Single shell gravel pump

Abstract

The present invention belongs to the technical field of pump industry, specifically a single-shell gravel pump, including a bearing assembly, a bracket is installed on the bearing assembly, a rotating shaft is installed in the bearing assembly, a rear pump cover is installed on the rotating shaft, and the rear pump cover is connected to the bracket through a mounting column; a pump casing is installed on the rear pump cover, and a front pump cover is installed on the pump casing; further comprising: a fixing assembly, the fixing assembly is used to connect the rear pump cover and the pump casing, and the pump casing and the front pump cover; the present invention has a simple structure, can shorten the time spent on disassembly and maintenance of the gravel pump, is convenient for disassembly and installation, and reduces the labor intensity of the staff.

Description

Technical Field

[0001] The invention belongs to the technical field of pump industry, in particular to a single-shell gravel pump. Background Art

[0002] Gravel pumps are widely used in the production of metallurgy, mining, coal, sand pumping, silt removal and other industries. Common gravel pumps are generally composed of pump casing, impeller, front guard plate, rear guard plate, front cover, rear cover, shaft, bearing seat, transmission wheel, packing gland, seal and other parts. The general sealing method is to use packing or skeleton oil seal. During use, the sand, mortar, pebbles, etc. contained in the liquid transported by the pump will cause serious wear to the sealing parts, which need to be replaced frequently, affecting production efficiency and increasing the cost of use.

[0003] The existing gravel pump is a bolt connection to fix each set of steel plate cassettes. Due to the large number of bolts, the disassembly process is relatively long during maintenance. At the same time, the original bolt connection requires the addition of prefabricated parts when casting high-chromium alloy parts, or the annealing of high-chromium cast iron parts, which complicates the process and increases production costs and labor intensity. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art, shorten the time spent on disassembly and maintenance of a gravel pump, facilitate disassembly and installation, and reduce the labor intensity of workers, the present invention proposes a single-shell gravel pump.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: a single-shell gravel pump according to the present invention comprises a bearing assembly, a bracket is installed on the bearing assembly, a rotating shaft is rotatably installed in the bearing assembly, and two ends of the rotating shaft are respectively connected to a power source and an impeller;

[0006] A rear pump cover is sleeved on one end of the rotating shaft away from the power source, a packing seal (existing technology, not marked in the drawings of the specification) is installed between the rear pump cover and the rotating shaft, a mounting column is arranged on the side of the rear pump cover facing the bracket, and the mounting column and the bracket are connected by mounting bolts; a pump casing is movably mounted on the rear pump cover, the impeller is located inside the pump casing, and an auxiliary impeller (existing technology, not marked in the drawings of the specification) is arranged on the side of the impeller facing the rear pump cover to achieve the auxiliary impeller sealing effect, a front pump cover is movably mounted on the pump casing, and the front pump cover and the rear pump cover are symmetrical with each other in terms of installation position;

[0007] It also includes: a fixing assembly, the fixing assembly is used to connect the rear pump cover and the pump housing, the fixing assembly is used to connect the pump housing and the front pump cover; the fixing assembly structures at the rear pump cover and the front pump cover are the same;

[0008] The front pump cover is provided with a front flange, the pump cover is provided with a pump cover flange, the pump cover flange and the front flange are directly opposite to each other, and the pump cover flanges are symmetrically distributed on the pump cover;

[0009] The fixed component includes a limit plate which is installed on the front flange. The cross-section of the front flange where the limit plate is located is in a "U" shape, and the width of the "U" shape is exactly equal to the sum of the thickness of the pump cover flange and the thickness of the gasket.

[0010] A fixing hole is provided at a position symmetric to the limit plate on the front flange. The edge of the pump cover flange is inserted into the "U" shape formed by the front flange and the limit plate, and a fixing bolt is installed at the fixing hole. The fixing bolt connects the front flange and the pump cover flange. Similarly, a rear flange is provided on the rear pump cover. The rear flange and the pump cover flange face each other. A limit plate is installed on the rear flange. The edge of the pump cover flange is inserted into the "U" shape formed by the rear flange and the limit plate, and a fixing bolt is installed at the fixing hole. The fixing bolt connects the rear flange and the pump cover flange.

[0011] Preferably, the fixed component further includes: a sealing ring made of water-absorbing and expanding rubber.

[0012] Preferably, a cavity is provided inside the sealing ring, and the outer side surface of the sealing ring is in contact with the external environment.

