Wear-resistant impurity pump and pump body thereof

Abstract

The invention discloses a wear-resistant impurity pump and a pump body thereof, the wear-resistant impurity pump comprises the pump body, an impeller and a sealing device arranged between the pump body and the impeller, and the sealing device comprises a moving ring, a static ring and a guide sleeve; a static ring cavity for accommodating the static ring is formed between the radial outer side of the guide sleeve and the pump body; a medium enters an impeller suction inlet of the impeller through the radial inner side of the guide sleeve, the end, away from the impeller, of the static ring is a free end, and the end, capable of making contact with the movable ring, of the static ring is a friction end. The static ring can move in the axis direction of the guide sleeve. The static ring cavity is communicated with a flushing water inlet; the radial size of the guide sleeve is larger than that of the static ring. The wear-resistant impurity pump can prevent or reduce internal leakage of media, and is better in sealing performance and wear resistance, low in cost and easy to maintain.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of manufacturing wear-resistant impurity pumps, and particularly relates to a wear-resistant impurity pump and a pump body thereof. BACKGROUND

[0002] The vane pump is the most common fluid conveying device; when the conveyed liquid contains solid particles, that is, the medium is a liquid-solid two-phase flow, the vane pump is often referred to as an impurity pump. The impurity pump is also sometimes referred to as a slurry pump, a sewage pump, a sand pump, etc. according to different use scenarios. Since the solid particles will cause great wear to the impeller, the pump body and other flow parts of the pump, the flow parts of the impurity pump are generally made of a material that is resistant to wear, such as wear-resistant alloy, wear-resistant rubber, ceramic, etc. For a clean water pump, in order to improve the efficiency of the pump, a sealing ring is generally designed to reduce internal leakage, but for an impurity pump, since the solid particles will quickly wear and fail the sealing ring, a vice vane is generally designed to reduce internal leakage. However, whether it is a sealing ring or a vice vane, internal leakage of the impurity pump is unavoidable. For the impurity pump, internal leakage not only leads to a decrease in the working efficiency of the pump, but more importantly, it leads to accelerated wear of the flow parts, because when the particles in the medium leak from the high-pressure area in the pump body to the suction inlet through the gap between the impeller front cover plate and the pump body, the scouring speed of the medium on the outer surface of the impeller front cover plate and the surface of the corresponding pump body part is much higher than that on other parts such as the flow parts, which also leads to a much higher wear rate of the surface of this part than that of other parts.

[0003] In order to solve this problem, the invention patent with the authorization patent number CN114738311B discloses “a leakage-free centrifugal pump”, the utility model patent with the authorization patent number CN2150371Y discloses “a pump suction inlet ring sealing device”, and the invention patent application with the publication number CN116696784A discloses “a mud and sand pump for ships with an inlet sealing ring”. The above three patents / patent applications all disclose a structure similar to a mechanical seal friction pair at the position of the sealing ring of the impeller, which is pressed tightly by an elastic member such as a spring, and the medium in the high-pressure area of the water chamber is blocked from leaking to the low-pressure area of the suction inlet by the friction pair. This structure can indeed solve the leakage problem in theory, but in actual operation, the service life of the friction pair will be very short under the influence of the medium containing a large number of particles, so it is difficult to promote in actual industrial applications.

[0004] Therefore, in order to improve the service life of the impeller ring part, the invention patent application with the application number of CN116696784A discloses "a slurry pump with an inlet sealing ring for use on a ship", which proposes a technical solution of opening a flushing hole at the ring part to flush the ring part with external clean water through the flushing hole. However, this technical solution cannot reduce the leakage flow of the high-pressure area of the pressure chamber to the suction port, and the wear condition of the outer surface of the impeller front cover plate and the corresponding flow surface of the pump body is not significantly improved, so the effect of prolonging the service life of the flow member is very limited.

