103 and provide grounding protection for the motor 103. A capacitor 108 is also provided above the motor 103.

[0038] The centrifugal pump further includes a pump cover 106, and threaded holes are provided on the pump cover 106 and the pump body 101, and the two are connected by threaded fasteners. The cable assembly 107 passes through the pump cover 106 and is connected to the motor 103. In some other examples, the connection between the pump cover and the pump body can be welding or adhesive connection. In some examples, a sealing ring can be provided between the motor and the pump cover to ensure that the motor assembly inside the pump is dry to avoid electrical hazards.

[0039] The above description is only an optional embodiment of the embodiment of the present disclosure, and is not intended to limit the embodiment of the present disclosure. For those skilled in the art, the embodiment of the present disclosure may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiment of the present disclosure shall be included in the protection of the embodiment of the present disclosure.

[0040] Although the embodiments of the present disclosure have been described with reference to several specific embodiments, it should be understood that the embodiments of the present disclosure are not limited to the specific embodiments disclosed. The embodiments of the present disclosure are intended to cover various modifications and equivalent arrangements included in the spirit and scope of the appended claims. The scope of the appended claims is consistent with the broadest interpretation, thereby including all such modifications and equivalent structures and functions.

Claims

1. A centrifugal pump, characterized in that: include: A pump body, a base, a motor, an impeller and a partition, wherein a pump cavity is formed between the pump body and the base, the motor is arranged in the pump cavity, the partition is located above the base, the impeller passes through the partition and is arranged in the base, and the partition and the motor are configured to partially cover the base.

2. The centrifugal pump according to claim 1, characterized in that: The bottom of the base is provided with a liquid inlet, the side of the pump body is provided with a liquid outlet, and the side of the base is provided with an open groove.

3. The centrifugal pump according to claim 2, characterized in that: The open groove is communicated with the liquid outlet, and the partition covers at least a portion of the open groove.

4. The centrifugal pump according to claim 1, characterized in that: The base is in the shape of a volute.

5. The centrifugal pump according to claim 3, characterized in that: The partition is an annular structure and comprises a body, and the body extends along the radial direction of the pump body.

6. The centrifugal pump according to claim 5, characterized in that The partition further includes a protruding ring, which is located on a side of the body facing the motor and extends along the body toward the motor.

7. The centrifugal pump according to claim 6, characterized in that Ribs are arranged between the body and the protruding ring.

8. The centrifugal pump according to claim 1, characterized in that: The ratio of the projection area of ​​the partition and the motor on the base to the flow channel cavity area of ​​the base is greater than 2 / 3.

9. The centrifugal pump according to claim 1, characterized in that: An exhaust hole is arranged above the pump body.

10. The centrifugal pump according to claim 1, characterized in that It also includes a filter bottom plate, which is installed below the base.

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