CN214788052U - Submersible pump - Google Patents

Abstract

The utility model relates to a submersible pump, including pump cover, shell body, play water conservation, inlet base and pump water unit. The water inlet base and the outer shell are mutually butted to form a containing cavity. The pump cover is arranged in the accommodating cavity. The water outlet joint is fixed on the pump cover and passes through the top wall of the outer shell. The water pumping unit is also arranged in the accommodating cavity and comprises a motor and a multi-stage impeller assembly. The motor comprises a stator, a rotor, a motor protective shell and a first sealing part. The multistage impeller assembly includes a negative pressure generator, an impeller, a rotary shaft, and a second seal portion. The impellers are all fixed on the rotating shaft. The rotating shaft is directly driven by the motor and sequentially passes through the bottom wall of the motor protective shell and the top wall of the negative pressure generating body. First sealing portion inlays and locates on the diapire of motor protecting crust, and seals the assembly clearance between rotating shaft and the motor protecting crust. The second sealing part is embedded on the top wall of the negative pressure generating body and seals the assembly gap between the rotating shaft and the negative pressure generating body.

Description

Submersible pump

Technical Field

The utility model relates to a technical field is made to the water pump, especially relates to a immersible pump.

Background

The submersible pump is an important device for pumping water from a deep well, when in use, the whole unit is submerged into water to work, and the underground water is pumped to the ground surface, so that the submersible pump is used for domestic water, mine emergency rescue, industrial cooling, farmland irrigation, seawater lifting and ship load regulation, and can also be used for fountain landscape.

In the prior art, a pumping unit of a submersible pump is composed of a motor and a multistage impeller assembly. Wherein, multistage impeller subassembly is including negative pressure generator, impeller and rotation axis. The impellers are all arranged in the negative pressure generating body and are sequentially fixed on the rotating shaft. The rotating shaft is directly driven by a motor. However, in the actual operation process of the submersible pump, the negative pressure generating body is completely filled with the water drawing water, and the drawn water is always kept in an ultrahigh pressure state under the continuous rotation effect of the impeller, so that the water is easy to flow out of the negative pressure generating body through the assembly gap between the rotating shaft and the negative pressure generating body, further the outer surface of the motor is corroded, and in severe cases, the water even enters the motor to cause the problem of 'burn-in'. Thus, a skilled person is urgently needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

Therefore, in view of the above-mentioned problems and drawbacks, the present invention provides a submersible pump that is capable of collecting relevant information, evaluating and considering in many ways, and continuously performing experiments and modifications by a plurality of years of research and development experience technicians engaged in the industry.

In order to solve the technical problem, the utility model relates to a submersible pump, including pump cover, shell body, play water festival, the base of intaking and pumping unit. Wherein, the base of intaking and shell body dock each other to form and hold the cavity. The pump cover is arranged in the accommodating cavity. The water outlet joint is arranged and fixed on the pump cover and passes through the top wall of the outer shell. The water pumping unit is also arranged in the accommodating cavity. The water pumping unit comprises a motor and a multi-stage impeller assembly, and when the water pumping unit is started, water is lifted to the water outlet section through the water inlet base by means of a pressure difference effect. The motor comprises a stator, a rotor, a motor protective shell and a first sealing part. The stator and the rotor are concentrically sleeved and are both arranged in the motor protective shell. The multistage impeller assembly includes a negative pressure generator, an impeller, a rotary shaft, and a second seal portion. The impeller is provided with a plurality of impellers, is arranged in the negative pressure generator, and is sequentially fixed on the rotating shaft along the vertical direction. The rotating shaft is directly driven by the motor and sequentially passes through the bottom wall of the motor protective shell and the top wall of the negative pressure generating body until the rotating shaft extends into the inner cavity of the negative pressure generating body. First sealing portion inlays and locates on the diapire of motor protecting crust, and seals the assembly clearance between rotating shaft and the motor protecting crust. The second sealing part is embedded on the top wall of the negative pressure generating body and seals the assembly gap between the rotating shaft and the negative pressure generating body.

As the technical scheme of the utility model is further improved, the motor is still including supplementary installation shell and third sealing. The auxiliary mounting shell is nested in the inner cavity of the motor protective shell and is positioned right below the rotor and the stator. The third sealing portion is supported by the auxiliary mounting case, is embedded in the bottom wall of the auxiliary mounting case, and seals an assembly gap between the rotary shaft and the auxiliary mounting case.

As the utility model discloses technical scheme's further improvement, supplementary installation shell is pushed up and is touched portion and side direction top and touch the portion and connect according to the preface and form by inlaying concave part portion, transitional coupling portion, lower extreme. The embedding groove part is used for embedding and fixing the third sealing part. When the auxiliary mounting shell is arranged in place relative to the motor protecting shell, the lower end top contact part and the lateral top contact part are in one-to-one correspondence with the upper plane of the bottom wall of the motor protecting shell and the circumferential inner side wall of the motor protecting shell.

