Liquid filling pile-up valve of energy accumulator

Abstract

The invention discloses an energy accumulator prefill pile-up valve, belongs to the technical field of hydraulic pressure, and solves the problems that an existing energy accumulator prefill valve is large in installation occupied space, multiple in pipeline connection, lack of pressure measuring ports and poor in functionality. The pile-up valve comprises a main valve body, a compensation valve, a switching valve, an overflow valve, a first one-way valve, a double one-way valve, a second one-way valve and an electromagnetic valve are arranged on the main valve body, a liquid filling oil way used for communicating all the valves is formed in the main valve body, and the compensation valve, the first one-way valve, the double one-way valve and the second one-way valve are all arranged on the liquid filling oil way. The liquid filling pile-up valve for the energy accumulator is reasonable and compact in structural design, small in occupied space, simple in pipeline connection, higher in functionality and higher in safety.

Description

Technical Field

[0001] The invention relates to the technical field of accumulators, and in particular to an accumulator liquid-filling integrated valve. Background Art

[0002] For some engineering vehicles with full hydraulic brake systems, accumulators are required to improve the intermittent operation of the hydraulic pump high-pressure cycle or the brake system and other circuits share the oil source. This improves the braking response while optimizing the system. In addition, it can be used as an emergency oil source for several brakings when the oil source fails, so as to stop for maintenance and ensure driving safety. This brake system includes a service brake system and a parking brake system, one of the key components of which is the accumulator filling valve, and the control unit in the parking brake system is the parking control valve.

[0003] The main function of the accumulator charging valve is to charge the accumulator. When the pressure is lower than the set lower limit, the charging is started, and when the pressure reaches the set upper limit, the charging is stopped, so that the pressure of the accumulator is always kept within a certain range to meet the requirements of the vehicle braking system. The existing charging valve and parking control valve are installed independently, which takes up a lot of space and has many pipeline connections. In addition, the existing charging valve body generally lacks a pressure measuring port, and the functionality is poor. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an accumulator filling integrated valve in view of the above-mentioned deficiencies in the prior art, so as to overcome the defects of the existing filling valve and parking control valve that they occupy a large space when installed separately, have many pipeline connections and poor functionality.

[0005] The technical solution adopted by the present invention is: an accumulator filling integrated valve, comprising a main valve body, on which a compensation valve, a switching valve, a relief valve, a check valve 1, a double check valve, a check valve 2 and a solenoid valve are arranged, and a filling oil circuit for connecting various valves is opened in the main valve body, and the compensation valve, the check valve 1, the double check valve and the check valve 2 are all arranged on the filling oil circuit;

[0006] The main valve body is provided with an oil inlet P for connecting to an oil pump, a first oil outlet A1 for connecting to accumulator 1, a second oil outlet A2 for connecting to accumulator 2, a third oil outlet A for connecting to accumulator 3, a fourth oil outlet B for connecting to a parking brake, a bypass port O for connecting to other hydraulic systems, and an oil return port T for connecting to an oil return tank. The oil inlet P is connected to the third oil outlet A, the first oil outlet A1, and the second oil outlet A2 through a filling oil circuit;

[0007] A compensating valve, wherein a first spring and a first control port are arranged at one end of the compensating valve core, and a second control port connected to the oil inlet P is arranged at the other end thereof;

[0008] a switching valve, the switching valve being in communication with the first control port;

[0009] The overflow valve has an input port connected to the oil inlet P and an output port connected to the oil return port T;

[0010] One-way valve 1, whose liquid inlet end is connected to the oil outlet of the compensation valve, and whose liquid outlet end is connected to the input port of the double-one-way valve and the liquid inlet end of the second one-way valve;

[0011] One-way valve 2, whose liquid inlet end is connected with the double one-way valve input port and the one-way valve one liquid outlet end, and whose liquid outlet end is connected with the main valve body oil outlet A and the solenoid valve input port;

[0012] A double check valve, whose input port is connected to the pipeline between the one-way valve first liquid outlet end and the one-way valve second liquid inlet end, and whose two output ports are respectively connected to the first oil outlet A1 and the second oil outlet A2 of the main valve body;

[0013] The solenoid valve has an input port connected to the second liquid outlet end of the one-way valve and the third oil outlet A of the main valve body, and an output port connected to the fourth oil outlet B of the main valve body.

