Sealing structure for motor shaft and upper end cover in deep-well pump

Abstract

The utility model provides a sealing structure for a motor shaft and an upper end cover in a deep-well pump, and belongs to the technical field of water pumps. The problem that an existing sealing structure is short in service life is solved. In the utility model, an upper end cover is provided with a central hole through which the upper end of a motor shaft passes, a sealing structure comprises a mechanical seal arranged in the lower end of the central hole, the upper end of the motor shaft is tightly sleeved with a first oil seal, the first oil seal comprises a first framework and a first rubber body covering one side of the first framework, and the first framework comprises a main body with an L-shaped axial section; the main body is composed of a horizontally-arranged upper ring and a vertically-arranged lower ring, and the inner side of the first rubber body is clamped between the lower ring and a motor shaft; a second oil seal is fixed to the front side of the upper end cover in a sealed mode and located below the upper ring, and a first sealing lip is arranged on the inner side of the second oil seal, located on the other side of the first framework and pressed on the lower ring. The LED lamp is long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of water pumps and relates to a deep well pump, in particular to a sealing structure of a motor shaft and an upper end cover in a deep well pump. Background Art

[0002] A deep well pump is a pump that is immersed in a groundwater well to pump and transport water. It is widely used in farmland irrigation and drainage, industrial and mining enterprises, urban water supply and drainage, and sewage treatment.

[0003] The motor sealing structure is an important component of the deep well pump. Its structure is disclosed in the Chinese Patent Library as a multi-sealed motor for a deep well pump (application number: 201510094311.3), which includes: a housing, a rotating shaft, a front cover, and a rear cover; wherein the front cover is fixedly connected to one end of the housing, the rear cover is fixedly connected to the other end of the housing, the rotating shaft is arranged in the housing and is rotatably connected to the front cover and the rear cover respectively through bearings, the housing is filled with insulating oil, a large balancing oil bag is fixedly connected to the outside of the rear cover, and a first mechanical seal is provided on the side of the front cover close to the rotating shaft; the front cover is also provided with a second mechanical seal and a balancing seal outside the first mechanical seal. Groove, insulating oil is filled between the balancing groove and the second mechanical seal, and a small balancing oil bag is arranged in the balancing groove; the first mechanical seal is a single-end mechanical seal; the second mechanical seal is a double-end mechanical seal arranged on the inner circumferential side of the front end cover, the balancing groove is arranged on the outer circumferential side of the front end cover, the balancing groove is communicated with the inner circumferential side of the front end cover, and together with the second mechanical seal forms a sealed space to accommodate insulating oil and the small balancing oil bag; a sand throwing seat is fixedly connected to the side of the front end cover away from the rear end cover, the top of the sand throwing seat is provided with an annular convex rib, a sand throwing cup is sleeved on the rotating shaft, and one end of the sand throwing cup is provided with an annular groove matching the annular convex rib.

[0004] In the above-mentioned motor, a labyrinth seal is formed between the sand throwing cup and the sand throwing seat to achieve a sand-proof effect. However, in actual use, smaller sand particles may get stuck in the labyrinth channel, aggravating the wear between the sand throwing cup and the sand throwing seat and affecting the service life. Utility Model Content

[0005] The utility model aims at the above problems existing in the prior art and proposes a sealing structure of a motor shaft and an upper end cover in a deep well pump with a long service life.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a sealing structure of a motor shaft and an upper end cover in a deep well pump, the upper end cover is provided with a center hole through which the upper end of the power supply motor shaft passes, the sealing structure includes a mechanical seal arranged in the lower end of the center hole, characterized in that a first oil seal is tightly sleeved on the upper end of the motor shaft, the first oil seal includes a first skeleton and a first rubber body covering one side of the first skeleton, the first skeleton and the first rubber body are both annular, the first skeleton includes a main body with an L-shaped axial cross-section, the main body is composed of a horizontally arranged upper ring and a vertically arranged lower ring, and the inner side of the first rubber body is clamped between the lower ring and the motor shaft; a second oil seal is sealed and fixed on the front side of the upper end cover, and the second oil seal and the upper end cover are coaxially arranged, the second oil seal is below the upper ring, and the inner side of the second oil seal has a sealing lip 1, the sealing lip 1 is on the other side of the first skeleton and pressed on the lower ring.

