Mining water pump with anti-explosion performance

Abstract

The utility model aims to provide a mining water pump with explosion-proof performance, which comprises a pump body, a sealing body for leading out a power cable is arranged on the pump body, a mechanical sealing structure for sealing the power cable is arranged on the sealing body, and the mechanical sealing structure comprises an oil sealing cavity, an upper sealing head and a sealing assembly. The utility model relates to the technical field of explosion-proof water pumps, and effectively solves the potential safety hazard in the prior art by arranging a mechanical sealing structure at a power supply cable. Specifically, a first sealing ring, a second sealing ring and a sealing assembly formed by combining the first sealing ring, the second sealing ring and an outer sealing ring are used for sealing the outer side of the joint of the power cable and the pump body. Through the inner side sealing structure of the oil seal cavity, the inner side of the joint of the power cable and the pump body is sealed, and the double-sealing effect is achieved. The double-sealing design remarkably improves the sealing performance of the position, led out of the pump body, of the power cable, and the electric leakage phenomenon is effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of explosion -proof water pump, concretely is a mine water pump with explosion -proof performance. BACKGROUND

[0002] In the process of metal or nonmetal mine exploitation and coal mine exploitation, or in the case of water inrush accident in mine, a large amount of accumulated water will be formed quickly, which not only affects the normal operation of mine, but also seriously threatens the safety production of mine. In this case, the stability and reliability of mine drainage system are particularly important. The mine drainage system usually relies on various types of water pumps to complete the drainage task, however, due to the particularity of mine environment, these water pumps not only have high drainage capacity, but also must meet the safety requirements of explosion -proof.

[0003] The existing explosion -proof water pump meets the use requirements of mine environment to some extent, but still has some shortcomings. Especially in the sealing structure of power cable, the existing explosion -proof water pump mostly adopts simple sealing design, which is easy to cause sealing performance decline in the long -term operation in the corrosive environment of mine.

[0004] Due to the corrosive medium and mechanical wear in mine environment, the simple sealing structure is easy to age or damage, resulting in the occurrence of electric leakage. This not only affects the normal work of water pump, more importantly, electric leakage may cause electric spark, increasing the risk of explosion in mine. Therefore, the existing explosion -proof water pump has certain safety hidden danger in the process of use, especially in improving the sealing performance of power cable and pump body connection, which needs to be further improved and improved to ensure the safety and stability of water pump in long -term operation. UTILITY MODEL CONTENTS

[0005] In view of the defects of the prior art, the utility model provides a mine water pump with explosion -proof performance, which solves the problem of poor sealing performance of the sealing structure of power cable of the existing mine water pump.

[0006] In order to achieve the above purpose, the utility model realizes the following technical scheme: a mine water pump with explosion -proof performance, comprising a pump body, the pump body is provided with an envelope for leading out power cable, the envelope is provided with a mechanical sealing structure for sealing the power cable, the mechanical sealing structure comprises:

[0007] Oil seal cavity, open in the inside of the envelope, the power cable penetrates the oil seal cavity;The envelope is provided with an oil injection hole communicated with the oil seal cavity;

[0008] An upper head fixed on the top of the enclosure, a sealing cavity is formed in the interior of the upper head, and an end cover is fixed on the top of the upper head to close the sealing cavity; the power cable passes through the sealing cavity and the end cover;

[0009] A sealing assembly is arranged in the sealing cavity and is sleeved on the outer wall of the power cable; the sealing assembly comprises:

[0010] An inner sealing ring, an outer inclined surface is arranged on the outer wall surface of the inner sealing ring, and a sealing surface is formed on the inner wall surface;

[0011] An outer sealing ring, the outer sealing ring is provided with an inner inclined surface;

[0012] When the end cover is fixed on the top of the upper head, the inner sealing ring is compressed, and the sealing surface is tightly attached to the power cable.

[0013] Preferably, the inner sealing ring comprises a first sealing ring and a second sealing ring arranged oppositely, and the outer inclined surface is formed on the outer wall surface of the opposite surfaces of the first sealing ring and the second sealing ring.