[0014] As a further improvement, the compensation valve includes a first port connected to the oil inlet P, a second port connected to the third oil outlet A, the first oil outlet A1, and the second oil outlet A2, and a third port connected to the bypass port O.

[0015] Furthermore, one end of the switching valve core is provided with a first hydraulic control port connected to the liquid filling oil circuit, and the other end thereof is provided with a second spring.

[0016] Furthermore, the switching valve further includes a fourth port communicating with the first control port, a fifth port communicating with the filling oil circuit, and a sixth port communicating with the oil return port T.

[0017] Furthermore, a one-way valve 1 is first connected in series on the pipeline connecting the second port with the third oil outlet A, the first oil outlet A1, and the second oil outlet A2, and then a one-way valve 2 and a double one-way valve are connected in parallel. The liquid inlet end of the one-way valve 1 is connected to the second port, and the liquid outlet end thereof is connected to the liquid inlet end of the one-way valve 2 and the input port of the double one-way valve. The two output ports of the double one-way valve are respectively connected to the first oil outlet A1 and the second oil outlet A2 of the main valve body, and the liquid outlet end of the one-way valve 2 is connected to the third oil outlet A and the input port of the solenoid valve.

[0018] Furthermore, the solenoid valve input port is connected to the second liquid outlet end of the one-way valve and the third oil outlet A of the main valve body, its output port is connected to the fourth oil outlet B of the main valve body, and its oil return port is connected to the oil return port T of the main valve body.

[0019] Furthermore, a throttling structure is provided on the pipeline connecting the first port to the third port, a throttling structure is provided on the pipeline connecting the second control port to the fifth port, and a throttling structure is provided on the pipeline connecting the liquid inlet end of the one-way valve 1 to the second port.

[0020] Furthermore, the main valve body is also provided with a first pressure measuring joint M1, a second pressure measuring joint M, a first pressure switch port SW1, a second pressure switch port SW2, and a third pressure switch port SW3. The first pressure measuring joint M1 is connected to the pipeline between the oil inlet P and the first control port, the second pressure measuring joint M is connected to the pipeline between the second liquid outlet end of the one-way valve and the oil outlet A, the first pressure switch port SW1 and the second pressure switch port SW2 are both connected to the pipeline between the first liquid outlet end of the one-way valve and the second liquid inlet end of the one-way valve, and the third pressure switch port SW3 is connected to the pipeline between the output port of the solenoid valve and the fourth oil outlet B of the main valve body.

[0021] Furthermore, an adjusting screw plug and a pressure-adjusting screw for adjusting the pre-compression amount of the second spring are threadedly connected on the outer wall of the main valve body, and the second spring is abutted between the switching valve core and the pressure-adjusting screw.

[0022] Furthermore, the compensation valve and the switching valve are both hydraulically controlled two-position three-way reversing valves.

[0023] Beneficial Effects

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. This filling integrated valve is a highly integrated filling valve, overflow valve and parking control valve. It has a reasonable and compact structure design, occupies a small space, and has simple pipe connections. It is easier to arrange and install for some compact engineering vehicles;

[0026] 2. The filling process of this liquid-filling integrated valve has little vibration and impact, and can maintain pressure for a long time. When the system pressure is abnormal, the relief valve can unload in time to protect the pressure safety of this system.

[0027] 3. A pressure measuring joint and a reserved pressure switch port are installed on the main valve body to facilitate pressure measurement during commissioning and after-sales troubleshooting. Alarm points are provided for low and high pressure of the accumulator and for the braking status of the parking brake. When the braking system is abnormal, timely feedback can be given to remind the driver to avoid accidents caused by driving the vehicle due to failure of the braking system. It has stronger functionality and higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 The third is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the main structure of the present invention;

[0031] Figure 4 It is a bottom view structural schematic diagram of the present invention;

[0032] Figure 5 for Figure 4 Cross-sectional view of the compensation valve cut along section AA;

[0033] Figure 6 for Figure 4 Cross-sectional view of the double check valve along section BB;

[0034] Figure 7 for Figure 3 Cross-sectional view of the switching valve cut along section CC;

[0035] Figure 8 It is a schematic diagram of the oil circuit principle structure of the present invention;

[0036] Fig. 9 It is a structural schematic diagram of the compensation valve in the present invention;

[0037] Fig.10 It is a structural schematic diagram of the switching valve in the present invention;

[0038] Fig.11 It is a structural schematic diagram of the double one-way valve in the present invention.

