Small centrifugal water pump body structure

Abstract

The utility model provides a small centrifugal water pump body structure, and belongs to the technical field of water pumps. The problem that an impeller of an existing centrifugal pump is inconvenient to disassemble and assemble is solved. The small centrifugal water pump body structure comprises a pump shell, a water inlet hole, a water outlet hole and a pump cavity used for communicating the water inlet hole and the water outlet hole are formed in the pump shell, a pump shaft and an impeller are arranged in the pump cavity, the rear end of the pump shaft extends out of the pump cavity, the impeller is fixedly connected with the front end of the pump shaft through a bolt, and the head of the bolt faces a water inlet; the pump shell comprises a main body of an integrated structure, and the pump cavity and the water outlet hole are both formed in the main body. An opening is formed in the front side of the main body; a water inlet cylinder is screwed in the opening, and an inner hole of the water inlet cylinder is a water inlet hole; the front end of the water inlet cylinder extends out of the opening, the rear end of the water inlet cylinder is sleeved outside the water guide ring, the water guide ring and the water inlet cylinder are in clearance fit to form an annular channel, and the width of the annular channel is 0.2 mm-0. 5mm. The impeller is convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model belongs to the technical field of water pumps and relates to a centrifugal water pump, in particular to a pump body structure of a small centrifugal water pump. Background Art

[0002] A centrifugal water pump is a pumping machine that uses the centrifugal motion of water and is widely used in industry, civil use, and shipbuilding.

[0003] Existing centrifugal pumps, such as a horizontal radial multistage centrifugal pump disclosed in the Chinese Patent Library (application number: 201010176075.7), include a volute, a pump cover, a shaft seal, a coupling frame, a bearing box, a bearing, a bearing end cover and a pump shaft, and also include a first-stage impeller, a secondary impeller and a guide vane. The first-stage impeller and the secondary impeller are fixed to the pump shaft by key connection and rotate together with the pump shaft; the secondary impeller is radially arranged on the outside of the first-stage impeller, the guide vane is radially arranged between the first-stage impeller and the secondary impeller, the guide vane is fixed to the inside of the volute by a threaded connection, and the guide vane collects the liquid discharged from the first-stage impeller and guides it into the secondary impeller; the first-stage impeller has three-dimensional twisted blades, and a balancing hole is opened on the rear cover plate of the first-stage impeller. The number of blades of the first-stage impeller is Z1 The number of blades of the guide vane is 5 to 7, and the guide vane and the secondary impeller are both two-dimensional cylindrical blades. The number of blades of the guide vane is 3 (Z1-1), and the number of blades of the secondary impeller is 2 (Z1-1).

[0004] After long-term use, flocculants will be entangled on the impeller and need to be cleaned regularly. For the above centrifugal pump, it is necessary to first unscrew the multiple screws that fix the volute, then remove the volute, and then separate the impeller and the pump shaft. In the above process, there are not only many steps to disassemble and assemble the volute, but the volute itself is large and heavy, which is not conducive to the disassembly and assembly of the impeller. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a small centrifugal water pump body structure which is convenient for disassembly and assembly of the impeller.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a small centrifugal water pump body structure, including a pump casing, a water inlet hole, a water outlet hole and a pump cavity for connecting the water inlet hole and the water outlet hole are provided on the pump casing, a pump shaft and an impeller are provided in the pump cavity, the rear end of the pump shaft extends out of the pump cavity, the impeller is fixedly connected to the front end of the pump shaft by bolts, and the bolt heads face the water inlet, and the front side of the impeller is a water guide ring, characterized in that the pump casing includes a main body of an integrated structure, and the above-mentioned pump cavity and water outlet hole are both arranged on the main body; an opening is provided on the front side of the main body, and the size of the impeller is smaller than the size of the opening; a water inlet cylinder is screwed in the opening, and the inner hole of the water inlet cylinder is the above-mentioned water inlet hole; the front end of the water inlet cylinder extends out of the opening, the rear end of the water inlet cylinder is sleeved outside the water guide ring and the gap between the two is matched to form an annular channel, and the width of the annular channel is 0.2mm~0.5mm.

