Sealing structure of submersible electric pump

Abstract

The utility model belongs to the technical field of water pumps, in particular to a sealing structure of a submersible electric pump, which comprises a static ring mounted on a motor casing and a moving ring component sleeved on an electric pump shaft, the moving ring component comprises a friction ring and a spring, the lower end face of the friction ring is abutted against and sealed with the static ring, and the spring enables the friction ring to be tightly attached to the static ring through elastic force. A protective cover circumferentially fixed to the electric pump shaft covers the movable ring assembly, a limiting part for limiting the protective cover is arranged between the protective cover and the electric pump shaft, and the protective cover comprises a mounting sleeve circumferentially fixed to the electric pump shaft, a protective sleeve arranged outside the movable ring assembly in a covering mode and a connecting plate connected with the mounting sleeve and the protective sleeve. The upper end of the spring abuts against the connecting plate, and the lower end of the spring is pressed on the friction ring. Water flow can be effectively prevented from impacting the moving ring assembly, the moving ring assembly is further prevented from swinging due to the water flow, and sealing is not prone to failure; and the spring is free of sediment scouring, abrasion caused by sediment scouring is effectively avoided, and the service life of the mechanical seal is long.

Description

Technical fields:

[0001] This utility model belongs to the field of water pump technology, and specifically refers to a sealing structure for a submersible electric pump. Background technology:

[0002] Submersible electric pumps typically use mechanical seals to seal the pump shaft 1 and the motor housing 2, such as... Figure 1 As shown, the mechanical seal includes a stationary ring 3 mounted on the motor housing 2 and a rotating ring assembly fitted on the pump shaft 1. The rotating ring assembly includes, from top to bottom, an upper spring seat 4, a spring 5, a lower spring seat 6, a rubber sleeve 7, and a friction ring 8. The upper end of the spring 5 abuts against the upper spring seat 4, and the lower end abuts against the lower spring seat 6. The upper end of the rubber sleeve 7 is tightly fitted to the pump shaft 1, and the lower end is tightly fitted to the friction ring 8. The lower spring seat 6 is fitted outside the rubber sleeve 7 and pressed against the friction ring 8 by the rubber sleeve 7. The sealing of the mechanical seal is mainly achieved by the contact between the friction ring 8 and the stationary ring 3.

[0003] The shortcomings of the above-mentioned sealing structure are: during operation, the pumped water will impact the upper spring seat 4, spring 5, lower spring seat 6, rubber sleeve 7 and friction ring 8 of the mechanical seal, causing the dynamic ring assembly to swing, which in turn leads to seal failure; at the same time, the pumped water often contains silt, and the wear caused by the silt on the spring 5 reduces the pressure of the spring 5, thereby accelerating the failure of the mechanical seal. Summary of the Invention:

[0004] The purpose of this invention is to provide a sealing structure for a submersible pump that can effectively prevent water flow from impacting the moving ring assembly, thereby preventing the moving ring assembly from swinging due to water flow and making the seal less prone to failure; moreover, the spring is not subject to erosion by mud and sand, effectively avoiding wear caused by erosion by mud and sand, and extending the service life of the mechanical seal.

[0005] This utility model is implemented as follows:

[0006] A sealing structure for a submersible electric pump includes a stationary ring mounted on a motor housing and a rotating ring assembly fitted on a pump shaft. The rotating ring assembly includes a friction ring whose lower end face abuts and seals against the stationary ring, and a spring that keeps the friction ring tightly against the stationary ring. The rotating ring assembly is covered by a protective cover that is circumferentially fixed to the pump shaft. A limiting member is provided between the protective cover and the pump shaft to limit the upper position of the protective cover. The protective cover includes a mounting sleeve that is circumferentially fixed to the pump shaft, a protective sleeve that covers the rotating ring assembly, and a connecting plate that connects the mounting sleeve and the protective sleeve. The upper end of the spring abuts against the connecting plate, and the lower end presses against the friction ring.