[0039] Among them: 1-main valve body, 2-compensation valve, 201-first control port, 202-first spring, 203-compensation valve core, 204-third port, 205-first port, 206-second port, 207-second control port, 3-switching valve, 301-first hydraulic control port, 302-second spring, 303-fifth port, 304-fourth port, 305-sixth port, 306-pressure regulating screw plug, 307-pressure regulating screw, 4-relief valve, 5-check valve 1, 6-double check valve , 601-seventh port, 602-ninth port, 603-eighth port, 7-check valve 2, 8-solenoid valve, 801-emergency screw, 9-throttling structure, 10-liquid filling oil circuit, P-oil inlet, A1-first oil outlet, A2-second oil outlet, A-third oil outlet, B-fourth oil outlet, O-bypass port, T-return oil port, M1-first pressure measuring joint, M-second pressure measuring joint, SW1-first pressure switch port, SW2-second pressure switch port, SW3-third pressure switch port. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0041] See also Figure 1-11 As shown, an accumulator charging integrated valve of the present invention comprises a main valve body 1, on which a compensation valve 2, a switching valve 3, a relief valve 4, a one-way valve 5, a double one-way valve 6, a second one-way valve 7 and a solenoid valve 8 are arranged, and a filling oil circuit 10 for connecting various valves is opened in the main valve body 1, and the compensation valve 2, the one-way valve 5, the double one-way valve 6, and the second one-way valve 7 are all arranged on the filling oil circuit 10;

[0042] The main valve body 1 is provided with an oil inlet P for connecting to an oil pump, a first oil outlet A1 for connecting to an accumulator 1, a second oil outlet A2 for connecting to an accumulator 2, a third oil outlet A for connecting to an accumulator 3, a fourth oil outlet B for connecting to a parking brake, a bypass port O for connecting to other hydraulic systems, and an oil return port T for connecting to an oil return tank. The oil inlet P is connected to the third oil outlet A, the first oil outlet A1, and the second oil outlet A2 through a filling oil circuit. The main valve body 1 is made of profiles, and the valve body size and oil port direction can meet the customized requirements of customers. The hydraulic flow channel is machined to meet the requirements of different oil channel diameters, and has better cleanliness, reduces costs, and shortens the production cycle;

[0043] A compensating valve 2, wherein a first spring and a first control port are arranged at one end of the compensating valve core, and a second control port connected to the oil inlet P is arranged at the other end thereof;

[0044] In this embodiment, refer to Figure 1 , Figure 5 and Figure 8 The compensation valve 2 is integrated in the main valve body 1 and is arranged on the filling oil circuit 10. The compensation valve 2 has a first working position and a second working position. The first working position is used to throttle the oil inlet P to the bypass port O, directly connect the first oil outlet A1 to the accumulator 1, the second oil outlet A2 to the accumulator 2 and the third oil outlet A to the accumulator 3 to charge the oil. The second working position is used to directly connect the oil inlet P to the bypass port O, and stop charging the accumulators 1, 2 and 3. A first spring 202 and a first control port 201 are provided at one end of the valve core of the compensation valve 2, and a second control port 207 connected to the oil inlet P is provided at the other end. The first spring 202 is used to bias the compensation valve 2 toward the first working position.

