Exhaustible single-casing slurry pump casing and slurry pump

Abstract

The utility model provides an exhaustable single-shell slurry pump casing and a slurry pump, which relate to the field of mining equipment; the pump casing comprises a volute and an exhaust unit arranged on the surface of the volute; the exhaust unit comprises an exhaust hole, a blocking structure and a limiting structure; the exhaust hole penetrates the volute shell surface and is connected to the inside of the volute, and one end of the blocking structure is adapted to the exhaust hole; the limiting structure connects the volute and the blocking structure from the outside of the volute, and the limiting structure has at least two states, unlocking and locking, on the volute, and exhausts the gas in the volute when in the unlocked state; when the limiting structure is in the locked state on the volute, the end of the blocking structure is adapted to extend into the exhaust hole, and the blocking structure is sealed and fixed in the exhaust hole; the utility model is an exhaustable single-shell slurry pump casing that can reduce the occurrence of cavitation, gas binding and the like, can effectively increase the service life of the volute, reduce the eccentric force applied to the impeller during operation, and make the slurry pump run more stably.

Description

Technical Field

[0001] The utility model relates to the technical field of mining equipment, in particular to an exhaustable single-casing slurry pump casing and a slurry pump. Background Art

[0002] Slurry pumps are mainly used in mines for conveying mill discharge slurry, cyclone feeding, flotation, and tailings conveying in the mineral processing process of mines. The conveyed slurry contains solid particles, especially for conveying mill discharge slurry. The slurry has the characteristics of large particles and high concentration, and the sleeve life of the slurry pump is short. Wear-resistant high-chromium alloy flow parts can effectively utilize their own strength and wear resistance, and are more erosion-resistant than rubber flow parts; due to their long life cycle and high wear resistance, wear-resistant high-chromium alloy flow parts are widely used.

[0003] In the actual use of slurry pumps, due to factors such as on-site equipment layout and pipeline layout, some slurry pumps need to adopt a lower horizontal outlet layout, that is, the outlet is in a lower horizontal state, which will cause the liquid level inlet height to be higher than the outlet height. Under normal conditions, the air in the slurry pump cavity cannot be completely discharged. The presence of a large amount of air in the pump cavity has the following hazards:

[0004] 1) Cavitation phenomenon: Cavitation occurs when various gases dissolved in the liquid in the pump overflow from the pump liquid to form a gas cavity, which ruptures after reaching the high-pressure area. Cavitation can cause wear and damage to the pump and pipeline, reduce the pump head and flow rate, increase energy consumption, generate vibration and noise, and eventually damage or fail the pump.

[0005] 2) Air binding phenomenon: refers to the phenomenon that gas gathers in the pump cavity to form air pockets. The formation of air pockets will lead to reduced pump efficiency, noise and vibration, and the pump shaft may be strongly squeezed and bent. In severe cases, it may even cause damage to the pump shaft or breakage.

[0006] In view of the above-mentioned hazards caused by the large amount of gas in the volute, there is currently no reliable solution on the market to effectively solve the above problems. Utility Model Content

[0007] The utility model aims to provide an exhaustable single-shell slurry pump casing and a slurry pump, which can overcome the defects of cavitation, air binding, performance degradation and the like caused by air accumulation in the existing volute, and improve the service life of the slurry pump.

[0008] In order to achieve the above purpose, the utility model proposes the following technical solutions:

[0009] In a first aspect, there is provided an exhaustable single-casing slurry pump casing, comprising a volute and an exhaust unit arranged on a surface of the volute;

[0010] The exhaust unit includes an exhaust hole, a sealing structure and a limiting structure; the exhaust hole passes through the shell surface of the volute and is connected to the interior of the volute, and one end of the sealing structure is adapted to the exhaust hole; the limiting structure connects the volute and the sealing structure from the outside of the volute, and the limiting structure has at least two states, unlocked and locked, on the volute; when the limiting structure is in a locked state on the volute, the end of the sealing structure is adapted to extend into the exhaust hole, and the sealing structure is sealed and fixed in the exhaust hole; when the limiting structure is in an unlocked state on the volute, the end of the sealing structure is drawn out of the exhaust hole to exhaust the gas inside the volute.

