Centrifugal water pump shaft support structure

Abstract

The utility model provides a centrifugal water pump shaft support structure, belonging to the field of water pump technology. It solves the problem that the existing support structure affects the service life of the oil seal. The centrifugal water pump shaft support structure includes a support frame, the support frame has a cylinder for the pump shaft to pass through, both ends of the cylinder are connected to the pump shaft through bearings, and cover plates are pressed and fixed on both end surfaces of the cylinder, and both cover plates are provided with center holes for the pump shaft to pass through, and an annular oil seal is provided in the center hole. An annular retaining frame is provided between the two bearings and the corresponding annular oil seals, and the retaining frame is sleeved and fixed on the pump shaft, and a seal is formed between the inner wall of the retaining frame and the outer wall of the pump shaft; the retaining frame includes a frame body with an L-shaped axial cross section, and the frame body is composed of a vertically arranged retaining ring and a connecting ring, the outer diameter of the retaining ring is larger than the inner diameter of the annular oil seal, and a convex ring is formed on the outer wall of the connecting ring, and an annular groove coaxial with the retaining frame is formed between the convex ring and the frame body. The centrifugal water pump shaft support structure can extend the service life of the oil seal.

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 shaft supporting structure of a centrifugal water pump. Background Art

[0002] A centrifugal water pump, also called a centrifugal pump, is a pumping machine that uses the centrifugal motion of water.

[0003] An existing centrifugal water pump, such as a horizontal end-suction centrifugal pump disclosed in the China Patent Library (application number: 201711018455.6), comprises a water pump head, the water pump head comprises a pump body, the pump body is provided with an impeller, a mechanical seal, a pump cover, and a pump shaft, the pump shaft outer sleeve is provided with a bearing, a bearing housing is installed outside the bearing, a groove arranged along the circumferential direction is provided on the bearing housing at the outer ring of the bearing, an O-ring is installed in the groove, the O-ring is used to prevent the bearing from creeping when the water pump is running, a retaining ring groove arranged along the circumferential direction is provided on the outer side of the bearing on the bearing housing, an elastic retaining ring is inserted in the retaining ring groove, A bearing end cover is installed on the outside of the elastic retaining ring, and the bearing end cover is sleeved on the pump shaft. A sealing ring is provided between the bearing end cover and the pump shaft. The water pump head is connected to the motor through a coupling, and a coupling cover is sleeved on the outer periphery of the coupling. The coupling cover is fixedly connected to the bearing housing, and a coupling accommodating cavity is provided inside the coupling cover. The left and right sides of the coupling accommodating cavity in the coupling cover are respectively connected with a motor end cover and a pump end cover. The motor end cover and the pump end cover are respectively used to wrap the rotating parts of the motor shaft head and the water pump shaft head. A common base is provided under the water pump head and the motor, and the water pump head and the motor are installed on the common base.

[0004] In the above-mentioned water pump, the bearing housing is connected to the pump shaft by bearings at both ends. In actual use, as the bearings rotate at high speed, they will wear and produce debris. The debris will flow with the lubricating oil in the bearing housing to the contact seal between the sealing ring and the pump shaft, accelerating the wear of the sealing ring and affecting the life of the sealing ring. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a centrifugal water pump shaft supporting structure which can prolong the service life of the annular oil seal.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a centrifugal water pump shaft support structure, including a support frame, the support frame has a horizontally arranged cylinder for the pump shaft to pass through, both ends of the cylinder are connected to the pump shaft through bearings, the upper side and the lower side of the middle of the cylinder are vertically penetrated with oil holes, both end surfaces of the cylinder are pressed and fixed with cover plates, both cover plates are provided with center holes for the pump shaft to pass through, and an annular oil seal is provided in the center hole to form a seal between the corresponding cover plate and the pump shaft, characterized in that an annular retaining frame is provided between the two bearings and the corresponding annular oil seal, the retaining frame is sleeved and fixed on the pump shaft, and a seal is formed between the inner side wall of the retaining frame and the outer wall of the pump shaft; the retaining frame includes a frame body with an L-shaped axial section, the frame body is composed of a vertically arranged retaining ring and a connecting ring, and the retaining ring is located between the connecting ring and the bearing; the outer diameter of the retaining ring is larger than the inner diameter of the annular oil seal, a convex ring is formed on the outer side wall of the connecting ring, the convex ring is located in the annular oil seal, and an annular groove coaxial with the retaining frame is formed between the convex ring and the frame body.