[0045] See also Figure 5 , Figure 8 and Fig. 9The compensation valve 2 is a hydraulically controlled two-position three-way reversing valve, and the compensation valve 2 includes a first port 205 connected to the oil inlet P and, a second port 206 connected to the filling oil circuit 10, and a third port 204 connected to the bypass port O; when the compensation valve 2 is in the first working position (right position), the first port 205 is connected to the second port 206 and the throttling conduction third port 204; when the reversing valve 2 is in the second working position (left position), the first port 205 is connected to the second port 206 and the third port 204 respectively. Among them, in the first working position, a throttling structure switching valve 3 is arranged on the pipeline connecting the first port 205 to the third port 204, and the switching valve 3 is connected to the first control port 201;

[0046] The overflow valve 4 has an input port connected to the oil inlet P, and an output port connected to the oil return port T. When the pressure at the oil inlet P of the main valve body is higher than the set pressure of the overflow valve 4, the overflow valve 4 is in an overflow state, so that the pressure at the oil inlet P is kept below the set pressure;

[0047] One-way valve 1, whose liquid inlet end is connected to the oil outlet of the compensation valve, and whose liquid outlet end is connected to the input port of the double-one-way valve and the liquid inlet end of the second one-way valve;

[0048] One-way valve 2, whose liquid inlet end is connected with the double one-way valve input port and the one-way valve one liquid outlet end, and whose liquid outlet end is connected with the main valve body oil outlet A and the solenoid valve input port;

[0049] A double check valve, whose input port is connected to the pipeline between the one-way valve first liquid outlet end and the one-way valve second liquid inlet end, and whose two output ports are respectively connected to the first oil outlet A1 and the second oil outlet A2 of the main valve body;

[0050] The solenoid valve has an input port connected to the second liquid outlet end of the one-way valve and the third oil outlet A of the main valve body, and an output port connected to the fourth oil outlet B of the main valve body.

[0051] Furthermore, a first hydraulic control port 301 communicating with the filling oil circuit is disposed at one end of the valve core of the switching valve, and a second spring 302 is disposed at the other end thereof.

[0052] In this embodiment, refer to Figure 1 , Figure 2 , Figure 7 and Figure 8 The switching valve 3 is integrated in the main valve body 1 and communicated with the first control port 201, and is used to control the compensation valve 2 to switch between the first working position and the second working position. The switching valve 3 has a first control position and a second control position. When the switching valve 3 is in the first control position (right position), the compensation valve 2 is controlled to be in the first working position for filling; when the switching valve 3 is in the second control position (left position), the compensation valve 2 is controlled to be in the second working position for stopping filling.

[0053] See also Figure 7, Figure 8 and Fig.10 One end of the valve core of the switching valve 3 is provided with a first hydraulic control port 301 connected to the filling oil circuit 10, and the other end thereof is provided with a second spring 302, and the second spring 302 is used to bias the switching valve 3 to the first control position; when the pressure of the first hydraulic control port 301 is less than the elastic force of the second spring 302, the switching valve 3 is in the first control position; when the pressure of the first hydraulic control port 301 is greater than the elastic force of the second spring 302, the switching valve 3 is in the second control position.

[0054] Furthermore, the switching valve 3 further includes a fourth port 304 communicating with the first control port 201 , a fifth port 303 communicating with the filling oil path 10 , and a sixth port 305 communicating with the oil return port T.

[0055] In this embodiment, refer to Figure 7 , Figure 8 and Fig.10 The switching valve 3 is a hydraulically controlled two-position three-way reversing valve, and the switching valve 3 includes a fourth port 304 connected to the first control port 201, a fifth port 303 connected to the filling oil circuit 10, and a sixth port 305 connected to the oil return port T; when the switching valve 3 is in the first control position, the fifth port 303 throttles and conducts the fourth port 304, and the sixth port 305 is cut off; when the switching valve 3 is in the second control position, the fourth port 304 throttles and conducts the sixth port 305, and the fifth port 303 is cut off.

[0056] Furthermore, a one-way valve 1 5 is first connected in series on the pipeline 10 connecting the second port 206 with the third oil outlet A, the first oil outlet A1, and the second oil outlet A2, and then a one-way valve 2 7 and a double one-way valve 6 are connected in parallel. The liquid inlet end of the one-way valve 1 5 is connected to the second port 206, and its liquid outlet end is connected to the liquid inlet end of the one-way valve 2 7 and the input port of the double one-way valve 6. The two output ports of the double one-way valve 6 are respectively connected to the first oil outlet A1 and the second oil outlet A2 of the main valve body 1, and the liquid outlet end of the one-way valve 2 7 is connected to the third oil outlet A and the input port of the solenoid valve 8.

