A pressure balancing system

Abstract

The present invention relates to the field of hydraulic control systems and discloses a pressure balancing system comprising: a first cartridge directional valve, wherein chamber A of the first cartridge directional valve is connected to an oil pump, chamber B of the first cartridge directional valve is connected to an accumulator, and chamber C of the first cartridge directional valve is connected to chamber B of the first cartridge directional valve; and a damper, the damper being arranged in parallel with the first cartridge directional valve, the oil pump, the damper, and the accumulator being sequentially connected, and the damper being configured to reduce the pressure difference between chamber A of the first cartridge directional valve and chamber B of the first cartridge directional valve, or to equalize the pressure in chamber A of the first cartridge directional valve with the pressure in chamber B of the first cartridge directional valve. The pressure balancing system provided by the present invention, by providing the damper, can effectively reduce the number of oil pump activations when the accumulator pressure frequently experiences small drops.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic control systems, and in particular to a pressure balancing system. Background Art

[0002] With the advancement of human science and technology and the growing social needs, the seismic safety of major projects such as high-rise buildings, cross-sea bridges, large-scale water conservancy projects, ultra-long tunnels, offshore wind power, and large-scale nuclear power has put forward an urgent demand for large-scale earthquake engineering simulation research facilities.

[0003] The earthquake simulation vibration table is an effective test platform for conducting earthquake simulation research. Due to their small scale, the existing earthquake simulation vibration tables at home and abroad can no longer meet the needs of ensuring project safety and normal service in the event of an earthquake. Identifying the weak links in the earthquake resistance of engineering structures and improving their ability to withstand earthquake damage is the most fundamental measure. The construction of a large-scale earthquake simulation vibration table is inseparable from a large number of accumulators as support. The accumulators provide power for the operation of the working valve group of the large-scale earthquake simulation vibration table. However, the oil pump is currently only connected to the accumulator through a one-way plug-in directional valve, and no other pressure regulating device is set. With this setting, when the accumulator pressure frequently drops slightly due to oil leakage or other reasons, it is very easy to cause the oil pump to start frequently, which in turn shortens the service life of the oil pump and makes it prone to damage.

[0004] Therefore, how to reduce the number of times the oil pump is started when the accumulator pressure frequently decreases slightly has become a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a pressure balancing system that can effectively reduce the number of times the oil pump is started when the accumulator pressure frequently drops slightly.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a pressure balancing system, comprising:

[0008] a first cartridge directional valve, wherein chamber A of the first cartridge directional valve is connected to the oil pump, chamber B of the first cartridge directional valve is connected to the accumulator, and chamber C of the first cartridge directional valve is connected to chamber B of the first cartridge directional valve;

[0009] a damper, the damper being arranged in parallel with the first cartridge directional valve, the oil pump, the damper, and the accumulator being sequentially connected, the damper being used to reduce a pressure difference between chamber A of the first cartridge directional valve and chamber B of the first cartridge directional valve, or to equalize the pressure of chamber A of the first cartridge directional valve with the pressure of chamber B of the first cartridge directional valve;

[0010] a second cartridge directional valve, wherein the A chamber of the second cartridge directional valve is connected to the oil tank, the B chamber of the second cartridge directional valve is connected to the working valve group, and the B chamber of the second cartridge directional valve is connected to the B chamber of the first cartridge directional valve;

[0011] A two-position three-way solenoid valve, wherein the two-position three-way solenoid valve is arranged between the B chamber of the second cartridge directional valve and the C chamber of the second cartridge directional valve, and when the two-position three-way solenoid valve loses power, the two-position three-way solenoid valve can disconnect the B chamber of the second cartridge directional valve from the C chamber of the second cartridge directional valve, and connect the C chamber of the second cartridge directional valve to the oil tank; when the two-position three-way solenoid valve is energized, the two-position three-way solenoid valve can connect the B chamber of the second cartridge directional valve to the C chamber of the second cartridge directional valve.

[0012] Optionally, the damper is a throttle.

[0013] Optionally, the two-position three-way solenoid valve is a two-position three-way solenoid ball valve.

[0014] Optionally, the B chamber of the first plug-in directional valve is used to communicate with a plurality of the accumulators, and all the accumulators are arranged in parallel, and the damper is communicated with each of the accumulators.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The pressure balancing system provided by the present invention can reduce the number of times the oil pump is started when the accumulator pressure frequently decreases slightly by providing a damper, so that the oil pump will not be started frequently, thereby extending the service life of the oil pump.

[0017] Specifically, if no damper is installed, when the accumulator pressure decreases, a pressure differential is generated between chamber A of the first directional valve and chamber B of the first directional valve. When this pressure differential is sufficient to open the first directional valve—that is, when this pressure differential overcomes the pressure applied to the valve core of the first directional valve by the spring in chamber C of the first directional valve—pressurized oil can flow from chamber A of the first directional valve to chamber B of the first directional valve, activating the oil pump to supply oil to the accumulator. It should be noted that because the spring force in chamber C of the first directional valve is very small and essentially negligible, the oil pump will activate as soon as the accumulator pressure decreases.