[0011] Furthermore, the sealing structure is a removable plug, one end of the removable plug is configured to be adapted to the inner wall of the exhaust hole, and the other end is configured to be a cover plate structure; the cover plate structure is covered on the opening end surface of the exhaust hole close to the outer side of the volute, and a positioning portion is provided on the side of the cover plate structure away from the exhaust hole, and the sealing structure is connected to the limiting structure and the volute via the positioning portion.

[0012] Furthermore, the limiting structure includes a limiting portion and a locking portion, and the locking portion is detachably connected to the limiting portion;

[0013] The limiting portion includes two positioning plates symmetrically arranged on both sides of the exhaust hole along the spiral direction of the volute, and the two positioning plates are parallel to each other; the positioning portion is located between the two positioning plates, and the locking portion sequentially connects and fastens the positioning plates and the positioning portion.

[0014] Furthermore, the exhaust hole is set as a cylindrical hole, and the end of the removable plug that cooperates with the inner wall of the cylindrical hole is set as a cylindrical structure; the outer wall of the cylindrical structure is provided with a plurality of sealing parts, which are annular and evenly distributed on the outer wall of the cylindrical structure along the axial direction.

[0015] Furthermore, the exhaust hole is set as a cylindrical hole, and the end of the detachable plug that cooperates with the inner wall of the cylindrical hole is set as a cylindrical structure; a plurality of sealing grooves are arranged around the outer wall of the cylindrical structure, and the sealing grooves are evenly distributed on the outer wall of the cylindrical structure along the axial direction;

[0016] The sealing structure further includes a plurality of O-rings, the number of the O-rings corresponds to the number of the sealing grooves, and the O-rings are adapted to be installed in the sealing grooves.

[0017] Further, the locking portion is a limiting bolt assembly, and the limiting bolt assembly includes a stud, a nut and a flat washer;

[0018] The positioning part is set as a flat plate structure, the flat plate structure is parallel to the positioning plate, and a positioning hole is respectively set at the corresponding positions of the flat plate structure and the two positioning plates; the studs pass through the positioning holes in sequence and then are fitted with the flat washers and the nuts for locking.

[0019] Furthermore, a partial area of ​​the outer surface of the volute between the two positioning plates is set as a plane, and the exhaust hole is set in the area of ​​the plane.

[0020] Furthermore, the limiting portion and the volute are integrally formed.

[0021] Further, when the pump casing of the slurry pump is arranged with a lower horizontal outlet, the exhaust unit is arranged at the highest point of the casing away from the volute outlet.

[0022] In a second aspect, a slurry pump is provided, wherein a pump casing of the slurry pump is the above-mentioned exhaustible single-shell slurry pump casing.

[0023] It can be seen from the above technical solutions that the technical solution of the utility model has the following beneficial effects:

[0024] The utility model discloses an exhaustable single-shell slurry pump casing and a slurry pump, wherein the slurry pump casing comprises a volute and an exhaust unit arranged on the surface of the volute; the exhaust unit comprises an exhaust hole, a blocking structure and a limiting structure; the exhaust hole penetrates the shell surface of the volute and is connected to the inside of the volute, and one end of the blocking structure is adapted to the exhaust hole; the limiting structure connects the volute and the blocking structure from the outside of the volute, and the limiting structure has at least two states on the volute: unlocking and locking; when the limiting structure is in a locked state on the volute, the end of the blocking structure is adapted to extend into the exhaust hole, and the blocking structure is sealed and fixed in the exhaust hole; the utility model provides a detachable exhaust port at the top of the volute, and when the slurry pump is set to a lower horizontal outlet direction, water or other liquids can be injected into the volute to discharge the gas at the top of the pump casing, reduce the accumulation of gas, effectively reduce the harm of cavitation and air binding to the slurry pump, reduce the eccentric force applied to the impeller during operation, effectively improve the stability of the operation of the slurry pump, and improve the service life of the slurry pump.