[0014] Preferably, the outer sealing ring is located between the first sealing ring and the second sealing ring, and the outer wall surface of the outer sealing ring abuts against the inner wall surface of the sealing cavity;

[0015] The inner inclined surface is formed on the inner side of the outer sealing ring, and the two inner inclined surfaces abut against the outer inclined surfaces of the first sealing ring and the second sealing ring.

[0016] Preferably, a top sealing ring is arranged between the end cover and the power cable, and the top sealing ring is fixed on the end cover by a compression ring.

[0017] Preferably, the oil sealing cavity is divided into an inner oil cavity and an outer oil cavity by a partition plate, a through hole is formed in the partition plate to connect the inner oil cavity and the outer oil cavity, and the power cable passes through the inner oil cavity.

[0018] Preferably, an outer sealing ring is sealingly connected to the outer side of the outer oil cavity.

[0019] Preferably, a piston ring is movably arranged in the outer oil cavity, and the top of the piston ring is connected to the inner wall of the outer oil cavity by a spring.

[0020] Preferably, an upper sealing ring is arranged between the top of the inner oil cavity and the power cable.

[0021] Preferably, a lower sealing ring is arranged between the bottom of the inner oil cavity and the power cable.

[0022] Beneficial effects

[0023] By using the mine water pump with explosion-proof performance, the mechanical sealing structure is arranged at the power cable, and the safety hidden danger in the prior art is effectively solved. Specifically, the first sealing ring and the second sealing ring, and the sealing assembly formed by the outer sealing ring are adopted, the outer side of the power cable and the pump body connection is sealed, and the sealing effect is enhanced. In addition, the inner side sealing structure of the oil seal cavity is used to seal the inner side of the power cable and the pump body connection, and the double sealing effect is formed. The double sealing design significantly improves the sealing performance of the power cable leading out of the pump body position, and even in long time operation and harsh environment, the good sealing state can be maintained, and the occurrence of electric leakage phenomenon is effectively prevented. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a pump body structure schematic view of the utility model;

[0025] Figure 2 It is a sealing body structure schematic view of the utility model;

[0026] Figure 3 It is a pump body structure schematic view of the utility model Figure 2 It is an enlarged structure schematic view of A place in the utility model.

[0027] Explanation of symbols in the drawing

[0028] 1, pump body, 2, sealing body, 3, power cable, 4, upper head, 5, end cover, 6, inner oil cavity, 7, sealing cavity, 8, oil injection hole, 9, through hole, 10, outer sealing ring, 11, baffle, 12, spring, 13, piston ring, 14, outer oil cavity, 15, lower sealing ring, 16, upper sealing ring, 17, first sealing ring, 18, second sealing ring, 19, outer inclined surface, 20, outer sealing ring, 21, inner inclined surface, 22, sealing surface. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. As long as the effect of the utility model can be played, various changes can be made to the implementation scheme.

[0030] By the personnel in the art, the parts in the case are sequentially connected, and the specific connection and operation sequence should be referred to the following working principle, and the detailed connection means is the known technology in the art, and the following mainly introduces the working principle and process.

[0031] Reference Figures 1-3 The mine water pump with explosion-proof performance of the embodiment is described.

[0032] The mine water pump includes a pump body 1, on which a sealing body 2 is provided for the power cable 3 to be led out, and a mechanical seal structure is provided on the sealing body 2 to seal the power cable 3.

[0033] like Figure 2 As shown, in one embodiment, the mechanical seal structure includes an oil seal cavity, an upper end cap 4, and a sealing assembly. The oil seal cavity is located inside the seal body 2 and is filled with sealing oil. The power cable 3 passes through the oil seal cavity, and the sealing oil fills the gap between the power cable 3 and the seal body 2, thus serving as an inner sealing structure.

[0034] Furthermore, the sealing body 2 has an oil injection hole 8 that communicates with the oil seal cavity, and the sealing oil is injected into the oil seal cavity through the oil injection hole 8 by the oil injection gun.