[0018] The present invention provides a pressure balancing system with a damper. When the accumulator pressure decreases, the damper can reduce the pressure differential between chamber A of the first directional valve and chamber B of the first directional valve, or equalize the pressure in chamber A of the first directional valve and the pressure in chamber B of the first directional valve. Thus, when the accumulator pressure frequently experiences small drops, the pressure balancing system provided by the present invention can effectively reduce the number of oil pump starts. It should be noted that the magnitude of these small drops is generally greater than the pressure applied to the valve core of the first directional valve by the spring in chamber C of the first directional valve. The specific amount of these small drops depends on actual operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic structural diagram of a pressure balancing system provided in an embodiment of the present invention.

[0021] Explanation of the accompanying reference numerals: 100, pressure balancing system; 1, first cartridge directional valve; 2, oil pump; 3, damper; 4, accumulator; 5, second cartridge directional valve; 6, two-position three-way solenoid valve; 7, oil tank; 8, working valve group. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The object of the present invention is to provide a pressure balancing system which can effectively reduce the number of starts of an oil pump when the accumulator pressure drops slightly.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] refer to Figure 1 As shown, the pressure balancing system 100 provided in this embodiment includes: a first cartridge directional valve 1 , a damper 3 , a second cartridge directional valve 5 and a two-position three-way solenoid valve 6 .

[0026] The A chamber of the first cartridge directional valve 1 is used to communicate with the oil pump 2, the B chamber of the first cartridge directional valve 1 is used to communicate with the accumulator 4, and the C chamber of the first cartridge directional valve 1 is connected to the B chamber of the first cartridge directional valve 1, so that the first cartridge directional valve 1 can only be opened in one direction, that is, the pressure oil can only flow from the A chamber of the first cartridge directional valve 1 to the B chamber of the first cartridge directional valve 1.

[0027] The damper 3 is arranged in parallel with the first cartridge directional valve 1, and the oil pump 2, the damper 3 and the accumulator 4 are connected in sequence. The damper 3 is used to reduce the pressure difference between the A chamber of the first cartridge directional valve 1 and the B chamber of the first cartridge directional valve 1 or to make the pressure of the A chamber of the first cartridge directional valve 1 equal to the pressure of the B chamber of the first cartridge directional valve 1.

[0028] The A chamber of the second cartridge directional valve 5 is used to communicate with the oil tank 7 , the B chamber of the second cartridge directional valve 5 is used to communicate with the working valve group 8 , and the B chamber of the second cartridge directional valve 5 is connected to the B chamber of the first cartridge directional valve 1 .

[0029] The two-position three-way solenoid valve 6 is arranged between the B chamber of the second cartridge directional valve 5 and the C chamber of the second cartridge directional valve 5, and when the two-position three-way solenoid valve 6 loses power, the two-position three-way solenoid valve 6 can disconnect the B chamber of the second cartridge directional valve 5 from the C chamber of the second cartridge directional valve 5, and connect the C chamber of the second cartridge directional valve 5 with the oil tank 7. When the two-position three-way solenoid valve 6 is energized, the two-position three-way solenoid valve 6 can connect the B chamber of the second cartridge directional valve 5 with the C chamber of the second cartridge directional valve 5.

[0030] By providing the damper 3 , the pressure balancing system 100 provided in this embodiment can reduce the number of starts of the oil pump 2 when the pressure of the accumulator 4 frequently decreases slightly, so that the oil pump 2 will not be started frequently, thereby extending the service life of the oil pump 2 .

[0031] Specifically, if damper 3 is not provided, when the pressure in accumulator 4 decreases, a pressure differential is generated between chamber A and chamber B of first directional valve 1. When this pressure differential is sufficient to open first directional valve 1—that is, when this pressure differential overcomes the pressure applied to the valve core of first directional valve 1 by the spring in chamber C of first directional valve 1—first directional valve 1 opens, pressurized oil can flow from chamber A of first directional valve 1 to chamber B of first directional valve 1, and oil pump 2 starts to supply oil to accumulator 4. It should be noted that because the spring force in chamber C of first directional valve 1 is very small and essentially negligible, oil pump 2 will activate as soon as the pressure in accumulator 4 decreases. Furthermore, during operation, as soon as first directional valve 1 opens and pressurized oil can flow from chamber A of first directional valve 1 to chamber B of first directional valve 1, oil pump 2 starts to supply oil to accumulator 4. Specifically, a monitoring element may be provided to monitor the opening and closing of the first cartridge directional valve 1 . When the monitoring element detects that the first cartridge directional valve 1 is open, the control element controls the oil pump to start automatically.

[0032] The present invention provides a pressure balancing system 100 with a damper 3. When the pressure of the accumulator 4 decreases, the damper 3 can reduce the pressure difference between the A chamber of the first cartridge directional valve 1 and the B chamber of the first cartridge directional valve 1 or make the pressure of the A chamber of the first cartridge directional valve 1 equal to the pressure of the B chamber of the first cartridge directional valve 1. In this way, when the pressure of the accumulator 4 frequently decreases slightly, the pressure balancing system 100 provided by the present invention can effectively reduce the number of starts of the oil pump 2. It should be noted that the amplitude of the slight decrease is generally greater than the elastic force of the C chamber spring of the first cartridge directional valve 1, and the specific amount of slight decrease depends on the actual working conditions. Specifically, in this embodiment, the pressure applied by the C chamber spring of the first cartridge directional valve 1 to the valve core of the first cartridge directional valve 1 is 0.2MPa, and the amplitude of the slight decrease is greater than 0 and less than 0.5MPa.