[0057] In this embodiment, refer to Figure 6 , Figure 8 and Fig.11 The double check valve 6 is a three-position three-way valve, and the double check valve 6 includes an eighth port 603 connected to the filling oil circuit 10, a seventh port 601 connected to the first oil outlet A1, and a ninth port 602 connected to the second oil outlet A2; when the double check valve 6 is in the middle position, the eighth port 603 is connected to the seventh port 601 and the ninth port 602 at the same time; when the double check valve 6 is in the left position, the eighth port 603 is connected to the seventh port 601; when the double check valve 6 is in the right position, the eighth port 603 is connected to the ninth port 602.

[0058] See also Figure 8 The second port 206 is connected to the first oil outlet A1, the second oil outlet A2 and the third oil outlet A. The one-way valve 15 is first connected in series on the filling oil circuit 10, and then the one-way valve 27 and the double one-way valve 6 are connected in parallel. The liquid inlet end of the one-way valve 15 is connected to the second port 206, and the liquid outlet end thereof is connected to the liquid inlet end of the one-way valve 27 and the eighth port 603 of the double one-way valve 6. The one-way valve 15 can be set to maintain the pressure of the accumulator 1 and the accumulator 2 with a lower pressure, the double one-way valve 6 can be set to maintain the pressure of the accumulator 1 and the accumulator 2 with a higher pressure, and the one-way valve 27 can be set to maintain the pressure of the accumulator 3 to prevent the pressure oil from flowing back and unloading.

[0059] Furthermore, the input port of the solenoid valve 8 is connected to the liquid outlet end of the one-way valve 2 7 and the third oil outlet A of the main valve body 1, its output port is connected to the fourth oil outlet B of the main valve body 1, and its return oil port is connected to the return oil port T of the main valve body 1.

[0060] See also Figure 2 and Figure 8 The solenoid valve 8 is a two-position three-way reversing valve. When the solenoid valve 8 loses power, the fourth oil outlet B connected to the parking brake is connected to the oil return port T, and the parking brake is in a braking state; when the solenoid valve 8 is energized, the fourth oil outlet B connected to the parking brake is connected to the third oil outlet A, and the parking brake is in an unlocked state; the solenoid valve 8 includes an emergency screw 801. When the coil of the solenoid valve 8 is damaged and the parking brake needs to be unlocked, the emergency screw 801 can be screwed in with a tool to make the solenoid valve function the same as when it is energized.

[0061] Furthermore, a throttling structure is provided on the pipeline connecting the first port to the third port, a throttling structure is provided on the pipeline connecting the second control port to the fifth port, and a throttling structure is provided on the pipeline connecting the liquid inlet end of the one-way valve 1 to the second port. The throttling structure 9 can be a damping plug or a damping hole to play a throttling role.

[0062] Further, see Figure 1 , Figure 2 and Figure 8The main valve body 1 is provided with a first pressure measuring joint M1, a second pressure measuring joint M, a first pressure switch port SW1, a second pressure switch port SW2, and a third pressure switch port SW3. The first pressure measuring joint M1 is connected to the pipeline between the oil inlet P and the input port of the relief valve 4. A pressure gauge can be installed on the first pressure measuring joint M1 to observe the pressure change of the oil inlet P during debugging and troubleshooting. The second pressure measuring joint M is connected to the pipeline between the check valve 2 7 and the third oil outlet A. A pressure gauge can be installed on the second pressure measuring joint M to observe the pressure change of the accumulator 3 during debugging and troubleshooting. The first pressure switch port SW1 and the second pressure switch port SW2 are both connected to the pipeline between the liquid outlet end of the check valve 1 5 and the liquid inlet end of the check valve 2. Pressure switches can be installed on the first pressure switch port SW1 and the second pressure switch port SW2 to alarm when the accumulator pressure is too high or too low. The third pressure switch port SW3 is connected to the pipeline between the output port of the solenoid valve 8 and the fourth oil outlet B. A pressure switch can be installed on the third pressure switch port SW3 to alarm when the parking brake is not completely unlocked.

