Submerged water feeding pump with water retention function

Abstract

A submerged water feeding pump with a water retention function comprises a motor, a base, a pump outer pipe, an inner pipe, a guide vane, a pump shaft, an impeller and a guide bearing, 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 mounted on the pump shaft, and the valve clack is not in contact with the pump shaft and can axially move along the pump shaft. A first sealing face capable of being in contact with each other is arranged between the sealing shaft sleeve and the valve clack, a second sealing face capable of being in contact with each other 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. Therefore, the pump cavity of the water feeding pump can be kept full of water during shutdown, and the water feeding pump and the main drainage pump connected with the water feeding pump can be started at the same time during restarting, so that the purpose of quick starting is achieved.

Description

Technical Field

[0001] The utility model and a submersible water feeding pump used in coal mines, in particular, relate to a submersible water feeding pump with a water retaining function used in coal mines. Background Art

[0002] There are four problems with the main drainage pumps running underground in traditional coal mines. The first is water pump cavitation, the second is low pump efficiency, the third is the short service life of the main drainage pump, and the fourth is slow startup. Many design institutes and coal mines have tried 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. Utility Model Content

[0005] The utility model aims to provide a submersible water-retaining feeding pump with a water-retaining function, which can keep the pump chambers of the submersible water-retaining feeding pump and the main drainage pump full of water after the water pump is stopped, and can start the feeding pump and the main drainage pump at the same time when restarting, so as to achieve the purpose of quick start.

[0006] A submersible feed water pump with a water retention function, comprising a motor, a base, an outer pump pipe, an inner pipe, a guide vane, a pump shaft, an impeller, and a guide bearing for supporting the pump shaft. The special feature is that a sealing shaft sleeve and a valve flap are sleeved on the pump shaft above the impeller from bottom to top. The sealing shaft sleeve is axially fixedly installed on the pump shaft. The valve flap does not contact the pump shaft and can move axially along the pump shaft. A first sealing surface capable of contacting each other is provided between the sealing shaft sleeve and the valve flap. A second sealing surface capable of contacting each other is provided between the valve flap and the guide vane. When the valve flap is reversely pressured, both the first sealing surface and the second sealing surface are in a sealed state, and either the first sealing surface or the second sealing surface is an elastic seal to achieve valve closing. When the valve flap is positively pressured, both the first sealing surface and the second sealing surface are in an open state to achieve valve opening.

[0007] Further, an elastic sealing sleeve integrally connected with the valve flap is provided on the valve flap. The first sealing surface on the valve flap is provided 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] Further, a guide shaft sleeve extending upward and sleeved on the pump shaft is provided on the valve flap. A positioning guide sleeve is provided on the inner wall of the outer pump pipe. The positioning guide sleeve and the guide shaft sleeve are in sliding fit, so that the valve flap and the pump shaft are always in a non-contact state.

[0009] Further, the elastic sealing sleeve includes a corrugated pipe hermetically connected to the valve flap and a metal ring hermetically connected to the lower end of the corrugated pipe. The first sealing surface is provided on the metal ring.

[0010] Further, both the first sealing surface and the second sealing surface are annular.

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

[0012] Further, the first sealing surface and the second sealing surface are respectively formed by surfacing.

[0013] Further, the sealing shaft sleeve is a split structure of upper and lower parts.

[0014] Further, the guide shaft sleeve and the valve flap are of an integral structure.

[0015] Further, the upper end surface of the pump shaft corresponding to the sealing shaft sleeve is stepped, and the upper end surface of the sealing shaft sleeve is stuck on the step of the pump shaft.

[0016] The beneficial effects of the present utility model are as follows: When the valve flap is pressed reversely, the first group of sealing surfaces come into contact first to achieve elastic sealing, and then the second group of sealing surfaces come into contact to achieve sealing, thereby ensuring that the valve flap can be tightly closed when the valve is closed, enabling the pump cavities of the main drainage pump and the feeding pump to remain full of water after the water pump stops. When starting again, the valve flap is pressed forward, and both groups of sealing surfaces are separated, allowing the feeding pump and the main drainage pump to be started simultaneously, achieving the purpose of rapid start. When starting for the first time, external cooling and lubricating water can be no longer used, achieving the purpose of energy conservation and water resource saving; and compared with the method of installing a foot valve at the inlet of the feeding pump, the suction height of the main drainage pump is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural view of the submersible feeding pump with water retention function of the present utility model;

[0018] Figure 2 is a schematic structural view of the outer pump pipe connected to the guide vane;

[0019] Figure 3 is a schematic structural view of the guide vane;

[0020] Figure 4 is a schematic structural view of the valve flap;

[0021] Figure 5 is a schematic structural view of the sealing shaft sleeve;

[0022] Figure 6 is a schematic structural view of the pump unit.

