A center water outlet device for a cabinet type piston pump

Abstract

The application relates to the technical field of water outlet devices, in particular to a cabinet type plunger pump center water outlet device which comprises a box body, a filter barrel is arranged in the box body, the filter barrel comprises a barrel body and a first upper cover, a first water inlet is arranged on the surface of the barrel body, the first water inlet is located above a gland, a first water outlet is arranged on the surface of the barrel body, the first water outlet is located below the gland, a waste water discharge port is arranged on the surface of the barrel body, a front filter is arranged in the box body, a water inlet of the front filter is communicated with the first water outlet through a pipeline, a water pump motor assembly is arranged in the box body, the water pump motor assembly comprises a plunger pump and a frequency conversion motor, and the application aims at solving the problem that single-stage filtration needs to undertake the impurity interception task of full-quantity fluid and cannot intercept metal particles generated by friction pairs during plunger pump operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water outlet devices, in particular to a cabinet type plunger pump center water outlet device. BACKGROUND

[0002] The center water outlet device is a special integrated device in the industrial field, mainly used for pressurizing and outputting high-pressure fluid that meets the working condition requirements. Its core function is to raise the fluid pressure through internal components, and finally stably deliver high-pressure fluid to external devices or systems through the output module. This device is suitable for industrial scenes that require high-pressure fluid support, such as equipment cleaning, fluid transmission, pressure operation, etc. By integrating fluid processing and pressure control functions, it provides continuous and reliable high-pressure fluid supply for related industrial processes, ensuring the stability and efficiency of equipment operation.

[0003] The existing center water outlet device generally uses a single-stage filtration system, usually composed of a single filter core or filter screen, directly installed in the water inlet pipeline or pump body inlet. Due to its simple structure and low cost, it is widely used in conventional working conditions. This type of filtration relies on a single precision interception medium and can only perform single-level filtration of impurity particles in the fluid. The structural design often integrates the filtration function into the front end of the pump body or an independent filter component, forming a relatively compact single-stage filtration system. It has certain applicability in scenes with good water quality or low impurity interception requirements. However, single-stage filtration needs to handle the full amount of fluid impurity interception, and the filter core is easily clogged in high-pollution conditions, increasing fluid suction resistance and possibly causing filter core rupture due to excessive pressure difference, leading to direct impurity intrusion into the pump body. More importantly, this filtration method cannot intercept metal particles generated by friction pair wear during plunger pump operation. These internal contaminants can exacerbate component damage and form a vicious cycle, severely affecting system operation stability. SUMMARY

[0004] The purpose of the present application is to provide a cabinet type plunger pump center water outlet device to solve the problem of single-stage filtration needing to handle the full amount of fluid impurity interception and being unable to intercept metal particles generated by friction pair wear during plunger pump operation.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] A cabinet type plunger pump center water outlet device, comprising a box, a filter barrel is installed in the inside of the box, the filter barrel comprises a barrel body and a first upper cover, a first water inlet is arranged on the surface of the barrel body, the first water inlet is above the gland, a first water outlet is arranged on the surface of the barrel body, the first water outlet is below the gland, a waste water outlet is arranged on the surface of the barrel body, a pre-filter is installed in the inside of the box, the water inlet of the pre-filter is communicated with the first water outlet through a pipeline, a water pump motor assembly is installed in the inside of the box, the water pump motor assembly comprises a plunger pump and a variable frequency motor, a second water outlet is arranged on the surface of the plunger pump, a second water inlet is arranged on the surface of the plunger pump, the second water inlet is communicated with the water outlet of the pre-filter through a pipeline, a high-pressure filter is installed in the inside of the box, the water inlet of the high-pressure filter is communicated with the second water outlet through a pipeline, a water outlet transition block is installed in the inside of the box, a check valve is installed on the left surface of the water outlet transition block, a third water outlet is installed at the end of the check valve, a third water inlet is installed at the top end of the water outlet transition block, and the third water inlet is communicated with the water outlet of the high-pressure filter through a pipeline.

[0007] Preferably, the output end of the variable frequency motor is connected with the plunger pump, an oil inlet is arranged on the surface of the plunger pump, an oil window is arranged on the surface of the plunger pump, and a oil outlet is arranged on the surface of the plunger pump.

