Method for improving sealing performance of solid plunger pump
Patent Information
- Application Number
- CN202510923190.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-04
- Publication Date
- 2025-10-14
AI Technical Summary
Wear and tear of solid plunger pumps results in loose sealing of the pump chamber and reduced pumping efficiency. Existing technology requires replacement of all movable and fixed wear-resistant parts, increasing maintenance costs.
By testing the pumping efficiency, it can be determined whether to add soft contaminants or replace the plunger push head. Soft contaminants can be used to fill the wear gap, extend the service life of the equipment, and reduce the frequency of maintenance.
Improve pumping efficiency, reduce maintenance costs, extend equipment life, and reduce invalid circulation and kinetic energy waste.
Smart Images
Figure CN120774201A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of solid plunger pump, in particular, to a method for improving the sealing performance of solid plunger pump. BACKGROUND
[0002] The solid plunger pump is a kind of high-pressure and high-solid-content material conveying equipment, which is widely used in the fields of mining, metallurgy, chemical industry, environmental protection, etc. Its core feature is to directly compress solid materials through reciprocating plunger to realize stable conveying.
[0003] When the plunger reciprocates to convey solid materials, the plunger push head will be worn with the cutting ring and the inner circular liner. When the wear accumulates to a certain extent, the problem of poor sealing of the pump cavity will occur, which will further lead to the decrease of the pumping efficiency of the solid plunger pump and the increase of the kinetic energy consumption. At this time, the entire movable and fixed wear-resistant parts in the pump cavity need to be replaced to realize the resealing of the pump cavity and improve the pumping efficiency. However, this way of replacing all the movable parts will obviously increase the maintenance cost of the equipment. SUMMARY
[0004] The purpose of the present application is to provide a method for improving the sealing performance of solid plunger pump, which can seal the solid plunger pump according to the wear condition of the solid plunger pump and improve the pumping efficiency of the solid plunger pump.
[0005] In order to achieve the above-mentioned purpose, the present application provides a method for improving the sealing performance of solid plunger pump, comprising:
[0006] Step 1, detecting the single pumping volume of the solid plunger pump;
[0007] Step 2, judging whether to add soft contamination to the slurry material according to the detection result of step 1;
[0008] Step 3, when it is judged in step 2 that the soft contamination needs to be added, adding the soft contamination to the slurry material;
[0009] Step 4, judging whether to replace the new plunger push head according to the detection result of step 1;
[0010] Step 5, when it is judged in step 4 that the plunger push head needs to be replaced, making and replacing the new plunger push head;
[0011] Step 6, repeating steps 1-4 until the cutting ring is worn out.
[0012] Preferably, in step 1, the volume ratio of the soft contamination to the conveyed slurry material is 1:4-1:5.
[0013] Preferably, the soft contamination is in the form of sheet, and the maximum size is not greater than 10 cm.
[0014] Preferably, in step 3, if the actual measured single pumping amount is less than the set value, a new plunger head is replaced.
[0015] Preferably, in step 3, the actual inner diameter of the cutting ring is measured, and a new plunger head is made according to the actual inner diameter of the cutting ring.
[0016] Preferably, the width of the outer edge step of the plunger head that matches the cutting ring is increased.
[0017] Preferably, the single pumping material filling rate is increased to ensure effective filling of the material in the pump cavity.
[0018] Preferably, the pressure value of the mixer meets the delivery requirements of the solid plunger pump.
[0019] Preferably, the main plunger is lubricated.
[0020] According to the above technical solution, in the ideal working state of the solid plunger pump, a complete pressure sealing chain should be formed in the pump cavity: low pressure at the inlet → pressure increase in the compression cavity → high pressure at the outlet. If the matching surface of the plunger head and the cutting ring or the inner circular liner is worn, a radial gap will be formed, which will cause the pump cavity to be not tightly sealed, and higher motor power is required to meet the set pumping time yield requirement.
[0021] Actual production experience shows that when the radial gap is greater than 0.1 mm, it will have a greater impact on the pumping efficiency of the solid plunger pump. When the radial gap is caused by wear, during the plunger advancing stage, part of the material at the outlet of the solid plunger pump can leak back through the gap, resulting in a decrease in the actual discharge, i.e., a decrease in the single pumping amount and a decrease in the pumping efficiency. Moreover, the leaked material forms an invalid cycle in the pump cavity, and each time the plunger reciprocates, the material needs to be compressed again, which also causes a waste of kinetic energy.
