CN219119887U

CN219119887U - High-flow two-way cartridge valve type direct-acting bidirectional overflow valve

Info

Publication number: CN219119887U
Application number: CN202320060131.3U
Authority: CN
Inventors: 邓江涛
Original assignee: 704th Research Institute of CSIC
Current assignee: 704th Research Institute of CSIC
Priority date: 2023-01-09
Filing date: 2023-01-09
Publication date: 2023-06-02
Anticipated expiration: 2033-01-09

Abstract

The utility model relates to a high-flow two-way cartridge valve type direct-acting bidirectional overflow valve, a valve core plug-in unit is arranged in an oil path block, the upper end of the valve core plug-in unit is connected with a pressure regulating cover plate fixed on the oil path block, an A oil path is connected with a shuttle valve through an a path and a B oil path through a B path, and a large-value one of the two oil paths after comparison of the shuttle valve reaches an upper valve core cavity in the valve core plug-in unit through an X path to realize high-flow quick response bidirectional overflow of the A oil path and the B oil path. The diameter structure of the valve core 3 section is adopted, so that the spring stiffness is reduced, and the size and the adjusting moment of the adjusting mechanism are small, and the pressure-flow curve is stable. And simultaneously, an additional function is selected to switch between the primary pressure and the secondary pressure. The bidirectional overflow valve has quick dynamic response, large flow rate which can reach several kiloliters per minute, the same value of the A-B and B-A bidirectional overflow pressure, small installation space, small adjusting moment, less faults, small volume of an oil circuit block and low cost under the condition of spring pressure setting.

Description

High-flow two-way cartridge valve type direct-acting bidirectional overflow valve

Technical Field

The utility model relates to a two-way overflow valve, in particular to a two-way cartridge valve type direct-acting two-way overflow valve.

Background

The flow of the traditional direct-acting overflow valve is limited, and the maximum flow is only 330L/min. But it is not possible for hydraulic systems with flow rates exceeding 330L/min, or even thousands of liters per minute.

For this high flow hydraulic system, there are two conventional approaches: 1. a plurality of existing direct-acting overflow valves are additionally arranged in parallel, but the purchase cost of the direct-acting overflow valves and the processing cost of oil circuit blocks are increased; the space installation size is increased, the difficulty is increased for the arrangement of system parts, and the engineering machinery is particularly prominent; the key disadvantage is that a plurality of relief valves of the same specification and set parameters are prone to resonance. 2. However, the two-way cartridge valve type relief valve is only of the pilot type and the no-direct-action type. Therefore, the quick response dynamic characteristic of the direct-acting overflow valve is lost, the possibility of blocking the valve is increased, and the hazard probability of the system is increased.

Meanwhile, the A, B oil ways of the actuating elements are all hydraulic systems needing pressure safety protection, and conventionally, overflow valves are additionally arranged on A, B oil ways respectively, so that the pressure safety protection of A, B oil ways can be realized.

The hydraulic system adopting the rod cavity oil return throttling speed regulation and stroke end buffer device of the hydraulic cylinder with large area ratio of the rodless cavity to the rod cavity cannot be avoided no matter the scheme of the traditional direct-acting type and pilot type overflow valve, and the possibility of cylinder explosion and pipe explosion exists.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present utility model is to provide a high-flow two-way cartridge valve type direct-acting bi-directional overflow valve, which utilizes the installation size and structure of the existing high-flow two-way cartridge valve to design the direct-acting overflow valve, so that the novel direct-acting overflow valve has fast dynamic response, large passing flow, up to several kiloliters per minute, small installation space, small adjusting moment, few faults, small oil path block volume and low cost. Meanwhile, for a hydraulic system adopting a rod cavity oil return throttling speed regulation and stroke end buffer device of a hydraulic cylinder with large area ratio of a rodless cavity to a rod cavity, the additional function option of the valve can be selected: with a fixed ratio of secondary pressures. Meanwhile, the pressure safety protection of the A, B oil way can be realized by only installing one valve between A, B oil ways of the actuating element.

In order to achieve the above purpose, the technical scheme of the utility model is as follows: the utility model provides a high-flow two-way cartridge valve formula direct-acting type two-way overflow valve, includes case plug-in components, pressure control apron, the case plug-in components are installed in the oil circuit piece, and the pressure control apron of fixing on the oil circuit piece is connected to case plug-in components upper end, and A oil circuit passes through a passageway and B oil circuit and passes through B passageway connection shuttle valve, through the big value oil circuit in two oil circuits after the shuttle valve comparison passes through X passageway and reaches the case upper chamber in the case plug-in components for realize the high-flow quick response two-way overflow of A oil circuit and B oil circuit.

