Double-flow-channel centrifugal pump shell

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a double-flow-channel centrifugal pump shell. The shell comprises a delivery chamber, a medium inlet is formed in one axial side of the delivery chamber and connected with an inlet flow channel, the inlet flow channel is connected with an inlet flange, a first diffusion section and a second diffusion section are arranged on the two sides of the interior of the delivery chamber and symmetrically distributed, the first diffusion section is connected with a first medium outlet, and the second diffusion section is connected with a second medium outlet. The first diffusion section is connected with a first medium outlet, the first medium outlet is provided with a first partition tongue and connected with a first outlet flow channel, the second diffusion section is connected with a second medium outlet, the second medium outlet is provided with a second partition tongue and connected with a second outlet flow channel, and the first outlet flow channel and the second outlet flow channel are connected to the same outlet flange. Through the design of the double flow channels, the radial force of the pump can be better eliminated, the operation stability of the pump is improved, the service life of the pump is prolonged, and meanwhile the requirements of places with strict installation size requirements at an inlet and an outlet of the pump can be well met.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a double-flow channel centrifugal pump casing. Background Art

[0002] The centrifugal pump works by rotating the impeller to make the water centrifugal. Before starting the water pump, the pump casing and the water suction pipe must be filled with water, and then the motor is started to make the pump shaft drive the impeller and water to rotate at high speed. The water undergoes centrifugal motion and is thrown to the outer edge of the impeller, and flows into the water pressure pipeline of the water pump through the flow channel of the volute pump casing. Conventional pump casings are as follows: Figure 1 As shown, the liquid flows out radially directly through the extrusion chamber, resulting in a larger radial dimension. It cannot be used in some places with strict interface size requirements. In addition, when the water pump is operating in a non-design operating range (non-high efficiency zone), there is a certain radial force, which can easily increase the vibration and noise of the water pump, which is not conducive to the safe and reliable operation of the water pump.

[0003] A Chinese patent with application number CN202211459287.5 discloses a volute of a double-opening centrifugal pump casing, comprising a casing body, a first flow channel opening, a second flow channel opening, a first flow channel plate, a second flow channel plate and a water inlet. The casing body is disc-shaped, and the water inlet is arranged at the center position of the front face of the casing. The center line of the first flow channel opening and the center line of the second flow channel opening are respectively tangent to the casing body. The first flow channel opening and the second flow channel opening are centrally symmetrical about the center of the casing body. The first flow channel plate and the second flow channel plate are both arranged inside the casing body. The first flow channel plate and the second flow channel plate are arc-shaped. The first flow channel plate connects the first flow channel opening and the inner side of the casing body, and the second flow channel plate connects the second flow channel opening and the inner side of the casing body. The first flow channel plate is arranged on the inner rear side of the casing body, and the second flow channel plate is arranged on the inner front side of the casing body. The first flow channel plate and the second flow channel plate are centrally symmetrical about the center of the casing body. The volute can ensure that the amount of water flowing out of the flow channel is greater than that of the single flow channel, but it cannot reduce the liquid flow rate, which will bring a greater impact to the subsequent pipeline and reduce the service life of the pipeline. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problems that the conventional pump casing structure has a large radial dimension and cannot be used in places with limited space, and there is a certain radial force when the pump is running, which is not conducive to the safe operation of the water pump. A double-channel centrifugal pump casing is provided. Through the design of double baffles, double diffusion sections and double channels, the radial force of the pump body can be well eliminated, the running stability of the pump is improved, the pump is safer and more reliable, and the service life of the pump casing is increased. The special direction design of the double channel can better meet the places with strict requirements on the installation dimensions of the pump body in the inlet and outlet.

