Submerged type water retention water feeding pump and starting method of pump set adopting water feeding pump

Abstract

The invention relates to a submerged water retention water feeding pump and a starting method of a pump set adopting the water feeding pump, the submerged water retention water feeding pump comprises a motor, a base, a pump outer pipe, an inner pipe, a guide vane, a pump shaft and an impeller, a sealing shaft sleeve and a valve clack are respectively sleeved on the pump shaft and above the impeller from bottom to top, the sealing shaft sleeve is axially and fixedly arranged on the pump shaft, and the sealing shaft sleeve is fixedly arranged on the pump shaft. The valve clack is not in contact with the pump shaft and can move in the axial direction of the pump shaft, a first sealing face is arranged between the sealing shaft sleeve and the valve clack, a second sealing face is arranged between the valve clack and the guide vane, when the valve clack is reversely pressed, the first sealing face and the second sealing face are both in a sealing state, the first sealing face or the second sealing face is in elastic sealing, and valve closing is achieved. When the valve clack is pressed in the forward direction, the first sealing face and the second sealing face are both in an open state, and valve opening is achieved. The water feeding pump and the main draining pump can be kept full of water during shutdown, and the water feeding pump and the main draining pump connected with the water feeding pump can be started simultaneously during restarting, so that the purpose of quick starting is achieved.

Description

Technical Field

[0001] The present invention and a submersible water feeding pump for underground coal mines particularly relate to a submersible water retaining water feeding pump for underground coal mines and a method for starting a pump group using the water feeding pump. Background Art

[0002] There are three fatal problems with the main drainage pump running underground in coal mines. The first is water pump cavitation, the second is low pump efficiency, and the third is the short service life of the main drainage pump. Many design institutes and coal mines try to use a pre-pump (including submersible pumps, horizontal water feeding pumps, etc.) at the front end of the main drainage pump. The pre-pump and the main drainage pump form a drainage pump group, mainly to solve the cavitation problem of the water pump. There are many problems with the structure of the above-mentioned pre-pump. For example, although the submersible pump can solve the cavitation problem, it is inconvenient to repair, has a high failure rate, and has poor safety. Therefore, it is not suitable for use underground in coal mines. Although the horizontal water feeding pump can partially solve the suction range problem of the main drainage pump, it itself needs to evacuate and detect the vacuum degree of the pump body, which is cumbersome and increases the failure points. Therefore, it has not been popularized. The use of a submersible water feeding pump and a main drainage pump to form a drainage pump group can better solve this problem.

[0003] The submersible water pump is a vertical structure with an immersion impeller and a motor above the ground, which is suitable for use in coal mines. However, this structure has the following problems: For example, the water pump is a vertical long-axis pump structure. Since the pump shaft is very long, it needs several guide bearings in the middle for support. The guide bearings are made of rubber. When the water pump is running, an external water source is required for continuous cooling and lubrication. External clean water requires the laying of cooling water pipelines, which is time-consuming and troublesome, and it is easy to damage the water pump due to pipeline failure. In addition, the continuous use of external water sources does not meet the requirements of energy conservation and emission reduction.

[0004] This type of problem can be solved by installing a bottom valve at the inlet of the water feeding pump. Due to the limited depth of the coal mine's water suction well, the height of the bottom valve is generally about 0.5 meters. After the bottom valve is installed, the water suction height of the main drainage pump will be reduced, resulting in a decrease in drainage volume and a reduction in the effective volume of the water tank, which is very unfavorable for safe production and energy conservation and emission reduction. Summary of the invention

[0005] The object of the present invention is to provide a submersible water-retaining feeding pump and a method for starting a pump group using the feeding pump, which can keep the pump cavities of the submersible water-retaining feeding pump and the main drainage pump full of water after the water pump is shut down, and can start the feeding pump and the main drainage pump at the same time when starting again, thereby achieving the purpose of quick starting.