[0008] Preferably, the first upper cover is detachably connected to the top of the barrel body, a lap joint ring is installed on the inner wall of the barrel body, a gland is lap jointed on the inner ring of the lap joint ring, and a filter cartridge is installed at the bottom end of the gland.

[0009] Preferably, a fixed support is installed on the inner wall of the barrel body, a screw rod is coaxially and rotationally connected to the surface of the fixed support, and the screw rod is coaxially and threadedly connected with the gland.

[0010] Preferably, the high-pressure filter comprises a second cylinder body and a third upper cover, the third upper cover is detachably connected to the top of the second cylinder body, and a transmitter is installed at the top end of the third upper cover.

[0011] Preferably, a diaphragm accumulator is installed at the top of the water outlet transition block, and a pressure sensor is installed at the front end of the water outlet transition block.

[0012] Preferably, a backwater tank opening is installed on the left surface of the water outlet transition block, an overflow valve is installed at the rear end of the water outlet transition block, and the overflow valve is connected with the backwater tank opening.

[0013] Preferably, two electromagnetic single stop valves are installed at the top of the water outlet transition block, and the two electromagnetic single stop valves are respectively located on the liquid filling path and the energy releasing path of the diaphragm accumulator.

[0014] Preferably, the rear end of the water outlet transition block is provided with a throttle valve, which is connected in series between the third water inlet and the water return tank outlet.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1. The water outlet transition block integrates components such as a diaphragm accumulator, a pressure sensor, a check valve, and an overflow valve, and is connected through internal flow channels to reduce external pipeline nodes, reduce the risk of leakage, and facilitate overall hoisting and transportation. The diaphragm accumulator absorbs the pressure pulsation generated by the reciprocating motion of the plunger pump, so that the water outlet pressure fluctuation amplitude is ≤±0.2 MPa, and the instantaneous flow demand is compensated, reducing the frequent start-stop of the pump and improving the system efficiency.

[0017] 2. The filter barrel first intercepts large particle impurities, and the pre-filter further filters fine particles, reducing the wear of the plunger pump friction pair, prolonging the service life of the pump body compared with traditional design, and the high-pressure filter is designed at the rear to intercept metal particles generated by wear in the pump, ensuring that the particle contamination of the water outlet meets the requirements of precision working conditions, avoiding nozzle blockage or actuator jamming, and the frequency conversion motor adjusts the speed according to actual demand, saving energy compared with traditional fixed-frequency pumps, and the overflow valve returns water through the water return tank outlet to circulate to the water tank, avoiding water resource waste.

[0018] 3. The cabinet-type rigid structure is closed as a whole by a lock buckle, facilitating forklift or crane handling, and does not require complex alignment during installation, suitable for container transportation and on-site rapid deployment, and the filter barrel supports auxiliary water pump reverse backwashing without additional backwashing pump, and the filter cartridge is flushed in reverse through the wastewater outlet, reducing the frequency of manual disassembly and washing, and reducing maintenance costs. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a front view of the central water outlet device of the present application;

[0020] Figure 2 is an exploded view of the central water outlet device of the present application;

[0021] Figure 3 is a structural schematic view of the filter barrel of the present application;

[0022] Figure 4 is a sectional view of the filter barrel of the present application;

[0023] Figure 5 is a structural schematic view of the pre-filter of the present application;

[0024] Figure 6 is a structural schematic view of the water pump motor assembly of the present application;

[0025] Figure 7 is a structural schematic view of the high-pressure filter of the present application;

[0026] Figure 8 Front view structure schematic diagram of the water outlet transition block of the present application;

[0027] Figure 9 Rear view structure schematic diagram of the water outlet transition block of the present application;

[0028] Figure 10 Principle diagram of the central water outlet of the present application.

[0029] In the figure: 1, box body; 2, distribution box; 3, filter barrel; 4, pre-filter; 5, plunger pump; 6, variable frequency motor; 7, high-pressure filter; 8, water outlet transition block; 9, control panel; 10, barrel body; 11, first upper cover; 12, filter pressure gauge joint; 13, first water inlet; 14, first water outlet; 15, waste water discharge port; 16, fixed support; 17, screw rod; 18, lap joint ring; 19, gland; 20, filter cartridge; 21, first cylinder body; 22, second upper cover; 23, second water outlet; 24, second water inlet; 25, oil filling port; 26, oil window; 27, oil drain port; 28, transmitter; 29, second cylinder body; 30, third upper cover; 31, diaphragm accumulator; 32, third water inlet; 33, water outlet pressure gauge joint; 34, pressure sensor; 35, backwater tank port; 36, check valve; 37, third water outlet; 38, electromagnetic single stop valve; 39, throttle valve; 40, overflow valve; 41, auxiliary water pump; 42, fourth water inlet; 43, fourth water outlet; 44, fifth water outlet; 45, fifth water inlet. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0031] Please refer to Figures 1 to 10 , the present application provides a technical solution.

