An explosion-proof slurry pump with pressure relief structure

Abstract

The present invention provides an explosion-proof slurry pump with a pressure relief structure, which relates to the technical field of slurry pumps; the explosion-proof slurry pump with a pressure relief structure comprises a pump casing and a sheath arranged in the pump casing, and also comprises a pressure relief component; and the pressure relief component comprises an outer sleeve, an explosion-proof column and a fixing unit; the outer sleeve is inserted on the pump casing and the sheath, the explosion-proof column is inserted in the outer sleeve, a plurality of first limiting grooves are arranged on the inner wall of the outer sleeve, each first limiting groove extends outward from the inner end surface of the outer sleeve, a plurality of first limiting blocks are arranged on the outer periphery of the explosion-proof column, each first limiting block can be abutted against the bottom surface of each first limiting groove in a one-to-one correspondence, and a fracture induction groove is respectively arranged between each first limiting block and the explosion-proof column; the explosion-proof column can be separated from each first limiting block and come out of the outer sleeve when the pressure in the explosion-proof slurry pump is greater than the pressure threshold. The explosion-proof slurry pump with a pressure relief structure of the present invention can replace the pressure relief component more conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of slurry pumps, and in particular to an explosion-proof slurry pump with a pressure relief structure. Background Art

[0002] A slurry pump is a centrifugal pump that transports suspended particles in liquid. It is widely used in mining, electricity, metallurgy, coal, environmental protection and other industries to transport slurries containing solid particles, such as ore slurry transportation in metallurgical ore dressing plants, hydraulic ash removal in thermal power plants, coal slurry and heavy medium transportation in coal washing plants, dredging of rivers, river desilting, etc.

[0003] Since the transported liquid contains solid particles, the slurry pump may have the problem of blockage of the inlet or outlet pipe during use. If the pressure cannot be relieved in time, the pressure in the pump will increase sharply, which may easily cause rapid wear and damage of the pump parts. In severe cases, it may even cause explosions, pipeline ruptures and other accidents.

[0004] In order to prevent the above situation from happening, there are two common explosion-proof methods for slurry pumps: one is to release pressure by setting a pressure relief valve on the sealing ring on the pump casing facing the transmission shaft side, and the other is to add an internal pressure monitoring device on the pump casing and shut down the pump according to the feedback of the internal pressure monitoring device to avoid excessive pressure in the pump body. However, these two methods still have the possibility of untimely pressure relief. For the former, the casing of the slurry pump is generally composed of an internal volute and an external pump casing. The pressure relief valve is set on the sealing ring of the pump casing, which is very easy to accumulate solid particles and other impurities, so it is very easy to be blocked, and the leakage channel between the volute and the pump casing is very small. It only relies on the leaking liquid for pressure relief, and the pressure relief capacity is very limited; for the latter, although shutdown pressure relief is the most effective method, its control speed is affected by the sensitivity and stability of the sensor and processor, and the operating environment of the slurry pump is usually relatively harsh, the operating vibration is very large, and the long-term operation makes the sensor, processor and circuit easy to age and fail.

[0005] In response to the above problems, the invention patent with application number 2023108822130 provides a safe explosion-proof slurry pump, which provides an explosion-proof rod with a release ring on the pump casing and the volute. When the pressure in the pump body is too high, the explosion-proof rod can detach from the release ring and disengage from the volute and the pump casing, thereby forming a pressure relief channel to complete the pressure relief.

[0006] However, the above solution still has the following technical problems: when the explosion-proof rod is dislocated due to pipeline problems and the slurry pump is depressurized, after the fault is eliminated, the slurry pump still needs to be disassembled and the explosion-proof rod with the release ring reinstalled before it can be put into use again, which is inconvenient. Summary of the invention

[0007] To this end, the present invention proposes an explosion-proof slurry pump with a pressure relief structure to at least partially solve the technical problem that the existing explosion-proof slurry pump mentioned in the background technology is relatively inconvenient to use.