[0005] In addition, the invention patent application with the application number of CN116066373A discloses a "zero leakage easy-to-maintain high-efficiency slurry pump", which proposes a solution of setting 4 pairs of friction pairs, injecting high-pressure clean water into the friction pairs, forming two high-pressure clean water chambers in front and back, and using clean water to flush and cool the 4 pairs of friction pairs to reduce the wear of the flow member. The above-mentioned solution can indeed reduce the wear of the flow member in theory, but the structure of the slurry pump of the solution is complex, the manufacturing cost is high, and the service life of the friction pairs is difficult to guarantee, which leads to high maintenance frequency, and the entire pump body needs to be disassembled when the friction pairs are replaced, so the maintenance workload is large, and therefore the promotion difficulty is large. SUMMARY

[0006] The present application provides a wear-resistant impurity pump that can prevent or reduce internal medium leakage, has better sealing performance and wear resistance, is low in cost, and is easy to maintain.

[0007] A second object of the present application is to provide a pump body for the wear-resistant impurity pump.

[0008] The technical solution of the present application to solve the above-mentioned technical problems is: A wear-resistant impurity pump, comprising a pump body, an impeller, and a sealing device arranged between the pump body and the impeller, wherein the sealing device comprises a dynamic ring, a static ring, and a guide sleeve; a static ring cavity for accommodating the static ring is formed between the radial outer side of the guide sleeve and the pump body, or the static ring cavity is formed by the guide sleeve and the bushing arranged on the radial outer side thereof; medium enters an impeller suction port of the impeller through the radial inner side of the guide sleeve; one end of the static ring away from the impeller is a free end, and the other end of the static ring capable of contacting the dynamic ring is a friction end; the static ring is capable of moving along the axial direction of the guide sleeve; and the static ring cavity is communicated with a flushing water inlet.

[0009] Preferably, the radial dimension of the guide sleeve is greater than the radial dimension of the static ring.

[0010] Preferably, the guide sleeve is mounted on the pump body and can be inserted into the pump body along the suction direction of the impeller, and the static ring can be inserted into the pump body along the suction direction of the impeller.

[0011] Preferably, the guide sleeve extends from the outer end surface of the pump body to the suction inlet of the impeller, and a positioning flange is arranged on the guide sleeve and located at the end of the guide sleeve away from the impeller; the pump body is provided with a positioning stop at a position corresponding to the positioning flange; the positioning stop and the pump body are coaxially arranged; the outer diameter of the positioning flange is greater than the outer diameter of the static ring.

[0012] Preferably, the flushing water inlet is arranged at the end of the static ring cavity away from the impeller and close to the positioning flange.

[0013] Preferably, a first fit clearance exists between the guide sleeve and the static ring, and a second fit clearance exists between the static ring and the pump body; the size of the first fit clearance is smaller than the size of the second fit clearance.

[0014] Preferably, a sealing member is arranged between the guide sleeve and the static ring, and the sealing member is a sealing ring.

[0015] Preferably, the sealing device further comprises an anti-rotation structure for preventing relative rotation between the guide sleeve and the static ring; the anti-rotation structure comprises a pin arranged on the guide sleeve; the axis direction of the pin is parallel to the axis direction of the static ring cavity; and a key groove is arranged on the static ring and matched with the pin.

[0016] Preferably, the sealing device further comprises an elastic member for driving the static ring to move towards the dynamic ring; one end of the elastic member acts on the static ring, and the other end of the elastic member acts on the guide sleeve; when the guide sleeve is removed, the elastic member is taken out from the pump body in the direction opposite to the suction direction of the impeller.

[0017] Preferably, the axial length of the static ring is 3-20 times the axial length of the dynamic ring, and the hardness of the static ring is less than the hardness of the dynamic ring.

[0018] Preferably, an inlet flange is arranged on the end of the pump body outside the suction inlet, the outer end surface of the guide sleeve is flush with the end surface of the inlet flange; the flushing water inlet is close to the inlet flange, and the axis direction of the flushing water inlet is perpendicular to the axis direction of the pump body.

[0019] Preferably, the static ring is provided with a plurality of water holes extending from the free end to the friction end of the static ring and a water guide groove at the friction end of the static ring, wherein the water guide groove is annular; the outer side of the friction end of the static ring is provided with a plurality of water injection holes.

[0020] A pump body for the wear-resistant impurity pump.