[0032] The utility model provides a cabinet type plunger pump center water outlet device, including box 1, the top of box 1 is installed with distribution box 2, and the distribution box 2 is connected with the distribution box 2 through the hinge, can open the inside of box 1 by turning over, the surface of distribution box 2 is installed with control panel 9, and the distribution box 2 is connected through the hinge, can be opened by 180 ° turning over, makes the inside component of box 1 completely exposed, can be overhauled without dismantling the whole device, and maintenance space expands, simultaneously avoids the dismantling time consumption of traditional bolt fixed structure, the side of distribution box 2 is provided with heat dissipation air window, is favorable to hot air natural rising, forms convection channel, makes inside heat dissipation, and the control panel 9 installed on the surface of distribution box 2 adopts sealing rubber strip and embedded design, and the protection level can reach IP55, can resist high-pressure water splash and dust invasion, meets the use requirement of industrial environment, and the control panel 9 is integrated on the surface of distribution box 2, and the parameters such as pressure, flow, temperature are displayed, and this design reduces the complexity of external wiring, and the box 1 connected through the hinge is fixed through the lock catch in the closed state, forms integral rigid structure, and the cabinet type structure is convenient for integral hoisting and transportation.

[0033] The inside of box 1 is installed with filter barrel 3, and the filter barrel 3 is connected with auxiliary water pump 41 through pipeline, and the water flow is transported to filter barrel 3 through auxiliary water pump 41, and the filter barrel 3 includes barrel body 10 and first upper cover 11, and the first upper cover 11 is detachably connected to the top of barrel body 10, which is beneficial to open and clean or replace the filter cartridge 20 in the barrel body 10, the inner wall of barrel body 10 is installed with lap joint ring 18, the inner ring of lap joint ring 18 is lapped with gland 19, the inner wall of barrel body 10 is installed with fixed support 16, the surface of fixed support 16 is coaxially rotatably connected with screw rod 17, and the screw rod 17 is coaxially screwed with the gland 19, and the screw rod 17 is used to fix the gland 19, the bottom end of the gland 19 is installed with the filter cartridge 20, the surface of barrel body 10 is provided with first water inlet 13, and the first water inlet 13 is located above the gland 19, the surface of barrel body 10 is provided with first water outlet 14, and the first water outlet 14 is located below the gland 19, the surface of barrel body 10 is provided with waste water discharge outlet 15, and the waste water discharge outlet 15 is used to drain waste water, when the water in the water outlet device needs to be extracted, it can be extracted from the waste water discharge outlet 15, and the surface of first upper cover 11 is provided with filter pressure gauge joint 12.

[0034] The first upper cover 11 is connected with the barrel body 10 by bolts or buckles, and the filter cartridge 20 can be replaced within 5 minutes. The coaxial threaded connection between the gland 19 and the screw rod 17 does not require special tools, and the tightening and release of the filter cartridge 20 can be realized by using a common wrench, which conforms to the ergonomic design. The silicon rubber sealing ring is used between the barrel body 10 and the first upper cover 11, and the pre-tightening force of the bolts can withstand a working pressure of more than 15 MPa. The O-ring is arranged at the interface between the gland 19 and the filter cartridge 20 to prevent fluid bypassing during filtration. The coaxial design of the fixed support 16 and the screw rod 17 ensures that the gland 19 is uniformly stressed, thereby avoiding deformation of the filter cartridge 20 due to local stress concentration. This is significantly superior to the traditional cantilever fixing structure. The filter pressure gauge joint 12 of the first upper cover 11 can be installed with a pressure gauge.