[0007] The clearance between the rear end of the water inlet cylinder and the water guide ring forms an annular channel with extremely small width, so that the two form a seal without contact, ensuring that water is completely drawn into the impeller through the water inlet hole for pressurization and thrown out by the impeller into the pump chamber, thus ensuring the performance of the water pump.

[0008] The water inlet cylinder is screwed in the opening, and the size of the impeller is smaller than the size of the opening. In this way, after the water inlet cylinder and the bolt are unscrewed, the impeller can be taken out through the opening for cleaning. Not only are there fewer steps, but the water inlet cylinder itself is small in size and light in weight, making the disassembly and assembly process easier and more convenient, thereby effectively facilitating the disassembly and assembly of the impeller.

[0009] In the above-mentioned small centrifugal water pump body structure, an annular limit seat is integrally formed on the outer wall of the front end of the above-mentioned water inlet cylinder. The limit seat is coaxially arranged with the water inlet cylinder, and the limit seat is pressed on the edge of the opening, so that the water inlet cylinder can be rotated into place at one time, further facilitating the disassembly and assembly of the impeller.

[0010] In the above-mentioned small centrifugal water pump body structure, an annular groove coaxial with the opening is provided on the inner wall of the opening, a sealing ring is provided in the annular groove, and the inner wall of the sealing ring is in contact and sealed with the outer wall of the water inlet cylinder to enhance the sealing performance formed between the main body and the water inlet cylinder and ensure stable operation of the water pump.

[0011] In the above-mentioned small centrifugal water pump body structure, the axial cross-section of the annular groove is L-shaped, and the two end faces of the sealing ring are respectively in contact and sealed with the bottom surface of the annular groove and the rear end face of the limit seat to extend the sealing path formed between the main body and the water inlet cylinder and enhance the sealing performance of both.

[0012] In the above-mentioned small centrifugal water pump body structure, there is a conical surface on the inner wall of the water inlet cylinder, the diameter of the conical surface gradually decreases from front to back, the front side of the conical surface extends to the front end of the water inlet cylinder, and the conical surface is located in front of the water guide ring. The design of the conical surface is used to pressurize the fluid to make the water pump performance better.

[0013] In the above-mentioned small centrifugal water pump body structure, the rear end outer wall of the water inlet cylinder is a conical introduction surface, and the diameter of the introduction surface gradually decreases from front to back. The design of the introduction surface is used for installation guidance of the water inlet cylinder, which is convenient for disassembly and assembly of the water inlet cylinder.

[0014] In the above-mentioned small centrifugal water pump body structure, an external thread is provided at the front end of the water inlet cylinder to facilitate the connection of the water inlet cylinder to the water supply equipment.

[0015] In the above-mentioned small centrifugal water pump body structure, the main body is a cast integral part.

[0016] Compared with the prior art, the pump body structure of this small centrifugal water pump has the following advantages:

[0017] 1. The water inlet cylinder is screwed into the opening, and the impeller size is smaller than the opening size. In this way, after unscrewing the water inlet cylinder and the bolt, the impeller can be taken out through the opening for cleaning. Not only are there fewer steps, but the water inlet cylinder itself is small in size and light in weight, making the disassembly and assembly process easier and more convenient, thereby effectively facilitating the disassembly and assembly of the impeller.

[0018] 2. The conical surface design is used to pressurize the fluid to make the water pump perform better. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the pump body structure of this small centrifugal water pump.

[0020] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0021] In the figure, 1, pump shaft; 2, impeller; 2a, water guide ring; 3, bolt; 4, main body; 4a, pump chamber; 4b, water outlet; 4c, opening; 5, water inlet cylinder; 5a, water inlet hole; 5b, limit seat; 5c, cone surface; 5d, introduction surface; 6, annular channel; 7, sealing ring. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] like Figure 1 As shown, the pump body structure of the small centrifugal water pump includes a pump casing, on which a water inlet hole 5a, a water outlet hole 4b and a pump cavity 4a for connecting the water inlet hole 5a and the water outlet hole 4b are provided.