[0007] The sealing lip of the second oil seal is pressed onto the lower ring to form a seal with the first oil seal, and the second oil seal is located below the upper ring so that the upper ring forms a barrier above the sealing lip, effectively blocking sand from flowing to the sealing lip, ensuring a reliable and stable seal between the first oil seal and the second oil seal, effectively extending the sealing performance, and thus improving the service life of the sealing structure.

[0008] In the sealing structure of the motor shaft and the upper end cover in the deep well pump, the outer side of the upper ring is bent downward to form an annular rib, the outer side of the first rubber body is extended downward to form a baffle ring that wraps around the annular rib, and the sealing lip 1 is located inside the baffle ring. The first rubber body extends downward to form a baffle ring, and the sealing lip 1 is located inside the baffle ring, so that the baffle ring can further block the sand from flowing in the radial direction toward the sealing lip 1, ensuring a more reliable seal between the first oil seal and the second oil seal.

[0009] In the sealing structure of the motor shaft and the upper end cover in the above-mentioned deep well pump, the outer side surface of the retaining ring is a conical surface with a diameter gradually increasing from top to bottom, so as to guide the sand attached thereto outwards and further prevent the sand from contacting the sealing lip.

[0010] In the sealing structure of the motor shaft and the upper end cover in the above-mentioned deep well pump, a sheath is also mounted and fixed on the upper end cover, the second oil seal is located inside the sheath, and the lower end of the retaining ring extends into the sheath, thereby further increasing the difficulty of sand particles contacting the sealing lip.

[0011] In the sealing structure of the motor shaft and the upper end cover in the above-mentioned deep well pump, the inner side of the second oil seal is also provided with a sealing lip 2, and the sealing lip 1 and the sealing lip 2 are successively distributed up and down along the axial direction of the motor shaft, and the sealing lip 2 is also pressed on the lower ring to further enhance the sealing effect formed between the first oil seal and the second oil seal.

[0012] In the sealing structure of the motor shaft and the upper end cover in the above-mentioned deep well pump, a support ring is formed at the upper end of the upper end cover, and the support ring is coaxially arranged with the upper end cover, the second oil seal includes an annular frame and an upper annular rubber body and a lower annular rubber body respectively arranged at the upper end and the lower end of the annular frame, the outer wall of the lower annular rubber body is in close contact with the inner wall of the support ring, and the above-mentioned sealing lip 1 and sealing lip 2 are both formed on the upper annular rubber body. The second oil seal is fixedly connected to the upper end cover by clamping its lower end in the support ring, and has the advantages of simple structure and convenient installation.

[0013] In the sealing structure of the motor shaft and the upper end cover in the above-mentioned deep well pump, a sealing lip three is formed on the inner side of the lower annular rubber body, and the sealing lip three is pressed on the motor shaft to enhance the sealing performance formed between the motor shaft and the upper end cover.

[0014] In the sealing structure of the motor shaft and the upper end cover in the above-mentioned deep well pump, the axial cross-section of the middle part of the annular skeleton is L-shaped, and the upper end of the middle part of the annular skeleton is pressed on the top surface of the support ring, which is used for the second oil seal installation limit, so that the second oil seal can be installed in place at one time, which is convenient for assembly.

[0015] Compared with the prior art, the sealing structure of the motor shaft and the upper end cover in the deep well pump has the following advantages:

[0016] 1. The sealing lip of the second oil seal is pressed on the lower ring to form a seal with the first oil seal, and the second oil seal is located below the upper ring, so that the upper ring forms a barrier above the sealing lip, effectively blocking the flow of sand to the sealing lip, ensuring a reliable and stable seal between the first oil seal and the second oil seal, effectively extending the sealing performance, thereby improving the life of the sealing structure.

[0017] 2. The first rubber body extends downward to form a retaining ring, and the sealing lip 1 is located inside the retaining ring, so that the retaining ring can further block the sand from flowing toward the sealing lip 1 in the radial direction, ensuring a more reliable seal between the first oil seal and the second oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0020] Figure 3 It is a schematic cross-sectional view of the first oil seal.

[0021] In the figure, 1, upper end cover; 1a, support ring; 2, motor shaft; 3, mechanical seal; 4, first oil seal; 4a, first skeleton; 4b, first rubber body; 4c, upper ring; 4d, lower ring; 4e, annular rib; 4f, retaining ring; 4f1, conical surface; 5, second oil seal; 5a, annular skeleton; 5b, upper annular rubber body; 5b1, sealing lip one; 5b2, sealing lip two; 5c, lower annular rubber body; 5c1, sealing lip three; 6, sheath. 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, in the sealing structure of the motor shaft and the upper end cover in the deep well pump, a center hole is provided on the upper end cover 1 through which the upper end of the power supply motor shaft 2 passes, and the center hole and the upper end cover 1 are coaxially arranged; the sealing structure includes a mechanical seal 3 arranged in the lower end of the center hole, and the structure and installation method of the mechanical seal 3 are both existing and will not be described in detail here.