[0007] By setting the outer diameter of the retaining ring larger than the inner diameter of the annular oil seal, a blocking barrier is formed between the end face of the annular oil seal close to the retaining ring and the retaining ring, effectively preventing waste chips on the bearing from following the lubricating oil and moving into the inner hole of the annular oil seal; at the same time, an annular groove is formed between the frame and the convex ring arranged in the annular oil seal, which can further prevent waste chips from moving to the contact point between the annular oil seal and the pump shaft, thereby effectively extending the life of the oil seal.

[0008] In the above-mentioned centrifugal water pump shaft support structure, the above-mentioned frame and the pump shaft are tightly matched and fixedly connected, that is, at this time, the inner wall of the frame and the outer wall of the pump shaft are in close contact to form a seal, which has the advantages of simple structure and easy assembly.

[0009] In the above centrifugal water pump shaft support structure, an annular step is provided on the outer wall of the pump shaft, and there are two annular steps symmetrically distributed along the axial direction of the pump shaft; the annular step is composed of an annular side wall and an annular bottom wall, the inner walls of the frame and the annular oil seal are in contact and sealed with the annular side wall, and the retaining ring is pressed on the annular bottom wall. The annular step is provided so that the frame can be installed in place at one time, which further facilitates assembly.

[0010] In the above centrifugal water pump shaft support structure, the inner hole of the retaining ring is a tapered hole, the diameter of the tapered hole gradually increases from the retaining ring to the bearing, and the maximum diameter of the tapered hole is smaller than the outer diameter of the annular bottom wall. The tapered hole serves as an installation guide to enable the retaining frame to be pressed into the pump shaft more smoothly, further facilitating assembly.

[0011] In the above-mentioned centrifugal water pump shaft supporting structure, the retaining frame is an integrated structure.

[0012] In the above-mentioned centrifugal water pump shaft supporting structure, the retaining frame is made of plastic material and is formed in one step by injection molding.

[0013] In the above centrifugal water pump shaft support structure, the axial cross-section of the annular groove is in a U-shape, so as to effectively expand the volume of the annular groove, accommodate more lubricating oil, and enhance the difficulty of preventing waste chips from flowing to the contact point between the annular oil seal and the pump shaft.

[0014] As another solution, in the above centrifugal water pump shaft support structure, two annular positioning grooves are provided on the outer wall of the pump shaft, and sealing rings are provided in the two positioning grooves, and the outer walls of the two sealing rings are respectively in contact with the inner walls of the two connecting rings for sealing. The above design can achieve the purpose of forming a seal between the inner wall of the retaining frame and the outer wall of the pump shaft.

[0015] Compared with the prior art, the centrifugal water pump shaft support structure has the following advantages:

[0016] 1. By setting the outer diameter of the retaining ring larger than the inner diameter of the annular oil seal, a blocking barrier is formed between the end face of the annular oil seal close to the retaining ring and the retaining ring, which effectively prevents the waste chips on the bearing from moving with the lubricating oil to the inner hole of the annular oil seal, thereby extending the service life of the oil seal.

[0017] 2. An annular groove is formed between the frame and the convex ring arranged in the annular oil seal, which can further prevent waste chips from moving to the contact point between the annular oil seal and the pump shaft, thereby effectively extending the service life of the oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional schematic diagram of a centrifugal water pump.

[0019] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0020] Figure 3 It is a structural diagram of the retaining frame.

[0021] In the figure, 1, support frame; 1a, cylinder; 1b, oil hole; 2, bearing; 3, pump shaft; 3a, annular step; 4, sealing piece; 5, cover plate; 6, annular oil seal; 7, retaining frame; 7a, frame body; 7a1, retaining ring; 7a2, connecting ring; 7b, convex ring; 7c, annular groove; 7d, tapered hole. 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. Embodiment 1

[0023] like Figure 1As shown, the centrifugal water pump shaft support structure includes a support frame 1, and the support frame 1 has a cylinder 1a which is horizontally arranged and through which the pump shaft 3 passes. Both ends of the cylinder 1a are connected to the pump shaft 3 through bearings 2, and both bearings 2 are located in the cylinder 1a. In the actual product, the type of bearing 2 is a rolling bearing 2, and the inner ring and outer ring of the bearing 2 are respectively fixed to the pump shaft 3 and the cylinder 1a by interference fit.