[0023] In the figure: motor - 1, base - 2, inner pipe - 3, pump shaft - 4, outer pump pipe - 5, valve flap - 6, guide vane - 7, impeller - 8, guide bearing - 9, sealing shaft sleeve - 10, first annular sealing surface - 11, elastic sealing sleeve - 12, second annular sealing surface - 13, positioning and guiding sleeve - 14, outlet pipe - 15, submersible feeding pump - 16, main drainage pump - 17, guiding shaft sleeve - 601, corrugated pipe - 1201, metal ring - 1202. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] As Figures 1-5As shown in the figure, a submersible feed water pump with a water retention function includes a motor 1, a base 2, an inner pipe 3, a pump outer pipe 5, a pump shaft 4, a pump outer pipe 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 pipe 5, the pump outer pipe 5 and the guide vane 7 are fixedly installed in sequence from top to bottom. The lower port of the pump outer pipe 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 from top to bottom. A sealing shaft sleeve 10 and a valve flap 6 are sleeved on the pump shaft 4 above the impeller 8 from bottom to top. An elastic sealing sleeve 12 integrally connected with the valve flap is arranged between the sealing shaft sleeve 10 and the valve flap 6. Annular sealing surfaces I 11 are respectively arranged on the contact surfaces of the sealing shaft sleeve 10 and the elastic sealing sleeve 12. Annular sealing surfaces II 13 are respectively arranged on the contact surfaces of the valve flap 6 and the guide vane 7. The valve flap 6 is closed through the annular sealing surface I and the annular sealing surface II. When the valve flap 6 is closed, the elastic sealing sleeve 12 is in a compressed state to elastically seal the annular sealing surface I.

[0025] In one embodiment, a guide shaft sleeve 601 extending upward and sleeved on the pump shaft is arranged on the valve flap 6. A positioning guide sleeve 14 is arranged on the inner wall of the pump outer pipe 5. The positioning guide sleeve 14 and the guide shaft sleeve 601 are in sliding fit, so that the valve flap 6 and the pump shaft 4 are always in a non-contact state.

[0026] In one embodiment, the elastic sealing sleeve 12 includes a corrugated pipe 1201 hermetically connected with the valve flap 6 and a metal ring 1202 hermetically connected with the lower end of the corrugated pipe 1201. The annular sealing surface I corresponding to the elastic sealing ring 12 is arranged on the metal ring 1202. The hermetic connection adopts a welding method.

[0027] In one embodiment, the two annular sealing surfaces I 11 and the annular sealing surface II 13 are respectively a large-surface and small-surface fit with different surface areas.

[0028] In one embodiment, the annular sealing surface I 13 and the annular sealing surface II 11 are respectively formed by surfacing with copper or cemented carbide.

[0029] In one embodiment, the sealing shaft sleeve 10 is of an upper and lower split structure for easy processing.

[0030] In one embodiment, the guide shaft sleeve 12 and the valve flap 6 are of an integral structure.

[0031] In one embodiment, the upper end surface of the pump shaft 4 corresponding to the sealing shaft sleeve 10 is stepped, and the upper end surface of the sealing shaft sleeve 10 is stuck on the step of the pump shaft 4.

[0032] In one embodiment, the lower port of the pump outer pipe 5 corresponding to the guide vane 7 is in an expanded shape.

[0033] As Figure 6As shown, during installation, the base of the submersible feed water pump 16 is installed on the pump house floor. The motor of the submersible feed water pump is located above the pump house floor. The pump outer pipe and the guide vane extend down into the mine to immerse the impeller in water, and the submersible feed water pump 16 and the main drainage pump 17 are formed into a pump set;

[0034] Before the first start-up, cooling and lubricating water is first injected into the submersible feed water pump. The source of the cooling and lubricating water is pre-reserved or taken from the suction well to cool and lubricate the guide bearing. Start the submersible feed water pump. Under the action of the water flow, the valve flap is pressed forward to open, and the water in the feed water pump is transported to the main drainage pump. After the main drainage pump is filled with water, start the main drainage pump to drain water; after shutdown, under the action of gravity, the valve flap is pressed backward to close, so that the pump cavities of the feed water pump and the main drainage pump remain full of water; when the pump set is started again, start the feed water pump and the main drainage pump at the same time to complete the drainage operation.

[0035] The above are only specific embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A submersible water feeding pump with water retention function, 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 pump outer 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 first sealing surface and the second sealing surface are formed by surfacing welding respectively.

8. 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.

9. The submersible water feeding pump with water retention function according to claim 3 is characterized in that: The guide sleeve and the valve disc are an integrated structure.

10. The submersible water feeding pump with water retention function according to claim 1, 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.

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