[0005] The utility model adopts the technical scheme to achieve the above-mentioned purpose: a double-channel centrifugal pump housing, including an extrusion chamber, an axial side of the extrusion chamber is connected with a large flange, the other axial side of the extrusion chamber is provided with a medium inlet, the medium inlet is connected with an inlet flow channel, the inlet flow channel is connected with an inlet flange, the inner sides of the extrusion chamber are provided with a first diffusion section and a second diffusion section for medium to flow out, the first diffusion section and the second diffusion section are symmetrically distributed with the extrusion chamber as the center, the first diffusion section is connected with a first medium outlet, a first baffle tongue is arranged at the first medium outlet, the end of the first baffle tongue is arranged toward the first diffusion section, the first medium outlet is connected with a first outlet flow channel, the second diffusion section is connected with a second medium outlet, a second baffle tongue is arranged at the second medium outlet, the end of the second baffle tongue is arranged toward the second diffusion section, the second medium outlet is connected with a second outlet flow channel, the first outlet flow channel and the second outlet flow channel are distributed on both radial sides of the extrusion chamber, and the first outlet flow channel and the second outlet flow channel are connected to the same outlet flange, and the inner diameters of the first outlet flow channel and the second outlet flow channel are arranged from small to large from the extrusion chamber end to the outlet flange end.

[0006] Furthermore, the inner diameter of the inlet flow channel is arranged from small to large from the inlet flange end to the extrusion chamber end.

[0007] Furthermore, the inlet flow channel is arranged in an L-shaped structure.

[0008] Furthermore, the inlet flange and the outlet flange are located on the other two sides of the extrusion chamber in the radial direction and are parallel to each other.

[0009] Furthermore, the first outlet flow channel and the second outlet flow channel are in a twisted structure.

[0010] Furthermore, the inlet flow channel, the first outlet flow channel and the second outlet flow channel are commonly connected to a base.

[0011] Furthermore, the extrusion chamber, the large flange, the inlet flow channel, the inlet flange, the first outlet flow channel, the second outlet flow channel, the outlet flange and the base are an integrally formed structure.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] (1) The double-channel centrifugal pump casing of the utility model can effectively eliminate the radial force of the pump body and improve the running stability of the pump through the design of double baffles, double diffusion sections and double channels. The flow area of ​​the inlet channel and the double channel is evenly increased, which can further reduce the medium flow rate, thereby reducing the bearing impact force of the pump casing body, making it safer and more reliable, and prolonging the service life of the pump casing. The double channel is led out from the radial sides of the extrusion chamber. Its special direction design can better meet the requirements of the pump body in places with strict inlet and outlet installation dimensions, and the pump body looks more beautiful.

[0014] (2) The housing of the dual-channel centrifugal pump of the utility model is formed in one piece, which can improve the strength of the pump housing and effectively prevent the problem of pump body cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram of the traditional pump casing structure.

[0016] Figure 2 This is a structural diagram of the double-channel centrifugal pump casing of the utility model.

[0017] Figure 3 This is a structural front view of the double-channel centrifugal pump casing of the utility model.

[0018] Figure 4 for Figure 3 AA section view.

[0019] Figure 5 It is a structural rear view of the casing of the dual-channel centrifugal pump of the utility model.

[0020] Figure 6 It is a structural left view of the casing of the dual-channel centrifugal pump of the utility model.

[0021] Figure 7 It is a right side view of the structure of the double-channel centrifugal pump casing of the utility model.

[0022] Figure 8 This is a bottom view of the structure of the dual-channel centrifugal pump housing of the utility model (excluding the base).

[0023] In the figure: 1. extrusion chamber, 101. first diffusion section, 102. first medium outlet, 103. first baffle tongue, 104. second diffusion section, 105. second medium outlet, 106. second baffle tongue, 2. large flange, 3. medium inlet, 4. inlet flow channel, 5. inlet flange, 6. first outlet flow channel, 7. second outlet flow channel, 8. outlet flange, 9. base. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the specific embodiments.