[0063] Further, see Figure 2 and Figure 7 The outer wall of the main valve body 1 is threadedly connected with a pressure regulating plug 306 and a pressure regulating screw 307 for adjusting the pre-compression amount of the second spring 302, and the second spring 302 is placed between the pressure regulating screw 307 and the valve core of the switching valve 3. In this way, the pressure regulating screw 307 is externally arranged, which is convenient for adjusting the pre-compression amount of the spring and the system pressure.

[0064] The accumulator charging integrated valve is used as follows:

[0065] In the initial filling state: under the action of the second spring 302, the switching valve 3 is in the first control position (right position); under the action of the first spring 202, the compensating valve 2 is in the first working position (right position); the pressure oil enters the compensating valve 2 from the oil inlet P, and reaches the oil outlet A1 for accumulator 1, the oil outlet A2 for accumulator 2, and the oil outlet A for accumulator 3 through the one-way valve 5 for filling; at this time, the pressure oil passing through the compensating valve 2 acts on the first control port 201 of the compensating valve 2 after passing through the switching valve 3, and the sum of the pressure at the first control port 201 and the elastic force of the first spring 202 is greater than the pressure at the second control port 207, so that the compensating valve 2 remains in the filling state of the first working position.

[0066] Filling end state: when the pressure of the first oil outlet A1, the second oil outlet A2 and the third oil outlet A is greater than the elastic force of the second spring 302, the switching valve 3 switches from the first control position to the second control position (left position), so that the first control port 201 is connected to the return oil port T. At this time, the pressure of the second control port 207 of the switching valve 2 is greater than the elastic force of the first spring 202, and the compensation valve 2 switches from the first working position to the second working position (left position), thereby stopping the filling; due to the presence of the one-way valve 1 5, the one-way valve 2 6 and the double one-way valve 7, the accumulator maintains pressure.

[0067] Unlocked state of the parking brake: After the third filling of the accumulator is completed, when the solenoid valve 8 is energized, the fourth oil outlet B connected to the parking brake is connected to the third oil outlet A, providing a pressure oil source to the parking brake, so that it is in an unlocked state.

[0068] Braking state of the parking brake: when the solenoid valve 8 loses power, the fourth oil outlet B connected to the parking brake is communicated with the oil return port T, so that the parking brake is depressurized and is in a braking state.

[0069] An accumulator charging integrated valve provided in the present embodiment highly integrates the charging valve, the overflow valve and the parking control valve, is small and compact, occupies a small space, has simple pipeline connection, and is more convenient for layout and installation for some compact engineering vehicles; the main valve body is made of profiles, and the valve body size and oil port direction can meet customer customization requirements; the hydraulic flow channel is machined, which has better cleanliness, reduces costs and shortens the production cycle; a pressure measuring joint and a pressure switch port are installed on the main valve body, which are convenient for debugging pressure measurement and after-sales troubleshooting, provide alarm points for low and high pressure of the accumulator, and provide alarm points for the braking status of the parking brake. When the braking system is abnormal, it can provide timely feedback to remind the driver to avoid accidents caused by driving the vehicle due to failure of the braking system. It has stronger functionality and higher safety.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. An accumulator charging integrated valve, characterized in that: It includes a main valve body, on which a compensation valve, a switching valve, a relief valve, a check valve 1, a double check valve, a check valve 2 and a solenoid valve are arranged, and a filling oil circuit for connecting various valves is opened in the main valve body, and the compensation valve, the check valve 1, the double check valve and the check valve 2 are all arranged on the filling oil circuit; The main valve body is provided with an oil inlet P for connecting to an oil pump, a first oil outlet A1 for connecting to accumulator 1, a second oil outlet A2 for connecting to accumulator 2, a third oil outlet A for connecting to accumulator 3, a fourth oil outlet B for connecting to a parking brake, a bypass port O for connecting to other hydraulic systems, and an oil return port T for connecting to an oil return tank. The oil inlet P is connected to the third oil outlet A, the first oil outlet A1, and the second oil outlet A2 through a filling oil circuit; A compensating valve, wherein a first spring and a first control port are arranged at one end of the compensating valve core, and a second control port connected to the oil inlet P is arranged at the other end thereof; a switching valve, the switching valve being in communication with the first control port; The overflow valve has an input port connected to the oil inlet P and an output port connected to the oil return port T; One-way valve 1, whose liquid inlet end is connected to the oil outlet of the compensation valve, and whose liquid outlet end is connected to the input port of the double-one-way valve and the liquid inlet end of the second one-way valve; One-way valve 2, whose liquid inlet end is connected with the double one-way valve input port and the one-way valve one liquid outlet end, and whose liquid outlet end is connected with the main valve body oil outlet A and the solenoid valve input port; A double check valve, whose input port is connected to the pipeline between the one-way valve first liquid outlet end and the one-way valve second liquid inlet end, and whose two output ports are respectively connected to the first oil outlet A1 and the second oil outlet A2 of the main valve body; The solenoid valve has an input port connected to the second liquid outlet end of the one-way valve and the third oil outlet A of the main valve body, and an output port connected to the fourth oil outlet B of the main valve body.