[0007] In the submersible electric pump sealing structure, the mounting sleeve is sleeved on the electric pump shaft, and the mounting sleeve is located above the connecting plate, the electric pump shaft is provided with a key groove, the limiting piece is a key arranged on the key groove, the upper end of the mounting sleeve is outwardly protruding to form an open slot matched with the key, the open slot is upwardly open, the key is limited by the bottom surface of the open slot, and the mounting sleeve is fixed in the circumferential direction by the key and the electric pump shaft.

[0008] In the submersible electric pump sealing structure, the limiting piece can also be a limiting pin arranged on the electric pump shaft, the mounting sleeve is provided with a waist-shaped hole arranged in the vertical direction in the length direction, and the mounting sleeve is fixed in the circumferential direction by the limiting pin and the electric pump shaft.

[0009] In the submersible electric pump sealing structure, the inner diameter D of the mounting sleeve is 2-3 times the length H of the mounting sleeve.

[0010] In the submersible electric pump sealing structure, the protective sleeve is in a stepped shape, comprising a small sleeve located above and a large sleeve arranged below the small sleeve, and the upper end of the small sleeve is connected to the connecting plate, the small sleeve surrounds the outer periphery of the spring, and the large sleeve surrounds the outer periphery of the friction ring.

[0011] In the submersible electric pump sealing structure, the friction ring is fixed in the circumferential direction on the electric pump shaft through a rubber sleeve, the upper end of the rubber sleeve is sleeved on the outer periphery of the electric pump shaft and tightly matched with the electric pump shaft, the lower end of the rubber sleeve is sleeved on the outer periphery of the friction ring and tightly matched with the friction ring, the rubber sleeve is sleeved with a spring seat, the lower end of the spring abuts against the spring seat, and the spring is pressed on the friction ring through the spring seat and the rubber sleeve.

[0012] In the submersible electric pump sealing structure, the protective sleeve is integrally formed by stainless steel.

[0013] In the submersible electric pump sealing structure, the protective sleeve can be formed by punching stainless steel or spinning stainless steel.

[0014] In the submersible electric pump sealing structure, the thickness S of the protective sleeve is 1mm-5mm.

[0015] Compared with the prior art, the utility model has the advantages of:

[0016] 1、The utility model discloses a protective sleeve of a protective cover is arranged outside a dynamic ring assembly on an electric pump shaft, which can effectively prevent water flow from impacting the dynamic ring assembly, thereby avoiding the dynamic ring assembly from swinging due to water flow and the sealing from being easily invalid.

[0017] 2, the utility model discloses the installation sleeve is installed on the electric pump shaft, and is radially limited on the electric pump shaft, guarantees the cover to be not swing when being washed by water, and key can be to the installation sleeve is fixed in the circumference, can also be to the installation sleeve is limited to the upper limit, and the design is ingenious, and simple structure, and the installation process does not need special technology and high skilled staff, and the installation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the sectional view of prior art;

[0019] Figure 2 is the sectional view of the utility model;

[0020] Figure 3 is Figure 2 the enlarged view of A of

[0021] Figure 4 is the sectional view of the cover of the utility model.

[0022] REFERENCE SIGNS

[0023] Figure 1 In the figure: 1, electric pump shaft;2, motor shell;3, static ring;4, upper spring seat;5, spring;6, lower spring seat;7, rubber sleeve;8, friction ring.

[0024] Figures 2-4 In the figure: 1, motor shell;2, static ring;3, electric pump shaft;4, friction ring;5, spring;6, cover;6a, installation sleeve;6b, protective sleeve;6b1, small sleeve;6b2, large sleeve;6c, connecting plate;7, keyway;8, key;9, open slot;10, rubber sleeve;11, spring seat. DETAILED DESCRIPTION

[0025] The utility model will be further described in specific embodiment, referring to Figures 2-4 :

[0026] A submersible electric pump sealing structure, including static ring 2 installed on motor shell 1 and dynamic ring assembly sleeved on electric pump shaft 3, the dynamic ring assembly includes the friction ring 4 of the lower end surface with static ring 2 resistance touch seal, and the spring 5 of the elastic force that makes the friction ring 4 adhere to static ring 2, the dynamic ring assembly cover is equipped with the cover 6 that is fixed in the circumference on electric pump shaft 3, and the limiting piece that is limited to the upper limit of cover 6 is equipped between cover 6 and electric pump shaft 3, the cover 6 includes the installation sleeve 6a that is fixed in the circumference on electric pump shaft 3, the protective sleeve 6b that covers in the dynamic ring assembly outside and the connecting plate 6c of connecting installation sleeve 6a and protective sleeve 6b, the spring 5 upper end abuts the connecting plate 6c, and lower end is pressed in the friction ring 4.

