Combinable pump set oil source system

Abstract

The invention provides a combinable pump set oil source system, and relates to the technical field of mechanical testing. The combinable pump set oil source system comprises pump set units, a hydraulic control unit and an oil tank, the pump set units provide a power driving source for the whole system, the number of the pump set units can be combined according to the total flow requirement of the oil source, and the pump set units can be combined into different flow specifications. By means of the modularized combinable pump set oil source system, standardization and flexibility of oil source design are remarkably improved. The pump set units of the unified specification are adopted, free splicing according to needs is supported so as to linearly expand the flow, the diversified test requirements from low to high are met, and repeated customization development is avoided. And the design and production process are greatly simplified through standardized parts, and the part management difficulty and the inventory cost are reduced. The system supports dynamic increase and decrease of units and online fault switching, a user can quickly adjust configuration or maintenance, the transformation period is shortened, and the response efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical testing, and particularly to a combinable pump unit oil source system. Background Art

[0002] An oil source system, also known as a hydraulic oil source system or a hydraulic power source, is a device that provides power for hydraulic equipment or a hydraulic system. It converts mechanical energy into hydraulic energy to provide the required high-pressure oil for hydraulic actuators (such as hydraulic cylinders, hydraulic motors, etc.) to achieve the movement and control of the equipment. The oil source system is the core part of the hydraulic system and is widely used in industries, machinery, aerospace, automobiles, and other fields.

[0003] The existing patent (Publication No.: CN119042173A) discloses "The present invention discloses a hydraulic component pressure pulse test circuit, including an oil tank, a driving component, and a check valve. The oil tank, the driving component, and the check valve are connected in sequence. The hydraulic oil in the oil tank is transported to the check valve through the driving component. It is characterized in that it further includes a primary oil source and a secondary oil source. The primary oil source is connected to the check valve, and the hydraulic oil continuously supplies oil to the primary oil source through the check valve. The primary oil source is cooperatively connected to the secondary oil source, and a hydraulic pump and the primary oil source jointly supply oil to the secondary oil source. The secondary oil source is connected to the test piece, and the secondary oil source supplies oil to the test piece. This solution adopts two-stage oil sources. Among them, the primary oil source supplies oil to the secondary oil source, and the secondary oil source supplies oil to the test piece; due to the function of the accumulator in the primary oil source, the flow rate of supplying oil to the secondary oil source is increased, the displacement specification of the hydraulic pump is reduced, the pressure change range of the primary oil source is smaller and relatively gentle, and the loss of the hydraulic pump is reduced."

[0004] In the process of implementing the present application, the inventor found that currently, electro-hydraulic servo fatigue testing machines rely on customized oil source systems to provide hydraulic power, and their flow rate requirements vary significantly with parameters such as test load and frequency. For example, a small fatigue testing machine may only require a flow rate of 100 L / min, while a large fatigue testing machine requires more than 600 L / min. To cover different user scenarios, it is necessary to separately design oil sources for each flow rate specification, including differential development of pump group selection, valve block layout, pipeline connection, and control logic. Although such customized solutions can meet the requirements of specific working conditions, their core components (such as oil pumps, motors, oil tanks) and system architectures lack generality, resulting in a complex product line, a long development cycle, and limited adaptation flexibility.

[0005] The prior art has problems of lack of standardization and resource waste. For each oil source with a specific flow rate specification, independent structural design, component selection, and process verification are required, resulting in a high rate of repeated drawing of drawings and low design efficiency. At the same time, the proportion of non-standard components is too high, exacerbating the material management difficulty and inventory cost at the production end. When user requirements change, system expansion or downgrading requires re-design, and the transformation cycle is as long as several weeks, making it difficult to quickly respond to the market. In addition, the decentralized development model makes it difficult to reuse technical experience, the quality control consistency of similar products is poor, and the maintenance cost climbs, seriously restricting the large-scale development of the industry. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a combinable pump group oil source system. Through modular architecture design, the oil source is disassembled into standardized pump group units (including pumps, motors, valve groups, and interfaces), which supports freely splicing the number of units according to the user's flow rate requirements to achieve linear flow expansion. The unified core component specifications and interface protocols increase the reuse rate in the design, production, and maintenance links by more than 80%, significantly shortening the delivery cycle. This system is compatible with functions such as dynamically adding or reducing units and online fault switching, while reducing R & D costs and inventory pressure, giving users an efficient oil use experience of "configuring according to demand and iterating flexibly".

