CN221824133U - Mechanical sealing structure of submersible pump - Google Patents

Abstract

A submersible pump mechanical seal structure comprises a pump body and a motor shaft, wherein a motor cavity for installing a motor is provided in the pump body, a motor end cover is fixed at one end of the pump body, an oil cavity is provided in the motor end cover, a pump cover is fixed at the end of the motor end cover away from the motor cavity, a partition plate is fixed in the motor end cover, the partition plate divides the oil cavity into a front oil chamber and a rear oil chamber, two sets of mechanical seal assemblies are arranged on the outer side wall of the motor shaft for sealing, and the two sets of mechanical seal assemblies are separated by a first partition ring, so that the mutual sealing effect is not affected, so that the motor shaft can be guaranteed to have a double sealing effect, and the sealing performance is improved; when one set of mechanical seal assemblies fails, the other set of mechanical seal assemblies can act alone, and the motor shaft can still be kept sealed, so that the sealing reliability of the motor shaft is improved.

Description

Submersible pump mechanical seal structure

Technical Field

The utility model belongs to the technical field of submersible pump sealing structures, in particular to a submersible pump mechanical sealing structure.

Background Art

Submersible pumps are important equipment for deep well water extraction. When in use, the entire unit submerges into the water to extract groundwater to the surface. It is an important equipment for domestic water use, mine rescue, industrial cooling, farmland irrigation, seawater lifting, ship loading and other work.

When the submersible pump is working, the whole unit needs to be submerged in water. The motor and the corresponding electronic control components are installed in the pump body. The motor drives the impeller to rotate and work through the shaft to achieve the function of conveying liquid. The shaft seal is mainly a shaft seal. The shaft seal mainly includes mechanical seal and skeleton oil seal. There are generally two seals on the shaft of the submersible pump. The first seal is located on the side close to the impeller, and its lubrication is directly adopted by the conveying medium. The second seal is in the oil chamber, and its lubrication is adopted by mechanical oil. The first seal is generally a mechanical seal, and the second seal can be a mechanical seal or a skeleton oil seal.

The existing submersible pump mechanical seal structure is shown in the patent with publication number CN214063310U; the arrangement design between the two sets of mechanical seals adopts a back-to-back double-end face seal arrangement; this mechanical seal structure has the advantages of short axial dimension and simple structure; but there are disadvantages such as low sealing pressure, mutual interference between the operating states of the two sealing surfaces, and problems with one sealing surface will also occur with the other sealing surface, resulting in low sealing reliability.

Utility Model Content

In order to overcome the deficiencies of the prior art, the utility model provides a submersible pump mechanical seal structure.

The technical solution adopted by the utility model to solve its technical problems is:

A submersible pump mechanical seal structure comprises a pump body and a motor shaft, wherein a motor cavity for installing a motor is provided in the pump body, a motor end cover is fixed at one end of the pump body, an oil cavity is provided in the motor end cover, a pump cover is fixed at the end of the motor end cover away from the motor cavity, a partition plate is fixed in the motor end cover, the partition plate divides the oil cavity into a front oil chamber and a rear oil chamber, the front oil chamber, the rear oil chamber and the motor cavity are arranged in sequence along the axial direction of the motor shaft; the motor shaft extends out of the motor cavity, passes through the motor end cover, the partition plate and the pump cover in sequence; two groups of mechanical seal assemblies are installed on the outer side wall of the motor shaft corresponding to the part located in the rear oil chamber, a first partition ring is provided between the two groups of mechanical seal assemblies, and the first partition ring is fixed to the outer side wall of the motor shaft; two ends of one group of mechanical seal assemblies respectively abut the motor end cover and the first partition ring, and two ends of the other group of mechanical seal assemblies respectively abut the partition plate and the first partition ring.

In the utility model, a group of mechanical seal assemblies and a second separating ring for limiting the end of the mechanical seal assembly are installed on the outer wall of the motor shaft corresponding to the part located in the front oil chamber, and the two ends of the mechanical seal assembly are respectively abutted against the second separating ring and the pump cover.

In the utility model, the mechanical seal assembly includes a relatively movable movable ring and a stationary ring. The movable ring is relatively fixedly sleeved on the outer side wall of the motor shaft, and the stationary ring is relatively movably sleeved on the outer side wall of the motor shaft. The movable ring has elastic expansion and contraction capability along the axial direction of the motor shaft. One end of the movable ring elastically abuts against the end face of the stationary ring, and the two end faces of the mechanical seal assembly are elastically abutted and sealed by the movable ring.