[0008] The technical solution of the present invention is as follows:

[0009] A kind of explosion-proof slurry pump with pressure relief structure, comprising a pump casing and a sleeve arranged in the pump casing, the pump casing is provided with a first pressure relief hole, the sleeve is provided with a second pressure relief hole opposite to the first pressure relief hole, and also comprises a pressure relief assembly, the pressure relief assembly comprises an outer sleeve, an explosion-proof column and a fixing unit, the outer sleeve is inserted in the first pressure relief hole and the second pressure relief hole, the explosion-proof column is inserted in the outer sleeve, a fixing block located outside the pump casing is provided on the outer periphery of the outer sleeve, a plurality of first limiting grooves are provided on the inner wall of the outer sleeve, each of the first limiting grooves surrounds the outer sleeve The explosion-proof column is evenly and spaced apart in the circumferential direction and extends outward from the inner end surface of the outer sleeve. A plurality of first limit blocks are provided on the outer circumference of the explosion-proof column. Each of the first limit blocks can abut against the bottom surface of each of the first limit grooves one by one, and a fracture inducing groove is provided between each of the first limit blocks and the explosion-proof column. The fixing unit includes a pressure plate detachably connected to the pump casing, and the pressure plate can press and fix the fixing block on the pump casing. The explosion-proof column can be detached from each of the first limit blocks and come out of the outer sleeve when the pressure in the pump casing is greater than the pressure threshold.

[0010] Furthermore, a plurality of grooves are provided on the outer circumference of the outer sleeve, and the cross-section of each groove perpendicular to the circumference of the outer sleeve is dovetail-shaped, and each groove is arranged at intervals along the axial direction of the outer sleeve; a sealing ring is respectively sleeved on the bottom surface of each groove.

[0011] Furthermore, the fixing blocks are two arranged on two opposite sides of the outer sleeve, the fixing unit includes two mounting grooves arranged on the pump casing, the pressure plate can be fixedly connected to the pump casing and press and fix the two fixing blocks in the corresponding mounting grooves.

[0012] Furthermore, the two fixing blocks are respectively provided with threaded holes, and the threaded holes penetrate the fixing blocks along the axial direction of the outer sleeve.

[0013] Furthermore, the inner hole of the outer sleeve is tapered, and the cross-section of the inner hole of the outer sleeve gradually increases along the direction from the inner end surface to the outer end surface of the outer sleeve; the explosion-proof column is a cone that matches the inner hole of the outer sleeve, and the explosion-proof column includes a column top section and a column bottom section connected in series, each of the first limit blocks is respectively arranged on the column bottom section, and a first connecting part is provided on the top end surface of the column bottom section, and a second connecting part that can be connected to the first connecting part is provided on the column top section.

[0014] Furthermore, the first connecting part is a connecting rod fixedly mounted on the top end surface of the column bottom section, the second connecting part includes a through hole passing through the column top section, an external thread is provided on the outer periphery of the connecting rod, the connecting rod can pass through the through hole and be screwed to a nut to form a connection between the column bottom section and the column top section.

[0015] Furthermore, a first sealing sleeve is provided between the top section of the column and the inner hole of the outer sleeve; a second sealing sleeve is provided between the bottom section of the column and the inner hole of the outer sleeve, and a clamping piece is detachably connected to the outer sleeve, and the clamping piece includes a pressure ring that can be detachably connected to the outer sleeve, and a push ring fixed on the end face of the pressure ring and capable of pushing the second sealing sleeve.

[0016] Furthermore, a plurality of second limiting grooves are provided on the inner wall of the outer sleeve, and the second limiting grooves and the first limiting grooves are alternately arranged along the circumference of the outer sleeve, and the bottom surface of the second limiting grooves is higher than the bottom surface of the first limiting grooves; a plurality of second limiting blocks are also provided on the outer periphery of the explosion-proof column, and when the first limiting blocks abut against the bottom surface of the corresponding first limiting groove, a gap is left between the bottom surface of the second limiting block and the bottom surface of the corresponding second limiting groove.

