Novel sealing structure of submersible motor for well

Abstract

The utility model discloses a novel submersible motor sealing structure for a well, which comprises a machine barrel, a rotor, a coil, a cable pin, an upper bearing seat and an upper cover, a bearing, a clamp spring and a mechanical seal are sequentially sleeved on the rotor and positioned on the inner side of the upper bearing seat from bottom to top, the upper cover is crimped on the upper bearing seat, and a framework oil seal is mounted on the rotor and positioned on the outer side of the upper cover. A mechanical seal and a clamp spring are sequentially sleeved on the rotor and positioned on the outer side of the upper bearing seat from bottom to top; and the mechanical seal on the inner side of the upper bearing seat and the mechanical seal on the outer side of the upper bearing seat are symmetrically distributed. The mechanical seals are respectively arranged on the inner side and the outer side of the upper bearing seat, and the outer mechanical seal is basically not influenced by external water pressure, so that the submersible motor can dive deeper, the service time is longer, and the environment use requirement of a user on a deeper well is met.

Description

Technical Field

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

[0002] Current submersible pumps are generally used in combination with submersible motors and water pumps, or pump components are directly installed on the shaft extension end of the submersible motor to form a motor-pump-in-one product, which works underwater. Therefore, the motor part of the submersible pump requires good sealing.

[0003] like Figure 1 As shown, the existing sealing structure of a submersible motor for wells includes a barrel 1, rotor 3, coil 4, upper bearing seat 5, and upper cover 8. Insulation paper 2 is attached to the inside of the barrel. The rotor, located inside the upper bearing seat, is fitted with a bearing, a retaining ring, and a mechanical seal 6, sequentially arranged from bottom to top. The upper bearing seat is press-fitted with the upper cover, and a skeleton oil seal 9 is mounted on the rotor, located outside the upper cover. The outer skeleton oil seal in this structure is prone to failure due to long-term friction with the shaft, making it ineffective. Furthermore, only one mechanical seal is installed in the upper bearing seat, and the inner seal has limited resistance to external pressure. If the motor is submerged too deep, the one-way inner seal can easily be ruptured, leading to water intrusion into the motor. Consequently, the electric pump cannot meet the environmental requirements of users for deeper wells.

[0004] And the cable pin 7 of the existing well submersible motor sealing structure is installed with a wiring copper tube, and the bottom of the wiring copper tube is exposed. Figure 2 As shown, to connect the copper tube to the coil lead wire, the coil lead wire must first be soldered and then inserted into the copper tube of the pin. Each lead wire needs to be separated by two layers of insulating tubing. The insulating tubing is then wrapped around the copper tube at the bottom of the pin and secured with a cable tie to prevent the upper bearing seat from tilting and colliding with the mechanical seal during pin installation. The rotor is then secured with the upper bearing seat before being installed into the barrel. The upper bearing seat is supported against the barrel using auxiliary support 10, and finally, the pin is screwed into the upper bearing seat within the limited space. The screws must be manually tightened to position them before being tightened with a screwdriver. The installation process involves many steps, resulting in low production efficiency. Because the vertical space required for pin installation is limited, the O-ring is a radial seal, and the pin needs to be easily inserted into the upper bearing seat, resulting in a large gap and a high risk of seal failure. 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] The utility model provides a new type well submersible motor sealing structure, including machine cylinder, rotor, coil, cable pin, upper bearing seat and upper cover, is located in the upper bearing seat inside from below to above of rotor and is successively sleeved with bearing, clamping spring and mechanical seal, the upper bearing seat is pressed and is connected with the upper cover, is located in the upper cover outside of rotor and is installed with skeleton oil seal, the mechanical seal and clamping spring are successively sleeved from below to above in the upper bearing seat outside of rotor, the mechanical seal of upper bearing seat inside and the mechanical seal of upper bearing seat outside are symmetrically distributed.

[0008] As preferred, the upper cover bottom corresponds to the installation position of the mechanical seal outside the upper bearing seat, and an installation notch is formed.

[0009] As preferred, the cable pin is covered by a wiring copper pipe, and a wiring plug is inserted into the wiring copper pipe, and the wiring plug is connected to the coil through a wiring connection.

[0010] As preferred, the machine cylinder inside is attached to an upper bushing.

[0011] As preferred, a pin O-ring is installed between the cable pin and the upper bearing seat, and the cable pin is axially sealed with the upper bearing seat through the pin O-ring.