[0035] The pre-filter 4 is installed inside the box body 1. The water inlet of the pre-filter 4 is connected with the first water outlet 14 through a pipeline. The water inlet of the pre-filter 4 is the fourth water inlet 42. The pre-filter 4 includes a first cylinder body 21 and a second upper cover 22. The second upper cover 22 is detachably connected to the top end of the first cylinder body 21, which is conducive to opening and cleaning or replacing the filter screen in the first cylinder body 21.

[0036] The pre-filter 4 and the filter barrel 3 form a two-stage filtration system to achieve staged interception of fluid impurities. The filter barrel 3 intercepts large-particle impurities such as metal debris and welding slag with a size of more than 50 μm through the filter cartridge 20, thereby reducing the load of the pre-filter 4. The pre-filter 4 uses a higher-precision filter screen such as 10-25 μm to further filter fine particles such as colloids and rust. This combined filtration can reduce the wear of the plunger. The second upper cover 22 is connected with the first cylinder body 21 by bolts or buckles, and the guide groove design can complete the filter screen replacement within 3 minutes. The water inlet of the pre-filter 4 is directly connected with the first water outlet 14 of the filter barrel 3.

[0037] A water pump motor assembly is installed inside the box body 1. The water pump motor assembly includes a plunger pump 5 and a variable frequency motor 6. The output end of the variable frequency motor 6 is connected with the plunger pump 5. The surface of the plunger pump 5 is provided with a second water outlet 23. The surface of the plunger pump 5 is provided with a second water inlet 24. The second water inlet 24 is connected with the water outlet of the pre-filter 4 through a pipeline. The water outlet of the pre-filter 4 is the fourth water outlet 43. The surface of the plunger pump 5 is provided with an oil inlet 25. The surface of the plunger pump 5 is provided with an oil window 26. The surface of the plunger pump 5 is provided with an oil drain 27.

[0038] The variable frequency motor 6 realizes linear adjustment of the flow of the plunger pump 5 by adjusting the output rotating speed. The current is limited within 1.5 times of the rated value during variable frequency starting, avoiding the damage of the current impact of 5-7 times of the rated value to the motor winding and the sealing element of the plunger pump 5, prolonging the service life of the equipment. The output shaft of the variable frequency motor 6 is connected with the input shaft of the plunger pump 5, and the coaxial error is less than or equal to 0.05 mm. The shock absorbing foot pad with a Shore hardness of 60±5A is matched, the running vibration amplitude is controlled within 0.15 mm, the abnormal wear of the bearing caused by eccentricity is prevented, the water outlet of the pre-filter 4 is directly communicated with the second water inlet 24 of the plunger pump 5, forming a closed loop from filtering to pumping, the wear of the friction pair of the plunger pump 5 is reduced after the fluid is filtered by the pre-filter 4, the pipe diameter of the second water inlet 24 is 1-2 specifications larger than that of the second water outlet 23, for example, the second water outlet 23 is DN20 and the second water inlet 24 is DN25, the fluid suction flow rate is reduced, the flow guide groove inside the pump body is matched, the net positive suction head is greater than or equal to 3.5 m, meeting the anti-cavitation requirement of the plunger pump 5 in the API610 standard, the variable frequency driving technology is adopted, the actual load demand is matched by real-time adjustment of the motor rotating speed, the waste of electric energy caused by the constant pressure overflow of the traditional central water outlet system is avoided, the comprehensive energy saving effect is more than 50%, the long-term use can significantly reduce the electricity cost of enterprises, realizing the double improvement of economic benefit and environmental benefit, the exhaust hole is reserved at the highest position of the pump body, the air in the suction pipeline is discharged through the manual exhaust valve before starting, the pitting corrosion of the plunger surface caused by cavitation is avoided, the transparent oil window 26 is made of high-pressure resistant organic glass, the oil level can be directly observed whether it is within the scale line range, the oil shortage is avoided to cause the bearing temperature rise to exceed the threshold value, the oil filler port 25 is provided with a magnetic dust cover, and a 100-mesh filter screen is arranged inside, to prevent impurities from being mixed in the oiling process, when the oil leakage suddenly increases, for example, more than 20 mL / h, it can be judged that the sealing element is worn or the cylinder body is cracked, the fault early warning is realized by matching the flow sensor, compared with the traditional manual inspection, the problem can be found 24 hours in advance, when the equipment is maintained, the old oil can be quickly discharged through the oil drain port 27, the discharge time is shorter than that of the traditional oil drain plug, the oil tank bottom is designed to be inclined by 15°, so that the residual amount of the old oil is less than or equal to 5%, when the pump outlet pressure exceeds 110% of the rated value, the bypass valve of the oil drain port 27 is set to 35 MPa, and the automatic opening is realized, part of the oil flows back to the oil tank, the system pressure is reduced, at the same time, the frequency converter receives the pressure signal and starts the frequency reduction protection, forming double overload protection, the oil filler port 25 adopts a quick plug interface, avoiding the oil overflow problem of the traditional threaded interface.

