Pump body and submersible pump

Abstract

This utility model discloses a pump body and a submersible sewage pump. The pump body includes a pump casing, an impeller, a wear ring, and a sealing ring. The impeller is disposed inside the pump casing. The wear ring is located at the inlet end of the impeller. The sealing ring is located between the outer circumference of the wear ring and the inner circumference of the inlet end of the pump casing, with a gap between the sealing ring and the wear ring. A helical groove is formed on the outer circumference of the wear ring, and the direction of rotation of the helical groove is opposite to the direction of rotation of the impeller. This utility model can reduce the volume loss of the pump body and improve the operating efficiency of the pump body.

Description

Technical Field

[0001] This utility model relates to the field of submersible sewage pump technology, and in particular to a pump body and a submersible sewage pump. Background Technology

[0002] Submersible sewage pumps are electromechanical devices that integrate the motor and pump into a single unit and operate continuously underwater. They are widely used in municipal drainage, industrial wastewater discharge, and domestic sewage lifting. These pumps commonly face challenges when conveying media containing numerous impurities, large particles, easy blockage of the flow channel, and complex operating conditions. Therefore, higher requirements are placed on the impeller structure, the sealing performance of the hydraulic components, and their wear resistance.

[0003] In traditional submersible sewage pumps, a wear ring is typically installed between the impeller and the pump body to restrict the backflow of high-pressure liquid to the low-pressure side. However, since submersible sewage pumps often operate in media with high solids content and high abrasiveness, the gap between the impeller wear ring and the pump body wear ring inevitably increases after long-term wear. This makes it easier for high-pressure liquid on the impeller outlet side to leak back to the impeller inlet side, resulting in significant volume loss and affecting the pump's hydraulic efficiency. Utility Model Content

[0004] The primary objective of this invention is to provide a pump body that improves efficiency.

[0005] Another objective of this invention is to provide a submersible sewage pump that uses the above-described pump body.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A pump body includes a pump casing, an impeller, a mouth ring, and a sealing ring. The impeller is disposed inside the pump casing, the mouth ring is disposed at the inlet end of the impeller, and the sealing ring is disposed between the outer periphery of the mouth ring and the inner periphery of the inlet end of the pump casing, with a gap between the sealing ring and the mouth ring. A helical groove is formed on the outer periphery of the mouth ring, and the rotation direction of the helical groove of the mouth ring is opposite to the rotation direction of the impeller.

[0007] Preferably, the pump body further includes a fixing member, and the inlet ring is detachably connected to the inlet end of the impeller via the fixing member.

[0008] Preferably, the impeller inlet end has a flange portion along its outer periphery, and the inlet ring near one end of the impeller has a mounting portion along its outer periphery, the mounting portion being connected to the flange portion via the fastener.

[0009] Preferably, the fixing member is a fixing bolt, and a plurality of fixing bolts are provided circumferentially between the mounting part and the flange part.

[0010] Preferably, a limiting groove is provided on the side of the flange facing the mounting part, and a limiting protrusion is provided on the mounting part corresponding to the position of the limiting groove, the limiting protrusion being adapted to be embedded in the limiting groove.

[0011] Preferably, the inner circumference of the inlet end of the pump casing is provided with a support step, and the sealing ring abuts against the support step.

[0012] Preferably, the outer circumference of the mouth ring is provided with multiple spiral grooves spaced apart along the axial direction.

[0013] This utility model also relates to a submersible sewage pump, including a motor housing, a drive motor and the pump body. The motor housing is fixedly connected to the pump housing, the drive motor is disposed inside the motor housing, and the output shaft of the drive motor extends into the pump housing and is connected to the impeller.

[0014] Compared with the prior art, the pump body of this utility model embodiment has the following advantages: In this invention, a sealing ring is provided between the outer circumference of the inlet ring and the inner circumference of the inlet end of the pump casing, and a small gap exists between the inlet ring and the sealing ring. This causes the pressure leaking from the outlet end of the impeller to the inlet end of the impeller to gradually decrease along the inlet ring of the impeller. At the same time, since the spiral groove of the inlet ring rotates in the opposite direction to the spiral groove of the impeller, the liquid at the inlet end of the pump casing generates a pressure in the pump body when it passes through the spiral groove on the inlet ring. This pressure partially balances the pressure in the pump body, thereby reducing the leakage from the outlet end of the impeller to the inlet end of the impeller, thus reducing the volume loss of the pump body and improving the operating efficiency of the pump body. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a submersible sewage pump according to an embodiment of the present utility model; Figure 2 yes Figure 1 Enlarged view of point A in the image; Figure 3 This is a half-sectional schematic diagram of the mouth ring according to an embodiment of the present utility model.

[0016] In the figure, 1 is the pump casing; 11 is the support step; 2 is the impeller; 21 is the flange; 22 is the limiting groove; 3 is the mouth ring; 31 is the spiral groove; 32 is the mounting part; 33 is the limiting protrusion; 4 is the sealing ring; 5 is the fastener; 6 is the motor housing; and 7 is the drive motor. Detailed Implementation

[0017] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0018] In the description of this utility model, it should be understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, parts, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts, components, and / or groups thereof. It should be understood that when we say a part is "connected" to another part, it can be directly connected to the other part, or there may be intermediate parts. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0019] like Figures 1 to 3 As shown, this utility model relates to a pump body, including a pump casing 1, an impeller 2, a mouth ring 3, and a sealing ring 4. The impeller 2 is disposed inside the pump casing 1, the mouth ring 3 is disposed at the inlet end of the impeller 2, and the sealing ring 4 is disposed between the outer periphery of the mouth ring 3 and the inner periphery of the inlet end of the pump casing 1, with a gap between the sealing ring 4 and the mouth ring 3. A spiral groove 31 is formed on the outer periphery of the mouth ring 3, and the spiral direction of the spiral groove 31 of the mouth ring 3 is opposite to the spiral direction of the impeller 2.