In the utility model, a mechanical seal assembly is installed in the front oil chamber, and its static ring is fixedly installed and connected to the pump cover, and its dynamic ring and the second separating ring are relatively fixedly sleeved on the outer side wall of the motor shaft, and the two ends of the dynamic ring are respectively abutted against the static ring and the second separating ring, and the dynamic ring and the static ring maintain a tight fit and seal under the action of elastic force.

In the utility model, the mechanical seal assembly has two ends respectively abutting against the motor end cover and the first separating ring, wherein the stationary ring is fixedly installed and connected to the motor end cover, and the two ends of the dynamic ring are elastically abutted against the stationary ring and the first separating ring.

In the utility model, the mechanical seal assembly has two ends respectively abutting against the partition plate and the first partition ring, wherein the stationary ring is fixedly installed and connected to the partition plate, and the two ends of the dynamic ring are elastically abutting against the stationary ring and the first partition ring.

In the utility model, lubricating oil is injected into the front oil chamber and the rear oil chamber. A moisture sensor is also provided in the rear oil chamber. The moisture sensor is inserted into the lubricating oil in the rear oil chamber. The detection end of the moisture sensor is located below the liquid level where the first separating ring is located.

In the utility model, a moisture sensor is provided at the bottom of the motor cavity, and the moisture sensor is located below the motor.

The beneficial effects of the utility model are as follows: by configuring two sets of mechanical sealing components on the outer side wall of the motor shaft for sealing, and the two sets of mechanical sealing components are separated by a first separating ring, the mutual sealing effects are not affected, and it can be ensured that the motor shaft has a double sealing effect, and the sealing performance is improved; when one set of the mechanical sealing components fails, the other set of mechanical sealing components can act alone and still keep the motor shaft sealed, and the sealing reliability of the motor shaft is improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the internal structure of a submersible pump according to the present embodiment;

FIG2 is an enlarged view of portion A in FIG1 ;

FIG3 is a schematic diagram of the overall structure of the mechanical seal assembly of this embodiment;

FIG. 4 is a schematic diagram of the exploded structure of the mechanical seal assembly of this embodiment.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

As shown in Figures 1 to 4, this embodiment discloses a submersible pump mechanical seal structure, including a pump body 1 and a motor shaft 2, wherein the pump body 1 is provided with a motor cavity 11 for installing the motor, a motor end cover 3 is fixed at one end of the pump body 1, an oil cavity is provided in the motor end cover 3, a pump cover 4 is fixed at one end of the motor end cover 3 away from the motor cavity 11, a partition plate 5 is fixed in the motor end cover 3, and the partition plate 5 divides the oil cavity into a front oil cavity 31 and a rear oil cavity 32, and the front oil cavity 31, the rear oil cavity 32 and the motor cavity 11 are connected along the motor shaft 2. The shaft 2 is arranged in sequence in the axial direction; the motor shaft 2 extends from the motor cavity 11, and passes through the motor end cover 3, the partition plate 5 and the pump cover 4 in sequence; two sets of mechanical seal components 6 are installed on the outer wall of the motor shaft 2 corresponding to the part located in the rear oil chamber 32, and a first partition ring 7 is arranged between the two sets of mechanical seal components 6, and the first partition ring 7 is fixed to the outer wall of the motor shaft 2; the two ends of one set of mechanical seal components 6 abut the motor end cover 3 and the first partition ring 7 respectively, and the two ends of the other set of mechanical seal components 6 abut the partition plate 5 and the first partition ring 7 respectively. In this embodiment, two sets of mechanical seal components 6 are arranged on the outer wall of the motor shaft 2 for sealing, and the two sets of mechanical seal components 6 are separated by the first partition ring 7, and the mutual sealing effect is not affected, so that the motor shaft 2 can be guaranteed to have a double sealing effect, and the sealing performance is improved; when one set of mechanical seal components 6 fails, the other set of mechanical seal components 6 can act alone, and the motor shaft 2 can still be kept sealed, and the sealing reliability of the motor shaft 2 is improved.