[0013] Preferably, a through hole is provided on the sealing ring. The through hole communicates the cavity with the external environment, and a plug is installed in the through hole.

[0014] Preferably, the plug is in a stepped shape, and the diameter of the end of the plug facing the cavity is larger.

[0015] The hardness of the plug is greater than the hardness of the sealing ring.

[0016] Preferably, protrusions are provided on the surface of the sealing ring. There are multiple groups of the protrusions, and the protrusions are distributed in concentric circles. The protrusions contact the pump housing flange and the front flange.

[0017] Preferably, the fixed component further includes:

[0018] a retaining ring which is installed on the opposite side surfaces of the pump housing flange and the front flange, and the retaining ring contacts the outer side surface of the sealing ring that has expanded.

[0019] Preferably, installation grooves are provided on the pump housing flange and the front pump cover. The two installation grooves are mirror images of each other. The sealing ring is located in the installation grooves, and the sealing ring has magnetism.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The single-shell gravel pump described in the present invention, by setting a limit plate, does not need to be connected using a steel plate tape while ensuring a good fixing effect of the gravel pump, so that there is no need to remove a large number of bolts during disassembly, which effectively shortens the disassembly time during maintenance, facilitates disassembly and installation, and reduces the labor intensity of the staff.

[0022] 2. The single-shell gravel pump described in the present invention can ensure the sealing effect of the gravel pump while facilitating disassembly and installation by providing a sealing ring, thereby avoiding leakage during operation of the gravel pump and affecting the normal use of the gravel pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 is a front view of the gravel pump of the present invention;

[0025] Figure 2 is a partial cross-sectional view of a gravel pump;

[0026] Figure 3 yes Figure 2 A partial enlarged view of the middle part;

[0027] Figure 4 yes Figure 2 A partial enlarged view of point B in the middle;

[0028] Figure 5 yes Figure 3 A partial enlarged view of point C in the middle;

[0029] In the figure: bearing assembly 1, bracket 11, rotating shaft 12, pump casing 2, fixing hole 21, impeller 22, pump casing flange 23, rear pump cover 3, mounting column 31, mounting bolt 311, rear flange 32, front pump cover 4, front flange 41, limit plate 5, fixing bolt 51, retaining ring 6, mounting groove 61, sealing ring 7, cavity 71, protrusion 72, plug 73. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0031] like Figures 1 to 5 As shown, a single-shell gravel pump according to the present invention comprises a bearing assembly 1, a bracket 11 is mounted on the bearing assembly 1, a rotating shaft 12 is rotatably mounted in the bearing assembly 1, and two ends of the rotating shaft 12 are respectively connected to a power source and an impeller 22;

[0032] One end of the rotating shaft 12 away from the power source is sleeved with a rear pump cover 3. A stuffing box seal (prior art, not marked in the attached drawings of the specification) is installed between the rear pump cover 3 and the rotating shaft 12. An installation post 31 is arranged on the side of the rear pump cover 3 facing the bracket 11, and the installation post 31 is connected to the bracket 11 through an installation bolt 311. A pump housing 2 is movably installed on the rear pump cover 3. An impeller 22 is located inside the pump housing 2. A secondary impeller 22 (prior art, not marked in the attached drawings of the specification) is arranged on the side of the impeller 22 facing the rear pump cover 3 to achieve the sealing effect of the secondary impeller 22. A front pump cover 4 is movably installed on the pump housing 2, and the front pump cover 4 and the rear pump cover 3 are symmetrically arranged in the installation position.

[0033] It further includes: a fixing component, which is used to connect the rear pump cover 3 and the pump housing 2, and the fixing component is used to connect the pump housing 2 and the front pump cover 4; the fixing component structures at the rear pump cover 3 and the front pump cover 4 are the same.

[0034] A front flange 41 is installed on the front pump cover 4. A pump cover flange is installed on the pump cover. The pump cover flange and the front flange 41 face each other, and the pump cover flanges are symmetrically distributed on the pump cover.

[0035] The fixing component includes a limiting plate 5, which is installed on the front flange 41. The cross-section of the front flange 41 at the position where the limiting plate 5 is located is in a "U" shape, and the width of the "U" shape is exactly equal to the sum of the thickness of the pump cover flange and the thickness of the gasket.