[0024] in,

[0025] Oil holes 1b are vertically penetrated on the upper and lower sides of the middle part of the cylinder 1a, and sealing parts 4 are provided at both oil holes 1b to seal the corresponding oil holes 1b. When in use, the upper oil hole 1b is used to pour lubricating oil into the cylinder 1a for lubricating the bearing 2; the lower oil hole 1b is used to drain oil for replacing the lubricating oil. In the actual product, the sealing part 4 is a sealing screw, and the sealing screw is threaded into the oil hole 1b. Cover plates 5 are pressed and fixed on both end surfaces of the cylinder 1a, and both cover plates 5 are provided with center holes for the pump shaft 3 to pass through, and an annular oil seal 6 is provided in the center hole to form a seal between the corresponding cover plate 5 and the pump shaft 3. At this time, the annular oil seal 6 is sleeved on the pump shaft 3, and the inner wall of the annular oil seal 6 is in contact with the outer wall of the pump shaft 3 for sealing.

[0026] like Figure 2 and Figure 3 As shown, an annular retaining frame 7 is provided between the two bearings 2 and the corresponding annular oil seal 6. The retaining frame 7 is sleeved and fixed on the pump shaft 3, and a seal is formed between the inner wall of the retaining frame 7 and the outer wall of the pump shaft 3. The retaining frame 7 includes a frame body 7a with an L-shaped axial cross section, and the frame body 7a is composed of a retaining ring 7a1 and a connecting ring 7a2 arranged vertically, and the retaining ring 7a1 is located between the connecting ring 7a2 and the bearing 2. The retaining ring 7a1 is located outside the annular oil seal 6, and the outer diameter of the retaining ring 7a1 is greater than the inner diameter of the annular oil seal 6. A convex ring 7b is formed on the outer wall of the connecting ring 7a2, and the convex ring 7b is located inside the annular oil seal 6, and the convex ring 7b is located between the corresponding retaining ring 7a1 and the contact position of the corresponding oil seal and the pump shaft 3. An annular groove 7c coaxial with the retaining frame 7 is formed between the convex ring 7b and the frame body 7a.

[0027] By setting the outer diameter of the retaining ring 7a1 larger than the inner diameter of the annular oil seal 6, a blocking barrier is formed between the end face of the annular oil seal 6 close to the retaining ring 7a1 and the retaining ring 7a1, which effectively prevents waste chips on the bearing 2 from following the lubricating oil and moving to the inner hole of the annular oil seal 6; at the same time, an annular groove 7c is formed between the frame 7a and the convex ring 7b arranged in the annular oil seal 6, which can further prevent waste chips from moving to the contact point between the annular oil seal 6 and the pump shaft 3, thereby effectively extending the service life of the oil seal.

[0028] In this embodiment,

[0029] The cover plate 5 is fixedly connected to the cylinder 1a by a circle of bolts. A positioning ring is formed on the inner side of the cover plate 5. The positioning ring is sleeved on the pump shaft 3 and pressed on the outer ring of the corresponding bearing 2 to limit the axial position of the bearing 2 and ensure the stable operation of the pump shaft 3.

[0030] like Figure 2 and Figure 3 As shown, the retaining frame 7 is installed as follows: the frame body 7a is tightly matched and fixedly connected with the pump shaft 3, that is, at this time, the inner wall of the frame body 7a is in close contact with the outer wall of the pump shaft 3 to form a seal, which has the advantages of simple structure and convenient assembly. Further explanation, an annular step 3a is provided on the outer wall of the pump shaft 3, and the annular step 3a and the pump shaft 3 are coaxially arranged. There are two annular steps 3a and they are symmetrically distributed along the axis of the pump shaft 3. The annular step 3a is composed of an annular side wall and an annular bottom wall. The inner walls of the frame body 7a and the annular oil seal 6 are in contact and sealed with the annular side wall, and the retaining ring 7a1 is pressed on the annular bottom wall. The annular step 3a is provided so that the frame body 7a can be installed in place at one time, which further facilitates assembly.