[0017] Furthermore, when each of the first limiting blocks abuts against the bottom surface of the corresponding first limiting groove, the interval between the second limiting block and the bottom surface of the second limiting groove is between 0.5 and 0.8 mm.

[0018] Furthermore, an indicator is provided on the outer sleeve, and the indicator is blocked on the path of the explosion-proof column escaping from the outer sleeve; when the explosion-proof column moves to make each second limit block abut against the bottom surface of the corresponding second limit groove, the top surface of the explosion-proof column abuts against the indicator.

[0019] The working principle and beneficial effects of the present invention are:

[0020] The explosion-proof slurry pump with a pressure relief structure provided by the present invention is provided with an outer sleeve inserted on the pump casing, and an explosion-proof column inserted in the outer sleeve. On the one hand, the explosion-proof column can be disengaged from the outer sleeve when the pressure in the pump body is too large, and a pressure relief channel is formed by the inner hole of the outer sleeve to relieve the pressure of the slurry pump. When the fault is eliminated, the outer sleeve with the explosion-proof column can be reinstalled from the outside of the pump casing without disassembling the slurry pump, which is more convenient to use. On the other hand, in the prior art, the explosion-proof column is directly inserted on the pump casing. Since the explosion-proof column is relatively unstable due to the resistance from the pump casing, the disengagement pressure of the explosion-proof column is also unstable. In the solution of the present invention, by making the explosion-proof column disengage from the outer sleeve, the product can be more standardized, and the disengagement pressure of the explosion-proof column is relatively stable, so that the explosion-proof slurry pump with a pressure relief structure of the present invention is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Figure 1 An exploded view of an explosion-proof slurry pump with a pressure relief structure provided by an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0024] Figure 3 A cross-sectional view of the pressure relief assembly provided by an embodiment of the present invention in cooperation with a slurry pump;

[0025] Figure 4 An exploded view of a pressure relief assembly provided in an embodiment of the present invention;

[0026] Figure 5 An exploded view of a pressure relief assembly provided by an embodiment of the present invention from another angle;

[0027] Figure 6 for Figure 4 A partial enlarged view of point B in the middle;

[0028] Figure 7 A cross-sectional view of a pressure relief assembly provided in an embodiment of the present invention.

[0029] In the figure: 100, pump casing; 101, first pressure relief hole; 102, mounting groove; 200, sleeve; 201, second pressure relief hole; 300, pressure relief assembly; 310, outer sleeve; 311, fixing block; 320, explosion-proof column; 321, column bottom section; 322, column top section; 323, connecting rod, 330, first limiting block; 340, second limiting block; 350, nut; 301, first limiting groove; 302, second limiting groove; 303, fracture inducing groove; 304, through hole; 305, groove; 306, threaded hole; 400, fixing unit; 510, first sealing sleeve; 520, second sealing sleeve; 530, clamping member; 531, pressure ring; 532, push ring; 600, indicator; 700, sealing ring. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] This embodiment provides an explosion-proof slurry pump with a pressure relief structure, which will be referred to as a slurry pump in the following. Figures 1 to 3 As shown, it includes a pump housing 100 and a sleeve 200 arranged in the pump housing 100 . The pump housing 100 is provided with a first pressure relief hole 101 , and the sleeve 200 is provided with a second pressure relief hole 201 opposite to the first pressure relief hole 101 .

[0032] refer to Figures 2 to 5 As shown, the slurry pump of this embodiment also includes a pressure relief assembly 300, which includes an outer sleeve 310, an explosion-proof column 320 and a fixing unit 400. The outer sleeve 310 is inserted into the first pressure relief hole 101 and the second pressure relief hole 201, and a fixing block 311 located outside the pump housing 100 is provided on the outer periphery of the outer sleeve 310, and a plurality of first limiting grooves 301 are provided on the inner wall of the outer sleeve 310, and each first limiting groove 301 is evenly and spaced around the circumference of the outer sleeve 310 and extends outward from the inner end surface of the outer sleeve 310. The inner end surface of the outer sleeve 310 refers to the end surface of the outer sleeve 310 extending into the slurry pump.