[0036] A fixing hole 21 is opened at a position on the front flange 41 symmetrical to the limiting plate 5. The edge of the pump cover flange is inserted into the "U" shape formed by the front flange 41 and the limiting plate 5. A fixing bolt 51 is installed at the fixing hole 21, and the fixing bolt 51 connects the front flange 41 and the pump cover flange. A rear flange 32 is also arranged on the rear pump cover 3. The rear flange 32 and the pump cover flange face each other. A limiting plate 5 is installed on the rear flange 32. The edge of the pump cover flange is inserted into the "U" shape formed by the rear flange 32 and the limiting plate 5. A fixing bolt 51 is installed at the fixing hole 21, and the fixing bolt 51 connects the rear flange 32 and the pump cover flange.

[0037] During use, when the gravel pump needs to be disassembled and maintained, the staff uses tools to remove the fixing bolt 51 of the pump housing 2 facing the front pump cover 4. At the same time, after removing the fixing bolt 51, the staff uses tools or manually moves the front pump cover 4 along the direction pointed by the fixing hole 21 towards the limiting plate 5, so that the pump housing flange 23 leaves the "U" shape formed by the front flange 41 and the limiting plate 5, thereby removing the front pump cover 4. After that, in the same way, the fixing screw of the pump housing 2 facing the rear pump cover 3 is removed, and then the pump housing 2 is taken off. After that, the gasket on the pump housing flange 23 is removed to complete the disassembly of the gravel pump, which is convenient for the staff to carry out subsequent maintenance of the gravel pump and ensure the normal operation of the gravel pump;

[0038] At the same time, when maintaining the gravel pump, the staff only needs to simply remove two fixing bolts 51 to disassemble the gravel pump, without the need to use steel plate straps for connection, so that a large number of bolts need to be disassembled during disassembly, effectively shortening the disassembly time during maintenance. At the same time, through the structure of the limiting plate 5 provided, the pump housing 2, the front pump cover 4 and the rear pump cover 3 of the gravel pump are limited and fixed, and bear the main force during the operation of the gravel pump, sharing / reducing the stress on the fixing bolt 51 for fixing, avoiding damage to the fixing bolt 51 due to excessive stress during the operation of the gravel pump, which may cause leakage or abnormal operation of the gravel pump. At the same time, the structure of the limiting plate 5, the fixing hole 21 and the fixing bolt 51 is simpler than the structure of the steel plate strap and the card head, the production process is relatively simple, reducing the production cost. At the same time, during the disassembly and installation process, if the staff installs in the order of the rear pump cover 3, the pump housing 2, and the front pump cover 4, the limiting and bearing functions of the limiting plate 5 on the pump housing 2 and the front pump cover 4 can be utilized, so that during the installation process, the staff does not need to spend more energy to position the pump housing 2 and the front pump cover 4 and keep their positions unchanged after positioning. Furthermore, it is convenient for the staff to fix them with the fixing bolt 51, so that the gravel pump can be quickly disassembled and installed, facilitating maintenance and reducing labor intensity.

[0039] As an implementation mode of the present invention, the fixing component further includes:

[0040] A sealing ring 7, which is made of water-absorbing and expanding rubber;

[0041] During the installation process, the sealing ring 7 does not absorb moisture, and the thickness of the sealing ring 7 is relatively thin. Thus, the sum of the thickness of the sealing ring 7 and the thickness of the pump housing flange 23 is exactly equal to or less than the width of the "U" shape formed by the front flange 41 and the limiting plate 5. There will be no situation where the pump housing flange 23 cannot be inserted into the "U" shape, resulting in difficulties in the installation process. At the same time, when the seal between the pump housing flange 23 and the front flange 41 is good, no liquid will leak out during the operation of the gravel pump. Thus, the sealing ring 7 only plays a simple role of sealing and buffering. When there is a gap between the pump housing flange 23 and the front flange 41, causing liquid leakage during the operation of the gravel pump, the leaked liquid contacts the sealing ring 7 and is absorbed by the sealing ring 7. As a result, the sealing ring 7 expands, and then seals the gap between the pump housing flange 23 and the front flange 41, preventing further liquid leakage and ensuring the normal operation of the gravel pump. At the same time, after the sealing ring 7 expands, the sealing ring 7 will generate a relatively large contact pressure on the pump housing flange 23 and the front flange 41, causing the two to be subjected to opposite-direction pressures. Thus, the positions of the pump housing 2 and the front pump cover 4 are relatively fixed, preventing minor vibrations between the two from causing the fixing bolts 51 to loosen and affecting the normal operation of the gravel pump. At the same time, by utilizing the characteristic that the sealing ring 7 will expand, during the disassembly and installation process, a sealing ring 7 with a relatively small thickness is used, making the sum of the thickness of the sealing ring 7 and the pump housing flange 23 relatively small, further facilitating the installation by the staff, reducing the labor intensity, and being beneficial for maintenance.