[0031] Furthermore, the inner hole of the retaining ring 7a1 is a tapered hole 7d, the diameter of the tapered hole 7d gradually increases from the retaining ring 7a1 to the bearing 2, and the maximum diameter of the tapered hole 7d is smaller than the outer diameter of the annular bottom wall. The tapered hole 7d serves as an installation guide, so that the retaining frame 7 can be pressed into the pump shaft 3 more smoothly, further facilitating assembly.

[0032] In actual products, the retaining frame 7 is an integrated structure, and preferably the retaining frame 7 is made of plastic material and is formed in one step by injection molding. The axial cross section of the annular groove 7c is in the shape of a U-shaped, so as to effectively expand the volume of the annular groove 7c, accommodate more lubricating oil, and enhance the difficulty of preventing waste chips from flowing to the contact point between the annular oil seal 6 and the pump shaft 3. Embodiment 2

[0033] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that two annular positioning grooves are provided on the outer wall of the pump shaft 3, sealing rings are provided in the two positioning grooves, and the outer walls of the two sealing rings are in contact and sealed with the inner walls of the two connecting rings 7a2 respectively.

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

Claims

1. A centrifugal water pump shaft support structure, comprising a support frame (1), the support frame (1) having a horizontally arranged cylinder (1a) through which a pump shaft (3) passes, both ends of the cylinder (1a) being connected to the pump shaft (3) via bearings (2), oil holes (1b) vertically passing through the upper and lower sides of the middle of the cylinder (1a), cover plates (5) being pressed and fixed on both end surfaces of the cylinder (1a), both cover plates (5) being provided with a center hole through which the pump shaft (3) passes, and an annular oil seal (6) being provided in the center hole to form a seal between the corresponding cover plate (5) and the pump shaft (3), wherein: An annular retaining frame (7) is provided between the two bearings (2) and the corresponding annular oil seal (6). The retaining frame (7) is sleeved and fixed on the pump shaft (3), and a seal is formed between the inner wall of the retaining frame (7) and the outer wall of the pump shaft (3). The retaining frame (7) comprises a frame body (7a) having an L-shaped axial cross section. The frame body (7a) comprises a retaining ring (7a1) and a connecting ring (7a2) which are vertically arranged, and the retaining ring (7a1) is located between the connecting ring (7a2) and the bearing (2). The outer diameter of the retaining ring (7a1) is larger than the inner diameter of the annular oil seal (6). A convex ring (7b) is formed on the outer wall of the connecting ring (7a2), and the convex ring (7b) is located in the annular oil seal (6). An annular groove (7c) coaxial with the retaining frame (7) is formed between the convex ring (7b) and the frame body (7a).

2. The centrifugal water pump shaft support structure according to claim 1, characterized in that: The frame (7a) is tightly fitted and fixedly connected to the pump shaft (3).

3. The centrifugal water pump shaft support structure according to claim 2, characterized in that: An annular step (3a) is provided on the outer wall of the pump shaft (3), and there are two annular steps (3a) which are symmetrically distributed along the axis of the pump shaft (3); the annular step (3a) is composed of an annular side wall and an annular bottom wall, the inner walls of the frame (7a) and the annular oil seal (6) are in contact with the annular side wall for sealing, and the retaining ring (7a1) is pressed on the annular bottom wall.

4. The centrifugal water pump shaft support structure according to claim 3, characterized in that: The inner hole of the retaining ring (7a1) is a tapered hole (7d), the diameter of the tapered hole (7d) gradually increases from the retaining ring (7a1) toward the bearing (2), and the maximum diameter of the tapered hole (7d) is smaller than the outer diameter of the annular bottom wall.

5. The centrifugal water pump shaft support structure according to claim 1, characterized in that: The retaining frame (7) is an integrated structure.

6. The centrifugal water pump shaft support structure according to claim 5, characterized in that: The retaining frame (7) is made of plastic material and is formed in one go by injection molding.

7. The centrifugal water pump shaft support structure according to claim 1, characterized in that: The annular groove (7c) has an axial cross section in the shape of a ring.

8. The centrifugal water pump shaft support structure according to claim 1, characterized in that: Two annular positioning grooves are provided on the outer wall of the pump shaft (3), sealing rings are provided in the two positioning grooves, and the outer walls of the two sealing rings are in contact and sealed with the inner walls of the two connecting rings (7a2) respectively.

Images