Single-stage centrifugal pump

Abstract

The utility model provides a single-stage centrifugal pump, and belongs to the technical field of centrifugal pumps. The problem that an impeller is difficult to replace in the prior art is solved. An impeller groove is formed in the front side of the volute, a connecting seat is formed on the outer ring of the rear side of the volute, a packing box body is formed in the rear side of the volute, a shaft through hole is formed in the volute, a pump cavity is formed in the volute, a water outlet is formed in the outer portion of the volute, and the water outlet is communicated with the pump cavity. The volute is fixedly connected with the pump body through a connecting base, a pump shaft is fixedly arranged in the volute and the pump body in a penetrating mode, one end of the pump shaft is fixedly connected with a pump impeller, the pump impeller is fixedly installed in an impeller groove, the periphery of the pump shaft is fixedly sleeved with a stuffing box gland, a bearing box body is formed on the rear side of the pump body, and a bearing box end cover is fixed to one side of the bearing box body. And the filler box body is fixedly connected with the bearing box end cover. The utility model has the advantages of simple structure and convenience in disassembly.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal pumps and relates to a single-stage centrifugal pump. Background Art

[0002] Centrifugal pumps have the advantages of simple structure, easy manufacturing, stable flow rate, strong adaptability, convenient operation, etc., so they are widely used in chemical production.

[0003] A Chinese patent with the patent publication number CN205297944U discloses a centrifugal pump, including a pump body, a main impeller installed in the pump body, a gas-liquid separation impeller and a vacuum suction device. The main impeller includes a front side and a rear side opposite to each other. The front side of the main impeller cooperates with the pump body to form a main cavity. A gas-liquid separation cavity communicating with the main cavity is provided at the rear side of the main impeller. The gas-liquid separation impeller is rotatably arranged in the gas-liquid separation cavity and has a certain gap with the inner wall of the gas-liquid separation cavity. The gas-liquid separation cavity is connected to the vacuum suction device so that the air pressure in the gas-liquid separation cavity is lower than the air pressure in the main cavity. The main impeller is provided with through holes, and the gas-liquid separation cavity communicates with the main cavity through the through holes.

[0004] In the centrifugal pump provided by this patent, the main impeller is installed inside the pump body. After long-term use, when impurities enter, it is difficult to replace the impeller. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a single-stage centrifugal pump for the above problems existing in the prior art.

[0006] The purpose of the utility model can be realized by the following technical solutions: A single-stage centrifugal pump includes a pump body and a volute. An impeller groove is provided at the front side of the volute. A connecting seat is formed on the outer circle at the rear side of the volute. A stuffing box body is formed inside the rear side of the volute. A shaft through hole is provided inside the volute. A pump cavity is formed inside the volute and a water outlet is formed outside the volute. The water outlet is communicated with the pump cavity. The volute is fixedly connected to the pump body through the connecting seat. A pump shaft is fixedly installed through the volute and the pump body. One end of the pump shaft is fixedly connected with a pump impeller. The pump impeller is fixedly installed in the impeller groove. A stuffing box gland is fixedly sleeved on the outer circumference of the pump shaft. A bearing box body is formed at the rear side of the pump body. A bearing box end cover is fixed on one side of the bearing box body. The stuffing box body is fixedly connected to the bearing box end cover.

[0007] In the above single-stage centrifugal pump, the pump shaft passes through the bearing box body, and a first bearing and a second bearing are fixedly sleeved on the pump shaft at both ends of the bearing box body.

[0008] In the above single-stage centrifugal pump, a coupling is fixedly installed at one end of the pump shaft.

[0009] In the above-mentioned single-stage centrifugal pump, a number of outer holes are provided on the outer side of the volute, and volute plugs are installed in the outer holes.

[0010] In the above-mentioned single-stage centrifugal pump, a flow guiding groove is provided in the impeller groove, and the flow guiding groove is communicated with the inside of the pump chamber.

[0011] Compared with the prior art, the single-stage centrifugal pump provided by the present utility model has the following beneficial effects: through the structural setting of providing an impeller groove in the volute, the pump impeller can be fixedly connected to the volute through the impeller groove, and since the impeller groove is communicated with the outside, the pump impeller installed in the impeller groove can be disassembled more conveniently. Description of the Drawings

[0012] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0013] Figure 2 is an exploded schematic diagram of the present utility model;

[0014] Figure 3 is a schematic diagram of the volute structure.

[0015] In the figure: 1, pump body; 11, bearing housing; 12, bearing housing end cover; 2, volute; 21, impeller groove; 211, flow guiding groove; 22, connecting seat; 23, stuffing box body; 24, shaft through hole; 25, pump chamber; 26, water outlet; 27, outer hole; 28, volute plug; 3, pump shaft; 31, first bearing; 32, second bearing; 33, coupling; 4, pump impeller; 5, stuffing box gland. Detailed Embodiments

[0016] The following are specific embodiments of the present utility model in combination with the drawings to further describe the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.