[0021] Compared with the prior art, the wear-resistant impurity pump has the following advantages and beneficial effects: 1. The sealing device of the wear-resistant impurity pump has a simple structure, the guide sleeve not only serves as a channel for the medium to flow into the suction port of the impeller, but also helps the static ring maintain coaxiality and flatness with the dynamic ring, so that the axial length of the static ring can be extended to obtain a longer compensation length without increasing the axial size of the impurity pump, thereby improving the coaxiality and flatness of the static ring and the dynamic ring, which is conducive to reducing the wear of the friction pair formed between the static ring and the dynamic ring; on the other hand, the static ring can also have a smaller radial size, thereby reducing the friction linear velocity between the friction pair and prolonging the service life of the friction pair.

[0022] 2. During operation of the wear-resistant impurity pump, the flushing water can flow from the gap between the static ring cavity and the static ring to the friction pair formed by the static ring and the dynamic ring, and the water pressure pushes the static ring to move axially towards the dynamic ring, so that the dynamic ring and the static ring are in contact to block the channel for the medium in the high-pressure area to leak to the low-pressure area, thereby reducing the leakage amount to the inlet bottom pressure area; since the pressure of the flushing water can be higher than the pressure of the medium at the friction pair and the suction port, the flushing water can penetrate into the surface of the friction pair and lubricate and cool it. Compared with the prior art, the contact force and sealing effect between the static ring and the dynamic ring will not change significantly due to the surface wear of the friction pair and the change in the length of the static ring, and the medium entering the friction pair mainly contains high-pressure clean water, which carries fewer solid particles, so the service life of the friction pair can be greatly improved.

[0023] 3. During operation of the wear-resistant impurity pump, when the amount and pressure of the flushing water are appropriate, the injection amount of the flushing water can be greater than the leakage amount between the friction pair, at this time, the medium in the high-pressure area of the pump body will not leak towards the suction port, part of the flushing water will flow from the friction pair to the high-pressure area of the pump body, and the solid particles in the medium are difficult to enter the gap between the front cover plate of the impeller and the pump body due to the centrifugal action of the impeller rotation, which greatly reduces the wear of the outer surface of the front cover plate of the impeller and the corresponding part of the pump body, thereby improving the service life of the impurity pump.

[0024] 4、Even if the water quantity of the flushing water is less than the leakage quantity between the friction pairs, the leakage quantity of the high pressure area of the pump body to the suction port can be reduced, thereby reducing the flow rate or concentration of the leakage and improving the service life of the wear impurities pump of the present application.

[0025] 5、Compared with the prior art, when the friction pairs need to be repaired, the static ring and other vulnerable parts can be replaced by disassembling the pump body. In the present application, the guide sleeve and the static ring and other vulnerable parts can be installed in the pump body in the direction of the suction port of the impeller, and can be removed from the pump body in the opposite direction. Thus, the static ring, guide sleeve and other vulnerable parts can be replaced without disassembling the pump body, and the workload of repair can be greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a cross-sectional view of a first embodiment of the wear impurities pump of the present application.

[0027] Figure 2 is a cross-sectional view of a second embodiment of the wear impurities pump of the present application. Figure 1 is a partial view at A.

[0028] Figure 3 is a cross-sectional view of a third embodiment of the wear impurities pump of the present application.

[0029] Figure 4 is a cross-sectional view of a fourth embodiment of the wear impurities pump of the present application. Figure 3 is a partial view at B.

[0030] Figure 5 is a cross-sectional view of a static ring.

[0031] Figure 6 is a cross-sectional view of a fifth embodiment of the wear impurities pump of the present application.

[0032] Figure 7 is a cross-sectional view of a sixth embodiment of the wear impurities pump of the present application. Figure 6 is a partial view at C.

[0033] Figure 8 is a cross-sectional view of a static ring.

[0034] Figure 9 is a cross-sectional view of a seventh embodiment of the wear impurities pump of the present application.

[0035] Figure 10 is a cross-sectional view of an eighth embodiment of the wear impurities pump of the present application. Figure 9 is a partial view at D.

[0036] Figure 11 is a cross-sectional view of a ninth embodiment of the wear impurities pump of the present application.