[0006] A submersible water-retaining and feeding pump comprises a motor, a base, a pump outer tube, an inner tube, a guide vane, a pump shaft, an impeller, and a guide bearing for supporting the pump shaft. The pump shaft is special in that a sealing sleeve and a valve disc are respectively mounted on the impeller from bottom to top, the sealing sleeve is axially fixedly mounted on the pump shaft, the valve disc does not contact the pump shaft and can move axially along the pump shaft, a sealing surface 1 that can contact each other is provided between the sealing sleeve and the valve disc, a sealing surface 2 that can contact each other is provided between the valve disc and the guide vane, when the valve disc is subjected to reverse pressure, the sealing surface 1 and the sealing surface 2 are both in a sealed state, and the sealing surface 1 or the sealing surface 2 is an elastic seal to achieve valve closing; when the valve disc is subjected to positive pressure, the sealing surface 1 and the sealing surface 2 are both in an open state to achieve valve opening.

[0007] Furthermore, an elastic sealing sleeve connected to the valve disc as a whole is arranged on the valve disc, a sealing surface on the valve disc is arranged on the lower surface of the elastic sealing sleeve, and the elastic sealing sleeve is in a compressed state when the valve is closed.

[0008] Furthermore, the valve disc is provided with a guide sleeve extending upward and sleeved on the pump shaft, and a positioning guide sleeve is provided on the inner wall of the pump outer tube. The positioning guide sleeve and the guide sleeve are slidably matched to ensure that the valve disc and the pump shaft are always in a non-contact state.

[0009] Furthermore, the elastic sealing sleeve comprises a bellows sealingly connected to the valve disc and a metal ring sealingly connected to the lower end of the bellows, and the sealing surface is arranged on the metal ring.

[0010] Furthermore, the sealing surface 1 and the sealing surface 2 are both annular.

[0011] Furthermore, the lower port of the pump outer pipe corresponding to the guide vane is in an expansion shape.

[0012] Furthermore, the sealing sleeve is a split structure consisting of upper and lower parts.

[0013] Furthermore, the upper end surface of the pump shaft corresponding to the sealing sleeve is stepped, and the upper end surface of the sealing sleeve is clamped on the step of the pump shaft.

[0014] A method for starting a pump group using the submersible water-retaining and water-feeding pump as described above comprises:

[0015] S1. Install the submersible water-retaining and feeding pump base on the floor of the pump house. The motor of the submersible water-retaining and feeding pump is located above the floor of the pump house. The outer pipe of the pump is lowered into the mine so that the impeller is immersed in water. The submersible water-retaining and feeding pump and the main drainage pump form a pump group.

[0016] S2. Before the first start, inject cooling and lubricating water into the submerged water feeding pump to cool and lubricate the guide bearing; start the submerged water feeding pump, and the valve disc is positively pressed open under the action of the water flow, and the water in the water feeding pump is transported to the main drainage pump. After the water in the main drainage pump is full, start the main drainage pump to drain water;

[0017] S3. After shutdown, the valve disc is reversely pressed and closed under the action of gravity, so that the pump chambers of the water feeding pump and the main drainage pump remain full of water;

[0018] S4. When restarting, start the water feeding pump and the main drainage pump at the same time.

[0019] Furthermore, the cooling and lubricating water is sourced from pre-reserved or taken from the surrounding area of ​​the site.

[0020] The beneficial effects of the present invention are as follows: when the valve disc is reversely pressurized, one set of sealing surfaces first contact each other to achieve elastic sealing, and then another set of sealing surfaces contact each other to achieve sealing, thereby ensuring that the valve disc can be tightly closed when closed, and the pump chambers of the main drainage pump and the water feeding pump can be kept full of water after the water pump is shut down. When the valve disc is positively pressurized when starting again, the two sets of sealing surfaces are separated, and the water feeding pump and the main drainage pump can be started at the same time, achieving the purpose of rapid starting. External cooling and lubricating water is no longer needed during the first start-up, achieving the purpose of energy saving and water resource saving, and compared with the method of installing a bottom valve at the inlet of the water feeding pump, the water suction height of the main drainage pump is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the submersible water-retaining and water-feeding pump of the present invention;

[0022] Figure 2 It is a schematic diagram of the pump outer pipe structure corresponding to the guide vane;

[0023] Figure 3 It is a schematic diagram of the guide vane structure;

[0024] Figure 4 It is a schematic diagram of the valve disc structure;

[0025] Figure 5 It is a schematic diagram of the sealing sleeve structure;

[0026] Figure 6 It is a schematic diagram of the pump group structure.