[0027] The working principle of the utility model: as Figures 2-4As shown, when the electric pump shaft 3 rotates, the dynamic ring assembly and the shroud 6 rotate together, the shroud 6 and the dynamic ring assembly rotate to drive the spring 5 to rotate, so as to ensure the normal operation of the mechanical seal, and the lower end surface of the friction ring 4 is tightly attached to the static ring 2 under the elastic force of the spring 5, so as to form a resistance sealing structure.

[0028] The utility model discloses a shroud 6 is arranged on the electric pump shaft 3, and the protective sleeve 6b of the shroud 6 is covered outside the dynamic ring assembly, can effectively prevent water flow from impacting the dynamic ring assembly, and further avoid the dynamic ring assembly from swinging due to water flow, and the sealing is not easy to fail, and the spring 5 is not silted, effectively avoids the abrasion caused by silt, and the service life of the mechanical seal is long.

[0029] The mounting structure of the shroud 6 is as shown in the figure, Figures 2-4 The mounting sleeve 6a is sleeved on the electric pump shaft 3, and the mounting sleeve 6a is located above the connecting plate 6c, the electric pump shaft 3 is provided with a key groove 7, the limiting piece is a key 8 arranged on the key groove 7, the upper end of the mounting sleeve 6a is outwardly protruded to form an opening groove 9 matched with the key 8, the opening groove 9 is upwardly opened, the key 8 is limited by the bottom surface of the opening groove 9, and the mounting sleeve 6a is fixed in the circumferential direction with the electric pump shaft 3 through the key 8. The mounting sleeve 6a is sleeved on the electric pump shaft 3 and is limited in the radial direction on the electric pump shaft 3, so that the shroud 6 is prevented from swinging when being washed by water, the key 8 can fix the mounting sleeve 6a in the circumferential direction and limit the mounting sleeve 6a in the upper direction, and the design is ingenious. The utility model has the advantages of simple structure, convenient installation, no special process and high-skilled workers required in the installation process.

[0030] The mounting steps of the shroud 6 are as follows: after the dynamic ring assembly is mounted, the shroud 6 is sleeved on the electric pump shaft 3, the shroud 6 is moved downward to press the spring 5, the key 8 is put into the key groove 7, the shroud 6 is loosened, and the shroud 6 is moved upward under the elastic force of the spring 5 until the bottom surface of the opening groove 9 is limited by the key 8.

[0031] In order to better limit the mounting sleeve 6a in the radial direction on the electric pump shaft 3, the inner diameter D of the mounting sleeve 6a is 2-3 times the length H of the mounting sleeve 6a, so that the shroud 6 is prevented from swinging when being washed by water. In the embodiment, the inner diameter D of the mounting sleeve 6a is 2.8 times the length H of the mounting sleeve 6a.

[0032] In order to better protect the dynamic ring assembly, as shown in the figure, Figure 2 、 4 The protective sleeve 6b is in a stepped shape and includes a small sleeve 6b1 located at the upper portion and a large sleeve 6b2 arranged below the small sleeve 6b1, the upper end of the small sleeve 6b1 is connected to the connecting plate 6c, the small sleeve 6b1 surrounds the outer periphery of the spring 5, and the large sleeve 6b2 surrounds the outer periphery of the friction ring 4.

[0033] The specific structure of the dynamic ring assembly: the friction ring 4 is fixed on the electric pump shaft 3 through the rubber sleeve 10, the upper end of the rubber sleeve 10 is sleeved on the outer side of the electric pump shaft 3 and tightly fitted with the electric pump shaft 3, the lower end of the rubber sleeve 10 is sleeved on the outer side of the friction ring 4 and tightly fitted with the friction ring 4, the spring seat 11 is sleeved on the outer side of the rubber sleeve 10, the lower end of the spring 5 abuts against the spring seat 11, and the spring 5 is pressed on the friction ring 4 through the spring seat 11 and the rubber sleeve 10. The friction ring 4 is driven by the rubber sleeve 10 to rotate with the electric pump shaft 3.