[0024] in,

[0025] A pump shaft 1 and an impeller 2 are provided in the pump chamber 4a. The axis of the pump shaft 1 extends forward and backward, and the rear end of the pump shaft 1 extends out of the pump chamber 4a. In actual products, the middle part of the pump shaft 1 is rotatably arranged on the pump housing through a bearing.

[0026] The impeller 2 is fixedly connected to the front end of the pump shaft 1 by bolts 3, and the heads of the bolts 3 face the water inlet. Specifically, the front side of the impeller 2 is a water guide ring 2a, and the rear side of the impeller 2 is provided with a slot matching the front end of the pump shaft 1, and the pump shaft 1 is inserted into the slot and pressed on the bottom wall of the slot; a through hole is axially penetrated on the bottom wall of the slot, and the rod of the bolt 3 passes through the through hole and is screwed into the pump shaft 1, and the head of the bolt 3 is tightly pressed on the impeller 2 to stably connect the impeller 2 and the pump shaft 1. Further explanation, a keyway is axially provided on the inner side wall of the slot, and a key block matching the keyway is provided on the side wall of the pump shaft 1, and the key block is inserted into the keyway to enhance the effect of the circumferential connection between the impeller 2 and the pump shaft 1.

[0027] like Figure 1 and Figure 2 As shown, the pump housing includes a main body 4 of an integrated structure, and the pump chamber 4a and the water outlet 4b are both arranged on the main body 4. Preferably, the main body 4 is a cast integral part. An opening 4c is provided on the front side of the main body 4, and the size of the impeller 2 is smaller than the size of the opening 4c, so that the impeller 2 can extend into or out of the pump chamber 4a through the opening 4c. A water inlet cylinder 5 is screwed into the opening 4c, and the inner hole of the water inlet cylinder 5 is the water inlet hole 5a mentioned above; the front end of the water inlet cylinder 5 extends out of the opening 4c, and the rear end of the water inlet cylinder 5 is sleeved outside the water guide ring 2a, and the gap between the two forms an annular channel 6, and the width of the annular channel 6 is 0.2mm~0.5mm, and preferably this width is 0.3mm.

[0028] The rear end of the water inlet cylinder 5 and the water guide ring 2a are clearance-matched to form an annular channel 6 with extremely small width, so that the two form a seal without contact, ensuring that water is completely drawn into the impeller 2 through the water inlet hole 5a for pressurization and thrown out by the impeller 2 to the pump chamber 4a, thereby ensuring the performance of the water pump.

[0029] The water inlet cylinder 5 is screwed into the opening 4c, and the size of the impeller 2 is smaller than that of the opening 4c. In this way, after the water inlet cylinder 5 and the bolt 3 are unscrewed, the impeller 2 can be taken out through the opening 4c for cleaning. Not only are there fewer steps, but the water inlet cylinder 5 itself is small in size and light in weight, making the disassembly and assembly process easier and more convenient, thereby effectively facilitating the disassembly and assembly of the impeller 2.

[0030] To further explain, a ring-shaped limit seat 5b is integrally formed on the outer wall of the front end of the water inlet cylinder 5. The limit seat 5b is coaxially arranged with the water inlet cylinder 5, and the limit seat 5b is pressed on the edge of the opening 4c, so that the water inlet cylinder 5 can be rotated into place at one time, further facilitating the disassembly and assembly of the impeller 2.

[0031] like Figure 2As shown, an annular groove coaxial with the opening 4c is provided on the inner wall of the opening 4c, a sealing ring 7 is provided in the annular groove, and the inner side wall of the sealing ring 7 is in contact and sealed with the outer wall of the water inlet cylinder 5, so as to strengthen the sealing performance formed between the main body 4 and the water inlet cylinder 5, and ensure the stable operation of the water pump. In this embodiment, the axial cross-section of the annular groove is L-shaped, and the two end surfaces of the sealing ring 7 are in contact and sealed with the bottom surface of the annular groove and the rear end surface of the limit seat 5b, respectively, so as to extend the sealing path formed between the main body 4 and the water inlet cylinder 5, and strengthen the sealing performance of both.