[0037] Figure 12 is a cross-sectional view of a tenth embodiment of the wear impurities pump of the present application. Figure 11 is a partial view at E.

[0038] Figure 13 This is a cross-sectional view of the sixth specific embodiment of the wear-resistant impurity pump of the present invention.

[0039] Figure 14 for Figure 13 A partial view at point F.

[0040] In the diagram: 1-Pump body, 101-Rear pump body, 102-Front pump body, 2-Impeller, 3-Flush water inlet, 4-Dynamic ring, 5-Static ring, 51-Water inlet hole, 52-Water guide groove, 53-Water spray hole, 6-Guide sleeve, 61-Positioning flange, 7-Static ring cavity, 8-Pin, 9-Sealing ring, 10-Spring, 11-Inlet flange, 12-Bushing, 1201-Bushing hole. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0042] Example 1 like Figure 1 and Figure 2 As shown, the wear-resistant impurity pump of this embodiment includes a pump body 1, an impeller 2 disposed within the pump body 1, and a sealing device disposed between the pump body 1 and the impeller 2. The sealing device includes a rotating ring 4, a stationary ring 5, and a guide sleeve 6. The rotating ring 4 is mounted on the front cover plate of the impeller 2. The radially outer side of the guide sleeve 6 and the pump body 1 form a stationary ring cavity 7 for accommodating the stationary ring 5. The medium flows radially inward through the guide sleeve 6 to the suction port of the impeller 2. The stationary ring 5 can move along the guide sleeve 6. The stationary ring 5 moves along its axis and one end of it contacts the moving ring 4; the end of the stationary ring 5 closest to the moving ring 4 is the friction end, and the end of the stationary ring 5 furthest from the moving ring 4 is the free end; the stationary ring cavity 7 is connected to the flushing water inlet 3, which is located at the end of the stationary ring cavity 7 furthest from the impeller 2 and close to the positioning flange 61; the water pressure of the medium entering the stationary ring cavity 7 can push the stationary ring 5 to move axially in the stationary ring cavity 7, so as to cause the friction end of the stationary ring 5 to contact the moving ring 4.

[0043] like Figure 1 , Figure 2 As shown, the radial dimension of the guide sleeve 6 is the outer diameter of the positioning flange 61, and the radial dimension of the stationary ring 5 is its outer diameter, with the former being larger than the latter.

[0044] like Figure 1 and Figure 2As shown in the drawings, the guide sleeve 6 is provided with a positioning flange 61, which is arranged at one end of the guide sleeve 6 away from the impeller 2. By arranging the positioning flange 61, the coaxiality of the guide sleeve 6 and the axis of the pump body 1 can be ensured during installation, so that the coaxiality of the axis of the static ring 5 and the axis of the impeller 2 is ensured, thereby reducing the wear of the static ring 5 and the dynamic ring 4 due to the non-coaxiality, and at the same time, the static ring cavity 7 can obtain a larger axial length to accommodate a longer static ring 5.

[0045] As shown in the drawings, Figure 1 and Figure 2 As shown in the drawings, the guide sleeve 6 extends from the outer end surface of the pump body 1 to the suction inlet of the impeller 2, and the medium enters the suction inlet of the impeller 2 from the radial inner side of the guide sleeve 6. The material of the guide sleeve 6 is wear-resistant alloy, which not only can obtain a longer service life, but also can prevent the medium from washing the static ring 5, thereby improving the service life of the static ring 5. The pump body 1 is provided with a positioning stop at a position corresponding to the positioning flange 501; the outer diameter of the positioning flange 61 is greater than the outer diameter of the static ring 5.

[0046] As shown in the drawings, Figure 1 and Figure 2 As shown in the drawings, the guide sleeve 6 can be installed into the pump body 1 in the suction direction of the impeller 2 (i.e. the guide sleeve 6 can be installed into the pump body 1 from right to left), and the static ring 5 can be installed into the pump body 1 in the suction direction of the impeller 2 (i.e. the static ring 5 can be installed into the pump body 1 from right to left), so that the easily-worn static ring 5 and the guide sleeve 6 can be replaced without disassembling the pump body 1, thereby greatly reducing the maintenance workload.