As a further improvement of the technical proposal of the utility model, the motor also comprises a pressing sleeve. The pressing sleeve is arranged in the inner cavity of the motor protective shell and screwed on the rotating shaft by means of the thread pair. When the pressing sleeve is rotated in the circumferential direction, the pressing sleeve moves in a displacement manner in the opposite direction or in the back of the embedded groove portion, so that the pressing/loosening operation of the auxiliary mounting shell relative to the motor protection shell is realized.

As a further improvement of the technical proposal of the utility model, the motor also comprises a sealing ring. When the auxiliary mounting shell is built in place relative to the motor protective shell, the sealing ring is elastically pressed between the auxiliary mounting shell and the motor protective shell.

As another modified design of the technical scheme, the auxiliary mounting shell and the motor protection shell can be fixed by laser welding.

As a further improvement of the technical solution of the present invention, the first sealing portion is preferably sealed by a mechanical sealing method; the second sealing part and the third sealing part are preferably sealed in a framework oil seal mode.

Compare in the immersible pump of traditional project organization the utility model discloses an among the technical scheme, be provided with first sealing and second sealing in its pump water unit simultaneously. In the actual operation process of the submersible pump, firstly, a first sealing protection line is formed at the installation position of the second sealing part, so that high-pressure water can be effectively prevented from overflowing through an assembly gap between the negative pressure generating body and the rotating shaft, and the motor is prevented from being corroded by water; even under some severe circumstances, if there is a very small amount of water to spill over by the negative pressure emergence body, at this moment, first sealing forms the sealed guard wire of second way, prevents that water from getting into the inside of motor via the fit-up gap between rotation axis and the motor protecting crust, and then has avoided the emergence of the short circuit burning phenomenon to appear in the motor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view of the submersible pump of the present invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a schematic perspective view of the submersible pump of the present invention (with part of the outer housing hidden).

Fig. 4 is a sectional view a-a of fig. 2.

Fig. 5 is a half-section schematic diagram of the water pumping unit in the submersible pump of the present invention.

Fig. 6 is a schematic perspective view of the auxiliary mounting shell in the submersible pump of the present invention.

Fig. 7 is a front view of fig. 6.

Fig. 8 is a sectional view B-B of fig. 7.

Fig. 9 is a schematic perspective view of the first sealing portion of the submersible pump of the present invention.

Fig. 10 is a schematic perspective view of the second sealing portion of the submersible pump of the present invention.

Fig. 11 is a schematic perspective view of a third sealing portion in the submersible pump of the present invention.

1-pump cover; 2-an outer shell; 3-water outlet section; 4-a water inlet base; 5-a water pumping unit; 51-a motor; 511-a stator; 512-a rotor; 513-a motor shield shell; 514-first seal; 515-an auxiliary mounting shell; 5151-embedding groove part; 5152-transition joint; 5153-lower end top contact part; 5154-lateral top contact; 516-a third seal; 517-pressing sleeve; 518-a seal ring; 52-a multistage impeller assembly; 521-negative pressure generator; 522-an impeller; 523-rotation axis; 524-second seal.

Detailed Description

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The technical solution disclosed in the present invention is further described in detail below with reference to specific embodiments, as shown in fig. 1, 2, and 3, the submersible pump mainly comprises a pump cover 1, an outer shell 2, a water outlet section 3, a water inlet base 4, and a water pumping unit 5. Wherein the water inlet base 4 and the outer shell 2 are butted against each other to form a receiving cavity. The pump cover 1 is arranged in the accommodating cavity. The water outlet joint 3 is installed and fixed on the pump cover 1 and passes through the top wall of the outer shell 2. The pumping unit 5 is also built into the receiving cavity and when it is activated lifts water via the inlet base 4 into the outlet section 3 by means of a pressure difference effect.