[0025] The pump casing of the exhaustable single-shell slurry pump of this utility model is optimized from the original pump casing + jacket structure to a single pump casing thickened design. The main material is made of wear-resistant high-chromium alloy steel, which has strong wear resistance. At the same time, a removable plug is designed after the gas is discharged, and the volute is sealed by an O-ring. The removable plug is also made of high-chromium alloy steel, taking into account both strength and wear resistance. The O-ring is made of EPDM rubber, which has good sealing and compressibility. Finally, the limit bolt assembly is inserted and the nut is tightened to prevent the removable plug from moving outward due to outward pressure when the pump is working, affecting the volute seal. The slurry pump casing of this solution can effectively extend the customer's replacement cycle of the flow parts after application. Bolt holes are reserved on both sides of the volute near the center, which makes installation and maintenance more convenient, saving more time for customers.

[0026] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0027] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the teachings of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are not drawn to scale according to actual reference objects. In the accompanying drawings, each identical or approximately identical component shown in each figure may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the utility model will be described by way of example and with reference to the accompanying drawings, in which:

[0029] Figure 1 A schematic diagram of the three-dimensional structure of a slurry pump casing provided by an embodiment of the utility model;

[0030] Figure 2 A front view of a slurry pump casing provided by an embodiment of the utility model;

[0031] Figure 3 for Figure 2 An enlarged schematic diagram of area A in the front view of the slurry pump casing is provided.

[0032] In the figure, the specific meaning of each mark is as follows:

[0033] 1-volute, 2-removable plug, 3-O-ring, 4-hexagonal stud, 5-flat washer, 6-hexagonal nut, 7-limiting part, 8-positioning part. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Unless otherwise defined, the technical terms or scientific terms used herein should be the usual meanings understood by people with general skills in the field to which the utility model belongs.

[0035] The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular form of "a", "an" or "the" and other similar words do not indicate a quantitative limitation, but indicate the existence of at least one. "Include" or "comprise" and other similar words mean that the elements or objects appearing before "include" or "comprise" cover the features, wholes, steps, operations, elements and / or components listed after "include" or "comprise", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] Based on the prior art, slurry pumps are mostly applied in combination with a pump casing and a jacket structure. For a slurry pump that needs to adopt a lower horizontal outlet arrangement, the liquid level inlet height is higher than the outlet height during operation. In this case, the air in the slurry pump cavity cannot be completely discharged, and there are phenomena such as cavitation and air binding, which lead to a decrease in product performance. Therefore, the utility model aims to propose an exhaustable single-shell slurry pump casing and a slurry pump, improve the pump casing to a single pump casing thickened design, and design an exhaust unit, so as to effectively solve the problems existing in the existing slurry pump and improve the operating reliability and service life of the slurry pump.

[0037] The exhaustable single-casing slurry pump casing and the slurry pump disclosed in the utility model are further specifically introduced below in conjunction with the accompanying drawings.

[0038] Combination Figures 1 to 3The pump casing of the exhaustable single-shell slurry pump shown includes a volute 1 and an exhaust unit arranged on the surface of the volute 1; the exhaust unit includes an exhaust hole, a sealing structure and a limiting structure; the exhaust hole passes through the shell surface of the volute 1 and is connected to the interior of the volute 1, and one end of the sealing structure is adapted to the exhaust hole; the limiting structure connects the volute 1 and the sealing structure from the outside of the volute 1, and the limiting structure has at least two states, unlocked and locked, on the volute 1; when the limiting structure is in a locked state on the volute 1, the end of the sealing structure is adapted to extend into the exhaust hole, and the sealing structure is sealed and fixed in the exhaust hole to prevent the detachable plug 2 from moving outward due to outward pressure when the pump is working, affecting the sealing of the volute 1; in the embodiment, when the pump casing of the slurry pump is set to a lower horizontal outlet, the exhaust unit is set at the highest point of the casing away from the outlet of the volute 1. The solution is to provide a detachable exhaust unit on the volute 1. When the slurry pump is set to the lower horizontal outlet direction, water or other liquids can be injected into the volute 1. When the limiting structure is in the unlocked state, the gas at the top of the pump casing is discharged to reduce gas accumulation, effectively reduce the harm of cavitation and air binding to the slurry pump, and reduce the eccentric force on the impeller during operation, thereby achieving the technical effect of improving the stability of the slurry pump operation and increasing the service life of the slurry pump.