[0047] As shown in the drawings, Figure 1 and Figure 2 As shown in the drawings, the flush water inlet 3 is arranged at one end of the static ring cavity 7 away from the impeller 2 and close to the positioning flange 61, so that the static ring 5 can obtain a larger axial length to obtain a longer service life.

[0048] In addition, the pressure of the flush water is about 30% higher than the outlet pressure of the wear-resistant impurity pump in the present embodiment, and the flush water is generally industrial clean water; when the wear-resistant impurity pump in the present embodiment is working, the flush water enters the static ring cavity 7 from the flush water inlet 3, and the static ring 5 is pushed by the water pressure in the static ring cavity 7 to move towards the dynamic ring 4 and contact with it, thereby blocking the high-pressure medium in the pressure chamber from leaking into the suction chamber.

[0049] In addition, the flushing water in the static ring cavity 7 enters the outside of the friction pair composed of the friction end face of the static ring 5 and the dynamic ring 4 from the first matching gap of 3-4 mm between the static ring 5 and the pump body 1, part of the flushing water penetrates from the high pressure area outside the friction pair to the low pressure area inside the friction pair, thereby cooling and lubricating the friction pair, so as to improve the service life of the friction pair; another part of the flushing water flows from the outside of the friction pair to the high pressure area of the pressure chamber along the gap between the front cover plate of the impeller 2 and the pump body 1, thereby preventing the solid particles in the high pressure area of the pressure chamber from entering the gap between the front cover plate of the impeller 2 and the pump body 1, so as to reduce the wear between the two. The first matching gap between the static ring 5 and the guide sleeve 6 is 0.5-0.8 mm, which is smaller than the second matching gap between the static ring 5 and the pump body 1, so that most of the flushing water enters the high pressure area of the pressure chamber, thereby reducing the amount of flushing water entering the suction port, and further reducing the consumption of flushing water.

[0050] As shown in Figure 1 and Figure 2 , the material of the static ring 5 is bronze, and the material of the dynamic ring 4 is tungsten carbide hard alloy. Since the hardness of the dynamic ring 4 is much greater than that of the static ring 5, the wear rate of the dynamic ring 4 is much smaller than that of the static ring 5. After the static ring 5 is worn, under the action of the flushing water pressure, the static ring 5 moves axially towards the dynamic ring 4 to compensate for the wear, thereby ensuring the contact of the friction pair, so that the sealing effect is almost not affected by wear. Since the static ring 5 can be designed to have a longer axial length, a longer service life can be obtained. Generally, the axial length of the static ring 5 can be 3-30 times the axial length of the dynamic ring 4. When less than 3 times, the service life of the static ring 5 is too short; and when more than 30 times, the axial length of the pump body 1 is too large, thereby making the manufacturing cost of the wear-resistant impurity pump in the embodiment too high.

[0051] In the embodiment, the axial length of the static ring 5 is 400 mm, and the axial length of the dynamic ring 4 is 22 mm, which is 18.2 times the axial length of the dynamic ring 4.

[0052] As shown in Figure 1 and Figure 2 , the end of the suction side of the pump body 1 is provided with an inlet flange 11, and the outer end face of the guide sleeve 6 is flush with the end face of the inlet flange 11. The guide sleeve 6 extends from the outside of the pump body 1 to the suction port of the impeller 2 in the suction direction of the impeller 2. In this way, the guide sleeve 6 can be fastened by the flange on the suction pipeline matched with the inlet flange 11, so that the guide sleeve 6 obtains the maximum axial length, that is, the cost is saved, and the maintenance and assembly are facilitated.

[0053] As shown in Figure 1 and Figure 2As shown, the flushing water inlet 3 is close to the inlet flange 11 and far from the suction port of the impeller 2; the axis direction of the flushing water inlet 3 is perpendicular to the axis direction of the pump body 1, which is also to make the static ring 5 have a longer axial length.

[0054] Obviously, in this embodiment, the guide sleeve 6 can also be made as a combination for improving the process or reducing the cost.