[0027] In the figure: motor 1, base 2, inner tube 3, pump shaft 4, pump outer tube 5, valve disc 6, guide vane 7, impeller 8, guide bearing 9, sealing sleeve 10, annular sealing surface 1 -11, elastic sealing sleeve 12, annular sealing surface 2 -13, positioning guide sleeve 14, outlet pipe 15, submersible water feeding pump 16, main drainage pump 17, guide sleeve 601, bellows 1201, metal ring 1202. DETAILED DESCRIPTION

[0028] like Figure 1-5 As shown, a submersible water-retaining and feeding pump comprises a motor 1, a base 2, an inner tube 3, a pump outer tube 5, a pump shaft 4, a pump outer tube 5, a guide vane 7, a guide bearing 9 for supporting the pump shaft, an impeller 8 and an outlet pipe 15. The motor 1, the base 2, the pump outer tube 15, the pump outer tube 5 and the guide vane 7 are fixedly installed in sequence up and down, and the lower port of the pump outer tube 14 corresponding to the guide vane 7 is in an expanded shape. The output shaft of the motor 1, the pump shaft 4 and the impeller 8 are fixedly installed in sequence up and down, and the impeller 8 is located on the pump shaft 4 from bottom to top. A sealing sleeve 10 and a valve disc 6 are separately provided, and an elastic sealing sleeve 12 connected to the valve disc as a whole is arranged between the sealing sleeve 10 and the valve disc 6. An annular sealing surface 11 is respectively arranged on the contact surface of the sealing sleeve 10 and the elastic sealing sleeve 12, and an annular sealing surface 2 13 is respectively arranged on the contact surface of the valve disc 6 and the guide vane 7. The valve disc 6 is closed by the annular sealing surface 1 and the annular sealing surface 2, and when the valve disc 6 is closed, the elastic sealing sleeve 12 is in a compressed state to make the annular sealing surface 1 elastically sealed.

[0029] In one embodiment, the valve flap 6 is provided with a guide sleeve 601 extending upward and sleeved on the pump shaft, and a positioning guide sleeve 14 is provided on the inner wall of the guide tube 5. The positioning guide sleeve 14 and the guide sleeve 601 are slidably matched, so that the valve flap 6 and the pump shaft 4 are always in a non-contact state.

[0030] In one embodiment, the elastic sealing sleeve 12 includes a bellows 1201 sealed to the valve disc 6 and a metal ring 1202 sealed to the lower end of the bellows 1201, and an annular sealing surface corresponding to the elastic sealing ring 12 is arranged on the metal ring 1202, and the sealing connection is achieved by welding.

[0031] In one embodiment, the two annular sealing surfaces 11 and the two annular sealing surfaces 13 are respectively large and small surfaces with different surface areas.

[0032] In one embodiment, the annular sealing surface 11 and the annular sealing surface 2 13 are respectively made of copper or cemented carbide and are formed by surfacing.

[0033] In one embodiment, the sealing sleeve 10 is a split structure consisting of upper and lower parts for easy processing.

[0034] In one embodiment, the guide sleeve 12 and the valve flap 6 are an integral structure.

[0035] In one embodiment, the upper end surface of the pump shaft 4 corresponding to the sealing sleeve 10 is stepped, and the upper end surface of the sealing sleeve 10 is clamped on the step of the pump shaft 4 .

[0036] A method for starting a pump group using the above-mentioned submersible water-retaining and water-feeding pump comprises:

[0037] S1, such as Figure 6 As shown, during installation, the base of the submersible water-retaining and feeding pump 16 is installed on the floor of the pump room, the motor of the submersible water-retaining and feeding pump is located above the floor of the pump room, the guide pipe and the guide vane are lowered into the mine to immerse the impeller in water, and the submersible water-retaining and feeding pump 16 and the main drainage pump 17 form a pump group;

[0038] S2. Before the first start, first inject cooling and lubricating water into the submerged water feeding pump to cool and lubricate the guide bearing 9, start the submerged water feeding pump, and under the action of the water flow, the valve flap 6 is positively pressurized and opened, and the water in the water feeding pump is transported to the main drainage pump. After the main drainage pump is full of water, start the main drainage pump to drain water;

[0039] S3. After shutdown, the valve disc is reversely pressed and closed under the action of gravity, so that the pump chambers of the water feeding pump and the main drainage pump remain full of water;

[0040] S4. When the pump group is started again, the water feeding pump and the main drainage pump are started at the same time to complete the drainage operation.