In this embodiment, in order to further improve the sealing performance of the motor shaft 2, a set of mechanical seal components 6 and a second separation ring 8 for limiting the end of the mechanical seal component 6 are installed on the outer wall of the motor shaft 2 corresponding to the part located in the front oil chamber 31. The two ends of the mechanical seal component 6 are respectively abutted against the second separation ring 8 and the pump cover 4. By configuring another set of mechanical seal components 6 in the front oil chamber 31, a triple sealing structure is formed along the axial direction of the motor shaft 2. The mechanical seal component 6 located in the front oil chamber 31 acts as the first seal to prevent water outside the submersible pump from leaking. The motor shaft 2 enters the submersible pump through the gap on the outer wall thereof; the two sets of mechanical seal assemblies 6 in the rear oil chamber 32 act as the second and third seals. If the first seal fails and water outside the submersible pump enters the front oil chamber 31, the mechanical seal assemblies 6 in the rear oil chamber 32 abutting against the partition plate 5 and the first partition ring 7 prevent the water from entering the rear oil chamber 32; if some water enters the rear oil chamber 32, the mechanical seal assemblies 6 abutting against the motor end cover 3 and the first partition ring 7 prevent the water from entering the motor cavity 11, thereby providing a triple waterproof sealing structure for the motor in the submersible pump.

In this embodiment, the mechanical seal assembly 6 includes a relatively movable and adaptable dynamic ring 61 and a static ring 62. The dynamic ring 61 is relatively fixedly sleeved on the outer wall of the motor shaft 2, and the static ring 62 is relatively movably sleeved on the outer wall of the motor shaft 2. The dynamic ring 61 has elastic expansion and contraction ability along the axial direction of the motor shaft 2. One end of the dynamic ring 61 elastically abuts against the end face of the static ring 62. The two end faces of the mechanical seal assembly 6 are elastically abutted and sealed by the dynamic ring 61. When the mechanical seal assembly 6 is installed, the dynamic ring 61 is first compressed to a certain extent. After the dynamic ring 61 is installed in the specified position, it has a certain elastic force to abut against the end face of the static ring 62, so that the two ends of the dynamic ring 61 are tightly abutted against the two ends of the installation position under the action of the elastic force, thereby achieving the effect of end face sealing.

Specifically, for the mechanical seal assembly 6 installed in the front oil chamber 31, its stationary ring 62 is fixedly installed and connected to the pump cover 4, and its dynamic ring 61 and the second separating ring 8 are relatively fixedly sleeved on the outer wall of the motor shaft 2, and the two ends of the dynamic ring 61 are respectively abutted against the stationary ring 62 and the second separating ring 8. When the motor rotates, the motor shaft 2 and the dynamic ring 61 rotate synchronously, and the second separating ring 8 and the motor shaft 2 also rotate synchronously, the static ring 62 and the pump cover 4 are stationary, and the dynamic ring 61 and the static ring 62 maintain a tight fit and seal under the action of elastic force.

Specifically, for the two sets of mechanical seal assemblies 6 installed in the rear oil chamber 32, the two ends of the mechanical seal assemblies 6 respectively abut the motor end cover 3 and the first separation ring 7, the stationary ring 62 is fixedly installed and connected to the motor end cover 3, and the two ends of the dynamic ring 61 are elastically abutted against the stationary ring 62 and the first separation ring 7. For the mechanical seal assemblies 6 whose two ends respectively abut the separation plate 5 and the first separation ring 7, the stationary ring 62 is fixedly installed and connected to the separation plate 5, and the two ends of the dynamic ring 61 are elastically abutted against the stationary ring 62 and the first separation ring 7. That is, when the motor rotates, the motor shaft 2 drives the first separation ring 7 and the dynamic rings 61 located at the two ends of the first separation ring 7 to rotate synchronously, while the stationary ring 62 is stationary.

In this embodiment, lubricating oil is injected into the front oil chamber 31 and the rear oil chamber 32. A moisture sensor 9 is also provided in the rear oil chamber 32. The moisture sensor 9 is inserted into the lubricating oil in the rear oil chamber 32. The detection end of the moisture sensor 9 is located below the liquid level where the first separating ring 7 is located, so that water enters the rear oil chamber 32. When the water surface reaches the liquid level where the detection end of the moisture sensor 9 is located, the moisture sensor 9 detects the water level signal and sends an early warning message to remind the staff that the submersible pump needs to be repaired. When water enters the rear oil chamber 32, since the density of the lubricating oil is less than the density of water, the water in the rear oil chamber 32 will be below the lubricating oil. The water entering the rear oil chamber 32 will spread upward from the inside of the rear oil chamber 32. When the moisture sensor 9 detects moisture, it means that a certain amount of water has accumulated in the rear oil chamber 32, and at least one set of the mechanical seal components 6 in the rear oil chamber 32 has failed. If it is not controlled or the submersible pump is not repaired, when both sets of mechanical seal components 6 in the rear oil chamber 32 fail, water will enter the motor cavity 11 from the rear oil chamber 32, causing damage to the motor.