[0055] Embodiment 2 The differences between this embodiment and embodiment 1 are mainly as follows: As Figure 3 - Figure 5 As shown, the static ring 5 is provided with 20 water holes 51 extending along the axis direction and penetrating the free end and the friction end of the static ring 5, so that the flushing water can be injected into the friction surface between the dynamic ring 4 and the static ring 5 through the water holes 51 to form a structure similar to a static pressure thrust bearing, so that the lubrication condition of the friction surface is greatly improved, thereby further improving the service life of the friction pair.

[0056] In addition, the friction end surface of the static ring 5 is also provided with a water guide groove 52 communicating with the water hole 51, which can further improve the lubrication condition of the friction pair and improve the service life of the friction pair.

[0057] In addition, the guide sleeve 6 and the static ring 5 are provided with an anti-rotation structure for preventing relative rotation between the guide sleeve 6 and the static ring 5; the anti-rotation structure includes a pin 8 provided on the guide sleeve 6; the axis direction of the pin 8 is parallel to the axis direction of the static ring cavity 7; the static ring 5 is provided with a key groove matched with the pin 8. By providing the anti-rotation structure, the rotation of the static ring 5 can be prevented to cause the wear of the static ring 5 or the static ring cavity 7, thereby improving the service life of the guide sleeve 6 and the static ring 5.

[0058] In this embodiment, the material of the pump body 1 is wear-resistant steel, and the material of the guide sleeve 6 is 316L stainless steel; in order to prevent the pump body 1 from rusting and blocking the static ring 5, a bushing 12 made of 316 material is arranged on the radial outer side of the guide sleeve 6, and the guide sleeve 6 and the bushing 12 form the static ring cavity 7; the bushing 12 is provided with a bushing hole 1201 for the flushing water to enter the static ring cavity 7.

[0059] Embodiment 3 The differences between this embodiment and embodiment 2 are mainly as follows: As Figure 6 - Figure 8 As shown, the static ring 5 and the guide sleeve 6 are provided with a sealing ring 9, which can reduce the leakage flow of the flushing water to the suction port, thereby improving the efficiency of the wear and impurity pump in this embodiment, and also reducing the consumption of the flushing water; in addition, this also corresponds to adding a damping mechanism, thereby reducing the vibration amplitude of the static ring 5 and improving the service life of the friction pair.

[0060] In addition, 20 water injection holes 53 are arranged on the end face of the friction end of the static ring 5 and communicate with the water inlet hole 51, so that the leakage amount to the high pressure area of the pressure chamber is increased, and thus the amount of solid particles in the gap between the front cover plate of the impeller 2 and the pump body 1 is less, and the service life of the impeller 2 and the pump body 1 is further improved.

[0061] Embodiment 4 The differences between this embodiment and embodiment 2 are mainly as follows: As shown in Figure 9 and Figure 10 , the end face area of the friction end of the static ring 5 (including the area of the water hole 51 and the water guide groove 52 and the water injection hole 53) is greater than the end face area of the free end of the static ring 5 (including the area of the water hole 51), and through the above arrangement, the following advantages are obtained: For a high-lift pump, since the pressure of the pressure chamber is greatly different from that of the suction port, the water pressure difference between the free end and the friction end of the static ring 5 is also large, which may cause the pressure between the friction surfaces of the static ring 5 and the dynamic ring 4 to be too large, resulting in a shortened service life of the friction pair; if the area of the friction end of the static ring 5 is greater than that of the free end, the resultant force of the pressures of the flushing water acting on the free end and the friction end of the static ring 5 will be reduced, which can reduce the unit area pressure between the friction pairs, thereby improving the service life of the friction pairs.

[0062] In this embodiment, the material of the pump body 1 is wear-resistant steel, and the material of the guide sleeve 6 is 316L stainless steel. To prevent the pump body 1 from rusting and sticking the static ring 5, a 316L material bushing 12 is arranged on the radial outside of the guide sleeve 6, and the guide sleeve 6 and the bushing 12 form a static ring cavity 7. A bushing hole 1201 is arranged on the bushing 12 for flushing water to enter the static ring cavity 7. The guide sleeve 6 and the bushing 12 are designed as an integral structure for process consideration.

