A semi-double volute open pump

Abstract

This utility model discloses a semi-double volute split-case pump, relating to the field of water pumps. It includes a pump body, a pump cover, a split surface, and a baffle plate. The pump cover is installed on the split surface of the pump body, forming a pressure chamber between the pump body and the pump cover. The pressure chamber adopts a semi-double volute structure. A baffle plate and a tongue are provided within the pressure chamber. The baffle plate divides the pressure chamber into two flow channels, and the starting point of the baffle plate is lower than the split surface. A pressure chamber diffuser section is provided at the end of the pressure chamber, with the baffle plate extending into the diffuser section. The central angle formed by the starting point of the baffle plate and the tongue is less than 180°. This utility model uses a semi-double volute structure to reduce hydraulic losses in the pressure chamber, improve pump efficiency, and simultaneously reduce the radial hydraulic force during pump operation under unbalanced conditions.

Description

Technical Field

[0001] This utility model relates to the field of water pumps, specifically to a semi-double volute split-case pump. Background Technology

[0002] The plenum chamber of a split-case pump (single-stage double-suction split-case pump) typically employs a spiral volute hydraulic structure. To minimize the radial hydraulic force during off-center operation, a double volute structure is generally used to improve pump operational stability. Figure 1 As shown. However, the double-volute structure has an efficiency 1%~1.5% lower than the single-volute structure under optimal operating conditions. Furthermore, because the volute is radially split, the diaphragm A (4') of the double volute is cast separately on the pump body A (1') and pump cover A (2'), located on the upper and lower sides of the split face A (3'), resulting in inaccurate alignment after machining, thus affecting hydraulic performance. In addition, the starting point A (5') of the diaphragm is higher than the split face A, and the central angle between the starting point A of the diaphragm and the tongue A (6') is not less than 180°. In actual production, the double-volute pressure chamber of the split-case pump must effectively reduce the radial hydraulic force while maximizing hydraulic performance. Therefore, it is necessary to improve the existing split-case pump structure. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a semi-double volute split-case pump. The semi-double volute structure reduces the hydraulic loss in the pressure chamber, improves the pump efficiency, and reduces the hydraulic radial force when the pump is operating under off-center conditions.

[0004] The purpose of this utility model is achieved through the following technical solution: This semi-double volute split pump includes a pump body, a pump cover, a split surface, and a partition. The pump cover is installed on the split surface of the pump body, and a pressure chamber is formed between the pump body and the pump cover. The pressure chamber adopts a semi-double volute structure. A partition and a tongue are provided in the pressure chamber. The partition divides the pressure chamber into two flow channels, and the starting point of the partition is lower than the split surface. A pressure chamber diffuser section is provided at the end of the pressure chamber. The partition extends into the pressure chamber diffuser section, and the central angle formed by the starting point of the partition and the tongue is less than 180°.

[0005] As a further technical solution, the dual channels are distributed in a non-circular symmetrical manner.

[0006] The beneficial effects of this utility model are as follows: 1. The pressure chamber adopts a semi-double volute structure, which can effectively reduce the hydraulic loss of the pressure chamber, improve the pump efficiency, and at the same time reduce the hydraulic radial force when the pump is operating under off-center conditions. 2. The dual flow channels divided by the baffle in the pressure chamber are not circumferentially symmetrically distributed, so that the baffle does not need to be cast separately on the pump body and pump cover. The baffle is only cast in the pump body and will not affect the hydraulic performance due to misalignment. The starting point of the baffle is lower than the center opening, the baffle extends into the diffuser section of the pressure chamber, and the central angle formed by the starting point of the baffle and the baffle tongue is less than 180°. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the existing technology.

[0008] Figure 2 This is a schematic diagram of the structure of this utility model.

[0009] Explanation of reference numerals in the attached drawings: Pump body A1', Pump cover A2', Open face A3', Partition plate A4', Partition plate starting point A5', Partition tongue A6'; 1. Pump body; 2. Pump cover; 3. Center opening; 4. Baffle; 5. Baffle starting point; 6. Diffusion section of pressure chamber; 7. Detailed Implementation

[0010] The present invention will now be described in detail with reference to the accompanying drawings: Example: As attached Figure 2 As shown, this semi-double volute split pump includes a pump body 1, a pump cover 2, a split surface 3, a partition 4, a partition start point 5, a partition tongue 6, and a pressure chamber diffuser section 7.

[0011] A pump cover 2 is installed on the split surface 3 of the pump body 1, forming a pressure chamber between the pump body 1 and the pump cover 2 (inner cavity). This pressure chamber adopts a semi-double volute structure, and a baffle 4 and a tongue 6 are installed inside the pressure chamber. The baffle 4 divides the pressure chamber into two flow channels. Preferably, the starting point 5 of the baffle 4 is lower than the split surface 3, and a pressure chamber diffuser section 7 is provided at the end of the pressure chamber. At the same time, the baffle 4 extends into the pressure chamber diffuser section 7, and the central angle (wrapping angle) formed by the starting point 5 of the baffle and the tongue 6 is less than 180°. This means that the baffle 4 does not need to be cast separately on the pump body 1 and the pump cover 2. The baffle 4 is cast only inside the pump body 1, and the hydraulic performance will not be affected by misalignment.

[0012] Furthermore, the dual flow channels in the pressure chamber are non-circularly symmetrically distributed.

[0013] The working principle of this utility model: like Figure 1 , 2As shown, compared to the prior art, in this utility model, the starting point 5 of the baffle is set lower than the center opening 3, and the central angle formed by the starting point 5 of the baffle and the tongue 6 is less than 180°. This means that the baffle 4 does not need to be cast separately on the pump body 1 and the pump cover 2. The baffle 4 is cast only inside the pump body 1, and the hydraulic performance will not be affected by misalignment. In addition, the pressure chamber adopts a semi-double volute structure, and the baffle 4 divides the pressure chamber into two flow channels. The two flow channels are non-circularly symmetrically distributed, which can effectively reduce the hydraulic loss of the pressure chamber, improve the pump efficiency, and reduce the hydraulic radial force when the pump is operating under off-center conditions.

[0014] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this utility model should fall within the protection scope of the appended claims.

Claims

1. A semi-double volute split-case pump, characterized in that: The pump includes a pump body (1), a pump cover (2), a split surface (3), and a partition (4). The pump cover (2) is installed on the split surface (3) of the pump body (1). A water pressure chamber is formed between the pump body (1) and the pump cover (2). The water pressure chamber adopts a semi-double volute structure. A partition (4) and a tongue (6) are provided in the water pressure chamber. The partition (4) divides the water pressure chamber into two channels. The starting point (5) of the partition (4) is lower than the split surface (3). A water pressure chamber diffuser section (7) is provided at the end of the water pressure chamber. The partition (4) extends into the water pressure chamber diffuser section (7). The central angle formed by the starting point (5) of the partition and the tongue (6) is less than 180°.

2. The semi-double volute split-case pump according to claim 1, characterized in that: The dual flow channels are non-circularly symmetrically distributed.

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