[0033] In this embodiment, the damper 3 is a throttle, such as a throttle plug. It should be noted that the damper 3 can be any structure that can generate damping and reduce pressure difference, and this is only an example.

[0034] In this embodiment, the two-position three-way solenoid valve 6 is a two-position three-way solenoid ball valve. Similarly, the two-position three-way solenoid valve 6 is not limited to a two-position three-way solenoid ball valve, which is only used as an example.

[0035] In this embodiment, chamber B of the first directional valve 1 is connected to multiple accumulators 4, and all accumulators 4 are arranged in parallel, and the damper 3 is connected to each accumulator 4. The specific number of accumulators 4 is determined according to actual needs.

[0036] The specific working process of the pressure balancing system 100 provided in this embodiment is as follows:

[0037] Accumulator 4 is pressurized: Oil pump 2 is started, and two-position three-way solenoid valve 6 is energized, closing second directional valve 5. System pressure oil flows from oil pump 2 to first directional valve 1, then through first directional valve 1 to accumulator 4, pressurizing it and storing energy. Once accumulator 4 reaches a specified pressure (determined by needs), pressurization is complete and oil pump 2 stops.

[0038] Energy release from accumulator 4: After accumulator 4 is pressurized and working valve group 8 is operating normally, 2-position 3-way solenoid valve 6 is energized, connecting chamber B of second directional valve 5 with chamber C of second directional valve 5. Second directional valve 5 closes, releasing energy from accumulator 4. Pressurized oil flows through chamber B of first directional valve 1 and chamber B of second directional valve to working valve group 8, rapidly replenishing oil supply to working valve group 8 and ensuring its normal operation. It should be noted that the hydraulic valve group required for a large-scale earthquake simulation shaker is called working valve group 8. The hydraulic valve group includes multiple hydraulic valves, and the specific arrangement of the multiple hydraulic valves depends on actual needs.

[0039] Pressure Relief: The working valve group 8 can relieve pressure through the second directional valve 5. At this point, the two-position, three-way solenoid valve 6 loses power. This de-energizes the two-position, three-way solenoid valve 6, disconnecting chambers B and C of the second directional valve 5 and connecting chamber C of the second directional valve 5 to the fuel tank 7. The second directional valve 5 then opens in the reverse direction, allowing the pressurized oil in the working valve group 8 to flow through chamber B to chamber A and back into the fuel tank 7. The second directional valve 5 uses a chamber B-to-chamber A release mechanism, and the pilot valve is a two-position, three-way solenoid ball valve. This prevents pressure drops caused by leakage within the plug or pilot valve during normal operation of the working valve group 8, ensuring effective pressure maintenance.

[0040] In the description of the present invention, it should be noted that the connection may be a direct connection between two structures, or an indirect connection between two structures via an intermediate structure.

[0041] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A pressure balancing system, characterized in that: include: a first cartridge directional valve, wherein chamber A of the first cartridge directional valve is connected to the oil pump, chamber B of the first cartridge directional valve is connected to the accumulator, and chamber C of the first cartridge directional valve is connected to chamber B of the first cartridge directional valve; a damper, the damper being arranged in parallel with the first cartridge directional valve, the oil pump, the damper, and the accumulator being sequentially connected, the damper being used to reduce a pressure difference between chamber A of the first cartridge directional valve and chamber B of the first cartridge directional valve, or to equalize the pressure of chamber A of the first cartridge directional valve with the pressure of chamber B of the first cartridge directional valve; a second cartridge directional valve, wherein the A chamber of the second cartridge directional valve is connected to the oil tank, the B chamber of the second cartridge directional valve is connected to the working valve group, and the B chamber of the second cartridge directional valve is connected to the B chamber of the first cartridge directional valve; A two-position three-way solenoid valve, wherein the two-position three-way solenoid valve is arranged between the B chamber of the second cartridge directional valve and the C chamber of the second cartridge directional valve, and when the two-position three-way solenoid valve loses power, the two-position three-way solenoid valve can disconnect the B chamber of the second cartridge directional valve from the C chamber of the second cartridge directional valve, and connect the C chamber of the second cartridge directional valve to the oil tank; when the two-position three-way solenoid valve is energized, the two-position three-way solenoid valve can connect the B chamber of the second cartridge directional valve to the C chamber of the second cartridge directional valve.

2. The pressure balancing system according to claim 1, characterized in that: The damper is a throttle.

3. The pressure balancing system according to claim 1, characterized in that: The two-position three-way solenoid valve is a two-position three-way solenoid ball valve.

4. The pressure balancing system according to claim 1, characterized in that: The B chamber of the first plug-in directional valve is used to communicate with a plurality of the accumulators, and all the accumulators are arranged in parallel, and the damper is communicated with each of the accumulators.

Images