[0063] Embodiment 5 The differences between this embodiment and embodiment 4 are mainly as follows: As shown in Figure 11 and Figure 12 , four springs 10 are further arranged between the guide sleeve 6 and the static ring 5, one end of the spring 10 acts on the guide sleeve 6, and the other end acts on the static ring 5, so that during maintenance, the guide sleeve 6, the static ring 5 and the spring 10 can be replaced without disassembling the pump body 1, thereby greatly reducing the maintenance workload of replacing the wearing parts.

[0064] In addition, through the above arrangement, the following advantages are obtained: When the flushing water is injected into the friction end of the static ring 5 through the water inlet hole 51 on the friction end of the static ring 5, the water pressure of the friction end of the static ring 5 is in a fluctuating state, and when the flushing water pushes the static ring 5 to move axially in the direction of the dynamic ring 4, the water inlet hole 51 or the water guide groove 52 of the friction end of the static ring 5 is blocked, so that the pressure of the flushing water at the friction end of the static ring 5 naturally rises, thereby preventing the static ring 5 from moving in the direction of the dynamic ring 4, and the forces in two directions reach a balance at a certain position, but due to the inertia of the static ring 5 and the water, the static ring 5 cannot stably stay at the balance point, but vibrates near the balance point; if the vibration amplitude is large, it may accelerate the wear of the friction pair, thereby increasing the consumption of flushing water; by arranging a plurality of elastic members (springs 10) on the free end side of the static ring 5, which is equivalent to adding a damping mechanism, thereby reducing the vibration amplitude of the static ring 5, and further improving the service life of the friction pair, thereby reducing the consumption of flushing water. In addition, a sealing ring 9 can be arranged between the static ring 5 and the static ring cavity 7 or the guide sleeve 6, which can also have a similar effect; in the embodiment, since the sealing force of the friction pair is not entirely dependent on the elastic force of the spring 10, the linear spring force of the spring 10 can be designed differently from the prior art, which can be more conducive to improving the service life of the friction pair.

[0065] As shown in Figure 11 and Figure 12 The pump body 1 is composed of two parts, a front pump body 102 and a rear pump body 101, so that different parts can be replaced according to the wear condition during maintenance, thereby reducing the maintenance cost.

[0066] Embodiment 6 The main differences between this embodiment and embodiment 5 are: As shown in Figure 13 and Figure 14 The pump body 1 is also divided into a front pump body 102 and a rear pump body 101, but the division positions are different, but different positions can be replaced according to the wear condition of the pump body 1, thereby reducing the operation cost.

[0067] In addition, the impeller 2 in this embodiment is made of high-chromium wear-resistant alloy, and the dynamic ring 4 is directly machined on the blank of the impeller 2, so that the manufacturing cost can be reduced; at this time, the thickness dimension of the dynamic ring 4 in the axial direction is the thickness of the front cover plate of the impeller 2 corresponding to the static ring 5.

[0068] In this embodiment, the axial length of the static ring 5 is 220 mm, and the axial length of the dynamic ring 4 is 35 mm, which is 6.3 times that of the former.

[0069] The static ring 5 in the embodiment is combined by two materials, the free end is made of aluminum alloy, and the friction end is made of bronze, so that the manufacturing cost and inertia of the static ring 5 can be reduced.

[0070] Embodiment 7 The pump body 1 in the embodiment is provided with a space for accommodating the impeller 2 and the guide sleeve 6, and can be combined with the guide sleeve 6 to form a static ring cavity 7 for accommodating the static ring 5; the guide sleeve 6 and the static ring 5 can be assembled into the pump body 1 along the suction direction of the impeller 2; a positioning stopper coaxial with the axis of the pump body 1 can be matched with a positioning flange 61 arranged on the guide sleeve 6 to position the guide sleeve 6; the medium enters the suction inlet of the impeller 2 from the outside along the axis of the pump body 1 through the radial inner side of the guide sleeve 6; In addition, the pump body 1 is provided with a flushing water inlet 3 communicated with the static ring cavity 7, and the end of the suction side of the pump body 1 is provided with an inlet flange 11; the outer end surface of the guide sleeve 6 is flush with the end surface of the inlet flange 11; the flushing water inlet 3 is close to the inlet flange 11 and far away from the suction inlet of the impeller, and the axis direction thereof is perpendicular to the axis direction of the pump body 1.