[0039] The high-pressure filter 7 is installed in the inside of the tank body 1, the water inlet of the high-pressure filter 7 is communicated with the second water outlet 23 through a pipeline, the water inlet of the high-pressure filter 7 is a fifth water inlet 45, the high-pressure filter 7 comprises a second cylinder body 29 and a third upper cover 30, the third upper cover 30 is detachably connected to the top of the second cylinder body 29, which is beneficial to open and clean or replace the filter screen in the second cylinder body 29, and the top end of the third upper cover 30 is installed with a annunciator 28.

[0040] The second cylinder 29 is detachably connected with the third upper cover 30, allowing the user to directly open the cylinder, take out the filter screen for cleaning or replacement, without the need to disassemble the entire pipeline system, reducing the complexity of maintenance, which conforms to the principle of "easy maintenance" of industrial equipment. The transmitter 28 is installed at the top end of the third upper cover 30, which is a differential pressure transmitter. Its principle is to monitor the pressure difference between the inlet and outlet of the high-pressure filter 7. When the filter screen is blocked, the pressure difference between the inlet and outlet will exceed the set threshold, and the transmitter 28 will send an electrical signal to remind the user to clean or replace the filter screen in time. This design avoids the omissions of manual inspection, especially in unattended or complex systems, which can prevent the high-pressure filter 7 from being damaged due to excessive pressure difference caused by excessive blockage of the filter screen. The core function of the rear-mounted high-pressure filter is to intercept impurities generated in the pump, ensuring the cleanliness of the water outlet. When the plunger pump 5 is running at high pressure, the friction pairs such as the plunger and the cylinder hole, the flow distribution valve, etc. may generate metal particles such as iron filings and aluminum oxide particles due to wear. Even if the pre-filter has removed impurities from the water source, the pump body itself may still contaminate the fluid. The high-pressure filter 7 intercepts these wear products at this point, ensuring that the particle contamination of the final water outlet meets the requirements of precision working conditions. The water outlet transition block 8 is usually connected to the high-pressure pipeline, nozzle or actuator. If the fluid contains pump wear particles, it may cause nozzle blockage. The rear-mounted design of the high-pressure filter 7 can reduce these risks. The second cylinder 29 directly bears the outlet pressure of the plunger pump 5, so it is made of forged stainless steel, such as 316L. The third upper cover 30 and the cylinder use a metal wrapped gasket and bolt pre-tightening structure, which, combined with the hydraulic bulging process, ensures that the sealing surface flatness is ≤0.02mm, and there is no leakage in the 30MPa pressure cycle test, with a test frequency of ≥100,000 times. The deep function of the transmitter 28: The transmitter 28 monitors the pressure difference between the inlet and outlet of the high-pressure filter 7. Its abnormal fluctuation can reflect two potential problems. One is filter screen blockage. The normal operating pressure difference is ≤0.5MPa. If it exceeds 1.0MPa, the transmitter 28 will alarm, prompting the user to clean the filter screen. The second is abnormal wear of the pump body. If the filter screen is clean but the pressure difference suddenly rises, such as from 0.3MPa to 0.8MPa, it indicates that the plunger seal is damaged or the cylinder hole is rough, causing a sharp increase in metal particles. At this time, the transmitter 28 signal can serve as an early warning of pump body failure, 12-24 hours earlier than the vibration sensor in detecting abnormalities. The ratio of the flow area of the high-pressure filter 7 to the pipe diameter of the second water outlet 23 of the plunger pump 5 is ≥2:1, such as DN20 outlet and DN40 inner diameter of the high-pressure filter 7, so that the fluid flow rate is ≤2m / s, and the along-the-way pressure loss is controlled within 0.3MPa. The inner wall of the cylinder is provided with four symmetrical guide vanes to reduce the rotational flow rate of the fluid and prevent the filter screen from being partially blocked due to uneven flow, thereby improving the uniformity of the pressure difference.