Further, the pressure adjusting cover plate is fixed on the oil path block through an inner hexagon screw.

Further, the pressure regulating cover is composed of a pressure ring, a cover plate body, springs, spring seats, pins, nuts, regulating screws and limiting steel wires, the pressure ring is arranged in the lower portion of the cover plate body, the spring seats are respectively arranged in the cover plate body and the pressure ring, the two spring seats are connected through springs, the upper ends of the spring seats on the upper portion are connected with the regulating screws and the nuts through the pins, the limiting steel wires are arranged at the upper ends of the regulating screws, and the spring seats on the lower portion are connected with valve cores in the valve core plug-in.

Further, the valve core insert is composed of a valve seat and a valve core in the valve seat.

Further, the spool has three different diameter sections: diameter D1, diameter D2, diameter D3, wherein, diameter D3's circle area is 2 times of diameter D1's circle area, realizes under the spring pressure setting circumstances, makes A oil circuit to B oil circuit and B oil circuit to A oil circuit opening pressure value the same.

Further, the pre-pressure of the spring is balanced with the annular area acting force formed by the diameter D1 and the diameter D2 of the valve core, or is balanced with the area acting force formed by reducing the diameter D1 by the diameter D3 round area and reducing the diameter D2 round area.

Furthermore, an O-shaped ring is additionally arranged on the valve core, so that zero leakage between the oil circuit A and the oil circuit B is realized when the valve core is closed; or the valve core is provided with a pressure equalizing groove to realize sealing.

Further, the X channel of the large-flow two-way cartridge valve type direct-acting bidirectional overflow valve is connected with a secondary pressure additional function valve with a fixed ratio, and the secondary pressure additional function valve is used for protecting a hydraulic cylinder and preventing the hydraulic cylinder from having a rod cavity to boost accidents.

Further, the P port of the secondary pressure additional function valve with a fixed ratio is connected with a channel which is communicated with the channel a of the oil channel A and the channel B which is connected with the oil channel B and passes through the shuttle valve, and pressure oil at the port A reaches the cover plate body through the channel X and then enters the upper cavity of the valve core to control the oil to pass through or return oil tank, so that the switching between the primary pressure and the secondary pressure at the port A, B is realized.

The beneficial effects of the utility model are as follows:

the two-way cartridge valve type direct-acting bidirectional overflow valve has the advantages of quick dynamic response, large through flow, small installation space, small adjusting moment, few faults, small volume of an oil way block and low cost, and can reach thousands of liters per minute under the condition of regulating the pressure of a spring, wherein the pressure value of the two-way cartridge valve type direct-acting bidirectional overflow valve is the same as that of the two-way cartridge valve type direct-acting bidirectional overflow valve of A, B and B.

Drawings

FIG. 1 is a cross-sectional view of a high flow two-way cartridge valve type direct acting two-way relief valve in accordance with the first embodiment;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a hydraulic schematic diagram of an embodiment one;

FIG. 4 is a cross-sectional view of a high flow two-way cartridge valve type direct acting two-way relief valve in a second embodiment;

FIG. 5 is a top view of FIG. 4;

FIG. 6 is a hydraulic schematic diagram of an implementation two;

FIG. 7 is a block diagram of a valve cartridge;

FIG. 8 is a cross-sectional view of a pressure regulating cover plate structure;

fig. 9 is a partial structural sectional view of the oil passage block.

Detailed Description

The utility model is further described below with reference to the drawings and examples.

As shown in China 1,2,3 and 8, the utility model implements a high-flow two-way cartridge valve type direct-acting bidirectional overflow valve, and the installation size of the traditional two-way cartridge valve is in accordance with DIN24342, ISO7368 and GB2877, so that A-B high-flow quick response overflow is realized. The valve comprises an oil path block 1, a valve seat 2, a valve core 3, a pressure ring 4, a cover plate body 5, a spring 6, a spring seat 7, a pin 8, a nut 9, an adjusting screw 10, a limiting steel wire 11 and an inner hexagon screw 12.

Valve seat 2 and valve core 3 are combined to form a valve core insert fig. 8. The insert is inserted into the oil block 1. The pressure adjusting cover plate figure 9 is formed by combining a pressure ring 4, a cover plate body 5, a spring 6, a spring seat 7, a pin 8, a nut 9, an adjusting screw 10 and a limiting steel wire 11. The lower part of the cover plate body 5 is internally provided with a pressure ring 4, the cover plate body 5 and the pressure ring 4 are respectively provided with a spring seat 7, the two spring seats 7 are connected through a spring 6, the upper end of the spring seat 7 at the upper part is connected with an adjusting screw 10 and a nut 9 through a pin 8, and the upper end of the adjusting screw 10 is provided with a limiting steel wire 11. The pressure adjusting cover plate is fixed on the oil path block 1 through an inner hexagon screw 13. The lower spring seat 7 is connected to the valve core 3 in the valve core insert.