[0022] When the single pumping amount decreases to a certain extent, soft contaminants need to be added to the slurry material. During the transfer of the slurry material by the solid plunger pump, the soft contaminants mixed in the slurry material are pushed by the plunger head, and with the movement of the plunger head, the soft contaminants will fill the gap between the plunger head step and the cutting ring, and with the movement of the plunger head, the soft contaminants are continuously compressed, eventually playing a sealing role between the plunger head and the cutting ring. By using soft contaminants to compensate for the wear between the plunger head and the cutting ring, the sealing effect of the solid plunger pump is improved, the single pumping weight is ensured, and the pumping efficiency is improved.
[0023] The soft contaminant is made of fiber material such as cotton and cloth, and is prone to be trapped in the gap between the plunger head and the inner cylinder liner during the pushing of the plunger head. With the continuous movement of the plunger head, the soft contaminant is compressed to fill the gap between the plunger head and the cutting ring and the inner cylinder liner due to wear, thereby improving the sealing effect of the pump cavity. The soft contaminant is soft in texture, and thus can prevent rigid wear between the plunger head and the cutting ring and the inner cylinder liner when the soft contaminant is located between the plunger head and the cutting ring and the inner cylinder liner, thereby protecting the sealing equipment.
[0024] However, with the long-term use of the solid plunger pump, the gap between the plunger head and the cutting ring and the inner cylinder liner will continue to increase. With the gradual increase of the gap, the pressure applied to the soft contaminant during the pushing of the plunger head gradually decreases, and the sealing effect between the plunger head and the cutting ring and the inner cylinder liner gradually decreases, thereby continuously reducing the pumping efficiency of the solid plunger pump.
[0025] During the use of the solid plunger pump, the single pumping volume of the solid plunger pump needs to be monitored in real time. Once the single pumping volume decreases to a certain extent, a new plunger head needs to be replaced.
[0026] After the replacement of the new plunger head, the solid plunger pump can be used as a new pump until the pumping efficiency thereof decreases again due to wear. At this time, the solid plunger pump can be resealed by adding soft contaminants to the slurry material, and the process is repeated until the cutting ring is worn out and a new set of moving and fixed wear-resistant components needs to be replaced for the pump cavity.
[0027] Therefore, by using the method for improving the sealing performance of the solid plunger pump, the wear of the relatively moving components in the cavity can be monitored by detecting the pumping efficiency of the solid plunger pump. When the pumping efficiency is insufficient for the first time, the pump cavity can be sealed by adding soft contaminants to the slurry material. When the pumping efficiency is insufficient for the second time, the pump cavity can be sealed by replacing a new plunger head. In this way, the solid plunger pump can be used until the cutting ring is worn out and a new set of moving and fixed wear-resistant components needs to be replaced for the pump cavity, thereby greatly saving the cost of equipment maintenance.
[0028] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0029] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the present application, but do not constitute a limitation on the present application. In the drawings:
[0030] Figure 1 Fig. 1 is a schematic diagram of a solid plunger pump;
[0031] Figure 2 Fig. 2 is an exploded view of the structure inside the pump cavity of a solid plunger pump.
[0032] Reference signs
[0033] 1 feed port 2 discharge port
[0034] 31 plunger push head 32 cutting ring
[0035] 33 inner circular bushing 34 main plunger
[0036] 4 main plunger sealing assembly DETAILED DESCRIPTION
[0037] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.
[0038] In the present application, the orientation words contained in the terms "one end, the other end" and the like only represent the orientation of the terms in the normal use state or the common name understood by those skilled in the art, without being regarded as a limitation of the terms, unless otherwise stated.
[0039] A method for improving the sealing performance of a solid plunger pump, comprising:
[0040] Step 1, detecting the single pumping volume of the solid plunger pump;
[0041] Step 2, judging whether to add soft contaminants to the slurry and residue material according to the detection result of Step 1;
[0042] Step 3, when it is judged in Step 2 that soft contaminants need to be added, adding soft contaminants to the slurry and residue material;
[0043] Step 4, judging whether to replace the new plunger push head 31 according to the detection result of Step 1;
[0044] Step 5, when it is judged in Step 4 that the plunger push head 31 needs to be replaced, making and replacing the new plunger push head 31;
[0045] Step 6, repeating Steps 1-4 until the cutting ring 32 is worn out.