[0041] The inside of the box 1 is provided with a water outlet transition block 8, the surface of which is provided with a water outlet pressure gauge joint 33, the top of which is provided with a diaphragm accumulator 31, the front end of which is provided with a pressure sensor 34, the left side surface of which is provided with a check valve 36, the end of which is provided with a third water outlet 37, which is located on the outside of the box 1, the left side surface of which is provided with a backwater tank opening 35, the top of which is provided with two electromagnetic single check valves 38, the rear end of which is provided with a throttle valve 39, the rear end of which is provided with an overflow valve 40, and the top end of which is provided with a third water inlet 32, which is communicated with the water outlet of the high-pressure filter 7 through a pipeline, and the water outlet of the high-pressure filter 7 is a fifth water outlet 44.

[0042] The overflow valve 40 is connected with the backwater tank opening 35, the inlet of the overflow valve 40 is communicated with the main path of the third water inlet 32 to the third water outlet 37 through the internal passage of the transition block, the outlet is directly connected with the backwater tank opening 35, forming an independent drainage branch, when the pressure of the water flow main path exceeds the set value of the overflow valve 40, the valve core opens, the high-pressure water flows out of the overflow valve 40 to the backwater tank opening 35, and then flows to the water tank through the pipeline, avoiding system overpressure damage, the overflow valve 40 and the backwater tank opening 35 form a combination of pressure safety valve and backflow channel, ensuring the stability of the system pressure, and at the same time, the backflow to the water tank realizes the recycling of water resources.

[0043] The throttle valve 39 is connected in series between the third water inlet 32 and the backwater tank opening 35, by adjusting the opening degree of the throttle valve 39, the water flow of the main path is controlled, for example, reducing the opening degree of the throttle valve 39 can reduce the water outlet flow, cooperating with the overflow valve 40, after the throttle valve 39 adjusts the flow, the overflow valve 40 can respond to the pressure change in real time, and the two cooperate to realize the double control of flow and pressure.

[0044] The two electromagnetic single stop valves 38 are arranged in different functional branches, the first one connects the liquid filling path of the diaphragm accumulator 31, the inlet connects the main path, and the outlet connects the liquid filling port of the diaphragm accumulator 31, and the second one connects the energy release path of the diaphragm accumulator 31, the inlet connects the liquid outlet of the diaphragm accumulator 31, and the outlet connects the main path. The electromagnetic single stop valve 38 and the throttle valve 39 form an impact suppression combination: when the electromagnetic single stop valve 38 is powered on, the throttle valve 39 synchronously increases the opening degree, and the high-pressure water impact in the moment is buffered through the adjustment flow channel; when the electromagnetic single stop valve 38 is powered off, the throttle valve 39 immediately reduces the opening degree, and the water hammer effect generated by the fluid inertia of the main path is attenuated. This linkage mechanism reduces the pressure fluctuation amplitude when the electromagnetic single stop valve 38 is opened and closed. When powered on, the valve is opened to allow water flow, and when powered off, it prevents backflow and controls the pressure relief of the diaphragm accumulator 31. When the system pressure is insufficient, the pressure sensor 34 detects that the main path pressure is lower than the set threshold, triggers the second electromagnetic single stop valve 38 to be powered on, and makes the energy release path in an open state. The high-pressure water stored in the diaphragm accumulator 31 flows to the main path through the check valve, supplements the pressure, stabilizes the output, and the main function of the diaphragm accumulator 31 is to buffer pressure fluctuations and compensate for instantaneous flow. Its liquid filling process usually relies on the high-pressure water flowing into the diaphragm accumulator 31 when the system is working normally, and its energy release process is started when the system pressure drops suddenly. The role of the electromagnetic single stop valve 38 is to actively control the working state of the diaphragm accumulator 31, rather than relying entirely on pressure self-balancing, which is particularly important in systems that require precise pressure control.

[0045] The one-way flow characteristic of the electromagnetic single stop valve 38 can prevent the main water flow from flowing back to the diaphragm accumulator 31 or the control branch, protect other components, integrate fluid control logic into the water outlet transition block 8, and improve the reliability and maintainability of the system through modular connection.