[0033] refer to Figures 3 to 7 As shown, the explosion-proof column 320 of this embodiment is inserted into the outer sleeve 310, and a plurality of first limit blocks 330 are provided on the outer circumference of the explosion-proof column 320, each first limit block 330 can be in one-to-one correspondence with the bottom surface of each first limit groove 301, and a fracture induction groove 303 is provided between each first limit block 330 and the explosion-proof column 320. The fixing unit 400 of this embodiment is a pressure plate detachably connected to the pump housing 100, and the pressure plate can press and fix the fixing block 311 on the pump housing 100.

[0034] Based on the above-mentioned overall structure, the explosion-proof column 320 of this embodiment can disengage from each first limit block 330 and escape from the outer sleeve 310 when the pressure in the slurry pump is greater than the pressure threshold. The inner hole of the outer sleeve 310 forms a pressure relief channel to reduce the pressure in the slurry pump, thereby reducing the risk of the slurry pump exploding due to excessive internal pressure.

[0035] In the prior art, the explosion-proof rod is directly disengaged from the mounting hole on the pump casing to form a pressure relief channel, which has the following disadvantages: on the one hand, after the explosion-proof rod is disengaged from the mounting hole for pressure relief, when it needs to be reinstalled, the slurry pump needs to be disassembled as a whole to reinstall the explosion-proof rod, which is inconvenient; on the other hand, the friction between the explosion-proof rod and the mounting hole is unstable, resulting in unstable disengagement pressure of the explosion-proof rod; on the other hand, the outflow of slurry from the mounting hole will also wear the mounting hole, and the mounting hole needs to be re-trimmed before installing the explosion-proof rod, which further causes inconvenience in use.

[0036] In comparison, the explosion-proof column 320 of the present embodiment is disengaged from the outer sleeve 310 fixed on the pump casing 100 to relieve pressure. On the one hand, the outer sleeve 310 can be inserted into the pump casing 100 from the outside. Therefore, after the pressure relief is caused by reasons other than the slurry pump, the slurry pump can be reinstalled without disassembling it. On the other hand, the explosion-proof column 320 and the outer sleeve 310 can be produced in a standardized manner, and the friction between the explosion-proof column 320 and the outer sleeve 310 is relatively stable, so that the disengagement pressure of the explosion-proof column 320 is relatively stable. On the other hand, when the pressure is relieved, the slurry flows out from the inner hole of the outer sleeve 310, and the outer sleeve 310 is directly replaced without the need to trim the slurry pump, which is convenient to use.

[0037] For specific structure, refer to Figure 3 and Figure 7 As shown, in this embodiment, the inner hole of the outer sleeve 310 is tapered, and along the direction from the inner end surface to the outer end surface of the outer sleeve 310, the cross section of the inner hole of the outer sleeve 310 gradually increases, that is, the large diameter end of the inner hole of the outer sleeve 310 is outside the pump housing 100, and the small diameter end is inside the pump housing 100. The explosion-proof column 320 of this embodiment is a cone that matches the outer sleeve 310. And the explosion-proof column 320 of this embodiment includes a column top section 322 and a column bottom section 321 connected in series, each first limit block 330 is respectively arranged on the column bottom section 321, each fixed block 311 is respectively arranged on the column top section 322, and a first connecting portion is provided on the top surface of the column bottom section 321, and a second connecting portion that can be connected to the first connecting portion is provided on the column top section 322.

[0038] In this embodiment, by setting the inner hole of the outer sleeve 310 and the explosion-proof column 320 to be conical, after the first limit blocks 330 on the explosion-proof column 320 break, the explosion-proof column 320 can be easily removed from the outer sleeve 310 to form a pressure relief channel, thereby reducing the risk of the explosion-proof column 320 being stuck in the outer sleeve 310 and unable to remove.

