Dry shaft type submerged pump

Abstract

The utility model discloses a dry shaft type submerged pump which comprises a pump body, an impeller is installed in a cavity in the pump body, a protective sleeve is connected to the periphery of the top end of the impeller, the top end of the protective sleeve extends into a cavity of an installation plate, a main force pipe is installed at the position, located on the outer side of the protective sleeve, of the bottom end of the installation plate, and a motor is installed at the top end of the installation plate. A power output shaft of the motor penetrates through the protective sleeve to be connected with the impeller, a wear-resisting ring is installed on the portion, matched with the protective sleeve, in the installation plate, and a wear-resisting ring gland is installed on the outer side of the wear-resisting ring. The utility model has the beneficial effects that the sheath and the impeller are designed into an integrated structure, and the transmission shaft of the motor is completely included in the sheath on the impeller, so that the transmission shaft of the motor is completely isolated from a conveying medium, and the problem of sealing failure at the transmission shaft of the motor is completely solved; meanwhile, the dry sealing ring can prevent the conveyed medium from volatilizing to the outside, and the pressure relief groove is formed in the pump body, so that the volume loss of the pump can be reduced, and the efficiency of the pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of submersible pumps, in particular to a dry-shaft submersible pump. Background Art

[0002] The submersible pump is a positive pressure conveying vertical pump that can effectively solve the problems of gas blockage and cavitation. The explosion-proof level of the conveyed material determines that the submersible pump products have different structures, working principles, classifications, applicable scopes, product advantages and disadvantages, and operating methods. They can be simply divided into two categories: traditional submersible pumps (explosion-proof in zone 1 outside the tank and non-explosion-proof in zone 0 inside the tank) and new submersible pumps (explosion-proof in zone 1 outside the tank and explosion-proof in zone 0 inside the tank).

[0003] At present, for submersible pump units, when the distance between the impeller and the motor is relatively close, the pump and the motor are coaxial, the impeller transmits torque through the key on the shaft, an impeller nut is provided at the impeller end for axial fixation, and a rubber seal is provided between the impeller nut and the impeller end face for sealing; on the one hand, the pump conveying medium is mostly a special corrosive medium, and the rubber has a short life in such an environment, and there is a risk of seal failure; on the other hand, when the pump is stopped, the pump backflows under the action of water hammer in the device system, and the impeller nut is loose, resulting in the seal not being tightened and losing the sealing effect, which eventually causes the shaft to contact the corrosive medium; once the shaft is corroded and damaged, the maintenance cost is very high and cannot be completed at the user's site, resulting in a short pump service life and excessively high maintenance costs. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the utility model is to provide a dry-shaft submersible pump which can completely wrap the shaft through the impeller without any seal and completely solve the problem of seal failure in view of the current status of the prior art.

[0006] (II) Technical solution

[0007] The utility model is achieved through the following technical scheme: the utility model proposes a dry-shaft submersible pump, including a pump body, an impeller is installed in a cavity in the pump body, a sheath is connected to the outer periphery of the top end of the impeller, the top end of the sheath extends into the cavity of a mounting plate, the bottom end of the mounting plate is located outside the sheath and a main pipe is installed, a motor is installed on the top of the mounting plate, the power output shaft of the motor passes through the sheath and is connected to the impeller, a wear-resistant ring is installed in the mounting plate and in a matching position with the sheath, a wear-resistant ring pressure cover is installed on the outside of the wear-resistant ring, a dry sealing ring is installed in a matching position between the sheath and the main pipe, and the pump body is provided with a labyrinth groove at the part through which the impeller passes, and the labyrinth groove and the impeller hub form a pressure relief area.

[0008] Furthermore, a pump cover is installed at the bottom end of the pump body, and a filter is installed at the bottom end of the pump cover.

[0009] By adopting the above technical solution, the filter is mainly used to filter the medium pumped into the pump body to prevent impurities from clogging the pump body.

[0010] Furthermore, a curved pipe is installed at the liquid outlet of the pump body, and a water outlet section is installed at the top of the curved pipe.

[0011] By adopting the above technical solution, the bent pipe can transport the pumped medium.

[0012] Furthermore, the impeller is in the cavity of the pump body, and the impeller is key-connected to the power output shaft of the motor.

[0013] By adopting the above technical solution, the impeller can be easily rotated under the action of the motor, so that the medium can be sucked and transported after the impeller rotates.