[0046] By implementing the above technical solution, in the ideal working state of the solid plunger pump, a complete pressure sealing chain should be formed in the pump cavity: low pressure at the inlet → pressure increase in the compression chamber → high pressure at the outlet. If the mating surfaces of the plunger push head 31 and the cutting ring 32 or the inner circular liner 33 are worn, a radial gap will be formed, which will cause the pump cavity to be not tightly sealed, and a higher motor power is required to achieve the set pumping station output requirement.
[0047] Actual production experience shows that a radial gap greater than 0.1 mm will have a greater impact on the pumping efficiency of the solid plunger pump. When a radial gap is formed due to wear, during the plunger advancing stage, part of the material at the discharge port 2 of the solid plunger pump can leak back through the gap, resulting in a decrease in the actual discharge volume, i.e., a decrease in the single pumping volume and a decrease in the pumping efficiency. Moreover, the leaked material forms an invalid cycle in the pump cavity, and each time the plunger reciprocates, the material needs to be compressed again, which also causes a waste of kinetic energy.
[0048] When the single pumping volume of the solid plunger pump decreases to a certain extent, soft contaminants need to be added to the slurry material. During the transfer of the slurry material by the solid plunger pump, the soft contaminants mixed in the slurry material enter the pump cavity of the solid plunger pump through the inlet 1, and then are pushed by the plunger push head 31. With the movement of the plunger push head 31, the soft contaminants fill the gap between the plunger push head 31 and the cutting ring 32. With the continuous movement of the plunger push head 31, the soft contaminants are continuously compressed, and finally the soft contaminants are compressed between the plunger push head 31 and the cutting ring 32, thereby sealing the gap between the plunger push head 31 and the cutting ring 32. Therefore, by this method, the wear between the plunger push head 31 and the cutting ring 32 can be compensated for by using soft contaminants, the sealing effect of the solid plunger pump is improved, the single pumping weight is ensured, and the pumping efficiency is improved.
[0049] The soft contaminants are set as fibrous materials such as cotton and cloth. These soft contaminants are prone to be retained in the gap between the plunger push head 31 and the inner circular liner 33 during the pushing process of the plunger push head 31, and with the continuous movement of the plunger push head 31, the soft contaminants are easily compressed, thereby compensating for the gap between the plunger push head 31 and the inner circular liner 33 and the cutting ring 32 due to wear, and improving the sealing effect of the pump cavity. These soft contaminants are soft in texture, so when the soft contaminants are between the plunger push head 31 and the cutting ring 32 and the inner circular liner 33, rigid wear between the plunger push head 31 and the cutting ring 32 and the inner circular liner 33 can be avoided, thereby protecting the sealing equipment.
[0050] However, with the long-term use of the solid plunger pump, the gap between the plunger head 31 and the cutting ring 32 and the inner circular liner 33 will continue to increase, and as the gap gradually increases, the pressure applied to the soft contaminant during the pushing process of the plunger head 31 gradually decreases, and the sealing effect between the plunger head 31 and the cutting ring 32 and the inner circular liner 33 will gradually decrease, so the pumping efficiency of the solid plunger pump will also continue to decrease. When the pumping efficiency decreases to a certain extent, the sealing effect of the pump cavity needs to be improved by replacing the new plunger head 31.
[0051] After replacing the new plunger head 31, the solid plunger pump can be used as a new pump until its pumping efficiency decreases again due to wear, at which time the solid plunger pump can be resealed by adding soft contaminants to the slurry material, and so on, until the cutting ring 32 is worn out and a new set of moving and fixed wear-resistant components needs to be replaced for the pump cavity.
[0052] Therefore, using the method for improving the sealing performance of the solid plunger pump can monitor the wear condition of the relatively moving parts in the cavity by detecting the pumping efficiency of the solid plunger pump. When the pumping efficiency is insufficient for the first time, soft contaminants can be added to the slurry material to seal the pump cavity. When the pumping efficiency is insufficient again, a new plunger head 31 can be used to seal the pump cavity. In this way, the solid plunger pump can be used until the cutting ring 32 is worn out and a new set of moving and fixed wear-resistant components needs to be replaced for the pump cavity, thereby greatly saving equipment maintenance costs.