As can be seen from fig. 4 and 5, the water pumping unit 5 is mainly composed of a motor 51 and a multistage impeller assembly 52. The motor 51 includes a stator 511, a rotor 512, a motor protective case 513, and a first sealing part 514. The stator 511 and the rotor 512 are concentrically sleeved and both are arranged in the motor protective shell 513. The multistage impeller assembly 52 includes a negative pressure generator 521, an impeller 522, a rotary shaft 523, and a second seal portion 524. The impellers 522 are provided in plural numbers, are each built in the negative pressure generator 521, and are sequentially fixed to the rotary shaft 523 in the vertical direction. The rotating shaft 523 is directly driven by the motor 51, and sequentially passes through the bottom wall of the motor protection housing 513 and the top wall of the negative pressure generator 521 until extending into the inner cavity of the negative pressure generator 521. The first sealing portion 514 is embedded in the bottom wall of the motor shield case 513 and seals a fitting gap between the rotating shaft 523 and the motor shield case 513. The second sealing portion 524 is fitted to a top wall of the negative pressure generator 521, and seals a fitting gap between the rotation shaft 523 and the negative pressure generator 521. In the actual operation process of the submersible pump, firstly, a first sealing protection line is formed at the installation position of the second sealing part 524, so that high-pressure water can be effectively prevented from overflowing through an assembly gap between the negative pressure generating body 521 and the rotating shaft 523, and the motor is prevented from being corroded by water; even under some severe conditions, if a very small amount of water overflows from the negative pressure generator 521, the first sealing part 514 forms a second sealing protection line to prevent water from entering the interior of the motor 51 through the assembly gap between the rotating shaft 523 and the motor protection housing 513, thereby preventing the motor 51 from short-circuit burning.

Two points need to be explained here:

1) as is known, a mechanical seal is a device for preventing fluid leakage, which is formed by at least one pair of end faces perpendicular to a rotation axis, and the end faces are kept in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism and the cooperation of an auxiliary seal, and has good high-pressure resistance, a sealed state can keep good stability for a long time, the leakage amount is small, and the leakage amount is generally only 1/100 of a soft packing seal according to rough statistics. In view of this, the second sealing portion 524, which is relatively high in water pressure, is preferably sealed in a mechanical sealing manner (as shown in fig. 10);

2) the function of the framework oil seal is generally to isolate the parts to be lubricated in the transmission parts from the external environment, so that the lubricating oil cannot leak. The framework acts as a reinforcement for the steel bars inside the concrete member and allows the oil seal to maintain shape and tension. According to the structural form, the single-lip framework oil seal and the double-lip framework oil seal can be separated. The auxiliary lip of the double-lip framework oil seal plays a dustproof role, and prevents external dust, impurities and the like from entering the machine. However, the pressure-bearing range of the skeleton oil seal is quite limited, and is generally less than 0.03 MPa. In view of the above-described characteristics of the skeleton oil seal, the first seal portion 514 is preferably sealed in a double-lip skeleton oil seal manner (as shown in fig. 9).

As a further optimization of the above submersible pump structure, in order to further reduce the possibility of water intrusion into the motor 51, as shown in fig. 4 and 5, an auxiliary mounting shell 515 and a third sealing portion 516 are further added to the inner cavity of the motor 51. The auxiliary mounting housing 515 is nested and fixed in the inner cavity of the motor protective housing 513 and is positioned directly below the rotor 512 and the stator 511. The third seal portion 516 is supported by the auxiliary attachment case 515, is fitted to the bottom wall of the auxiliary attachment case 515, and seals the fitting gap between the rotary shaft 523 and the auxiliary attachment case 515. In this way, even if some water flows into the motor 51, the auxiliary mounting shell 515 and the third sealing portion 516 cooperate to form a third sealing protection line, thereby further reducing the occurrence of "short circuit burning" of the stator coil due to the water flow.

Here, it should be noted that, in the actual operation process of the submersible pump, even if some water flows through the first sealing portion 514 and enters the cavity enclosed by the auxiliary mounting shell 515 and the motor protection shell 513, the pressure is extremely small, and in view of the above factors, the third sealing portion 516 for sealing the assembly gap between the rotating shaft 523 and the auxiliary mounting shell 515 does not have the requirement of dust prevention, and therefore, the sealing may be performed in the single-lip framework oil sealing direction (as shown in fig. 11).

In the experimental stage of manufacturing the submersible pump in small batches, the specific design structure of the auxiliary mounting shell 515 and the matching manner of the auxiliary mounting shell 515 and the motor protection shell 513 have a crucial influence on the position stability and the sealing efficiency of the third sealing portion 516, and in view of this, a preferred design structure of the auxiliary mounting shell 515 is provided in this embodiment, as shown in fig. 6, 7 and 8, and is formed by sequentially connecting an embedded groove portion 5151, a transition connecting portion 5152, a lower end abutting portion 5153 and a lateral abutting portion 5154. The inlay groove portion 5151 is used to embed and fix the third sealing portion 516. When the auxiliary mounting case 515 is in place with respect to the motor protection case 513, the lower top contact portion 5153 and the lateral top contact portion 5154 are in one-to-one contact with the upper plane of the bottom wall of the motor protection case 513 and the circumferential inner side wall of the motor protection case 513.