[0024] Further explanation, the sealing structure also includes a first oil seal 4 which is tightly sleeved on the upper end of the motor shaft 2. The first oil seal 4 is a skeleton oil seal, which includes a first skeleton 4a and a first rubber body 4b covering one side of the first skeleton 4a. The first skeleton 4a and the first rubber body 4b are both annular and coaxially arranged with the motor shaft 2. The first skeleton 4a includes a main body with an L-shaped axial cross section, which is composed of a horizontally arranged upper ring 4c and a vertically arranged lower ring 4d. The upper ring 4c is located on the upper side of the lower ring 4d, and the inner side of the first rubber body 4b is clamped between the lower ring 4d and the motor shaft 2. Figure 1 and Figure 2 As shown, a second oil seal 5 is sealed and fixed on the front side of the upper end cover 1, and the second oil seal 5 and the upper end cover 1 are coaxially arranged, the second oil seal 5 is located below the upper ring 4c, and the inner side of the second oil seal 5 has a sealing lip 5b1, which is located on the other side of the first skeleton 4a and pressed on the lower ring 4d, so that a reliable seal is formed between the first oil seal 4 and the second oil seal 5.

[0025] The sealing lip 5b1 of the second oil seal 5 is pressed onto the lower ring 4d to form a seal with the first oil seal 4, and the second oil seal 5 is located below the upper ring 4c, so that the upper ring 4c forms a barrier above the sealing lip 5b1, effectively blocking sand from flowing to the sealing lip 5b1, ensuring a reliable and stable seal between the first oil seal 4 and the second oil seal 5, effectively extending the sealing performance, thereby improving the service life of the sealing structure.

[0026] Further explanation, such as Figure 2 and Figure 3As shown, the outer side of the upper ring 4c is bent downward to form an annular rib 4e, and the annular rib 4e is coaxially arranged with the first frame 4a. The outer side of the first rubber body 4b extends downward to form a baffle ring 4f that wraps around the annular rib 4e, and the sealing lip 5b1 is located inside the baffle ring 4f. The first rubber body 4b extends downward to form a baffle ring 4f, and the sealing lip 5b1 is located inside the baffle ring 4f, so that the baffle ring 4f can further block the sand from flowing in the direction of the sealing lip 5b1 in the radial direction, ensuring a more reliable seal between the first oil seal 4 and the second oil seal 5. Preferably, the outer side surface of the baffle ring 4f is a conical surface 4f1 whose diameter gradually increases from top to bottom, so as to guide the sand attached thereto outward, and further prevent the sand from contacting the sealing lip 5b1.

[0027] like Figure 2 As shown, a sheath 6 is also sleeved and fixed on the upper end cover 1, the second oil seal 5 is located inside the sheath 6, and the lower end of the retaining ring 4f extends into the sheath 6, thereby further increasing the difficulty of sand particles contacting the sealing lip 1 5b1. In actual products, the sheath 6 is fixedly connected to the front end cover by a circle of screws, and the screws are arranged vertically.

[0028] In this embodiment,

[0029] The installation method of the second oil seal 5 is as follows: the upper end of the upper end cover 1 is integrally formed with a support ring 1a, and the support ring 1a is coaxially arranged with the upper end cover 1. The second oil seal 5 is also a skeleton oil seal, which includes an annular skeleton 5a and an upper annular rubber body 5b and a lower annular rubber body 5c respectively arranged at the upper end and the lower end of the annular skeleton 5a, and the annular skeleton 5a, the upper annular rubber body 5b, the lower annular rubber body 5c and the motor shaft 2 are coaxially arranged. Among them, the outer wall of the lower annular rubber body 5b is in close contact with the inner wall of the support ring 1a, and the inner side of the lower annular rubber body 5c is formed with a sealing lip 3 5c1, and the sealing lip 3 5c1 is pressed on the motor shaft 2 to strengthen the sealing performance formed between the motor shaft 2 and the upper end cover 1; the above-mentioned sealing lip 1 5b1 is formed on the upper annular rubber body 5b. The second oil seal 5 is sealed and fixedly connected with the upper end cover 1 by clamping its lower end in the support ring 1a, and has the advantages of simple structure and convenient installation. Further explanation: the axial cross section of the middle part of the annular skeleton 5a is L-shaped, and the upper end of the middle part of the annular skeleton 5a is pressed on the top surface of the support ring 1a, which is used to limit the installation of the second oil seal 5, so that the second oil seal 5 can be installed in place at one time, which is convenient for assembly.