[0035] Furthermore, in this embodiment, the upper end cap 4 is fixed to the top of the sealing body 2, and a sealing cavity 7 is formed inside the upper end cap 4. The sealing assembly is disposed in the sealing cavity 7 and is sleeved on the outer wall of the power cable 3. The sealing assembly serves as the outer sealing structure, and the inner sealing structure and the outer sealing structure form a double seal, sealing the gap between the power cable 3 and the sealing body 2 and the upper end cap 4, thereby improving the sealing effect at the position where the power cable 3 exits the pump body 1.

[0036] The top of the upper end cap 4 is fixed with an end cap 5 that snaps into the sealing cavity 7 to form a seal on the sealing cavity 7 and to fix the internal sealing structure. The power cable 3 passes through the sealing cavity 7 and the end cap 5.

[0037] In a preferred embodiment, the sealing assembly includes an inner sealing ring and an outer sealing ring 20 that cooperate with each other; the outer wall surface of the inner sealing ring is provided with an outer inclined surface 19, and the inner wall surface is formed with a sealing surface 22; the outer sealing ring is provided with an inner inclined surface 21; wherein, when the end cap 5 is fixed on the top of the upper end cap 4, the inner sealing ring is pressed together, and under the action of the inner inclined surface 21 and the outer inclined surface 19, the inner sealing ring moves inward so that the sealing surface 22 is tightly attached to the power cable 3, forming an outer sealing structure.

[0038] Specifically, such as Figure 3 As shown, the inner sealing ring includes a first sealing ring 17 and a second sealing ring 18 disposed opposite to each other, and an outer inclined surface 19 is formed on the outer wall surface of the opposite surfaces of the first sealing ring 17 and the second sealing ring 18.

[0039] The outer sealing ring 20 is located between the first sealing ring 17 and the second sealing ring 18, and the outer wall surface of the outer sealing ring 20 abuts against the inner wall surface of the sealing cavity 7; the inner inclined surface 21 is formed on the inner upper and lower surfaces of the outer sealing ring 20, and the two inner inclined surfaces 21 abut against the outer inclined surfaces 19 of the first sealing ring 17 and the second sealing ring 18.

[0040] With the above design, after the end cover 5 is buckled, the end cover 5 presses the first sealing ring 17 to move downward, the first sealing ring 17 and the second sealing ring 18 extrude the outer sealing ring 20, the outer edge of the outer sealing ring 20 abuts against the inner wall surface of the upper head 4, at this time, the outer inclined surface 19 on the inner side of the first sealing ring 17 and the second sealing ring 18 slides on the inner inclined surface 18, the first sealing ring 17 and the second sealing ring 18 move relatively, and the first sealing ring 17 and the second sealing ring 18 are tightened inward, the sealing surface 22 is tightly attached to the power cable 3 to realize sealing.

[0041] Further, a top sealing ring is arranged between the end cover 5 and the power cable 3, and the top sealing ring is fixed on the end cover 5 through a pressing ring. The top sealing ring forms preliminary sealing at the end cover 5, preliminarily prevents external gas and dust from entering, and prevents friction between the power cable 3 and the end cover 5, thereby improving protection of the power cable 3.

[0042] In an embodiment, the oil sealing cavity is divided into an inner oil cavity 6 and an outer oil cavity 14 by a partition plate 11, the partition plate 11 is provided with a through hole 9 for connecting the inner oil cavity 6 and the outer oil cavity 14; the partition plate 11 is in an annular structure, that is, after the inner oil cavity 6 and the outer oil cavity 14 are respectively machined in the inner cavity and the outer side of the sealing body 2, an annular wall thickness interval is left between the inner oil cavity 6 and the outer oil cavity 14 to form the partition plate 11.

[0043] The power cable 3 penetrates the inner oil cavity 6. An upper sealing ring 16 is arranged between the top of the inner oil cavity 6 and the power cable 3, and a lower sealing ring 15 is arranged between the bottom of the inner oil cavity 6 and the power cable 3. The upper sealing ring 16 and the lower sealing ring 15 seal the upper and lower ends of the inner oil cavity 6 to prevent internal sealing oil from leaking.