[0071] The above is the preferred embodiment of the present application, but the embodiment of the present application is not limited by the above, and any change, modification, replacement, combination, simplification made without departing from the spirit and principle of the present application shall be equivalent replacement mode, which shall be included in the protection scope of the present application.

Claims

1. A pump for abrasive slurries, characterized in that, The sealing device comprises a pump body, an impeller, and a sealing device arranged between the pump body and the impeller, wherein the sealing device comprises a dynamic ring, a static ring, and a guide sleeve; a radial outer side of the guide sleeve and the pump body form a static ring cavity for accommodating the static ring, or the guide sleeve and a bushing arranged at a radial outer side of the guide sleeve form the static ring cavity for accommodating the static ring; medium enters an impeller suction inlet of the impeller through a radial inner side of the guide sleeve; an end of the static ring away from the impeller is a free end, and an end of the static ring capable of contacting the dynamic ring is a friction end; the static ring is capable of moving along an axial direction of the guide sleeve; the static ring cavity is communicated with a flushing water inlet; a radial dimension of the guide sleeve is greater than a radial dimension of the static ring.

2. The wear particulate pump of claim 1, wherein, The guide sleeve is mounted on the pump body and capable of being fitted into the pump body along a suction direction of the impeller, and the static ring is capable of being fitted into the pump body along the suction direction of the impeller.

3. The wear particulate pump of claim 1, wherein, The guide sleeve extends from an outer side end surface of the pump body to the suction inlet of the impeller; a positioning flange is arranged on the guide sleeve and arranged at an end of the guide sleeve away from the impeller; the pump body is provided with a positioning stopper at a position corresponding to the positioning flange; the positioning stopper and the pump body are coaxially arranged; an outer diameter of the positioning flange is greater than an outer diameter of the static ring.

4. The wear particulate pump of claim 3, wherein, The flushing water inlet is arranged at an end of the static ring cavity away from the impeller and close to the positioning flange.

5. The wear particulate pump of claim 1, wherein, A first matching gap exists between the guide sleeve and the static ring, and a second matching gap exists between the static ring and the pump body; a size of the first matching gap is smaller than a size of the second matching gap.

6. The wear particulate pump of claim 1, wherein, A sealing element is arranged between the guide sleeve and the static ring, and the sealing element is a sealing ring.

7. The wear debris tolerant pump of any of claims 1-6, wherein, The sealing device further comprises an anti-rotation structure for preventing relative rotation between the guide sleeve and the static ring; the anti-rotation structure comprises a pin arranged on the guide sleeve; an axial direction of the pin is parallel to an axial direction of the static ring cavity; a key groove is arranged on the static ring and matched with the pin.

8. The wear debris tolerant pump of any of claims 1-6, wherein, The sealing device further comprises an elastic element for driving the static ring to move towards the dynamic ring; one end of the elastic element acts on the static ring, and the other end of the elastic element acts on the guide sleeve; when the guide sleeve is removed, the elastic element is taken out from the pump body in a direction opposite to the suction direction of the impeller.

9. The wear-debris tolerant pump of any of claims 1-6, wherein, An axial length of the static ring is 3-20 times of an axial length of the dynamic ring, and a hardness of the static ring is smaller than a hardness of the dynamic ring.

10. The wear debris tolerant pump of any of claims 1-6, wherein, An inlet flange is arranged on an end of the pump body outside the suction inlet; an outer side end surface of the guide sleeve is flush with an end surface of the inlet flange; the flushing water inlet is close to the inlet flange, and an axial direction of the flushing water inlet is perpendicular to an axial direction of the pump body.

11. The wear debris tolerant pump of any of claims 1-6, wherein, A plurality of water holes extending from the free end of the static ring to the friction end of the static ring are arranged on the static ring, and a water guide groove communicated with the water holes is arranged at the friction end of the static ring; the water guide groove is annular; a plurality of water injection holes are arranged outside the friction end of the static ring.

12. A pump body for the wear-resistant impurity pump of claim 1.

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