[0030] In the actual product, the inner side of the upper annular rubber body 5b also has a sealing lip 2 5b2. The sealing lip 1 5b1 and the sealing lip 2 5b2 are distributed in sequence up and down along the axial direction of the motor shaft 2, and the sealing lip 2 5b2 is also pressed on the lower ring 4d to further strengthen the sealing effect formed between the first oil seal 4 and the second oil seal 5.

[0031] 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 sealing structure for a motor shaft and an upper end cover in a deep well pump, wherein the upper end cover (1) is provided with a central hole through which the upper end of the motor shaft (2) passes, and the sealing structure includes a mechanical seal (3) arranged in the lower end of the central hole, characterized in that: A first oil seal (4) is tightly mounted on the upper end of the motor shaft (2). The first oil seal (4) comprises a first frame (4a) and a first rubber body (4b) covering one side of the first frame (4a). The first frame (4a) and the first rubber body (4b) are both annular. The first frame (4a) comprises a main body with an L-shaped axial cross section. The main body is composed of a horizontally arranged upper ring (4c) and a vertically arranged lower ring (4d). The inner side of the first rubber body (4b) is clamped between the lower ring (4d) and the motor shaft (2). A second oil seal (5) is sealed and fixed on the front side of the upper end cover (1). The second oil seal (5) and the upper end cover (1) are coaxially arranged. The second oil seal (5) is located below the upper ring (4c). The inner side of the second oil seal (5) has a sealing lip 1 (5b1). The sealing lip 1 (5b1) is located on the other side of the first frame (4a) and pressed on the lower ring (4d).

2. The sealing structure of the motor shaft and the upper end cover in the deep well pump according to claim 1, characterized in that: The outer side of the upper ring (4c) is bent downward to form an annular retaining edge (4e), and the outer side of the first rubber body (4b) is extended downward to form a retaining ring (4f) that surrounds the annular retaining edge (4e), and the sealing lip 1 (5b1) is located on the inner side of the retaining ring (4f).

3. The sealing structure of the motor shaft and the upper end cover in the deep well pump according to claim 2, characterized in that: The outer side surface of the retaining ring (4f) is a conical surface (4f1) whose diameter gradually increases from top to bottom.

4. The sealing structure of the motor shaft and the upper end cover in the deep well pump according to claim 2 or 3, characterized in that: A protective sleeve (6) is also sleeved and fixed on the upper end cover (1), the second oil seal (5) is located inside the protective sleeve (6), and the lower end of the retaining ring (4f) extends into the protective sleeve (6).

5. The sealing structure of the motor shaft and the upper end cover in the deep well pump according to claim 1, characterized in that: The second oil seal (5) also has a second sealing lip (5b2) on the inner side. The first sealing lip (5b1) and the second sealing lip (5b2) are sequentially distributed up and down along the axial direction of the motor shaft (2), and the second sealing lip (5b2) is also pressed on the lower ring (4d).

6. The sealing structure of the motor shaft and the upper end cover in the deep well pump according to claim 5, characterized in that: A support ring (1a) is formed at the upper end of the upper end cover (1), and the support ring (1a) is coaxially arranged with the upper end cover (1). The second oil seal (5) comprises an annular frame (5a) and an upper annular rubber body (5b) and a lower annular rubber body (5c) respectively arranged at the upper end and the lower end of the annular frame (5a). The outer wall of the lower annular rubber body (5c) is in close contact with the inner wall of the support ring (1a). The above-mentioned sealing lip 1 (5b1) and sealing lip 2 (5b2) are both formed on the upper annular rubber body (5b).

7. The sealing structure of the motor shaft and the upper end cover in the deep well pump according to claim 6, characterized in that: A sealing lip three (5c1) is formed on the inner side of the lower annular rubber body (5c), and the sealing lip three (5c1) is pressed onto the motor shaft (2).

8. The sealing structure of the motor shaft and the upper end cover in the deep well pump according to claim 6, characterized in that: The axial cross-section of the middle portion of the annular skeleton (5a) is L-shaped, and the upper end of the middle portion of the annular skeleton (5a) is pressed onto the top surface of the support ring (1a).

Images