[0053] In this embodiment, preferably, in step 1, the volume ratio of soft contaminants to the slurry material being transported is 1:4-1:5.
[0054] In the mixer, the soft contaminants are mixed with the slurry material at a certain volume ratio, and the soft contaminants and the slurry material are uniformly mixed by stirring.
[0055] Preferably, the soft contaminants are added to the mixer at a volume ratio of 1:4-1:5, so that each time the solid plunger pump operates, the soft contaminants can reliably fill the gap between the plunger head 31 and the cutting ring 32 and the inner circular liner 33.
[0056] When the amount of soft contaminants added is less than 1 / 5 of the volume of the slurry material, the amount of soft contaminants contained in the slurry material pumped by the solid plunger pump will also decrease accordingly, and the soft contaminants in the slurry material pumped by the solid plunger pump each time cannot reliably fill the gap between the plunger head 31 and the cutting ring 32 and the inner circular liner 33 to achieve sealing.
[0057] When the amount of soft contamination is large, greater than 1 / 4 of the volume of the slurry, the soft contamination in the reward of each pumping will be more, which is beneficial to the sealing of the pump cavity, but the proportion of soft contamination in the slurry of each pumping will increase, which may affect the processing efficiency of the slurry by the solid plunger pump.
[0058] In this embodiment, preferably, the soft contamination is provided in the form of a sheet with a maximum size of not more than 10 cm.
[0059] The soft contamination is provided in the form of a sheet with a maximum size of not more than 10 cm, so the volume of each soft contamination is very small, and the soft contamination can be easily mixed with the solid slurry in the mixer, so that the soft contamination can be uniformly filled between the plunger head 31 and the cutting ring 32 and the inner circular liner 33 during the pushing of the solid slurry by the plunger head 31, to achieve reliable sealing of the gap between the plunger head 31 and the cutting ring 32 and the inner circular liner 33.
[0060] In the case of mixing the soft contamination with the solid slurry in a certain proportion, the amount of soft contamination in a unit volume can be reliably guaranteed. In this case, the smaller the size of the soft contamination, the greater the probability of the soft contamination being trapped by the cutting ring 32 during the pushing of the plunger head 31, so the actual amount of trapped soft contamination is more, and therefore more soft contamination exists between the plunger head 31 and the cutting ring 32 and the inner circular liner 33. During the overshoot of the movement of the plunger head 31, the pressure between the plunger head 31 and the cutting ring 32 and the inner circular liner 33 becomes larger and larger, and the soft contamination will be gradually squeezed, and finally the gap between the plunger head 31 and the cutting ring 32 and the inner circular liner 33 is reliably filled and sealed.
[0061] In this embodiment, preferably, in step 3, if the actual measured single pumping amount is less than the set value, a new plunger head 31 is replaced.
[0062] The new solid plunger pump does not need to add soft contamination to the slurry material when it is put into use. With the continuous wear during use, the gap between the plunger push head 31 and the cutting ring 32 and the inner circular liner 33 gradually increases, and the sealing effect of the pump cavity gradually deteriorates. At this time, soft contamination can be added to the slurry material, and the gap between the plunger push head 31 and the cutting ring 32 and the inner circular liner 33 can be filled with soft contamination to reseal the pump cavity. Then, with the use of the solid plunger pump, the gap between the plunger push head 31 and the cutting ring 32 and the inner circular liner 33 continues to increase until the pressure between the plunger push head 31 and the cutting ring 32 and the inner circular liner 33 cannot reliably compress the soft contamination in them to a state that can seal the pump cavity. At this time, the sealing performance of the solid plunger pump will also decrease.
[0063] When the single pumping volume of the solid plunger pump still cannot meet the set pumping volume requirement after adding soft contamination to the slurry material, it indicates that the sealing performance of the solid plunger pump has deteriorated, and a new plunger push head 31 needs to be replaced. By replacing the new plunger push head 31, the gap between the plunger push head 31 and the cutting ring 32 and the inner circular liner 33 is returned to a suitable state, and then the next round of wear is started.
[0064] In actual production, the control system of the solid plunger pump controls the amount of material fed to the solid plunger pump each time, and the system measures the number of pumping times of the solid plunger pump. The single pumping volume of the solid plunger pump can be calculated from the amount of material fed and the number of pumping times. Therefore, the single pumping volume of the solid plunger pump can be monitored in real time through the control system of the solid plunger pump.