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A combinable pump group oil source system, including a pump group unit, a hydraulic control unit, and a fuel tank. The pump group unit provides the power drive source for the overall system. The number of pump group units can be combined according to the total flow rate requirement of the oil source to form different flow rate specifications. The hydraulic control unit is used to control the working state of the overall system, and the fuel tank is used to hold the hydraulic oil required by the system.

[0008] Preferably, the pump group unit includes a main oil pump, a motor, a cooling oil pump, a first one-way valve, a first overflow valve, a solenoid valve, and a second one-way valve.

[0009] Preferably, the main oil pump is used to output the hydraulic oil in the fuel tank as high-pressure oil, and the motor is used to drive the main oil pump and the cooling oil pump to provide the power source for both.

[0010] Preferably, the cooling oil pump is used to cool and circulate the hydraulic oil in the fuel tank, and the first one-way valve is used to control the circulation direction of the hydraulic oil to prevent backflow.

[0011] Preferably, the first overflow valve is used to control the output pressure value of the hydraulic oil, and the solenoid valve is used to unload the output pressure of the hydraulic oil.

[0012] Preferably, the second one-way valve is used to control the outflow direction of the hydraulic oil to prevent the hydraulic oil from flowing between the pump groups.

[0013] Preferably, the hydraulic control unit includes a small-flow solenoid valve, a large-flow solenoid valve, a high-pressure filter, a second overflow valve, a cooler, an electromagnetic water valve, a third check valve, a return oil filter, an accumulator, a pressure sensor, a high-pressure pressure gauge, and a low-pressure pressure gauge.

[0014] Preferably, the small-flow solenoid valve and the large-flow solenoid valve cooperate to discharge the pressure of the high oil outlet channel. The high-pressure filter is used to filter out impurities in the hydraulic oil. The second overflow valve is used to control the pressure value after the multi-pump units are aggregated.

[0015] Preferably, the cooler is used to cool the hydraulic oil. The electromagnetic water valve is used to control the inflow and outflow of cold water in the cooler. The third check valve is used to slow down the return oil pressure. The return oil filter is used to filter out impurities in the returned hydraulic oil.

[0016] Preferably, the accumulator is used to absorb the pulse fluctuation of the pressure to make the pressure more stable. The pressure sensor is used to monitor the pressure value. The high-pressure pressure gauge and the low-pressure pressure gauge are used to measure the pressure values of the high-pressure oil outlet channel and the low-pressure return oil channel.

[0017] Working principle: The fuel tank stores hydraulic oil to provide oil for the system. The main oil pump of each pump unit is driven by an electric motor to extract hydraulic oil from the fuel tank and output high-pressure oil through the second check valve. The cooling oil pump is also driven by an electric motor to extract hydraulic oil and enter the return oil channel through the first check valve for cooling the system. The high-pressure oil output by the main oil pump enters the hydraulic control unit through the second check valve. The first overflow valve is used to adjust the pressure of the oil to ensure the stability of the system pressure. The solenoid valve is used to control the on-off of the oil to realize the unloading function of the system. The high-pressure oil enters the hydraulic control unit. First, the system pressure is adjusted by the second overflow valve. After the high-pressure oil is filtered by the high-pressure filter to remove impurities, it enters the high-pressure channel and enters the hydraulic equipment through the P1 and P2 interfaces. The oil after being used by the hydraulic equipment returns to the hydraulic control unit through the T1 and T2 interfaces and enters the low-pressure channel. The oil in the return oil channel is first cooled by the cooler. The cooling water of the cooler is controlled by the electromagnetic water valve, and the on-off of the cooling water is automatically adjusted according to the oil temperature. After the cooled oil is filtered by the return oil filter to remove impurities, it returns to the fuel tank. If the return oil pressure is too high, the oil will bypass through the check valve in the return oil bypass channel to avoid damage to the cooler. The pressure sensor monitors the oil pressure in real time and feeds the data back to the control system. The high-pressure pressure gauge and the low-pressure pressure gauge respectively display the pressure values of the high-pressure channel and the low-pressure channel, facilitating the operator to monitor the system status. The small-flow solenoid valve and the large-flow solenoid valve are used to control the flow rate of the high-pressure oil to realize the pressure adjustment and unloading functions of the system. The accumulator is connected to the high-pressure oil channel to absorb the pressure fluctuation and ensure the stability of the system pressure.