[0039] In the structure shown in the figure, the sealing structure of the pump casing of the exhaust single-shell slurry pump is configured as a removable plug 2, one end of the removable plug 2 is configured as a structure adapted to the inner wall of the exhaust hole, and the other end is configured as a cover plate structure; the cover plate structure is covered on the open end surface of the exhaust hole close to the outer side of the volute 1, and a positioning portion 8 is provided on the side of the cover plate structure away from the exhaust hole, and the sealing structure connects the limiting structure and the volute 1 via the positioning portion 8. In the present embodiment, the exhaust hole is configured as a cylindrical hole, and the end of the removable plug 2 that cooperates with the inner wall of the cylindrical hole is configured as a cylindrical structure; the outer wall of the cylindrical structure is provided with a plurality of sealing portions, and the sealing portions are annular and evenly distributed on the outer wall of the cylindrical structure along the axial direction. Figure 3 As shown, the sealing part is composed of an O-ring 3, and the O-ring 3 is made of ethylene propylene diene monomer (EPDM) rubber. Specifically, a plurality of sealing grooves are arranged around the outer wall of the cylindrical structure, and the sealing grooves are evenly distributed on the outer wall of the cylindrical structure along the axial direction. The number of the O-rings 3 corresponds to the number of the sealing grooves, and the O-rings 3 are adapted to be installed in the sealing grooves. In the embodiment, two sealing grooves for installing the O-rings 3 are opened on the detachable plug 2, which play a double sealing role. By optimizing the size of the groove, the installation is convenient, and the plugging and unplugging can be repeated without affecting the sealing.

[0040] The limiting structure of the pump casing of the exhaustable single-shell slurry pump includes a limiting part 7 and a locking part, and the locking part is detachably connected to the limiting part 7; in the figure, the limiting part 7 includes two positioning plates symmetrically arranged on both sides of the exhaust hole along the spiral direction of the volute, and the two positioning plates are parallel to each other; the positioning part 8 is located between the two positioning plates, and the locking part sequentially connects and tightens the positioning plates and the positioning part 8 to realize the locking state of the limiting structure. In the illustrated scheme, the locking part is a limiting bolt assembly, and the limiting bolt assembly includes a stud, a nut and a flat washer 5; the positioning part 8 is set as a flat plate structure, the flat plate structure is parallel to the positioning plate, and a positioning hole is respectively set at the corresponding position of the flat plate structure and the two positioning plates; the stud passes through the positioning hole in turn, and then the flat washer is installed and locked with the nut. In the figure, the stud and nut are selected as a hexagonal stud 4 and a hexagonal nut 6 respectively.

[0041] In order to facilitate the processing and manufacturing of the volute 1, the limiting portion 7 is integrally formed with the volute 1; in addition, in order to facilitate the later processing of the exhaust hole, when the pump casing is processed, the partial area of ​​the outer surface of the volute 1 located between the two positioning plates is set as a plane and cast, and the exhaust hole is set in the area of ​​the plane.

[0042] Another embodiment of the utility model discloses a slurry pump adopting the above-mentioned volute 1. To ensure the structural strength of the slurry pump, the volute 1 adopts a single pump casing thickening design, and the main material adopts wear-resistant high-chromium alloy steel, which has strong wear resistance; the removable plug 2 is also made of high-chromium alloy steel, taking into account both strength and wear resistance; before the slurry pump works, the limit structure is first unlocked to put it in an unlocked state, and then the removable plug 2 is pulled out, and water or other liquids are injected into the volute, which can effectively discharge the gas in the volute 1. After exhausting the gas, the removable plug 2 is inserted to play a sealing role when the slurry pump is working.

[0043] The exhaustable single-shell slurry pump casing disclosed in the utility model is not only suitable for maximally discharging the gas in the volute when the slurry pump is used for the lower horizontal outlet, but can also be used normally when used for other outlet directions, such as vertical upward outlet and upper horizontal outlet, thereby improving the versatility of the product. At the same time, the structure of the utility model can reduce the cavitation and gas binding phenomena of the slurry pump, and make the slurry pump run more stably by reducing the eccentric force on the impeller during operation, thereby effectively improving the service life of the volute; in addition, the design of a single pump casing and a thickened volute, and the use of wear-resistant high-chromium alloys, can further improve the service life of the slurry pump and the convenience of installation and use; overall, it helps enterprises to reduce costs and increase efficiency.