[0042] As an implementation manner of the present invention, a cavity 71 is provided inside the sealing ring 7, and the outer side surface of the sealing ring 7 is in contact with the external environment;

[0043] By providing the cavity 71 inside the sealing ring 7, after the sealing ring 7 expands, the sealing ring 7 will squeeze the cavity 71, improving the elasticity of the sealing ring 7, enabling the sealing ring 7 to fully fill the gap. At the same time, after the elasticity of the sealing ring 7 is improved through the cavity 71, during installation, the staff can make the sealing ring 7 deform with a relatively small force, thus facilitating the installation of the gravel pump. At the same time, during disassembly, the staff uses a needle or a thorn to pierce through the sealing ring 7, releasing the pressure inside the cavity 71, which can reduce the volume of the sealing ring 7 after expansion, thereby reducing the contact pressure generated by the sealing ring 7 on the pump housing flange 23 and the front flange 41, facilitating the disassembly by the staff, so as to avoid excessive contact pressure, where the staff cannot easily disassemble the fixing bolts 51 or the front pump cover 4 pops out after disassembling the fixing bolts 51, causing damage or injury.

[0044] As an implementation manner of the present invention, through holes are provided on the sealing ring 7, the through holes communicate the cavity 71 with the external environment, and a plug 73 is installed in the through holes;

[0045] During installation, the staff removes the plug 73 from the sealing ring 7, so that the cavity 71 in the sealing ring 7 is connected with the outside world, so that the sealing ring 7 can be deformed to a certain extent during the installation of the gravel pump, which is convenient for the staff to disassemble and install the gravel pump. At the same time, after the installation is completed, the staff reinstalls the plug 73 on the sealing ring 7 to ensure the normal function of the sealing ring 7.

[0046] As an embodiment of the present invention, the sealing plug 73 is in a step shape, and the end of the sealing plug 73 facing the cavity 71 has a larger diameter;

[0047] The hardness of the sealing plug 73 is greater than the hardness of the sealing ring 7;

[0048] The closure 73 is preferably positioned at the bottom of the closure 73, so that the closure 73 is not easily broken, and the closure 73 is easily deformed.

[0049] As an embodiment of the present invention, the surface of the sealing ring 7 is provided with protrusions 72, and there are a plurality of groups of protrusions 72. The protrusions 72 are distributed in concentric circles, and the protrusions 72 contact the pump casing flange 23 and the front flange 41;

[0050] During use, the protrusions 72 distributed in concentric circles can effectively improve the sealing effect of the sealing ring 7 after and before the sealing ring 7 absorbs water and expands, thereby avoiding leakage of the gravel pump. At the same time, by providing multiple groups of protrusions 72, a multi-stage sealing effect can be produced, further reducing the possibility of leakage. At the same time, after the sealing ring 7 absorbs water and expands, since the volume of the protrusions 72 is relatively small and the amount of water absorbed is also small, the expansion speed is faster, and the leakage can be quickly blocked, thereby reducing the scope and number of leakages before the sealing ring 7 absorbs enough water, expands and fills the gap, thereby reducing losses and the labor intensity of subsequent maintenance staff.

[0051] As an embodiment of the present invention, the fixing assembly further includes:

[0052] A retaining ring 6, the retaining ring 6 is mounted on the side of the pump housing flange 23 opposite to the front flange 41, and the retaining ring 6 contacts the outer side of the sealing ring 7 that expands;

[0053] The retaining ring 6 is provided to block the sealing ring 7 that absorbs water and expands, so as to avoid excessive deformation of the sealing ring 7 in radial direction, thereby reducing the contact pressure of the sealing ring 7 on the pump casing flange 23 and the front flange 41. At the same time, the retaining ring 6 is used to block the sealing ring 7, so as to avoid excessive radial deformation of the sealing ring 7 after expansion, which may cause the sealing ring 7 to rupture and affect the normal use of the sealing ring 7. At the same time, since the sealing ring 7 is located inside the retaining ring 6, during installation, the staff can use the retaining ring 6 to perform preliminary positioning of the sealing ring 7, so that the center line of the sealing ring 7 is in the same straight line with the center line of the rotating shaft 12, so as to avoid different forces between different parts of the sealing ring 7 and the retaining ring 6 after the sealing ring 7 expands, and different forces of different parts of the sealing ring 7 on the front pump cover 4 and the rear pump cover 3, thereby affecting the normal use of the gravel pump.