[0020] In this invention, a sealing ring 4 is provided between the outer circumference of the inlet ring 3 and the inner circumference of the inlet end of the pump casing 1, and a small gap exists between the inlet ring 3 and the sealing ring 4. This causes the pressure leaking from the outlet end of the impeller 2 to the inlet end of the impeller 2 to gradually decrease along the inlet ring 3 of the impeller 2. At the same time, since the rotation direction of the spiral groove 31 of the inlet ring 3 is opposite to that of the impeller 2, the liquid at the inlet end of the pump casing 1 generates a pressure in the pump body when it passes through the spiral groove 31 on the inlet ring 3. This pressure is partially balanced with the pressure in the pump body, thereby reducing the leakage from the outlet end of the impeller 2 to the inlet end of the impeller 2, thus reducing the volume loss of the pump body and improving the operating efficiency of the pump body.

[0021] In this embodiment, the pump body further includes a fixing member 5. The inlet ring 3 is detachably connected to the inlet end of the impeller 2 through the fixing member 5, thereby realizing the fixed connection between the inlet ring 3 and the impeller 2, and also facilitating the maintenance and replacement of the inlet ring 3 in the future.

[0022] In this embodiment, the impeller 2 has a flange 21 circumferentially arranged on the outer periphery of the inlet end, and the mouth ring 3 has a mounting part 32 circumferentially arranged on the outer periphery of the end near the impeller 2. The mounting part 32 is connected to the flange 21 through the fastener 5.

[0023] That is, by having the flange 21 extending from the outer periphery of the inlet end of the impeller 2 and the mounting portion 32 extending from the outer periphery of the end of the mouth ring 3, it is convenient for the mounting portion 32 and the flange 21 to be connected through the fastener 5, and for the mouth ring 3 to be connected to the impeller 2 together.

[0024] Specifically, the fixing member 5 is a fixing bolt, and a plurality of fixing bolts are provided circumferentially between the mounting part 32 and the flange part 21 to ensure a stable connection between the mouth ring 3 and the impeller 2.

[0025] In this embodiment, a limiting groove 22 is provided on the side of the flange portion 21 facing the mounting portion 32, and a limiting protrusion 33 is provided on the mounting portion 32 corresponding to the position of the limiting groove 22. The limiting protrusion 33 is adapted to be embedded in the limiting groove 22.

[0026] By fitting the limiting protrusion 33 into the limiting groove 22, the positioning and fixing of the mouth ring 3 and the impeller 2 can be facilitated, thereby enhancing the stability of the connection between the mouth ring 3 and the impeller 2.

[0027] In this embodiment, a support step 11 is provided on the inner circumference of the inlet end of the pump housing 1, and the sealing ring 4 abuts against the support step 11, thereby preventing the sealing ring 4 from coming out of the inlet end of the pump housing 1.

[0028] In this embodiment, the outer periphery of the mouth ring 3 is provided with multiple spiral grooves 31 spaced axially to generate pressure balance with the pressure inside the pump body, reduce leakage, and improve operating efficiency.

[0029] This utility model also relates to a submersible sewage pump, including a motor housing 6, a drive motor 7 and the pump body. The motor housing 6 is fixedly connected to the pump housing 1. The drive motor 7 is disposed inside the motor housing 6. The output shaft of the drive motor 7 extends into the pump housing 1 and is connected to the impeller 2.

[0030] In this invention, the submersible sewage pump utilizes the pump body, which improves the pump's operating efficiency and enhances its practicality.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A pump body, characterized in that, The pump includes a pump casing, an impeller, a mouth ring, and a sealing ring. The impeller is disposed inside the pump casing. The mouth ring is disposed at the inlet end of the impeller. The sealing ring is disposed between the outer circumference of the mouth ring and the inner circumference of the inlet end of the pump casing, and there is a gap between the sealing ring and the mouth ring. The outer circumference of the mouth ring has a helical groove, and the direction of rotation of the helical groove of the mouth ring is opposite to the direction of rotation of the impeller.

2. The pump body according to claim 1, characterized in that, It also includes a fixing component, through which the mouth ring is detachably connected to the inlet end of the impeller.

3. The pump body according to claim 2, characterized in that, The impeller inlet end is provided with a flange portion along its outer periphery, and the inlet ring near one end of the impeller is provided with a mounting portion along its outer periphery. The mounting portion and the flange portion are connected by the fastener.

4. The pump body according to claim 3, characterized in that, The fastener is a fixing bolt, and a plurality of fixing bolts are provided circumferentially between the mounting part and the flange part.

5. The pump body according to claim 3, characterized in that, A limiting groove is provided on the side of the flange facing the mounting part, and a limiting protrusion is provided on the mounting part corresponding to the position of the limiting groove. The limiting protrusion is adapted to be embedded in the limiting groove.

6. The pump body according to claim 1, characterized in that, The pump casing has a support step on its inner circumference at the inlet end, and the sealing ring abuts against the support step.

7. The pump body according to claim 1, characterized in that, The outer circumference of the mouth ring is provided with multiple spiral grooves spaced axially.

8. A submersible sewage pump, characterized in that, The device includes a motor housing, a drive motor, and a pump body as described in any one of claims 1-7. The motor housing is fixedly connected to the pump housing, the drive motor is disposed inside the motor housing, and the output shaft of the drive motor extends into the pump housing and is connected to the impeller.

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