[0034] Further, the large sleeve 6b2 covers the outer side of the spring seat 11.

[0035] In order to reduce the assembly steps and firm connection, the shield 6 is integrally formed by stainless steel.

[0036] Further, the thickness S of the shield 6 is 1mm-5mm. In the embodiment, the thickness S of the shield 6 is 3mm. The weight is light, and the cost is low.

[0037] The utility model adopts the shield 6 to replace the upper spring seat of the original mechanical mechanical seal, although the cost increases 2.5 yuan-4 yuan, the cost increment is about 8%-12%, but can effectively resist the scouring of silt water, and the service life of the mechanical seal is prolonged by 3-5 times.

[0038] The above embodiment is only one of the preferred embodiments of the utility model, and does not limit the implementation range of the utility model, so: all equivalent changes made according to the shape, structure and principle of the utility model should be covered in the protection range of the utility model.

Claims

1. A submersible electric pump seal structure comprising a static ring (2) mounted on a motor casing (1) and a dynamic ring assembly fitted on an electric pump shaft (3), said dynamic ring assembly comprising a friction ring (4) having a lower end face in abutting sealing contact with the static ring (2) and a spring (5) exerting a force on the friction ring (4) to press it against the static ring (2), characterized in that: The moving ring assembly cover is provided with a shroud (6) fixed circumferentially on the electric pump shaft (3), a limiting piece is arranged between the shroud (6) and the electric pump shaft (3) to limit the upper position of the shroud (6), the shroud (6) comprises a mounting sleeve (6a) fixed circumferentially on the electric pump shaft (3), a protective sleeve (6b) covering the outside of the moving ring assembly, and a connecting plate (6c) connecting the mounting sleeve (6a) and the protective sleeve (6b), the upper end of the spring (5) abuts against the connecting plate (6c), and the lower end is pressed on the friction ring (4).

2. The submersible electric pump seal structure according to claim 1, wherein: The mounting sleeve (6a) is sleeved on the electric pump shaft (3), and the mounting sleeve (6a) is located above the connecting plate (6c), the electric pump shaft (3) is provided with a key groove (7), the limiting piece is a key (8) arranged on the key groove (7), the upper end of the mounting sleeve (6a) is outwardly convex to form an opening groove (9) matched with the key (8), the opening groove (9) is upwardly opened, the key (8) abuts against the bottom surface of the opening groove (9) to limit, and the mounting sleeve (6a) is circumferentially fixed with the electric pump shaft (3) through the key (8).

3. The submersible electric pump sealing structure according to claim 2, characterized in that: The inner diameter of the mounting sleeve (6a) is 2-3 times the length of the mounting sleeve (6a).

4. The submersible electric pump seal structure according to claim 1, wherein: The protective sleeve (6b) is in a stepped shape, comprising a small sleeve (6b1) located above and a large sleeve (6b2) arranged below the small sleeve (6b1), the upper end of the small sleeve (6b1) is connected to the connecting plate (6c), the small sleeve (6b1) surrounds the outer periphery of the spring (5), and the large sleeve (6b2) surrounds the outer periphery of the friction ring (4).

5. The submersible electric pump seal structure according to claim 1, wherein: The friction ring (4) is circumferentially fixed on the electric pump shaft (3) through a rubber sleeve (10), the upper end of the rubber sleeve (10) is sleeved on the electric pump shaft (3) and tightly fitted with the electric pump shaft (3), the lower end of the rubber sleeve (10) is sleeved on the friction ring (4) and tightly fitted with the friction ring (4), the rubber sleeve (10) is sleeved with a spring seat (11), the lower end of the spring (5) abuts against the spring seat (11), and is pressed on the friction ring (4) through the spring seat (11) and the rubber sleeve (10).

6. The submerged electric pump sealing structure according to claim 1, characterized in that: The shroud (6) is integrally formed of stainless steel.

7. The submersible electric pump sealing structure according to claim 6, characterized in that: The thickness of the shroud (6) is 1mm-5mm.

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