[0041] Furthermore, the cooling and lubricating water is sourced from a pre-reserved or taken from a water absorption well.

[0042] The above are only specific embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A submersible water-retaining and water-feeding pump, comprising a motor, a base, a pump outer tube, an inner tube, a guide vane, a pump shaft, an impeller, and a guide bearing for supporting the pump shaft, characterized in that: A sealing sleeve and a valve disc are respectively mounted on the pump shaft above the impeller from bottom to top, the sealing sleeve is axially fixedly mounted on the pump shaft, the valve disc does not contact the pump shaft and can move axially along the pump shaft, a sealing surface 1 that can contact each other is provided between the sealing sleeve and the valve disc, and a sealing surface 2 that can contact each other is provided between the valve disc and the guide vane, when the valve disc is reversely pressurized, the sealing surface 1 and the sealing surface 2 are both in a sealed state, and the sealing surface 1 or the sealing surface 2 is an elastic seal to achieve valve closing; when the valve disc is positively pressurized, the sealing surface 1 and the sealing surface 2 are both in an open state to achieve valve opening.

2. A submersible water feeding pump with water retention function according to claim 1, characterized in that: An elastic sealing sleeve connected to the valve disc is arranged on the valve disc, and a sealing surface on the valve disc is arranged on the lower surface of the elastic sealing sleeve. When the valve is closed, the elastic sealing sleeve is in a compressed state.

3. The submersible water feeding pump with water retention function according to claim 1 is characterized in that: The valve flap is provided with a guide sleeve extending upward and sleeved on the pump shaft, and the inner wall of the guide tube is provided with a positioning guide sleeve. The positioning guide sleeve and the guide sleeve are slidably matched to ensure that the valve flap and the pump shaft are always in a non-contact state.

4. The submersible water feeding pump with water retention function according to claim 2 is characterized in that: The elastic sealing sleeve comprises a bellows sealed with the valve flap and a metal ring sealed with the lower end of the bellows, and the sealing surface on the valve flap is arranged on the metal ring.

5. The submersible water feeding pump with water retention function according to claim 1 is characterized in that: The sealing surface 1 and the sealing surface 2 are both annular.

6. The submersible water feeding pump with water retention function according to claim 1 is characterized in that: The lower port of the pump outer pipe corresponding to the guide vane is expanded.

7. The submersible water feeding pump with water retention function according to claim 1 is characterized in that: The sealing sleeve is a split structure with upper and lower parts.

8. The submersible water feeding pump with water retention function according to claim 1 is characterized in that: The upper end surface of the pump shaft corresponding to the sealing sleeve is stepped, and the upper end surface of the sealing sleeve is clamped on the step of the pump shaft.

9. A method for starting a pump unit using the submersible water-retaining and water-feeding pump as claimed in claim 1, characterized in that: include: S1. Install the submersible water-retaining and feeding pump base on the floor of the pump room. The motor of the submersible water-retaining and feeding pump is located above the floor of the pump room. The outer pipe of the pump is lowered into the water suction well so that the impeller is immersed in the water. The submersible water-retaining and feeding pump and the main drainage pump form a pump unit. S2. Before the first start, inject cooling and lubricating water into the submerged water feeding pump to cool and lubricate the guide bearing; start the submerged water feeding pump, and the valve disc is positively pressed open under the action of the water flow, and the water in the water feeding pump is transported to the main drainage pump. After the water in the main drainage pump is full, start the main drainage pump to drain water; S3. After shutdown, the valve disc is reversely pressed and closed under the action of gravity, so that the pump chambers of the water feeding pump and the main drainage pump remain full of water; S4. When restarting, start the water feeding pump and the main drainage pump at the same time.

10. A method for starting a pump unit using the submersible water-retaining and water-feeding pump according to claim 9, characterized in that: The cooling and lubricating water is sourced from a pre-stored or taken from a water absorption well.

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