[0054] As an embodiment of the present invention, the pump housing flange 23 and the front pump cover 4 are provided with mounting grooves 61, the two mounting grooves 61 are mirror images of each other, the sealing ring 7 is located in the mounting grooves 61, and the sealing ring 7 is magnetic;

[0055] During installation, after placing the sealing ring 7 into the installation groove 61, the staff can ensure that the sealing ring 7 is installed at the specified position, thereby facilitating the installation of the sealing ring 7 and reducing the labor intensity of the staff. At the same time, since the sealing ring 7 is magnetic, after the staff places the sealing ring 7 into the installation groove 61, the sealing ring 7 will not fall off or shift due to its own magnetic effect, which further facilitates the staff to disassemble and install the gravel pump during maintenance and reduces the labor intensity of the staff.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A single - shell grit pump, comprising a bearing assembly (1), a bracket (11) is mounted on the bearing assembly (1), a rotating shaft (12) is rotatably mounted inside the bearing assembly (1), and two ends of the rotating shaft (12) are respectively connected to a power source and an impeller (22); One end of the rotating shaft (12) far from the power source is sleeved with a rear pump cover (3). An installation post (31) is arranged on the side surface of the rear pump cover (3) facing the bracket (11), and the installation post (31) and the bracket (11) are connected by an installation bolt (311); A pump shell (2) is movably mounted on the rear pump cover (3), the impeller (22) is located inside the pump shell (2), a front pump cover (4) is movably mounted on the pump shell (2), and the front pump cover (4) and the rear pump cover (3) are symmetrically arranged at the installation positions; It is characterized in that: It further includes: A fixing component, which is used to connect the rear pump cover (3) and the pump shell (2), and is used to connect the pump shell (2) and the front pump cover (4); The fixing component structures at the rear pump cover (3) and the front pump cover (4) are the same; A front flange (41) is mounted on the front pump cover (4), a pump cover flange is mounted on the pump cover, and the pump cover flange and the front flange (41) face each other; The fixing component includes a limit plate (5), the limit plate (5) is mounted on the front flange (41), and the cross - section of the front flange (41) where the limit plate (5) is located is in a "U" shape; A fixing hole (21) is opened at a position on the front flange (41) symmetrical to the limit plate (5). The edge of the pump cover flange is inserted into the "U" shape formed by the front flange (41) and the limit plate (5), and a fixing bolt (51) is installed at the fixing hole (21), and the fixing bolt (51) connects the front flange (41) and the pump cover flange; The fixing component further includes a sealing ring (7), and the sealing ring (7) is made of water - absorbing and expanding rubber; A cavity (71) is opened inside the sealing ring (7), and the outer side surface of the sealing ring (7) is in contact with the external environment; A through - hole is opened on the sealing ring (7), the through - hole communicates the cavity (71) with the external environment, and a plug (73) is installed in the through - hole; The plug (73) is in a stepped shape, and the diameter of the end of the plug (73) facing the cavity (71) is larger; The hardness of the plug (73) is greater than that of the sealing ring (7); Protrusions (72) are arranged on the surface of the sealing ring (7), there are multiple groups of the protrusions (72), the protrusions (72) are distributed in a concentric circular shape, and the protrusions (72) are in contact with the pump shell flange (23) and the front flange (41).

2. The single - shell grit pump according to claim 1, It is characterized in that: The fixing component further includes: A retaining ring (6), the retaining ring (6) is mounted on the side surface of the pump shell flange (23) opposite to the front flange (41), and the retaining ring (6) is in contact with the outer side surface of the sealing ring (7) that has expanded.

3. The single - shell grit pump according to claim 2, It is characterized in that: The pump casing flange (23) and the front pump cover (4) are provided with mounting grooves (61), the two mounting grooves (61) are mirror images of each other, the sealing ring (7) is located in the mounting grooves (61), and the sealing ring (7) is magnetic.

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