[0018] The present invention provides a combinable pump unit oil source system, which has the following beneficial effects:

[0019] 1. The present invention provides a combinable pump unit oil source system. Compared with the existing oil source systems, this oil source system, through the modular combinable pump unit oil source system, significantly improves the standardization and flexibility of oil source design. By adopting pump unit modules of unified specifications, it supports free splicing as required to linearly expand the flow rate, covering diverse test requirements from low to high, and avoiding repeated customized development. Standardized components greatly simplify the design and production processes, reduce the difficulty of component management and inventory costs. The system supports dynamic addition and subtraction of units and online fault switching. Users can quickly adjust the configuration or perform maintenance, shortening the transformation cycle and improving the response efficiency. At the same time, the modular architecture promotes technology reuse and quality control, enhances product consistency, and provides an efficient and economical solution for the large-scale development of the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the general schematic diagram of the hydraulic principle of the present invention;

[0021] Figure 2 is the schematic diagram of the hydraulic principle of the pump unit of the present invention;

[0022] Figure 3 is the schematic diagram of the hydraulic principle of the hydraulic control unit of the present invention.

[0023] Among them, 1. Pump unit; 2. Hydraulic control unit; 3. Oil tank; 101. Main oil pump; 102. Motor; 103. Cooling oil pump; 104. First check valve; 105. First relief valve; 106. Solenoid valve; 107. Second check valve; 201. Small flow solenoid valve; 202. Large flow solenoid valve; 203. High-pressure filter; 204. Second relief valve; 205. Cooler; 206. Electromagnetic water valve; 207. Third check valve; 208. Return oil filter; 209. Accumulator; 210. Pressure sensor; 211. High-pressure pressure gauge; 212. Low-pressure pressure gauge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Such as Figures 1 - 3As shown in the figure, an embodiment of the present invention provides a combinable pump unit oil source system, including a pump unit 1, a hydraulic control unit 2, and a fuel tank 3. The pump unit 1 provides a power drive source for the entire system. The number of pump units 1 can be combined according to the total oil source flow requirement to form different flow specifications. The hydraulic control unit 2 is used to control the working state of the entire system, and the fuel tank 3 is used to hold the hydraulic oil required by the system.

[0026] Specifically, the number of pump units 1 can be combined according to the total oil source flow requirement to form different flow specifications. The total oil source flow formula is Q = q * n, where Q is the total oil source flow, with the unit of L / min, q is the rated flow of each pump unit 1, with the unit of L / min, and n is the number of pump units, with the unit of set.

[0027] The pump unit 1 includes a main oil pump 101, a motor 102, a cooling oil pump 103, a first one-way valve 104, a first overflow valve 105, a solenoid valve 106, and a second one-way valve 107. The main oil pump 101 is used to output the hydraulic oil in the fuel tank 3 as high-pressure oil. The motor 102 is used to drive the main oil pump 101 and the cooling oil pump 103 to provide a power source for both. The cooling oil pump 103 is used to cool and circulate the hydraulic oil in the fuel tank 3. The first one-way valve 104 is used to control the circulating flow direction of the hydraulic oil to prevent backflow. The first overflow valve 105 is used to control the output pressure value of the hydraulic oil. The solenoid valve 106 is used to unload the output pressure of the hydraulic oil. The second one-way valve 107 is used to control the outflow direction of the hydraulic oil to prevent the hydraulic oil from flowing between the pump units.

[0028] Specifically, the pump unit 1 includes a main oil pump 101, a motor 102, a cooling oil pump 103, a first one-way valve 104, a first overflow valve 105, a solenoid valve 106, and a second one-way valve 107. The main oil pump 101 outputs the hydraulic oil in the fuel tank 3 to form high-pressure oil to provide power for the fatigue testing machine. The power source of the main oil pump 101 comes from the motor 102, and the motor 102 rotates to drive the main oil pump 101 to operate. The first overflow valve 105 controls the output pressure value of the hydraulic oil (such as 21 MPa), the solenoid valve 106 unloads the hydraulic oil pressure (0 MPa), and the second one-way valve 107 controls the hydraulic oil to flow only in one direction, only out and not in, to prevent the pump units from flowing into each other. While the motor 102 drives the main oil pump 101, it also drives the cooling oil pump 103. The hydraulic oil output by the cooling oil pump 103 enters the oil return channel and finally passes through the cooler 205 to circulate and cool the hydraulic oil in the fuel tank 3. The first one-way valve 104 controls the hydraulic oil to flow only in one direction, only out and not in, to prevent the cooling oil pumps 103 from flowing into each other.