[0065] In this embodiment, preferably, in step 3, the actual inner diameter of the cutting ring 32 is measured, and the fitting gap between the new plunger push head 31 and the cutting ring 32 is less than 2 mm.
[0066] When the new plunger push head 31 is replaced, the actual inner diameter of the cutting ring 32 can be measured, and the new plunger push head 31 can be made according to the actual inner diameter of the cutting ring 32.
[0067] The radius of the new plunger push head 31 is 1 mm smaller than the actual inner diameter of the cutting ring 32. After the new plunger push head 31 is installed, it can reliably cooperate with the original cutting ring 32 and the inner circular liner 33, and the pumping efficiency of the solid plunger pump can reach a good state.
[0068] In this way, it is not necessary to replace the plunger push head 31, the cutting ring 32 and the inner circular liner 33 at one time, which can greatly reduce the maintenance cost of the solid plunger pump.
[0069] In one embodiment, the diameter of the plunger head 31 of the solid plunger pump is 342 mm, the inner diameter of the cutting ring 32 and the inner circular liner 33 is equal to the diameter of the plunger head 31. When the plunger head 31 is replaced for the first time, the diameter of the plunger head 31 can be increased to 343 mm according to the actual situation. In the later period, the diameter of the plunger head 31 is still continuously increased according to the actual wear amount, so that the plunger head 31 can be sealingly matched with the cutting ring 32 and the inner circular liner 33, and the matching gap between the plunger head 31 and the cutting ring 32 and the inner circular liner 33 is ensured to be within 2 mm. In actual use, the cutting ring 32 and the inner circular liner 33 are synchronously worn, so that the synchronous matching and sealing effect of the plunger head 31, the cutting ring 32 and the inner circular liner 33 can be realized by increasing the diameter of the plunger head 31. The wear amount of the cutting ring 32 and the inner circular liner 33 can be offset at the same time by replacing the plunger head 31 with a larger diameter.
[0070] After that, as a new round of wear continues to occur, when the single pumping amount of the solid plunger pump decreases to a set value, the method for improving the sealing performance of the solid plunger pump can be used to add soft contaminants to the slurry material to improve the sealing performance of the solid plunger pump, thereby improving the pumping efficiency of the solid plunger pump. As the solid plunger pump continues to work, wear continues to occur, until the single pumping amount of the solid plunger pump decreases to the set value again, a new plunger head 31 needs to be replaced. By analogy, the relative motion components in the pump cavity need to be replaced only when the cutting ring 32 is worn out.
[0071] In this embodiment, preferably, the width of the outer edge step of the plunger head 31 matched with the cutting ring 32 is increased.
[0072] In order to improve the sealing effect of the soft contaminants on the matching position of the plunger head 31 and the cutting ring 32, the width of the outer edge step of the plunger head 31 matched with the cutting ring 32 can be increased.
[0073] When the plunger head 31 moves to the position of the cutting ring 32, as the plunger head 31 continues to move forward, the inner diameter of the cutting ring 32 is the same as the outer diameter of the plunger head 31. When the cutting ring 32 and the plunger head 31 start to match, the flocculent material in the slurry material, including the viscous contaminants in the slurry material, is cut off. Then, as the plunger head 31 moves, the soft contaminants in the slurry material are trapped between the plunger head 31 and the cutting ring 32. As the plunger head 31 continues to move, the space between the outer edge step of the plunger head 31 and the cutting ring 32 is gradually compressed, and the volume of the soft contaminants is also gradually compressed until the plunger head 31 no longer moves forward. Therefore, under the action of the plunger head 31 and the cutting ring 32, the soft contaminants between the plunger head 31 and the cutting ring 32 are gradually compressed until the gap between the plunger head 31 and the cutting ring 32 is completely sealed.
[0074] When the outer edge step width of the plunger push head 31 and the cutting ring 32 increases, the contact area between the plunger push head 31 and the cutting ring 32 increases, which means that the volume of the material trapped by the cutting ring 32 increases, and thus the volume of the material that can be used to seal the cutting ring 32 and the plunger push head 31 increases, and as the plunger push head 31 moves, the material is compressed and finally used to seal the gap between the cutting ring 32 and the plunger push head 31. Therefore, by increasing the outer edge step width of the plunger push head 31 and the cutting ring 32, the sealing effect of the soft contamination on the pump cavity during use can be significantly improved.