[0044] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. An exhaustable single-shell slurry pump casing, characterized in that: It includes a volute and an exhaust unit arranged on the surface of the volute; The exhaust unit includes an exhaust hole, a sealing structure and a limiting structure; the exhaust hole passes through the shell surface of the volute and is connected to the interior of the volute, and one end of the sealing structure is adapted to the exhaust hole; the limiting structure connects the volute and the sealing structure from the outside of the volute, and the limiting structure has at least two states, unlocked and locked, on the volute; when the limiting structure is in a locked state on the volute, the end of the sealing structure is adapted to extend into the exhaust hole, and the sealing structure is sealed and fixed in the exhaust hole; when the limiting structure is in an unlocked state on the volute, the end of the sealing structure is drawn out of the exhaust hole to exhaust the gas inside the volute.

2. The exhaustable single-shell slurry pump casing according to claim 1, characterized in that: The sealing structure is a removable plug, one end of which is configured to be adapted to the inner wall of the exhaust hole, and the other end is configured to be a cover plate structure; the cover plate structure is covered on the open end surface of the exhaust hole close to the outer side of the volute, and a positioning portion is provided on the side of the cover plate structure away from the exhaust hole, and the sealing structure is connected to the limiting structure and the volute via the positioning portion.

3. The exhaustable single-shell slurry pump casing according to claim 2, characterized in that: The limiting structure comprises a limiting portion and a locking portion, wherein the locking portion is detachably connected to the limiting portion; The limiting portion includes two positioning plates symmetrically arranged on both sides of the exhaust hole along the spiral direction of the volute, and the two positioning plates are parallel to each other; the positioning portion is located between the two positioning plates, and the locking portion sequentially connects and fastens the positioning plates and the positioning portion.

4. The exhaustable single-shell slurry pump casing according to claim 2, characterized in that: The exhaust hole is set as a cylindrical hole, and the end of the removable plug that cooperates with the inner wall of the cylindrical hole is set as a cylindrical structure; the outer wall of the cylindrical structure is provided with a plurality of sealing parts, which are annular and evenly distributed on the outer wall of the cylindrical structure along the axial direction.

5. The exhaustable single-casing slurry pump casing according to claim 2, characterized in that: The exhaust hole is set as a cylindrical hole, and the end of the detachable plug that cooperates with the inner wall of the cylindrical hole is set as a cylindrical structure; a plurality of sealing grooves are arranged around the outer wall of the cylindrical structure, and the sealing grooves are evenly distributed on the outer wall of the cylindrical structure along the axial direction; The sealing structure further includes a plurality of O-rings, the number of the O-rings corresponds to the number of the sealing grooves, and the O-rings are adapted to be installed in the sealing grooves.

6. The exhaustable single-casing slurry pump casing according to claim 3, characterized in that: The locking part is a limit bolt assembly, and the limit bolt assembly includes a stud, a nut and a flat washer; The positioning part is set as a flat plate structure, the flat plate structure is parallel to the positioning plate, and a positioning hole is respectively set at the corresponding positions of the flat plate structure and the two positioning plates; the studs pass through the positioning holes in sequence and then are fitted with the flat washers and the nuts for locking.

7. The exhaustable single-casing slurry pump casing according to claim 3, characterized in that: The partial area of ​​the outer surface of the volute between the two positioning plates is set as a plane, and the exhaust hole is set in the area of ​​the plane.

8. The exhaustable single-casing slurry pump casing according to claim 3, characterized in that: The limiting portion is integrally formed with the volute.

9. The exhaustable single-casing slurry pump casing according to claim 1, characterized in that: When the pump casing of the slurry pump is arranged with a lower horizontal outlet, the exhaust unit is arranged at the highest point of the casing away from the volute outlet.

10. Slurry pump, characterized in that: The pump casing of the slurry pump is an exhaustible single-shell slurry pump casing as described in any one of claims 1 to 9.

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