[0029] The hydraulic control unit 2 includes a small-flow solenoid valve 201, a large-flow solenoid valve 202, a high-pressure filter 203, a second overflow valve 204, a cooler 205, an electromagnetic water valve 206, a third check valve 207, an oil return filter 208, an accumulator 209, a pressure sensor 210, a high-pressure pressure gauge 211, and a low-pressure pressure gauge 212. The small-flow solenoid valve 201 and the large-flow solenoid valve 202 cooperate to relieve the pressure of the high oil outlet passage. The high-pressure filter 203 is used to filter out impurities in the hydraulic oil. The second overflow valve 204 is used to control the pressure value after the multi-pump group is aggregated. The cooler 205 is used to cool the hydraulic oil. The electromagnetic water valve 206 is used to control the inflow and outflow of cold water in the cooler 205. The third check valve 207 is used to slow down the oil return pressure. The oil return filter 208 is used to filter out impurities in the returned hydraulic oil. The accumulator 209 is used to absorb the pulsating fluctuations of the pressure to make the pressure more stable. The pressure sensor 210 is used to monitor the pressure value. The high-pressure pressure gauge 211 and the low-pressure pressure gauge 212 are used to measure the pressure values of the high-pressure oil outlet passage and the low-pressure oil return passage.

[0030] Specifically, the hydraulic control unit 2 includes a small-flow solenoid valve 201, a large-flow solenoid valve 202, a high-pressure filter 203, a second overflow valve 204, a cooler 205, an electromagnetic water valve 206, a third check valve 207, a return oil filter 208, an accumulator 209, a pressure sensor 210, a high-pressure pressure gauge 211, and a low-pressure pressure gauge 212. The hydraulic oil output by the main oil pump 101 and the cooling oil pump 103 in the pump unit 1 enters the high-pressure (oil outlet) channel and the low-pressure (return oil) channel of the hydraulic control unit 2 respectively. The second overflow valve 204 controls the pressure value after the multi-pump groups are aggregated (such as 21 MPa). The high-pressure oil passes through the high-pressure filter 203 to filter out the impurities in the hydraulic oil. Two sets of high-pressure filters 203 are provided. When the number of pump groups is small (such as 3 sets or less), only one set of high-pressure filter 203 is installed, and there is no need to set up a large-flow high-pressure filter 203, which can save the cost of the high-pressure filter 203 when the number of pump groups is small. The hydraulic oil enters the hydraulic equipment from the P1 and P2 interfaces through the high-pressure (oil outlet) channel, and then returns to the fuel tank 3 through T1 and T2. The hydraulic equipment is such as an electro-hydraulic servo fatigue testing machine. The accumulator 209 can absorb the pulsating fluctuations of the pressure to make the pressure more stable. The pressure sensor 210 monitors the pressure value and transmits the pressure value data back to the PLC or computer. The high-pressure pressure gauge 211 and the low-pressure pressure gauge 212 respectively measure the pressure values of the high-pressure (oil outlet) channel and the low-pressure (return oil) channel, and directly display the pressure value in the form of a pointer or digital display. The small-flow solenoid valve 201 and the large-flow solenoid valve 202 are used to relieve the pressure of the high-pressure (oil outlet) channel. When performing pressure relief, first open the small-flow solenoid valve 201 to relieve the pressure to a certain pressure value, and then open the large-flow solenoid valve 202 to relieve the remaining pressure. The cooperation between the small-flow solenoid valve 201 and the large-flow solenoid valve 202 can avoid the pipeline impact caused by too fast pressure relief. When all the hydraulic oil returns to the fuel tank 3 through the low-pressure (return oil) channel, it needs to pass through the cooler 205. The cooler 205 is a component for heat exchange between the hydraulic oil and the cooling water. The cooling water can take away the temperature of the hydraulic oil and play a role in cooling the hydraulic oil. The entry of cold water into the cooler 205 is controlled by the electromagnetic water valve 206, and the opening / closing of the electromagnetic water valve 206 is executed according to the temperature of the hydraulic oil to form the control of the hydraulic oil temperature.Two sets of coolers 205 are arranged in parallel. When the number of pump sets is small (such as 3 sets or less), only one set of cooler 205 is installed, and there is no need to set a large-area cooler 205 (the specification of the cooler 205 is the cooling area, unit: m^2). When the number of pump sets is small, the cost of the cooler 205 can be saved. The hydraulic oil enters the return oil filter 208 after passing through the cooler 205. The return oil filter 208 can filter out the impurities in the hydraulic oil. When the hydraulic oil passes through the cooler 205 and the return oil filter 208 and is blocked, the return oil pressure will increase, which may damage the cooler 205. To avoid the pressure increase, a return oil bypass channel is added. A one-way valve is set in the return oil bypass channel. The opening of the one-way valve requires a certain pressure value (such as 0.5 MPa). When this pressure value is reached, the hydraulic oil will pass through this bypass channel, and the return oil pressure will not continue to increase. The pressure upper limit is only the opening pressure of the one-way valve.