[0046] The plunger pump 5 is prone to pressure pulsation due to the reciprocating movement of the plunger during operation. The diaphragm accumulator 31 can absorb the fluctuation to avoid the impact of sudden pressure rise and fall on the pipeline and valve, ensuring stable water outlet pressure. When the pump output flow fluctuates, the diaphragm accumulator 31 releases the stored pressure energy to meet the instantaneous flow demand, reducing the frequent start and stop of the pump, improving system efficiency and reducing energy consumption. The pressure sensor 34 monitors the pressure value in the water outlet transition block 8 and transmits the signal to the control system, such as PLC, to realize dynamic adjustment of the speed of the frequency conversion motor 6 or the output power of the plunger pump 5, ensuring that the pressure is maintained within the set range. When the pressure exceeds the threshold value, the pressure sensor 34 triggers an alarm or the overflow valve 40 is activated to prevent system overpressure damage. The check valve 36 prevents backflow to avoid high-pressure water flowing back to the pump or filter, protecting the seal of the plunger pump 5 and the filter screen of the high-pressure filter 7, preventing water pressure impact or impurities from flowing back due to backflow. The treated high-pressure water is stably delivered to external equipment through the third water outlet 37, which is designed on the outside of the box 1 for easy pipeline connection and system integration. When the system pressure is too high, the overflow valve 40 is opened, and the excess water flows back to the water tank through the backwater tank opening 35, forming a circulating loop to avoid water waste. At the same time, when the system is shut down, the backwater tank opening 35 can release residual pressure to ensure maintenance safety. The third water inlet 32 is connected to the high-pressure filter 7, allowing clean high-pressure water after filtration to enter the water outlet transition block 8, where comprehensive treatment such as pressure, flow, and safety protection is completed before output, ensuring water quality and system reliability. The water outlet transition block 8 integrates multiple functional components, reducing pipeline connection nodes and leakage risks, while facilitating installation, maintenance, and improving the compactness and maintainability of the overall system.

[0047] The specific scheme is: open the water inlet pipeline valve, the water flows into the filter barrel 3 through the auxiliary water pump 41, at this time the auxiliary water pump 41 runs forward, the water flows into the barrel body 10 from the first water inlet 13, and after being filtered by the filter cartridge 20, it flows out from the first water outlet 14, preliminarily intercepting impurities with a particle size of 50 microns or more, and then the water flows into the pre-filter 4, and is further filtered by a 10-25 micron precision filter screen to remove fine particles such as colloids and rust, reducing the risk of piston pump 5 wear, the water filtered by the pre-filter 4 flows into the second water inlet 24 of the piston pump 5 through the pipeline, the variable frequency motor 6 drives the piston pump 5 to operate, and converts the low-pressure water flow into a high-pressure fluid, the high-pressure water outlet of the piston pump 5 flows out from the second water outlet 23, enters the high-pressure filter 7, intercepts metal particles generated by the friction pair in the pump, ensures the cleanliness of the water outlet, and the control panel 9 sets the target pressure and flow. The variable frequency motor 6 realizes linear change of the piston pump 5 flow by adjusting the speed, the starting current is limited within 1.5 times of the rated value, the impact is reduced, the water flows into the water outlet transition block 8 after passing through the high-pressure filter 7, and the throttle valve 39 adjusts the main path flow; when the system pressure exceeds the set value of the overflow valve 40, the overflow valve 40 is opened, the excess water flows back to the water tank through the backwater tank opening 35, forming pressure relief protection, when the system pressure is insufficient, the pressure sensor 34 triggers the electromagnetic single check valve 38 to open, the diaphragm accumulator 31 releases high-pressure water to supplement the main path flow, and the check valve 36 prevents the high-pressure water at the water outlet from flowing back, protecting the pump body and the filter. The water flows through the third water outlet 37 to the external equipment, the outlet pressure is monitored in real time by the pressure sensor 34 and fed back to the control panel 9, realizing closed-loop regulation, through the closed-loop pressure control algorithm, the system can automatically compensate for flow fluctuations, ensuring that the water outlet pressure fluctuation range is less than ±0.2MPa, meeting the high-precision machining requirements. At the same time, the variable frequency technology greatly reduces the operating noise of the motor and pump set, which is more than 20dB lower than that of the traditional central water outlet system, creating a more comfortable production environment. The processing efficiency under 70BAR pressure is more than 30% higher than that under traditional 30BAR pressure, when stopping, first close the water inlet valve, and release the residual pressure in the system through the backwater tank opening 35; the oil drain opening 27 is used for discharging old oil, and the residual amount is ≤5%, the device realizes automatic control of the whole process from water inlet filtration, high-pressure pumping, pressure stabilization to safe output, has the characteristics of high-efficiency filtration precision, wide pressure adjustment and convenient maintenance, can detect load changes in real time, dynamically adjust output pressure, and automatically adapt to pressure without manual intervention. Then the user can intuitively set the pressure parameters through the touch screen and accurately adjust them through the PLC panel, supporting 0.1MPa level precision adjustment, which is simple and efficient. For complex machining processes, multiple pressure curves can be preset, and the machine tool PLC is linked to realize automatic switching of pressure values, adapt to drilling, tapping, cooling, filtering and other multi-process requirements, and is suitable for high-pressure cleaning, industrial fluid conveying and other scenes.