In addition, as can also be seen from fig. 4 and 5, a pressing sleeve 517 is additionally added inside the motor 51. The pressing sleeve 517 is disposed in the inner cavity of the motor protecting case 513 and is screwed on the rotating shaft 523 by means of a screw pair. When the pressing sleeve 517 is circumferentially rotated, it is displaced toward/away from the insertion groove portion 5151 to perform a pressing/releasing operation of the auxiliary mounting case 515 with respect to the motor protection case 513.

Of course, as another modified design of the above technical solution, the auxiliary mounting shell 515 and the motor protection shell 513 may also be fixed by laser welding (not shown in the drawings). The specific operation flow is approximately as follows: after the auxiliary mounting case 515 is built in place with respect to the motor protection case 513, a plurality of welding points are formed around the outer side wall of the motor protection case 513 by laser welding to achieve reliable limitation of the mounting position of the auxiliary mounting case 515.

Finally, it should be noted that, in the experimental stage of manufacturing the submersible pump in small batch, it is found that the water flow may invade through the assembly gap between the auxiliary mounting shell 515 and the motor protection shell 513 in addition to the assembly gap between the rotating shaft 523 and the auxiliary mounting shell 515 to corrode or short-circuit the stator and the rotor, and in view of this, as a further optimization of the above submersible pump structure, as shown in fig. 4 and 5, a sealing ring 518 is additionally added to the motor 51. When the auxiliary mounting case 515 is built-in place with respect to the motor protection case 513, the sealing ring 518 is elastically pressed between the auxiliary mounting case 515 and the motor protection case 513.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. A submersible pump comprises a pump cover, an outer shell, a water outlet joint, a water inlet base and a water pumping unit; the water inlet base and the outer shell are mutually butted to form a containing cavity; the pump cover is arranged in the accommodating cavity; the water outlet joint is arranged and fixed on the pump cover and penetrates through the top wall of the outer shell; the water pumping unit is also arranged in the accommodating cavity; the water pumping unit comprises a motor and a multi-stage impeller assembly, and when the water pumping unit is started, water is lifted to the water outlet joint through the water inlet base by means of a pressure difference effect; the motor is characterized by comprising a stator, a rotor, a motor protective shell and a first sealing part; the stator and the rotor are concentrically sleeved and are both arranged in the motor protective shell; the multistage impeller assembly comprises a negative pressure generating body, an impeller, a rotating shaft and a second sealing part; the negative pressure generator is characterized in that the number of the impellers is multiple, the impellers are all arranged in the negative pressure generator, and are sequentially fixed on the rotating shaft along the vertical direction; the rotating shaft is directly driven by the motor and sequentially penetrates through the bottom wall of the motor protective shell and the top wall of the negative pressure generator until the rotating shaft extends into the inner cavity of the negative pressure generator; the first sealing part is embedded in the bottom wall of the motor protecting shell and seals an assembly gap between the rotating shaft and the motor protecting shell; the second sealing portion is embedded in the top wall of the negative pressure generating body and seals an assembly gap between the rotating shaft and the negative pressure generating body.

2. The submersible pump of claim 1, wherein the motor further comprises an auxiliary mounting shell and a third seal portion; the auxiliary mounting shell is nested in an inner cavity of the motor protective shell and is positioned right below the rotor and the stator; the third sealing portion is supported by the auxiliary mounting case, is embedded in the bottom wall of the auxiliary mounting case, and seals an assembly gap between the rotating shaft and the auxiliary mounting case.

3. The submersible pump of claim 2, wherein the auxiliary mounting shell is formed by sequentially connecting an embedded groove portion, a transition connecting portion, a lower end abutting portion and a lateral abutting portion; the embedding groove part is used for embedding and fixing the third sealing part; when the auxiliary mounting shell is arranged in place relative to the motor protecting shell, the lower end top contact part and the lateral top contact part are in one-to-one corresponding top contact with the upper plane of the bottom wall of the motor protecting shell and the circumferential inner side wall of the motor protecting shell.

4. The submersible pump of claim 3, wherein the motor further comprises a compression sleeve; the pressing sleeve is arranged in the inner cavity of the motor protective shell and screwed on the rotating shaft by means of a thread pair; when the pressing sleeve is circumferentially rotated, the pressing sleeve moves oppositely/reversely to the embedding groove portion, so that the auxiliary mounting shell is pressed/loosened relative to the motor protection shell.

5. The submersible pump of claim 4, wherein the motor further comprises a sealing ring; when the auxiliary mounting shell is built in place relative to the motor protective shell, the sealing ring is elastically pressed between the auxiliary mounting shell and the motor protective shell.

6. The submersible pump of claim 2, wherein the auxiliary mounting shell and the motor shield shell are secured by laser welding.

7. The submersible pump of any of claims 2-6, wherein the first seal is sealed in a mechanical seal; and the second sealing part and the third sealing part are sealed in a framework oil seal mode.

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