In this embodiment, a moisture sensor 9 is provided at the bottom of the motor cavity 11. The moisture sensor 9 is located below the motor. When the moisture sensor 9 detects moisture, it immediately sends an electrical signal to the outside to cut off all circuits of the submersible pump and cut off the power to the submersible pump, thereby improving the safety of the use of the submersible pump.

The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the protection scope of the present invention.

Claims (8)

1. Immersible pump mechanical seal structure, its characterized in that: the motor comprises a pump body (1) and a motor rotating shaft (2), wherein a motor cavity (11) for installing a motor is arranged in the pump body (1), a motor end cover (3) is fixed at one end of the pump body (1), an oil cavity is arranged in the motor end cover (3), a pump cover (4) is fixed at one end, far away from the motor cavity (11), of the motor end cover (3), a partition plate (5) is fixed in the motor end cover (3), the partition plate (5) divides the oil cavity into a front oil cavity (31) and a rear oil cavity (32), and the front oil cavity (31), the rear oil cavity (32) and the motor cavity (11) are sequentially arranged along the axial direction of the motor rotating shaft (2); the motor rotating shaft (2) extends out of the motor cavity (11) and sequentially penetrates through the motor end cover (3), the partition plate (5) and the pump cover (4); two groups of mechanical seal assemblies (6) are arranged on the outer side wall of the part, corresponding to the rear oil chamber (32), of the motor rotating shaft (2), a first separation ring (7) is arranged between the two groups of mechanical seal assemblies (6), and the first separation ring (7) is fixed on the outer side wall of the motor rotating shaft (2); two ends of one group of mechanical sealing components (6) are respectively abutted against the motor end cover (3) and the first separation ring (7), and two ends of the other group of mechanical sealing components (6) are respectively abutted against the separation plate (5) and the first separation ring (7).

2. The submersible pump mechanical seal of claim 1, wherein: a group of mechanical seal assemblies (6) and second partition rings (8) used for limiting the ends of the mechanical seal assemblies (6) are arranged on the outer side wall of the part, corresponding to the front oil chamber (31), of the motor rotating shaft (2), and two ends of the mechanical seal assemblies (6) are respectively abutted to the second partition rings (8) and the pump cover (4).

3. The submersible pump mechanical seal structure of claim 1 or 2, wherein: the mechanical seal assembly (6) comprises a movable ring (61) and a static ring (62) which are relatively movably matched, the movable ring (61) is relatively fixedly sleeved on the outer side wall of the motor rotating shaft (2), the static ring (62) is relatively movably sleeved on the outer side wall of the motor rotating shaft (2), the movable ring (61) has elastic expansion capacity along the axial direction of the motor rotating shaft (2), one end of the movable ring (61) is elastically abutted to the end face of the static ring (62), and two end faces of the mechanical seal assembly (6) are elastically abutted and sealed through the movable ring (61).

4. A submersible pump mechanical seal according to claim 3, wherein: the mechanical seal assembly (6) is arranged in the front oil chamber (31), a static ring (62) of the mechanical seal assembly is fixedly arranged and connected to the pump cover (4), a movable ring (61) and a second partition ring (8) of the mechanical seal assembly are fixedly sleeved on the outer side wall of the motor rotating shaft (2) relatively, two ends of the movable ring (61) are respectively abutted to the static ring (62) and the second partition ring (8), and the movable ring (61) and the static ring (62) are kept tightly attached and sealed under the action of elasticity.

5. A submersible pump mechanical seal according to claim 3, wherein: and two ends of the mechanical seal assembly (6) are respectively abutted against the motor end cover (3) and the first separation ring (7), the static ring (62) of the mechanical seal assembly is fixedly installed and connected to the motor end cover (3), and two ends of the movable ring (61) are elastically abutted against the static ring (62) and the first separation ring (7).

6. A submersible pump mechanical seal according to claim 3, wherein: and the two ends of the mechanical seal assembly (6) are respectively abutted against the partition plate (5) and the first separation ring (7), the static ring (62) of the mechanical seal assembly is fixedly connected with the partition plate (5), and the two ends of the movable ring (61) are elastically abutted against the static ring (62) and the first separation ring (7).

7. The submersible pump mechanical seal of claim 1, wherein: lubricating oil is injected into the front oil chamber (31) and the rear oil chamber (32), a water sensor (9) is further arranged in the rear oil chamber (32), the water sensor (9) is inserted into the lubricating oil in the rear oil chamber (32), and the detection end of the water sensor (9) is positioned below the liquid level where the first separation ring (7) is positioned.

8. The submersible pump mechanical seal of claim 1, wherein: the bottom of the motor cavity (11) is provided with a moisture sensor (9), and the moisture sensor (9) is positioned below the motor.