[0032] like Figure 1 and Figure 2 As shown, there is a conical surface 5c on the inner wall of the water inlet cylinder 5, and the diameter of the conical surface 5c gradually decreases from front to back. The front side of the conical surface 5c extends to the front end surface of the water inlet cylinder 5, and the conical surface 5c is located in front of the water guide ring 2a. The design of the conical surface 5c is used for fluid pressurization to improve the performance of the water pump. The rear end outer wall of the water inlet cylinder 5 is a conical introduction surface 5d, and the diameter of the introduction surface 5d gradually decreases from front to back. The design of the introduction surface 5d is used for installation guidance of the water inlet cylinder 5, which is convenient for the disassembly and assembly of the water inlet cylinder 5.

[0033] In actual products, the front end of the water inlet cylinder 5 is provided with an external thread to facilitate the connection of the water inlet cylinder 5 to the water supply equipment.

[0034] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A small centrifugal water pump body structure, comprising a pump casing, the pump casing being provided with a water inlet hole (5a), a water outlet hole (4b) and a pump chamber (4a) for connecting the water inlet hole (5a) and the water outlet hole (4b), a pump shaft (1) and an impeller (2) being provided in the pump chamber (4a), the rear end of the pump shaft (1) extending out of the pump chamber (4a), the impeller (2) being fixedly connected to the front end of the pump shaft (1) by bolts (3), and the heads of the bolts (3) facing the water inlet, the front side of the impeller (2) being a water guide ring (2a), characterized in that: The pump casing comprises a main body (4) of an integrated structure, wherein the pump chamber (4a) and the water outlet hole (4b) are both arranged on the main body (4); an opening (4c) is arranged on the front side of the main body (4), and the size of the impeller (2) is smaller than the size of the opening (4c); a water inlet cylinder (5) is screwed into the opening (4c), and the inner hole of the water inlet cylinder (5) is the water inlet hole (5a); the front end of the water inlet cylinder (5) extends out of the opening (4c), and the rear end of the water inlet cylinder (5) is sleeved outside the water guide ring (2a), and the two are clearance-matched to form an annular channel (6), and the width of the annular channel (6) is 0.2 mm to 0.5 mm.

2. The small centrifugal water pump body structure according to claim 1 is characterized in that: An annular limiting seat (5b) is integrally formed on the front end outer wall of the water inlet cylinder (5), the limiting seat (5b) is coaxially arranged with the water inlet cylinder (5), and the limiting seat (5b) is pressed against the edge of the opening (4c).

3. The small centrifugal water pump body structure according to claim 1 or 2, characterized in that: An annular groove coaxial with the opening (4c) is provided on the inner wall of the opening (4c), a sealing ring (7) is provided in the annular groove, and the inner side wall of the sealing ring (7) is in contact and sealed with the outer wall of the water inlet cylinder (5).

4. The small centrifugal water pump body structure according to claim 3, characterized in that: The axial cross section of the annular groove is L-shaped, and the two end surfaces of the sealing ring (7) are in contact and sealed with the bottom surface of the annular groove and the rear end surface of the limiting seat (5b) respectively.

5. The small centrifugal water pump body structure according to claim 1, characterized in that: The inner wall of the water inlet cylinder (5) is provided with a conical surface (5c), the diameter of the conical surface (5c) gradually decreases from front to back, the front side of the conical surface (5c) extends to the front end surface of the water inlet cylinder (5), and the conical surface (5c) is located in front of the water guide ring (2a).

6. The small centrifugal water pump body structure according to claim 1, characterized in that: The rear end outer wall of the water inlet cylinder (5) is a conical introduction surface (5d), and the diameter of the introduction surface (5d) gradually decreases from front to back.

7. The small centrifugal water pump body structure according to claim 1, characterized in that: The front end of the water inlet cylinder (5) is provided with an external thread.

8. The small centrifugal water pump body structure according to claim 1, characterized in that: The main body (4) is a cast one-piece part.

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