[0017] Such as Figures 1 to 3As shown in the figure, this embodiment includes a pump body 1, a volute 2, a pump shaft 3 and a pump impeller 4. A volute groove 21 is provided on the front side of the volute 2. The shape of the volute groove 21 is the same as that of the volute 2, and the size of the volute groove 21 is slightly smaller than that of the volute 2. A connecting seat 22 is formed on the outer ring at the rear side of the volute 2, and a stuffing box body 23 is formed inside the rear side of the volute 2. A shaft through hole 24 is provided inside the volute 2, and the shaft through hole 24 penetrates through the stuffing box body 23 and the volute groove 21. The volute groove 21 is directly communicated with the outside. The volute 2 is fixedly connected to the pump body 1 through the connecting seat 22. A bearing box body 11 is formed at the rear side of the pump body 1. The pump shaft 3 is fixedly installed through the stuffing box of the volute 2 and inside the bearing box of the pump body 1. The pump impeller 4 is fixedly connected to one end of the pump shaft 3 and the pump impeller 4 is fixedly installed in the volute groove 21. A coupling 33 is fixedly installed at the other end of the pump shaft 3. The pump impeller 4 is also directly communicated with the outside. A stuffing box gland 5 is fixedly sleeved on the outer periphery of the pump shaft 3. A bearing box end cover 12 is fixed on one side of the bearing box body 11. The stuffing box body 23 is fixedly connected to the bearing box end cover 12.

[0018] Specifically, as Figures 1 to 2 shown, the number of the stuffing box glands 5 is two. The stuffing box glands 5 are symmetrically distributed up and down, and the stuffing box glands 5 are fixedly attached to one end of the stuffing box body 23.

[0019] As Figures 1 to 3 shown, a pump chamber 25 is formed inside the volute 2, and a water outlet 26 is formed outside the volute 2. The water outlet 26 is communicated with the pump chamber 25. A diversion groove 211 is provided in the volute groove 21. The diversion groove 211 is communicated with the inside of the pump chamber 25. The diversion groove 211 improves the efficiency of the pump impeller 4.

[0020] Further elaborating, as Figures 1 to 3 shown, a first bearing 31 and a second bearing 32 are fixedly sleeved on the pump shaft 3 at both ends of the bearing box body 11. The first bearing 31 and the second bearing 32 are located inside the bearing box body 11.

[0021] Further elaborating, as Figures 1 to 3 shown, a number of outer holes 27 are provided on the outer side of the volute 2. A volute plug 28 is installed in the outer holes 27. The volute plug 28 can prevent water from leaking out of the outer wall of the volute 2.

[0022] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0023] Although various terms are used more frequently in this text, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

Claims

1. A single-stage centrifugal pump, comprising a pump body (1) and a volute (2), characterized in that: The front side of the volute (2) is provided with an impeller groove (21), the outer ring of the rear side of the volute (2) forms a connecting seat (22), the inner part of the rear side of the volute (2) forms a stuffing box body (23), the inner part of the volute (2) is provided with a shaft through hole (24), the inner part of the volute (2) forms a pump chamber (25) and the outer part of the volute (2) forms a water outlet (26), the water outlet (26) is communicated with the pump chamber (25), the volute (2) is fixedly connected with the pump body (1) through the connecting seat (22), a pump shaft (3) is fixedly installed through the volute (2) and the pump body (1), one end of the pump shaft (3) is fixedly connected with a pump impeller (4), the pump impeller (4) is fixedly installed in the impeller groove (21), a stuffing box gland (5) is fixedly sleeved on the outer periphery of the pump shaft (3), the rear side of the pump body (1) forms a bearing box body (11), one side of the bearing box body (11) is fixedly provided with a bearing box end cover (12), and the stuffing box body (23) is fixedly connected with the bearing box end cover (12).

2. The single-stage centrifugal pump according to claim 1, characterized in that: The pump shaft (3) passes through the bearing box body (11), and a first bearing (31) and a second bearing (32) are fixedly sleeved on the pump shaft (3) at both ends of the bearing box body (11).

3. The single-stage centrifugal pump according to claim 1, wherein: One end of the pump shaft (3) is fixedly installed with a coupling (33).

4. A single-stage centrifugal pump according to claim 1, characterized in that: A plurality of outer side holes (27) are formed in the outer side of the volute (2), and volute plugs (28) are installed in the outer side holes (27).

5. A single-stage centrifugal pump according to claim 1, characterized in that: A flow guiding groove (211) is formed in the impeller groove (21), and the flow guiding groove (211) is communicated with the inside of the pump chamber (25).

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