[0039] By configuring the explosion-proof column 320 to include a column top section 322 and a column bottom section 321 connected in series, it is more convenient to install the explosion-proof column 320 in the outer sleeve 310. Specifically, since each first stop block 330 needs to abut against the bottom surface of each first stop groove 301, when installing the explosion-proof column 320, the explosion-proof column 320 needs to be inserted into the outer sleeve 310 from one end inside the outer sleeve 310. However, since the inner hole of the outer sleeve 310 and the explosion-proof column 320 are both tapered, the explosion-proof column 320 cannot be inserted into the outer sleeve 310 from one end inside the outer sleeve 310.

[0040] In order to solve this problem, in this embodiment, the explosion-proof column 320 is configured to include a column top section 322 and a column bottom section 321. Among them, each first stop block 330 is arranged on the column bottom section 321, and the column bottom section 321 can be inserted into the outer sleeve 310 from the inner end of the outer sleeve 310, so that the first stop block 330 can abut against the bottom surface of the first stop groove 301. After the column top section 322 is inserted into the outer sleeve 310 from the outer end of the outer sleeve 310, the column bottom section 321 and the column top section 322 are connected through the first connecting part and the second connecting part to complete the installation of the explosion-proof column 320 in the outer sleeve 310. It should be noted that although the column bottom section 321 is also conical, its large end is slightly different from the bottom end of the inner hole of the outer sleeve 310, and can be inserted into the outer sleeve 310.

[0041] refer to Figure 4 and Figure 5 As shown, the first connection part of this embodiment is a connection rod 323 fixed on the end surface of the column bottom section 321, and the second connection part includes a through hole 304 penetrating the column top section 322. The outer circumference of the connection rod 323 is provided with an external thread, and the connection rod 323 can pass through the through hole 304 and be screwed with a nut 350 to form a connection between the column bottom section 321 and the column top section 322. In some embodiments, the connection rod 323 and the outer sleeve 310 can also be welded and fixed together.

[0042] In this embodiment, reference Figure 3 and Figure 4 As shown, a first sealing sleeve 510 is provided between the column top section 322 and the inner hole of the outer sleeve 310; and a second sealing sleeve 520 is provided between the column bottom section 321 and the inner hole of the outer sleeve 310, and a clamping piece 530 is provided on the outer sleeve 310, the clamping piece 530 includes a pressing ring 531 that can be detachably connected to the outer sleeve 310, and a push ring 532 that is fixed on the end face of the pressing ring 531 and can push the second sealing sleeve 520.

[0043] In this embodiment, since the column top section 322 is tapered, it can exert downward pressure on the first sealing sleeve 510 when it is inserted downward into the outer sleeve 310, which can prevent the first sealing sleeve 510 from coming out, thereby ensuring the seal between the column top section 322 and the outer sleeve 310. By providing the pressing member 530 and the second sealing sleeve 520, when the pressure ring 531 is connected to the outer sleeve 310, the push ring 532 can push the second sealing sleeve 520, thereby ensuring the seal between the column bottom section 321 and the outer sleeve 310. That is, by providing the above-mentioned first sealing sleeve 510 and the second sealing sleeve 520, the seal between the explosion-proof column 320 and the outer sleeve 310 can be ensured as a whole.

[0044] refer to Figure 5As shown, in this embodiment, a plurality of second limiting grooves 302 are further provided on the inner wall of the outer sleeve 310, and each second limiting groove 302 and each first limiting groove 301 are alternately arranged along the circumference of the outer sleeve 310, and the bottom surface of each second limiting groove 302 is higher than the bottom surface of each second limiting groove 302, or in other words, the distance between the bottom surface of the second limiting groove 302 and the inner end surface of the outer sleeve 310 is greater than the distance between the bottom surface of the first limiting groove 301 and the inner end surface of the outer sleeve 310. Figure 4 and Figure 5 As shown, a plurality of second limit blocks 340 are further provided on the outer periphery of the explosion-proof column 320 , and when the bottom surface of each first limit block 330 abuts against the bottom surface of the corresponding first limit groove 301 , a gap is left between each second limit block 340 and the bottom surface of the corresponding second limit groove 302 .