[0012] The utility model discloses a new type well submersible motor sealing structure, including machine cylinder, rotor, coil, cable pin, upper bearing seat and upper cover, is located in the upper bearing seat inside from below to above of rotor and is successively sleeved with bearing, clamping spring and mechanical seal, the upper bearing seat is pressed and is connected with the upper cover, is located in the upper cover outside of rotor and is installed with skeleton oil seal, the mechanical seal and clamping spring are successively sleeved from below to above in the upper bearing seat outside of rotor, the mechanical seal of upper bearing seat inside and the mechanical seal of upper bearing seat outside are symmetrically distributed. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic view of the existing well submersible motor sealing structure;

[0014] Figure 2 is a structural schematic view of the existing well submersible motor sealing structure during installation;

[0015] Figure 3 It is a structural schematic diagram of the utility model;

[0016] Figure 4 It is a structural diagram of the utility model when it is installed;

[0017] In the figure: 1. Barrel, 2. Insulation paper, 3. Rotor, 4. Coil, 5. Upper bearing seat, 6. Mechanical seal, 7. Cable pin, 8. Upper cover, 9. Skeleton oil seal, 10. Auxiliary support, 11. Upper bushing, 12. Wiring plug. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0019] Example: Figure 3 As shown, a new type of sealing structure of a submersible motor for wells includes a barrel 1, a rotor 3, a coil 4, a cable pin 7, an upper bearing seat 5 and an upper cover 8. The rotor is located on the inner side of the upper bearing seat and is sleeved with a bearing, a retaining ring and a mechanical seal 6 from bottom to top in sequence. The upper bearing seat is press-fitted with an upper cover. A skeleton oil seal 9 is installed on the rotor on the outer side of the upper cover. The rotor is located on the outer side of the upper bearing seat and is sleeved with a mechanical seal and a retaining ring from bottom to top in sequence. The mechanical seal on the inner side of the upper bearing seat and the mechanical seal on the outer side of the upper bearing seat are symmetrically distributed.

[0020] The bottom of the upper cover is provided with an installation slot corresponding to the mechanical seal installation position on the outer side of the upper bearing seat. The cable pin is covered with a wiring copper tube, and a wiring plug 12 is inserted into the wiring copper tube. The wiring plug is connected to the coil through wiring.

[0021] An upper bushing 11 is attached to the inside of the barrel. A pin O-ring is installed between the cable pin and the upper bearing seat, and the cable pin is axially sealed between the pin O-ring and the upper bearing seat.

[0022] The utility model is provided with mechanical seals on the inner and outer sides of the upper bearing seat respectively, and the outer machine seal is basically not affected by the external water pressure, which can ensure that the submersible motor dives deeper and has a longer service life, meeting the user's environmental use requirements for deeper wells; the utility model retains the outer skeleton oil seal, and refuels at the lower end of the skeleton oil seal to ensure that the oil will not be lost during transportation. When it is first used, the outer machine seal is always in oil lubrication and will not dry grind; after the skeleton oil seal fails after a period of use, water can enter, and prevent sand and other debris from entering, and the internal part is connected for oil and water exchange. The outer mechanical seal runs in water for a long time, which can well ensure lubrication and cooling, improve the service life of the outer machine seal, and better protect the inner machine seal.

[0023] like Figure 4As shown, the cable pin is directly connected to the coil, the rotor and the upper bearing seat are separately installed, after being directly installed into the rotor, the upper bearing seat is turned over on the upper end of the machine cylinder by using the auxiliary support 10, the cable pin is directly screwed and installed on the upper bearing seat by using the pneumatic / electric gun, and finally the upper bearing seat is turned over and pressed into the machine cylinder. The steps during installation are less, and the production efficiency is improved; and the pin O-shaped ring is axially sealed, and after the pin is installed into the O-shaped ring, the pin is tightly matched with the upper bearing seat, so that the sealing effect is ensured.

[0024] The above-described embodiment is only a preferred scheme of the present application, and does not limit the present application in any form, and 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 barrel, a rotor, a coil, a cable pin, an upper bearing seat and an upper cover. The rotor is located inside the upper bearing seat and is sleeved with a bearing, a retaining ring and a mechanical seal from bottom to top. The upper bearing seat is press-fitted with an upper cover. The rotor is located outside the upper cover and is equipped with a skeleton oil seal. The structure is characterized by: The rotor is located on the outer side of the upper bearing seat and is sleeved with a mechanical seal and a retaining ring in sequence from bottom to top. The mechanical seal on the inner side of the upper bearing seat and the mechanical seal on the outer side of the upper bearing seat are symmetrically distributed.

2. A new type of well submersible motor sealing structure according to claim 1, characterized in that: The bottom of the upper cover is provided with an installation notch corresponding to the mechanical seal installation position on the outer side of the upper bearing seat.

3. A new type of well submersible motor sealing structure according to claim 1, characterized in that: The cable pin is covered with a wiring copper tube, a wiring plug is inserted into the wiring copper tube, and the wiring plug is connected to the coil through wiring.

4. A new type of well submersible motor sealing structure according to claim 1, characterized in that: An upper bushing is attached to the inner side of the barrel.

5. A new type of well submersible motor sealing structure according to claim 1, characterized in that: A pin O-ring is installed between the cable pin and the upper bearing seat, and the cable pin is axially sealed between the pin O-ring and the upper bearing seat.

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