[0075] Furthermore, in the case of increasing the outer edge step width of the plunger push head 31 and the cutting ring 32, a smaller amount of soft contamination in unit volume of slurry material can be used to seal the plunger push head 31 and the cutting ring 32, and thus by increasing the outer edge step width of the plunger push head 31 and the cutting ring 32, the amount of soft contamination can also be appropriately reduced, thereby improving the processing efficiency of the solid plunger pump for slurry material.
[0076] In one embodiment, the plunger push head 31 has a material contact surface width of 7 cm, and the outer edge step of the plunger push head 31 is increased from the original 2.5 cm to 5 cm. By increasing the outer edge step of the plunger push head 31, the contact area of the plunger push head 31 with the cutting ring 32 and the inner circular liner 33 can be increased, and the material sealing effect can be achieved to avoid internal leakage.
[0077] In this embodiment, preferably, the filling rate of the material pumped at a time is increased to ensure effective filling of the material in the pump cavity.
[0078] A discharge screw is further provided between the mixer and the solid plunger pump, and the discharge is achieved by rotating the screw cutter inside the discharge screw. During daily operation, because the material is mixed with plastic, cotton and other long and fluffy materials, the fluffy material will be wound around the screw cutter during the discharge process, thereby compressing the discharge space. As the winding of the material continues, the discharge space of the discharge screw is gradually compressed, which eventually leads to poor discharge of the material, and the solid plunger pump cannot work at full load each time, thereby affecting the filling rate of the solid plunger pump.
[0079] When the filling rate of the solid plunger pump is insufficient, it can also cause no medium wear between the main plunger 34, the plunger push head 31, the cutting ring 32 and the inner circular liner 33. Once the no medium wear occurs between the main plunger 34, the plunger push head 31, the cutting ring 32 and the inner circular liner 33, the wear rate of the main plunger 34, the plunger push head 31, the cutting ring 32 and the inner circular liner 33 will increase significantly, and thus the filling rate of the solid plunger pump must be strictly ensured.
[0080] In one embodiment, the length of the feed screw is shortened. This reduces the risk of flocculent material becoming entangled on the spiral reamer. Furthermore, even if entanglement occurs, the flocculent material is easily unwound as the bolt reamer rotates, falling into the solid plunger pump below. Furthermore, the feed screw can be eliminated based on the amount of soft contaminants in the slurry, the amount of soft contaminants entangled in the spiral, and the moisture content and fluidity of the slurry. Eliminating the feed screw effectively prevents the feed screw from becoming entangled with flocculent material, thereby preventing the feed screw from underfeeding.
[0081] In this embodiment, preferably, the pressure value of the mixer is controlled to meet the delivery requirement of the solid plunger pump.
[0082] The slurry material is mixed in the mixer. The mixed material, which is then mixed by the feed screw, is then delivered to the solid plunger pump through the feed port. In one embodiment, controlling the pressure within the mixer can also improve the fill rate of the material in a single pumping. By controlling the pressure range within the mixer, the fill rate of the solid plunger pump can be effectively guaranteed.
[0083] Preferably, the pressure in the mixer is controlled to be 54-72 bar.
[0084] In this embodiment, the main plunger 34 is preferably lubricated.
[0085] like Figure 2 As shown, the main plunger 34 slides with the main plunger seal assembly 4, hydraulically driving the main plunger 34 to reciprocate within the pump chamber. Without lubrication, the main plunger 34 and the main plunger seal assembly 4 will experience severe uneven wear during their relative sliding. This uneven wear can cause the main plunger 34 to shift in center, affecting the concentricity between the main plunger 34 and the inner liner 33, ultimately leading to damage to the cutting ring 32 and other problems.
[0086] Therefore, sufficient lubrication is required between the main plunger 34 and the main plunger seal assembly 4. The main plunger seal assembly 4 is equipped with a lubricating oil filling port, which is connected to an external oil filling connector and communicates with the lubricating oil tank within the main plunger seal assembly 4. During operation of the solid plunger pump, the electric lubrication pump pumps lubricating oil into the main plunger seal assembly 4. This lubricating oil reliably lubricates the contact surface between the main plunger 34 and the main plunger seal assembly 4, thereby reducing wear between the main plunger 34 and the main plunger seal assembly 4.