[0045] In this embodiment, by providing the above-mentioned second limiting grooves 302 and second limiting blocks 340, the service life of the pressure relief assembly 300 can be extended. Specifically, the pressure in the slurry pump is changing, that is, the pressure on the first limiting block 330 will also change. If only the first limiting blocks 330 and the corresponding first limiting grooves 301 are provided, the first limiting blocks 330 may have a breaking pressure less than the design pressure after working for a period of time due to the change in force, or may break due to reaching fatigue life, causing the explosion-proof column 320 to accidentally fall out, affecting the normal operation of the slurry pump.

[0046] By setting the above-mentioned second limit blocks 340 and the corresponding second limit grooves 302, before the second limit blocks 340 contact the bottom surface of each second limit groove 302, each second limit block 340 will not be affected by the force change of the explosion-proof column 320. Moreover, after the pressure in the slurry pump is greater than the pressure threshold, when the first limit block 330 breaks, each second limit block 340 can also break, which does not affect the escape of the explosion-proof column 320; when each first limit block 330 reaches the fatigue life, the second limit block 340 can contact the bottom surface of the corresponding second limit groove 302, so that the pressure relief assembly 300 can continue to work normally, thereby extending the service life of the pressure relief assembly 300.

[0047] In this embodiment, when each first limiting block 330 abuts against the bottom surface of the corresponding first limiting groove 301, the distance between the second limiting block 340 and the bottom surface of the second limiting groove 302 is between 0.5 mm and 0.8 mm. The distance is, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or other values ​​between 0.5 and 0.8 mm.

[0048] When the above-mentioned interval is small, the first limit block 330 may cause the second limit block 340 to contact the bottom surface of the second limit groove 302 when it is deformed, which also affects the service life of the second limit block 340; when the above-mentioned interval is large, when the explosion-proof column 320 moves to make each second limit block 340 abut against the bottom surface of the corresponding second limit groove 302, it will affect the seal between the explosion-proof column 320 and the outer sleeve 310.

[0049] In this embodiment, reference Figure 2 As shown, an indicator 600 is provided on the pressure plate, and the indicator 600 is blocked on the path of the explosion-proof column 320 escaping from the outer sleeve 310; when the explosion-proof column 320 moves to make the second limit block 340 contact the bottom surface of the corresponding second limit groove 302, the top surface of the explosion-proof column 320 abuts against the indicator 600.

[0050] Based on the above structure, when there is a gap between the top surface of the explosion-proof column 320 and the indicator 600, it means that the first limit block 330 is in contact with the bottom surface of the first limit groove 301; when the top surface of the explosion-proof column 320 is in contact with the indicator 600, it means that the second limit block 340 is in contact with the bottom surface of the second limit groove 302, and the first limit block 330 has failed; when the top surface of the explosion-proof column 320 pushes the indicator 600 away, it means that the second limit block 340 has also failed. Therefore, by setting the above indicator 600, the state of the explosion-proof column 320 can be understood by observing the relative position of the explosion-proof column 320 and the indicator 600 outside the pump housing 100, and the entire pressure relief assembly 300 can be replaced after the second limit block 340 fails.

[0051] refer to Figure 2 As shown, the indicator 600 of this embodiment is a metal sheet arranged on the pressure plate. Obviously, the indicator 600 can also be other components that can display the position of the explosion-proof column 320 relative to the pump housing 100.

[0052] In this embodiment, reference Figure 7 As shown, a plurality of grooves 305 are provided on the outer circumference of the outer sleeve 310 , and the cross-section of each groove 305 perpendicular to the circumference of the outer sleeve 310 is dovetail-shaped, and each groove 305 is arranged at intervals along the axial direction of the outer sleeve 310 , and a sealing ring 700 is respectively sleeved on the bottom surface of each groove 305 .

[0053] In this embodiment, by providing the above-mentioned dovetail-shaped grooves 305, when the outer sleeve 310 is inserted into the first pressure relief hole 101 and the second pressure relief hole 201, the sealing ring 700 can be driven to move toward the first pressure relief hole 101 and the second pressure relief hole 201 to form a seal between the outer sleeve 310 and the pump housing 100. When the outer sleeve 310 is pulled out of the first pressure relief hole 101 and the second pressure relief hole 201, the sealing ring 700 can also be driven to move outward, so that the sealing ring 700 moves out with the outer sleeve 310.