2. The accumulator charging integrated valve according to claim 1, characterized in that: The compensation valve includes a first port connected to the oil inlet P, a second port connected to the third oil outlet A, the first oil outlet A1, and the second oil outlet A2, and a third port connected to the bypass port O.

3. The accumulator charging integrated valve according to claim 1, characterized in that: One end of the switching valve core is provided with a first hydraulic control port connected to the liquid filling oil circuit, and the other end thereof is provided with a second spring.

4. The accumulator charging integrated valve according to claim 3, characterized in that: The switching valve further includes a fourth port communicating with the first control port, a fifth port communicating with the filling oil path, and a sixth port communicating with the oil return port T.

5. The accumulator charging integrated valve according to claim 1, characterized in that: On the pipeline connecting the second port with the third oil outlet A, the first oil outlet A1, and the second oil outlet A2, a one-way valve 1 is first connected in series, and then a one-way valve 2 and a double one-way valve are connected in parallel. The liquid inlet end of the one-way valve 1 is connected to the second port, and its liquid outlet end is connected to the liquid inlet end of the one-way valve 2 and the input port of the double one-way valve. The two output ports of the double one-way valve are respectively connected to the first oil outlet A1 and the second oil outlet A2 of the main valve body, and the liquid outlet end of the one-way valve 2 is connected to the third oil outlet A and the input port of the solenoid valve.

6. The accumulator charging integrated valve according to claim 1, characterized in that: The solenoid valve input port is connected to the second liquid outlet end of the one-way valve and the third oil outlet A of the main valve body, its output port is connected to the fourth oil outlet B of the main valve body, and its return oil port is connected to the return oil port T of the main valve body.

7. The accumulator charging integrated valve according to claim 4, characterized in that: A throttling structure is provided on the pipeline connecting the first port to the third port, a throttling structure is provided on the pipeline connecting the second control port to the fifth port, and a throttling structure is provided on the pipeline connecting the liquid inlet end of the one-way valve 1 to the second port.

8. The accumulator charging integrated valve according to claim 1, characterized in that: The main valve body is also provided with a first pressure measuring joint M1, a second pressure measuring joint M, a first pressure switch port SW1, a second pressure switch port SW2, and a third pressure switch port SW3. The first pressure measuring joint M1 is connected to the pipeline between the oil inlet P and the first control port, the second pressure measuring joint M is connected to the pipeline between the second liquid outlet end of the one-way valve and the oil outlet A, the first pressure switch port SW1 and the second pressure switch port SW2 are both connected to the pipeline between the first liquid outlet end of the one-way valve and the second liquid inlet end of the one-way valve, and the third pressure switch port SW3 is connected to the pipeline between the output port of the solenoid valve and the fourth oil outlet B of the main valve body.

9. The accumulator charging integrated valve according to claim 3, characterized in that: An adjusting screw plug and a pressure adjusting screw for adjusting the pre-compression amount of the second spring are threadedly connected on the outer wall of the main valve body, and the second spring is abutted between the switching valve core and the pressure adjusting screw.

10. The accumulator charging integrated valve according to claim 1, characterized in that: The compensation valve and the switching valve are both hydraulically controlled two-position three-way reversing valves.

Images