[0025] like Figure 2-8A dual-channel centrifugal pump casing is shown, including an extrusion chamber 1, one axial side of the extrusion chamber 1 is connected to a large flange 2, the other axial side of the extrusion chamber 1 is provided with a medium inlet 3, the medium inlet 3 is connected to an inlet channel 4, the inlet channel 4 is arranged in an L-shaped structure, the inlet channel 4 is connected to an inlet flange 5, the inner sides of the extrusion chamber 1 are provided with a first diffusion section 101 and a second diffusion section 104 for medium to flow out, the first diffusion section 101 and the second diffusion section 104 are symmetrically distributed with the extrusion chamber 1 as the center, the first diffusion section 101 is connected to a first medium outlet 102, a first baffle tongue 103 is arranged at the first medium outlet 102, the end of the first baffle tongue 103 is arranged toward the first diffusion section 101, and the first medium outlet 102 is connected to The first outlet flow channel 6 and the second diffusion section 104 are connected to the second medium outlet 105, a second baffle tongue 106 is arranged at the second medium outlet 105, the end of the second baffle tongue 106 is arranged toward the second diffusion section 104, the second medium outlet 105 is connected to the second outlet flow channel 7, the first outlet flow channel 6 and the second outlet flow channel 7 are distributed on both sides of the radial direction of the extrusion chamber 1, and the first outlet flow channel 6 and the second outlet flow channel 7 are connected to the same outlet flange 8, the first outlet flow channel 6 and the second outlet flow channel 7 are twisted in structure, the inner diameters of the first outlet flow channel 6 and the second outlet flow channel 7 are arranged from small to large from the end of the extrusion chamber 1 to the end of the outlet flange 8, the inlet flange 5 and the outlet flange 8 are located on the other two sides of the radial direction of the extrusion chamber 1 and are parallel to each other.

[0026] Preferably, the inner diameter of the inlet flow channel 4 is arranged from small to large from the inlet flange 5 end to the extrusion chamber 1 end.

[0027] Preferably, the inlet flow channel 4 , the first outlet flow channel 6 and the second outlet flow channel 7 are commonly connected to a base 9 .

[0028] Preferably, the extrusion chamber 1, the large flange 2, the inlet flow channel 4, the inlet flange 5, the first outlet flow channel 6, the second outlet flow channel 7, the outlet flange 8 and the base 9 are an integrally formed structure, and the various components of the shell are integrally formed, which can improve the strength of the pump shell and effectively prevent the problem of pump body cracking.

[0029] When the double-channel centrifugal pump casing of the utility model is in use: the medium conveyed by the water pump is sucked in horizontally from the inlet flange 5, and is converted to axially enter the extrusion chamber 1 through the inlet channel 5 of the elbow structure. From the inlet flange 5, the flow area of ​​the inlet channel 5 can be equal or gradually and evenly increased, so that the medium flow velocity is in a low-speed range and the flow is stable. After the speed increase and pressurization of the water pump power equipment (impeller), the medium flows into the extrusion chamber 1, and the medium enters the first medium outlet 102 through the first diffusion section 101, and enters the second medium outlet 105 through the second diffusion section 104. The medium then enters the first outlet channel 6 and the second outlet channel 7 through the first medium outlet 102 and the second medium outlet 105 respectively. The flow areas of the first outlet channel 6 and the second outlet channel 7 are evenly increased, further reducing the medium flow velocity (reducing resistance loss) and increasing pressure energy. The first outlet channel 6 and the second outlet channel 7 meet at the outlet flange 8, and the two channels are combined into one, and the medium is collected together and flows out from the outlet flange 8.

[0030] The pressure water chamber is designed according to the design flow rate. Under the design flow rate, the flow velocity and pressure of the liquid in the pressure water chamber around the impeller are uniform and axisymmetric, and theoretically there is no radial force. When the flow rate is less than the design flow rate, the flow velocity in the pressure water chamber starts to decrease from the baffle, which is equivalent to the flow pressure gradually increasing in the diffusion section. Under the structural arrangement of double baffles + double diffusion sections in the pressure water chamber, the radial forces on both sides are the same in magnitude and opposite in direction at a difference of 180°, and they cancel each other out, which is externally manifested as no radial force. Similarly, when the flow rate is greater than the design flow rate, the flow velocity in the pressure water chamber starts to increase from the baffle, which is equivalent to the flow pressure gradually decreasing in the diffusion section. Under the structural arrangement of double baffles + double diffusion sections in the pressure water chamber, the radial forces on both sides are the same in magnitude and opposite in direction at a difference of 180°, and they cancel each other out, which is externally manifested as no radial force.