[0054] refer to Figure 2 and Figure 4 As shown, the fixing blocks 311 of this embodiment are two arranged on two opposite sides of the outer sleeve 310, and the fixing unit 400 includes two mounting grooves 102 arranged on the pump housing 100 and capable of correspondingly accommodating the two fixing blocks 311. The pressure plate can be fixedly connected to the pump housing 100 and press and fix the two fixing blocks 311 in the corresponding mounting grooves 102 to fix the outer sleeve 310 to the pump body to prevent the outer sleeve 310 from moving.

[0055] In this embodiment, reference Figure 7 As shown, each fixing block 311 is provided with a threaded hole 306, and the threaded hole 306 penetrates the fixing block 311 along the axial direction of the outer sleeve 310. By providing the two threaded holes 306, when the explosion-proof column 320 is dislodged and the pressure relief assembly 300 needs to be replaced, the outer sleeve 310 can be pushed out by installing screws in the two threaded holes 306 respectively and rotating the two screws alternately for replacement.

[0056] Based on the above overall structure, the working principle of the explosion-proof slurry pump with a pressure relief structure in this embodiment is:

[0057] Under normal circumstances, the outer sleeve 310 seals the first pressure relief hole 101 and the second pressure relief hole 201, and the explosion-proof column 320 seals the inner hole of the outer sleeve 310, which does not affect the normal operation of the lower slurry pump;

[0058] After the pressure in the slurry pump increases abnormally, the first limit block 330 and the second limit block 340 break off from the explosion-proof column 320, and the explosion-proof column 320 escapes from the outer sleeve 310. The inner hole of the outer sleeve 310 forms a pressure relief channel to reduce the pressure in the slurry pump and avoid explosion of the slurry pump.

[0059] During routine maintenance, it is necessary to observe the relative position relationship between the top surface of the explosion-proof column 320 and the indicator 600. When the explosion-proof column 320 breaks through the indicator 600, a new pressure relief assembly 300 needs to be replaced.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof slurry pump with a pressure relief structure, comprising a pump housing (100) and a sleeve (200) arranged in the pump housing (100), the pump housing (100) being provided with a first pressure relief hole (101), and the sleeve (200) being provided with a second pressure relief hole (201) opposite to the first pressure relief hole (101), characterized in that: The pump also comprises a pressure relief assembly (300), the pressure relief assembly (300) comprising an outer sleeve (310), an explosion-proof column (320) and a fixing unit (400), the outer sleeve (310) being inserted into the first pressure relief hole (101) and the second pressure relief hole (201), the explosion-proof column (320) being inserted into the outer sleeve (310), a fixing block (311) located outside the pump housing (100) being provided on the outer circumference of the outer sleeve (310), a plurality of first limiting grooves (301) being provided on the inner wall of the outer sleeve (310), the first limiting grooves (301) being uniformly arranged and spaced around the circumference of the outer sleeve (310), and extending outward from the inner end surface of the outer sleeve (310), A plurality of first limit blocks (330) are provided on the outer circumference of the explosion-proof column (320), each of the first limit blocks (330) being capable of abutting against the bottom surface of each of the first limit grooves (301) in a one-to-one correspondence, and a fracture inducing groove (303) is respectively provided between each of the first limit blocks (330) and the explosion-proof column (320); the fixing unit (400) comprises a pressing plate detachably connected to the pump housing (100), the pressing plate being capable of pressing and fixing the fixing block (311) on the pump housing (100); the explosion-proof column (320) being capable of detaching from each of the first limit blocks (330) and escaping from the outer sleeve (310) when the pressure in the pump housing (100) is greater than a pressure threshold; The inner hole of the outer sleeve (310) is tapered, and along the direction from the inner end surface to the outer end surface of the outer sleeve (310), the cross-section of the inner hole of the outer sleeve (310) gradually increases. The explosion-proof column (320) is tapered to match the inner hole of the outer sleeve (310), and the explosion-proof column (320) comprises a column top section (322) and a column bottom section (321) connected in series. Each of the first limit blocks (330) is respectively arranged on the column bottom section (321), and a first connecting portion is arranged on the top end surface of the column bottom section (321), and a second connecting portion capable of being connected to the first connecting portion is arranged on the column top section (322).