[0087] Preferably, a program can be set to control the operation of the electric lubrication pump. By adjusting the operating frequency and pumping volume of the electric lubrication pump, the lubrication effect between the main plunger 34 and the main plunger sealing assembly 4 can be reliably guaranteed.
[0088] Preferably, the flowability of the lubricating oil can be ensured by selecting 0# lithium-based grease with good flowability, so as to meet the lubrication requirement of the main plunger 34, and the consumption of the lubricating oil is also required, preferably 4-5 barrels per month, so as to avoid uneven wear of the tail end main plunger sealing assembly 4, plunger center displacement, and cutting ring 32 damage and replacement.
[0089] Before using the method for improving the sealing performance of the solid plunger pump, the relative movement and fixed wear-resistant parts in the pump cavity need to be replaced each time due to wear. According to the maintenance requirement, the main wear parts of the solid plunger pump need to be replaced, including the inner circular bushing 33, the main plunger 34, the cutting ring 32, and all the relative movement and fixed wear-resistant parts in the inner circular bushing 33. The single maintenance replacement cost is high, and the annual maintenance cost is estimated to be 143,600 yuan.
[0090] After using the method for improving the sealing performance of the solid plunger pump, the replacement frequency of the main parts can be reduced, and the replacement of the entire set of relative movement and fixed wear-resistant parts can be avoided by using non-standard push heads, and only the plunger push head 31 needs to be replaced to achieve the running effect. The actual overall maintenance cost of the solid plunger pump is estimated to be 13,600 yuan per year, which can greatly save the maintenance cost.
[0091] Taking a solid plunger pump with a rated pumping capacity of 80 kg as an example, the single pumping capacity of the new pump is about 80 kg, and by using the method for improving the sealing performance of the solid plunger pump, the running cycle is 200 days, the relative movement and fixed wear-resistant parts in the pump cavity are not replaced as a whole, and the single pumping capacity can reach 56 kg-72 kg, and the overall running effect is good.
[0092] The preferred embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, and these simple modifications all belong to the protection scope of the present application.
[0093] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present application.
[0094] In addition, various different embodiments of the present application can also be combined in any manner, as long as they do not deviate from the technical concept of the present application, and they should also be considered as disclosed in the present application.
Claims
1. A method for improving the sealing performance of a solid plunger pump, characterized in that: include: Step 1, detecting the single pumping volume of the solid plunger pump; Step 2: Determine whether to add soft contaminants to the slurry material based on the test results of step 1; Step 3: When it is determined in step 2 that soft contaminants need to be added, add the soft contaminants to the pulp material; Step 4: Based on the detection result of step 1, determine whether to replace the plunger push head (31); Step 5: When it is determined in step 4 that a new plunger push head (31) needs to be replaced, a new plunger push head (31) is manufactured and replaced; Step 6: Repeat steps 1-4 until the cutting ring (32) is worn out.
2. The method for improving the sealing performance of a solid plunger pump according to claim 1, wherein: In step 1, the volume ratio of soft contaminants to the conveyed slurry material is 1:4-1:
5.
3. The method for improving the sealing performance of a solid plunger pump according to claim 2, wherein: The soft contaminants are provided in the form of sheets, with a maximum size not exceeding 10 cm.
4. The method for improving the sealing performance of a solid plunger pump according to claim 1, wherein: In step 3, if the actual measured single pumping volume is less than the set value, a new plunger push head (31) is replaced.
5. The method for improving the sealing performance of a solid plunger pump according to claim 4, characterized in that: In step 3, the actual inner diameter of the cutting ring (32) is measured, and a new plunger push head (31) is manufactured according to the actual inner diameter of the cutting ring (32).
6. The method for improving the sealing performance of a solid plunger pump according to any one of claims 1 to 5, characterized in that: The width of the outer edge step of the plunger push head (31) that matches the cutting ring (32) is increased.
7. The method for improving the sealing performance of a solid plunger pump according to any one of claims 1 to 5, characterized in that: Improve the material filling rate of a single pumping and ensure that the pump cavity is effectively filled with material.
8. The method for improving the sealing performance of a solid plunger pump according to claim 7, characterized in that: The pressure value of the mixer is controlled to meet the delivery requirements of the solid plunger pump.
9. The method for improving the sealing performance of a solid plunger pump according to any one of claims 1 to 5, characterized in that: Lubricate the main plunger (34).