[0014] Furthermore, the wear-resistant ring is plugged into the mounting plate, and the wear-resistant ring gland is bolted to the mounting plate.

[0015] By adopting the above technical solution, the wear-resistant ring can ensure the sealing performance between the sliding sleeve and the mounting plate.

[0016] Furthermore, the motor is connected to the mounting plate by bolts, the sheath passes through the mounting plate, and a gap is reserved between the outer wall of the sheath and the mounting plate.

[0017] By adopting the above technical solution, convenient rotation of the sleeve relative to the mounting plate can be ensured.

[0018] Furthermore, the pump cover is connected to the pump body by bolts, and the filter is connected to the pump body by bolts.

[0019] By adopting the above technical solution, the filter screen can be reliably installed on the cover plate.

[0020] Furthermore, the bent pipe is connected to the liquid outlet of the pump body and the water outlet section.

[0021] By adopting the above technical solution, the water outlet section can ensure that the medium transported by the elbow can be conveniently transported to the external pipeline.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] In order to solve the current problem of submersible pump units, when the distance between the impeller and the motor is close, the pump and the motor are coaxial, the impeller transmits torque through the key on the shaft, an impeller nut is provided at the impeller end for axial fixation, and a rubber seal is provided between the impeller nut and the impeller end face for sealing; on the one hand, the pump conveying medium is mostly a special corrosive medium, and the rubber has a short life in such an environment, and there is a risk of seal failure; on the other hand, when the pump is stopped, the pump backflows under the action of water hammer in the device system, the impeller nut is loose, and the seal is not compressed and loses the sealing effect, which eventually leads to corrosion of the shaft and Medium contact; once the shaft is corroded and damaged, the maintenance cost is very high and cannot be completed on site, resulting in a short pump life and high maintenance cost. The utility model designs the sleeve and the impeller into an integrated structure, and completely includes the drive shaft of the motor in the sleeve on the impeller, so that the drive shaft of the motor is completely isolated from the conveying medium, completely solving the problem of seal failure at the drive shaft of the motor, and at the same time, with the help of a dry sealing ring, the conveying medium can be prevented from volatilizing to the outside, and a pressure relief groove is provided on the pump body, which can reduce the volume loss of the pump and improve the efficiency of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a main sectional view of a dry-shaft submersible pump described in the utility model;

[0026] Figure 2 This is a dry shaft submersible pump described in the utility model. Figure 1 Enlarged view of point A in the middle.

[0027] The following are the descriptions of the reference numerals:

[0028] 1. Filter; 2. Pump cover; 3. Pump body; 4. Impeller; 5. Main pipe; 6. Dry seal ring; 7. Wear-resistant ring; 8. Wear-resistant ring gland; 9. Mounting plate; 10. Motor; 11. Water outlet section; 12. Elbow; 13. Jacket. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] like Figure 1-Figure 2As shown, a dry-shaft submersible pump in this embodiment includes a pump body 3, an impeller 4 is installed in the cavity in the pump body 3, a sheath 13 is connected to the outer periphery of the top of the impeller 4, the top of the sheath 13 extends into the cavity of the mounting plate 9, the bottom of the mounting plate 9 is located outside the sheath 13 and a main pipe 5 is installed, and a motor 10 is installed on the top of the mounting plate 9. Under the action of the motor 10, the impeller 4 can be easily rotated, so that the medium can be sucked and transported after the impeller 4 rotates. The power output shaft of the motor 10 runs through The sleeve 13 is connected to the impeller 4, a wear-resistant ring 7 is installed at the matching position of the sleeve 13 in the mounting plate 9, a wear-resistant ring pressure cover 8 is installed on the outside of the wear-resistant ring 7, a dry seal 6 is installed at the matching position of the sleeve 13 and the main pipe 5, and a labyrinth groove is provided in the part of the pump body 3 through which the impeller 4 passes, and the labyrinth groove and the hub of the impeller 4 form a pressure relief area, the sleeve 13 passes through the mounting plate 9, and a gap is reserved between the outer wall of the sleeve 13 and the mounting plate 9, which can ensure the convenient rotation of the sleeve 13 relative to the mounting plate 9.

[0031] like Figure 1-Figure 2 As shown, in this embodiment, a pump cover 2 is installed at the bottom end of the pump body 3, and a filter screen 1 is installed at the bottom end of the pump cover 2. The filter screen 1 is mainly used to filter the medium drawn into the pump body 3 to prevent impurities from clogging the pump body 3. A curved pipe 12 is installed at the liquid outlet of the pump body 3, and a water outlet section 11 is installed at the top of the curved pipe 12. The curved pipe 12 can transport the pumped medium.