[0031] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combinable pump unit oil source system, comprising a pump unit (1), a hydraulic control unit (2) and a fuel tank (3), characterized in that: The pump unit (1) provides the power driving source for the whole system. The number of the pump units (1) can be combined according to the total flow demand of the oil source to form different flow specifications. The hydraulic control unit (2) is used to control the working state of the whole system. The oil tank (3) is used to store the hydraulic oil required by the system.

2. The combinable pump unit oil source system according to claim 1, wherein: The pump unit (1) includes a main oil pump (101), a motor (102), a cooling oil pump (103), a first one-way valve (104), a first overflow valve (105), a solenoid valve (106) and a second one-way valve (107).

3. The combined pump unit oil source system according to claim 2, wherein: The main oil pump (101) is used to output the hydraulic oil in the oil tank (3) as high-pressure oil. The motor (102) is used to drive the main oil pump (101) and the cooling oil pump (103) to provide the power source for both.

4. The combinable pump unit oil source system according to claim 2, characterized in that: The cooling oil pump (103) is used to cool and circulate the hydraulic oil in the oil tank (3). The first one-way valve (104) is used to control the circulating direction of the hydraulic oil to prevent backflow.

5. The oil source system of a combinable pump set according to claim 2, characterized in that: The first overflow valve (105) is used to control the output pressure value of the hydraulic oil. The solenoid valve (106) is used to unload the output pressure of the hydraulic oil.

6. The combined pump unit oil source system according to claim 2, characterized in that: The second one-way valve (107) is used to control the outflow direction of the hydraulic oil to prevent the hydraulic oil from flowing between the pump units.

7. The oil source system of a combinable pump unit according to claim 1, characterized in that: The hydraulic control unit (2) includes a small-flow solenoid valve (201), a large-flow solenoid valve (202), a high-pressure filter (203), a second overflow valve (204), a cooler (205), an electromagnetic water valve (206), a third one-way valve (207), an oil return filter (208), an accumulator (209), a pressure sensor (210), a high-pressure pressure gauge (211) and a low-pressure pressure gauge (212).

8. A combinable pump unit oil source system according to claim 7, characterized in that: The small-flow solenoid valve (201) and the large-flow solenoid valve (202) cooperate to unload the pressure of the high-pressure oil passage. The high-pressure filter (203) is used to filter out the impurities in the hydraulic oil. The second overflow valve (204) is used to control the pressure value after the multi-pump units are aggregated.

9. The oil source system of a combinable pump unit according to claim 7, characterized in that: The cooler (205) is used to cool the hydraulic oil. The electromagnetic water valve (206) is used to control the inflow and outflow of the cold water in the cooler (205). The third one-way valve (207) is used to slow down the oil return pressure. The oil return filter (208) is used to filter out the impurities in the returned hydraulic oil.

10. A combinable pump unit oil source system according to claim 7, characterized in that: The accumulator (209) is used to absorb the pulse fluctuation of the pressure to make the pressure more stable. The pressure sensor (210) is used to monitor the pressure value. The high-pressure pressure gauge (211) and the low-pressure pressure gauge (212) are used to measure the pressure values of the high-pressure oil outlet passage and the low-pressure oil return passage.

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