[0048] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A cabinet-type plunger pump center outlet device, comprising a housing (1), characterized in that: The housing (1) is equipped with a filter barrel (3), which includes a barrel body (10) and a first cover (11). The surface of the barrel body (10) is provided with a first water inlet (13), which is located above the cover (19). The surface of the barrel body (10) is provided with a first water outlet (14), which is located below the cover (19). The surface of the barrel body (10) is provided with a wastewater discharge outlet (15). The housing (1) is equipped with a pre-filter (4), whose inlet is connected to the first water outlet (14) via a pipe. The housing (1) is equipped with a water pump motor assembly, which includes a plunger pump (5) and a variable frequency motor (6). The plunger pump (5) has a second outlet (23) on its surface and a second inlet (24) on its surface. The second inlet (24) is connected to the outlet of the pre-filter (4) through a pipe. The housing (1) is equipped with a high-pressure filter (7). The inlet of the high-pressure filter (7) is connected to the second outlet (23) through a pipe. The housing (1) is equipped with an outlet transition block (8). A check valve (36) is installed on the left side surface of the outlet transition block (8). A third outlet (37) is installed at the end of the check valve (36). A third inlet (32) is installed at the top of the outlet transition block (8). The third inlet (32) is connected to the outlet of the high-pressure filter (7) through a pipe. The first top cover (11) is detachably connected to the top of the barrel (10). An overlapping ring (18) is installed on the inner wall of the barrel (10). A pressure cap (19) overlaps the inner ring of the overlapping ring (18). A filter cylinder (20) is installed at the bottom of the pressure cap (19). The inner wall of the barrel (10) is equipped with a fixed bracket (16), and a screw (17) is coaxially rotatably connected to the surface of the fixed bracket (16). The screw (17) and the pressure cap (19) are coaxially threaded. A diaphragm accumulator (31) is installed on the top of the water outlet transition block (8), and a pressure sensor (34) is installed at the front end of the water outlet transition block (8). Two electromagnetic check valves (38) are installed on the top of the water outlet transition block (8). The two electromagnetic check valves (38) are located in the filling path and the energy release path of the diaphragm accumulator (31), respectively. The pressure sensor (34) is electrically connected to the variable frequency motor (6) and the electromagnetic check valve (38) to form a pressure closed-loop control. The water outlet transition block (8) has a return water tank inlet (35) installed on its left side surface, and an overflow valve (40) is installed at the rear end of the water outlet transition block (8). The overflow valve (40) is connected to the return water tank inlet (35). A throttle valve (39) is installed at the rear end of the water outlet transition block (8). The throttle valve (39) is connected in series between the third water inlet (32) and the return water tank inlet (35). The two electromagnetic check valves (38) are linked with the throttle valve (39) to attenuate the water hammer effect of the water flow impact.

2. The cabinet-type plunger pump center outlet device according to claim 1, characterized in that, The output end of the variable frequency motor (6) is connected to the plunger pump (5). The plunger pump (5) has an oil filler port (25), an oil window (26), and an oil drain port (27).

3. The cabinet-type plunger pump center outlet device according to claim 1, characterized in that, The high-pressure filter (7) includes a second cylinder (29) and a third top cover (30). The third top cover (30) is detachably connected to the top of the second cylinder (29), and a transmitter (28) is installed on the top of the third top cover (30).

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