[0032] like Figure 1-Figure 2 As shown, in this embodiment, the impeller 4 is in the cavity of the pump body 3, the impeller 4 is keyed to the power output shaft of the motor 10, the wear-resistant ring 7 is plugged into the mounting plate 9, the wear-resistant ring pressure cover 8 is bolted to the mounting plate 9, the wear-resistant ring 7 can ensure the sealing performance between the sliding sleeve and the mounting plate 9, and the motor 10 is bolted to the mounting plate 9.

[0033] like Figure 1-Figure 2 As shown, in this embodiment, the pump cover 2 is bolted to the pump body 3, and the filter screen 1 is bolted to the pump body 3, so that the filter screen 1 can be reliably installed on the cover plate, and the elbow 12 is connected to the liquid outlet of the pump body 3 and the water outlet section 11. With the help of the water outlet section 11, it can be ensured that the medium transported by the elbow 12 can be conveniently transported to the external pipeline.

[0034] The specific implementation process of this embodiment is as follows: when in use, first install the submersible pump at the use position, and connect the water outlet section 11 to the external cut-off conveying pipeline, and then just start the motor 10, and the medium can be sucked and conveyed while the motor 10 drives the impeller 4 to rotate. In the process of conveying the medium, the sheath 13 and the impeller 4 are designed as an integrated structure, and the transmission shaft of the motor 10 is completely included in the sheath 13 on the impeller 4, so that the transmission shaft of the motor 10 is completely isolated from the conveying medium, and the problem of sealing failure at the transmission shaft of the motor 10 is completely solved. At the same time, the dry sealing ring 6 can prevent the conveying medium from volatilizing to the outside, and a pressure relief groove is provided on the pump body 3, which can reduce the volume loss of the pump and improve the efficiency of the pump.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dry shaft submersible pump, characterized in that: The invention comprises a pump body (3), wherein an impeller (4) is installed in a cavity in the pump body (3), a sleeve (13) is connected to the outer periphery of the top end of the impeller (4), the top end of the sleeve (13) extends into the cavity of the mounting plate (9), a main pipe (5) is installed at the bottom end of the mounting plate (9) and located outside the sleeve (13), a motor (10) is installed at the top end of the mounting plate (9), a power output shaft of the motor (10) passes through the sleeve (13) and is connected to the impeller (4), a wear-resistant ring (7) is installed in the mounting plate (9) at a position matching with the sleeve (13), a wear-resistant ring pressure cover (8) is installed outside the wear-resistant ring (7), a dry seal ring (6) is installed at a position matching with the sleeve (13) and the main pipe (5), and a labyrinth groove is provided in the pump body (3) at a portion through which the impeller (4) passes, and the labyrinth groove and the impeller (4) hub form a pressure relief area.

2. A dry-shaft submersible pump according to claim 1, characterized in that: A pump cover (2) is installed at the bottom end of the pump body (3), and a filter screen (1) is installed at the bottom end of the pump cover (2).

3. A dry-shaft submersible pump according to claim 2, characterized in that: A curved pipe (12) is installed at the liquid outlet of the pump body (3), and a water outlet section (11) is installed at the top end of the curved pipe (12).

4. A dry-shaft submersible pump according to claim 1, characterized in that: The impeller (4) is in the cavity of the pump body (3), and the impeller (4) is key-connected to the power output shaft of the motor (10).

5. A dry-shaft submersible pump according to claim 1, characterized in that: The wear-resistant ring (7) is plugged into the mounting plate (9), and the wear-resistant ring gland (8) is bolted to the mounting plate (9).

6. A dry-shaft submersible pump according to claim 1, characterized in that: The motor (10) is bolted to the mounting plate (9), the sheath (13) passes through the mounting plate (9), and a gap is reserved between the outer wall of the sheath (13) and the mounting plate (9).

7. A dry-shaft submersible pump according to claim 2, characterized in that: The pump cover (2) is connected to the pump body (3) by bolts, and the filter screen (1) is connected to the pump body (3) by bolts.

8. A dry-shaft submersible pump according to claim 3, characterized in that: The curved pipe (12) is in communication with the liquid outlet of the pump body (3) and the water outlet section (11).

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