[0044] The outer oil cavity 14 is sealingly connected with an outer sealing ring 10, and the outer sealing ring 10 completely wraps the outer oil cavity 14. A piston ring 13 is movably arranged in the outer oil cavity 14, and the top of the piston ring 13 is connected to the inner side of the outer oil cavity 14 through a spring 12. When the temperature of the power cable 3 rises for a long time, heat is transferred to the inner oil cavity 6, so that the internal sealing oil is heated and expanded. At this time, the expanded sealing oil can enter the outer oil cavity 14 through the through hole 9, and the increased sealing oil in the outer oil cavity 14 drives the piston ring 13 to rise to make the spring 12 retract. When the temperature inside the pump body 1 decreases (for example, the pump body stops working), the temperature of the power cable 3 decreases, at this time, the sealing oil does not expand but shrinks, at this time, the spring 12 pushes the sealing oil in the outer oil cavity 14 to flow back to the inner oil cavity 6 through the through hole 9, thereby ensuring the oil sealing effect of the inner oil cavity 6 on the power cable 3.

[0045] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mine-used water pump with explosion-proof performance, comprising a pump body, an envelope is arranged on the pump body for leading out a power cable, characterized in that: The sealing body is provided with a mechanical sealing structure for sealing the power cable, and the mechanical sealing structure comprises: An oil sealing cavity is formed in the inside of the sealing body, and the power cable penetrates the oil sealing cavity; an oil injection hole is formed in the sealing body and communicates with the oil sealing cavity; An upper sealing head is fixed on the top of the sealing body, and a sealing cavity is formed in the inside of the upper sealing head; an end cover is fixed on the top of the upper sealing head and covers the sealing cavity; the power cable penetrates the sealing cavity and the end cover; A sealing assembly is arranged in the sealing cavity and covers the outer wall of the power cable; the sealing assembly comprises: An inner sealing ring, and an outer inclined surface is arranged on the outer wall surface of the inner sealing ring, and a sealing surface is formed on the inner wall surface; An outer sealing ring, and an inner inclined surface is arranged on the outer sealing ring; When the end cover is fixed on the top of the upper sealing head, the inner sealing ring is compressed, and the sealing surface is tightly attached to the power cable.

2. The mine water pump with explosion-proof performance according to claim 1, characterized in that: The inner sealing ring comprises a first sealing ring and a second sealing ring arranged oppositely, and the outer inclined surface is arranged on the outer wall surface of the opposite surfaces of the first sealing ring and the second sealing ring.

3. The mine water pump with explosion-proof performance according to claim 1, characterized in that: The outer sealing ring is located between the first sealing ring and the second sealing ring, and the outer wall surface of the outer sealing ring abuts against the inner wall surface of the sealing cavity; The inner inclined surface is formed on the inner side of the outer sealing ring, and the two inner inclined surfaces abut against the outer inclined surfaces of the first sealing ring and the second sealing ring.

4. The mine water pump with explosion-proof performance according to claim 1, characterized in that: A top sealing ring is arranged between the end cover and the power cable, and the top sealing ring is fixed on the end cover by a compression ring.

5. The mine water pump with explosion-proof performance according to claim 1, characterized in that: The oil sealing cavity is divided into an inner oil cavity and an outer oil cavity by a partition plate, and a through hole is formed in the partition plate to communicate the inner oil cavity and the outer oil cavity; the power cable penetrates the inner oil cavity.

6. The mine water pump with explosion-proof performance according to claim 5, characterized in that: An outer sealing ring is sealingly connected to the outer side of the outer oil cavity.

7. The mine water pump with explosion-proof performance according to claim 6, characterized in that: A piston ring is movably arranged in the outer oil cavity, and the top of the piston ring is connected to the outer oil cavity by a spring.

8. The mine water pump with explosion-proof performance according to claim 5, characterized in that: An upper sealing ring is arranged between the top of the inner oil cavity and the power cable.

9. The mine water pump with explosion-proof performance according to claim 5, characterized in that: A lower sealing ring is arranged between the bottom of the inner oil cavity and the power cable.

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