The installation size of the plug-in and the cover plate is the same as that of the existing two-way cartridge valve, and accords with DIN24342, ISO7368 and GB2877.

When the pressure of the A path or the B path does not reach the set pressure value of the spring, the valve core 3 is in a closed state under the action of the spring force, and the oil paths from A to B are not communicated; when the pressure of the A path or the B path reaches the set pressure value of the spring, the valve core 3 is lifted upwards against the spring force under the action of the hydraulic force, and is in an opening state, the A and the B are communicated, the high-flow bidirectional direct-acting overflow is realized,

as shown in fig. 4,5 and 6, the two-stage pressure of the high-flow two-way cartridge valve type direct-acting type two-way overflow valve of the second embodiment of the utility model can be selected to have a fixed ratio, and comprises the high-flow two-way cartridge valve type direct-acting type two-way overflow valve of the first embodiment and an additional function valve.

The additional function valve can be selected from the circuits shown in fig. 4,5 and 6 to realize the secondary pressure, and the ratio of the primary pressure to the secondary pressure is determined by the structural size of the valve. The c, d, e valves in the dashed box of fig. 4 may optionally be one type of valve.

The high-flow two-way cartridge valve type direct-acting bidirectional overflow valve can select a fixed-ratio secondary pressure, and hydraulic elements are simple in selection, convenient and rapid to combine, few in hydraulic elements, small in oil path block size and low in cost; the pressure safety protection of A, B oil paths can be realized by only installing one valve between A, B oil paths of the actuating element. The two-stage pressure additional function option with a fixed ratio is selected, so that the hydraulic cylinder can be safely protected, and the pressurizing accident of the rod cavity of the hydraulic cylinder is prevented.

In order to achieve the same opening pressure values of a→b and b→a when the spring pressure is set, the circular area of the diameter D3 of the valve body 3 is 2 times the circular area of the diameter D1, as shown in fig. 1. The large values are compared by the shuttle valve 12 through the shuttle valve 12 and then reach the upper cavity of the valve core 3 through the X channel from the A port to the a channel and from the B port to the B channel respectively, as shown in figure 1.

The pressure ring 4 is additionally arranged, so that the circular area of the diameter D1 of the valve core 3 is slightly larger than the circular area of the diameter D2, namely, the difference between the circular area of the diameter D3 and the circular area of the diameter D1 is slightly larger than the circular area of the diameter D2, and the valve is shown in figure 1.

The valve core 3 is additionally provided with an O-shaped ring, so that zero leakage between A and B is realized when the valve core 3 is closed, as shown in figure 1. The valve core 3 can be sealed by only processing the pressure equalizing groove without additionally installing an O-shaped ring, and is shown in fig. 7.

Because the pressure ring 4 and the shuttle valve 12 compare the action that the large value reaches the upper cavity of the valve core 3 through the X channel after the oil is controlled by the a channel and the b channel, the precompression of the spring 6 is balanced with the acting force of the annular area formed by the diameters D1 and D2 only, or is balanced with the acting force of the area of the circle of the diameter D3 minus the area of the circle of the diameter D1 and then minus the area of the circle of the diameter D2, and the precompression is shown in figure 1. Compared with the traditional direct-acting overflow valve, the overflow valve has the following maximum characteristics: the pre-pressure of the spring 6 is balanced with the annular area acting force formed by the diameters D1 and D2, or is balanced with the annular area acting force formed by the diameter D3 and the diameter D2, and is not balanced with the annular area acting force formed by the diameter D1, or is not balanced with the annular area acting force formed by the diameter D3 and the diameter D1, so that the spring stiffness is reduced, the flow-pressure curve is smooth, the space size for installing the spring is reduced, and the structure is compact.

The additional function valve realizes the secondary pressure with fixed ratio, as shown in figures 4,5 and 6, the channel a is led from the port A, the channel B is led from the port B, the large value is compared by the shuttle valve 12, the large value enters the port P of any valve shown by the broken line frames c, d and e, and the pressure oil at the port A of the valve reaches the cover plate body 5 through the channel X and then enters the upper cavity of the valve core 3. The valves of the broken line frames c, d and e control the on-off of the pressure oil in the lower cavity and the upper cavity of the valve core 3 and the oil return box, so that the switching of the primary pressure and the secondary pressure of the port A is realized, and the ratio of the primary pressure to the secondary pressure is determined by the structural size of the valve, as shown in figures 4 and 5.

