Novel sealing structure of submersible motor for well

Abstract

The utility model discloses a novel sealing structure of a submersible motor for a well, which comprises a clamp spring, an oil cylinder cover, and a static ring and a moving ring which are mechanically sealed, the clamp spring tightly presses the static ring and the moving ring which are mechanically sealed on the oil cylinder cover, the static ring comprises a sealing washer and a static ring pressing ring, and a circle of annular pressing groove is arranged on the outer edge of the bottom of the static ring pressing ring. The bottom of the oil cylinder cover is fixedly connected with an annular static ring pressing plate, and the inner edge of the static ring pressing plate is blocked below the annular pressing groove of the static ring pressing ring to play a limiting role. When the sealing structure is used, internal thermal expansion pressure pushes the static ring outwards, the lower portion of the static ring pressing plate can abut against the upper limit of the static ring pressing plate at the moment, the static ring is prevented from further moving downwards, the situation that a gap exists between the static ring and an oil cylinder cover due to the internal thermal expansion pressure is avoided, and the sealing effect is better than that of an existing structure. The risk that external fluid enters the motor is reduced, and the service life of the water pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of well-used submersible motor structures, in particular to a novel sealing structure of a well-used submersible motor. Background Art

[0002] A water pump is a general-purpose mechanical device used to transport or pressurize liquids. A submersible well pump has a motor directly connected to the pump. It's essential for pumping water from deep wells. Submersible well pumps submerge underwater to bring groundwater to the surface. They are widely used in applications such as domestic water supply, mine rescue, industrial cooling, farmland irrigation, seawater lifting, ship load adjustment, and fountain landscapes.

[0003] like Figure 1 As shown, a conventional submersible well pump motor includes a barrel, with upper and lower bearing seats 1 positioned above and below the barrel, respectively. An oil reservoir is located beneath the lower bearing seat. The stator, rotor, and bearings are located between the upper and lower bearing seats. The oil reservoir houses a mechanical seal assembly and is filled with oil. A cylinder head 2 is located at the bottom of the oil reservoir. The submersible well motor seal structure is located at the bottom of the cylinder head.

[0004] like Figure 2 As shown, the sealing structure of this submersible motor for wells only uses a retaining ring 6 to compress the stationary ring 4 and dynamic ring 5 of the mechanical seal 3 against the cylinder head, pressing the cylinder head against the lower bearing seat to achieve a seal. However, during actual motor operation, internal thermal expansion pressure can create a gap between the stationary ring and the cylinder head, allowing water to enter the cylinder head. Utility Model Content

[0005] In order to solve the above technical problems, the utility model designs a novel sealing structure of a submersible motor for wells.

[0006] The utility model adopts the following technical solutions:

[0007] A new type of sealing structure for a submersible motor for a well includes a retaining spring, a cylinder cover, a static ring and a dynamic ring of a mechanical seal. The retaining spring presses the static ring and the dynamic ring of the mechanical seal on the cylinder cover. The static ring includes a sealing gasket and a static ring pressure ring. An annular pressure groove is provided on the outer edge of the bottom of the static ring pressure ring. An annular static ring pressure plate is fixedly connected to the bottom of the cylinder cover. The inner edge of the static ring pressure plate is blocked below the annular pressure groove of the static ring pressure ring to serve as a limit.

[0008] Preferably, the static ring pressure plate is fixed to the bottom of the cylinder head by welding.

[0009] Preferably, the sealing gasket is a rubber gasket.

[0010] Preferably, the static ring pressure ring is a ceramic ring.

[0011] Preferably, the moving ring comprises a bottom frame, an upper pressing frame, stainless steel springs, a sealing ring and a moving ring pressing ring, the stainless steel springs are arranged between the bottom frame and the upper pressing frame, and the sealing ring and the moving ring pressing ring are sequentially arranged on the upper pressing frame.

[0012] Preferably, the moving ring pressing ring is a graphite ring.