2. The explosion-proof slurry pump with a pressure relief structure according to claim 1, characterized in that: A plurality of grooves (305) are provided on the outer circumference of the outer sleeve (310); the cross-section of each groove (305) perpendicular to the circumference of the outer sleeve (310) is dovetail-shaped, and each groove (305) is arranged at intervals along the axial direction of the outer sleeve (310); and a sealing ring (700) is respectively sleeved on the bottom surface of each groove (305).

3. The explosion-proof slurry pump with a pressure relief structure according to claim 1, characterized in that: The fixing blocks (311) are two fixed blocks arranged on two opposite sides of the outer sleeve (310), the fixing unit (400) includes two mounting grooves (102) arranged on the pump housing (100), and the pressure plate can be fixedly connected to the pump housing (100) and press the two fixing blocks (311) into the corresponding mounting grooves (102).

4. The explosion-proof slurry pump with a pressure relief structure according to claim 3, characterized in that: The two fixing blocks (311) are respectively provided with threaded holes (306), and the threaded holes (306) penetrate the fixing blocks (311) along the axial direction of the outer sleeve (310).

5. The explosion-proof slurry pump with a pressure relief structure according to claim 1, characterized in that: The first connecting portion is a connecting rod (323) fixedly mounted on the top end surface of the column bottom section (321); the second connecting portion includes a through hole (304) penetrating the column top section (322); an external thread is provided on the outer periphery of the connecting rod (323); the connecting rod (323) can pass through the through hole (304) and be screwed to a nut (350) to form a connection between the column bottom section (321) and the column top section (322).

6. The explosion-proof slurry pump with a pressure relief structure according to claim 1, characterized in that: A first sealing sleeve (510) is provided between the column top section (322) and the inner hole of the outer sleeve (310); a second sealing sleeve (520) is provided between the column bottom section (321) and the inner hole of the outer sleeve (310); a pressing member (530) is detachably connected to the outer sleeve (310); the pressing member (530) comprises a pressing ring (531) detachably connected to the outer sleeve (310), and a pushing ring (532) fixed on the end surface of the pressing ring (531) and capable of pushing the second sealing sleeve (520).

7. The explosion-proof slurry pump with a pressure relief structure according to any one of claims 1 to 6, characterized in that: A plurality of second limiting grooves (302) are provided on the inner wall of the outer sleeve (310), and the second limiting grooves (302) and the first limiting grooves (301) are arranged alternately along the circumference of the outer sleeve (310), and the bottom surface of each second limiting groove (302) is higher than the bottom surface of each first limiting groove (301); a plurality of second limiting blocks (340) are also provided on the outer circumference of the explosion-proof column (320), and when each first limiting block (330) abuts against the bottom surface of the corresponding first limiting groove (301), a gap is left between the bottom surface of each second limiting block (340) and the bottom surface of the corresponding second limiting groove (302).

8. The explosion-proof slurry pump with a pressure relief structure according to claim 7, characterized in that: When each of the first limiting blocks (330) abuts against the bottom surface of the corresponding first limiting groove (301), the interval between the second limiting block (340) and the bottom surface of the second limiting groove (302) is between 0.5 and 0.8 mm.

9. The explosion-proof slurry pump with a pressure relief structure according to claim 7, characterized in that: An indicator (600) is provided on the outer sleeve (310), and the indicator (600) is placed on a path for the explosion-proof column (320) to escape from the outer sleeve (310); when the explosion-proof column (320) moves to make each second limiting block (340) abut against the bottom surface of the corresponding second limiting groove (302), the top surface of the explosion-proof column (320) abuts against the indicator (600).

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