The insert is inserted into the jack of fig. 9, the jack dimensions of fig. 9 being in accordance with DIN24342, ISO7368, GB2877.

The cover plate shown in fig. 8 is then installed in the socket of fig. 9, and 4 socket head cap screws are tightened.

The flow rate of a ship system of a certain model is 800L/min, the large-flow two-way cartridge valve type direct-acting two-way overflow valve is additionally arranged between the A, B ports of the executing element, DN40 is selected according to the traditional pressure type two-way cartridge valve, the structural size of the plug-in unit with the area ratio of the diameter D3 to the diameter D1 being 1.1, D3 is 42mm, and D1 is 40.2mm. The pressure ring 4 in fig. 1 was dimensioned and the D2 dimension was chosen to be 32mm. Calculating the annular areas of D1 and D2 to be 465mm ² . The application range of the pressure is 3.5-21 MPa. Calculating the spring force and the pre-pressure, and designing the structural size of the cover plate after designing the spring.

Claims

1. A high-flow two-way cartridge valve type direct-acting bidirectional overflow valve is characterized in that: the valve core plug-in unit comprises a valve core plug-in unit and a pressure adjusting cover plate, wherein the valve core plug-in unit is arranged in an oil path block, the upper end of the valve core plug-in unit is connected with the pressure adjusting cover plate fixed on the oil path block, an A oil path is connected with a shuttle valve through an a path and a B oil path through a B path, and a large-value oil path in the two oil paths after comparison of the shuttle valve reaches an upper valve core cavity in the valve core plug-in unit through an X path for realizing high-flow quick response bidirectional overflow of the A oil path and the B oil path.

2. The high flow two-way cartridge valve type direct acting two-way overflow valve of claim 1, wherein: the pressure regulating cover plate is fixed on the oil path block through an inner hexagon screw.

3. The high flow two-way cartridge valve type direct acting two-way overflow valve of claim 1, wherein: the pressure regulating cover is composed of a pressure ring, a cover plate body, springs, spring seats, pins, nuts, regulating screw rods and limiting steel wires, wherein the pressure ring is arranged in the lower portion of the cover plate body, the spring seats are respectively arranged in the cover plate body and the pressure ring, the two spring seats are connected through springs, the upper ends of the spring seats on the upper portion are connected with the regulating screw rods and the nuts through the pins, the limiting steel wires are arranged at the upper ends of the regulating screw rods, and the spring seats on the lower portion are connected with valve cores in the valve core plug-in.

4. The high flow two-way cartridge valve type direct acting two-way overflow valve of claim 1, wherein: the valve core insert is composed of a valve seat and a valve core in the valve seat.

5. The high flow two-way cartridge valve type direct acting two-way overflow valve of claim 4, wherein: the spool has three different diameter sections: diameter D1, diameter D2, diameter D3, wherein, diameter D3's circle area is 2 times of diameter D1's circle area, realizes under the spring pressure setting circumstances, makes A oil circuit to B oil circuit and B oil circuit to A oil circuit opening pressure value the same.

6. The high flow two-way cartridge valve type direct acting two-way overflow valve of claim 5, wherein: the pre-pressure of the spring in the pressure regulating cover is balanced with the annular area acting force formed by the diameter D1 and the diameter D2 of the valve core, or is balanced with the area acting force formed by reducing the area of the diameter D1 by the area of the diameter D3 circle and reducing the area of the diameter D2.

7. The high flow two-way cartridge valve type direct acting two-way overflow valve of claim 4, wherein: an O-shaped ring is additionally arranged on the valve core, so that zero leakage between the oil circuit A and the oil circuit B is realized when the valve core is closed; or the valve core is provided with a pressure equalizing groove to realize sealing.

8. The high flow two-way cartridge valve type direct acting two-way overflow valve of claim 1, wherein: the X channel of the large-flow two-way cartridge valve type direct-acting bidirectional overflow valve is connected with a two-stage pressure additional function valve with a fixed ratio, which is used for protecting the hydraulic cylinder and preventing the hydraulic cylinder from having a rod cavity to boost.

9. The high flow two-way cartridge valve type direct acting two-way overflow valve of claim 8, wherein: the P port of the secondary pressure additional function valve with a fixed ratio is connected with a channel which is communicated with an a channel of an oil channel A and a channel which is connected with an oil channel B and passes through a shuttle valve, and pressure oil at the port A reaches a cover plate body through a channel X and enters an upper cavity of a valve core to control the upper cavity of the valve core to control the oil to pass through or return oil tank, so that the switching between the primary pressure and the secondary pressure of the port A, B is realized.