[0013] The utility model discloses beneficial effects are: (1), the utility model discloses setting up static ring pressing plate, and the annular pressing groove is set up on static ring pressing ring, reduces static ring movement space, and the location effect is started, avoids the gap that will cause static ring and oil cylinder cover to exist because of internal thermal expansion pressure, has better sealing effect than previous structure, reduces the risk that external fluid enters motor, and then increases the service life of water pump, (2), static ring pressing plate adopts welding fixed, effectively improves processing efficiency and reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a kind of structural schematic diagram of prior submersible pump motor;

[0015] Figure 2 is Figure 1 a kind of enlarged view in I of

[0016] Figure 3 is a kind of structural schematic diagram of the utility model submersible pump motor;

[0017] Figure 4 is Figure 3 a kind of enlarged view in II of

[0018] In the drawing: 1, lower bearing seat, 2, oil cylinder cover, 3, mechanical seal, 4, static ring, 5, moving ring, 6, clasp spring, 7, bottom frame, 8, upper pressing frame, 9, stainless steel spring, 10, sealing ring, 11, moving ring pressing ring, 12, sealing washer, 13, static ring pressing ring, 14, annular pressing groove, 15, static ring pressing plate. DETAILED DESCRIPTION

[0019] The technical scheme of the utility model will be further specifically described below by specific embodiments and in conjunction with the drawings:

[0020] Embodiment: as shown in Figure 3 and Figure 4 A new type of well submersible motor sealing structure, including clasp spring, oil cylinder cover, the static ring and moving ring of mechanical seal, clasp spring is pressed to the static ring and moving ring of mechanical seal on oil cylinder cover, the static ring includes sealing washer 12 and static ring pressing ring 13, and a ring-shaped pressing groove 14 is formed in the bottom outer edge of the static ring pressing ring, the bottom of the oil cylinder cover is fixedly connected with a ring-shaped static ring pressing plate 15, and the inner edge of the static ring pressing plate is blocked below the annular pressing groove of the static ring pressing ring, so as to limit the position.

[0021] The static ring pressing plate is fixed on the bottom of the oil cylinder cover by welding. The sealing gasket is a rubber gasket. The static ring pressing ring is a ceramic ring.

[0022] The dynamic ring comprises a bottom frame 7, an upper pressing frame 8, stainless steel springs 9, a sealing ring 10 and a dynamic ring pressing ring 11. The stainless steel springs are arranged between the bottom frame and the upper pressing frame. The sealing ring and the dynamic ring pressing ring are sequentially arranged on the upper pressing frame. The dynamic ring pressing ring is a graphite ring.

[0023] When the utility model is used, the internal thermal expansion pressure pushes the static ring outward, at this time, the lower part of the static ring pressing plate will be limited on the static ring pressing plate, prevents the static ring from further moving downward, avoids the gap between the static ring and the oil cylinder cover caused by the internal thermal expansion pressure, has better sealing effect than the previous structure, reduces the risk of external fluid entering the motor, and further increases the service life of the water pump.

[0024] The above-described embodiment is only a preferred scheme of the utility model, and does not limit the utility model in any form. Other variants and modifications can be made without exceeding the technical scheme recorded in the claims.

Claims

1. A new type of sealing structure for a submersible motor for a well, comprising a retaining spring, a cylinder cover, a static ring and a dynamic ring of a mechanical seal, wherein the retaining spring presses the static ring and the dynamic ring of the mechanical seal against the cylinder cover, and is characterized in that: The static ring includes a sealing gasket and a static ring pressure ring. A circle of annular pressure groove is provided on the outer edge of the bottom of the static ring pressure ring. A ring-shaped static ring pressure plate is fixedly connected to the bottom of the cylinder head. The inner edge of the static ring pressure plate is blocked under the annular pressure groove of the static ring pressure ring to play a limiting role.

2. A new type of well submersible motor sealing structure according to claim 1, characterized in that: The static ring pressure plate is fixed to the bottom of the cylinder cover by welding.

3. A new type of well submersible motor sealing structure according to claim 1, characterized in that: The sealing gasket is a rubber gasket.

4. A new type of well submersible motor sealing structure according to claim 1, characterized in that: The static ring pressure ring is a ceramic ring.

5. A new type of well submersible motor sealing structure according to claim 1, characterized in that: The dynamic ring includes a base frame, an upper pressure frame, a stainless steel spring, a sealing ring and a dynamic ring pressure ring. The stainless steel spring is installed between the base frame and the upper pressure frame, and the sealing ring and the dynamic ring pressure ring are installed on the upper pressure frame in sequence.

6. A new type of sealing structure for a submersible motor for a well according to claim 5, characterized in that: The dynamic ring pressure ring is a graphite ring.

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