[0031] The flow direction of the medium when flowing through the first medium outlet of the extrusion chamber and the flow direction when flowing through the pump body outlet flange have not changed except for the different spatial positions. The flow direction of the medium when flowing through the second medium outlet of the extrusion chamber and the flow direction when flowing through the pump body outlet flange have changed by 180° except for the different spatial positions. The first outlet flow channel and the second outlet flow channel are on both sides of the extrusion chamber. Although they are different in appearance, they can be roughly regarded as symmetrical structures. The overall structure is relatively symmetrical, coordinated and beautiful.

[0032] The double-channel centrifugal pump casing of the utility model can effectively eliminate the radial force of the pump body and improve the running stability of the pump through the design of double baffles, double diffusion sections and double channels. The flow area of ​​the inlet channel and the double channel is evenly increased, which can further reduce the flow rate of the medium, thereby reducing the bearing impact force of the pump casing body, making it safer and more reliable, and prolonging the service life of the pump casing. The double channel is led out from the radial sides of the extrusion chamber, and its special direction design can better meet the requirements of the pump body in places with strict inlet and outlet installation dimensions, and the pump body looks more beautiful.

[0033] The above contents are further detailed descriptions of the utility model in combination with the preferred technical solutions, and the specific implementation of the utility model cannot be limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, simple deductions and substitutions can be made without departing from the concept of the utility model, which should be regarded as the protection scope of the utility model.

Claims

1. A dual-channel centrifugal pump housing, characterized in that: It includes an extrusion chamber, one axial side of the extrusion chamber is connected to a large flange, the other axial side of the extrusion chamber is provided with a medium inlet, the medium inlet is connected to an inlet flow channel, the inlet flow channel is connected to an inlet flange, the inner sides of the extrusion chamber are provided with a first diffusion section and a second diffusion section for medium to flow out, the first diffusion section and the second diffusion section are symmetrically distributed with the extrusion chamber as the center, the first diffusion section is connected to a first medium outlet, a first baffle tongue is provided at the first medium outlet, the end of the first baffle tongue is arranged toward the first diffusion section, the first medium outlet is connected to a first outlet flow channel, the second diffusion section is connected to a second medium outlet, a second baffle tongue is provided at the second medium outlet, the end of the second baffle tongue is arranged toward the second diffusion section, the second medium outlet is connected to a second outlet flow channel, the first outlet flow channel and the second outlet flow channel are distributed on both radial sides of the extrusion chamber, and the first outlet flow channel and the second outlet flow channel are connected to the same outlet flange, and the inner diameters of the first outlet flow channel and the second outlet flow channel are arranged in a structure from small to large from the extrusion chamber end to the outlet flange end.

2. A dual-channel centrifugal pump housing according to claim 1, characterized in that: The inner diameter of the inlet flow channel is arranged in a structure from small to large from the inlet flange end to the extrusion chamber end.

3. A dual-channel centrifugal pump housing according to claim 1, characterized in that: The inlet flow channel is arranged in an L-shaped structure.

4. A dual-channel centrifugal pump housing according to claim 1, characterized in that: The inlet flange and the outlet flange are located on the other two sides of the extrusion chamber in the radial direction and are parallel to each other.

5. A dual-channel centrifugal pump housing according to claim 1, characterized in that: The first outlet flow channel and the second outlet flow channel are in a twisted structure.

6. A dual-channel centrifugal pump housing according to claim 1, characterized in that: The inlet flow channel, the first outlet flow channel and the second outlet flow channel are commonly connected to a base.

7. A dual-channel centrifugal pump casing according to claim 6, characterized in that: The extrusion chamber, the large flange, the inlet flow channel, the inlet flange, the first outlet flow channel, the second outlet flow channel, the outlet flange and the base are an integrally formed structure.

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