Multi-way valve with pressure stabilizing valve

Abstract

The utility model discloses a multi-way valve with a pressure stabilizing valve. Belongs to the technical field of multi-way valves for cranes and excavators. The problem that a host executing mechanism in a load-sensitive system with double-pump confluence shakes is solved. The hydraulic system comprises a first oil inlet, a second oil inlet, a first reversing valve, a second reversing valve, a first feedback oil way, a third reversing valve and a second feedback oil way. The flow collecting valve is provided with a first position and a second position, wherein the first position is opened to enable the first oil inlet and the second oil inlet to be communicated, and the second position is closed. And the at least one pressure stabilizing valve is connected with the first feedback oil way and / or the second feedback oil way and is used for stabilizing the pressure of the system. The hydraulic system has the advantages that the pressure maintaining valve is arranged, energy can be stored through the first feedback oil way and / or the second feedback oil way, and when the composite action is removed into single connection work, the pressure maintaining valve can release energy, impact is reduced, and shaking is avoided. The utility model also has the advantages of simple structure, convenience in assembly, reliable action, long service life, small volume, low cost and the like.

Description

Technical Field

[0001] This utility model relates to the technical field of multi-way valves for cranes and excavators, specifically to a multi-way valve with a pressure regulating valve. Background Technology

[0002] In load-sensitive systems with dual pumps operating simultaneously, a single low-pressure action is combined with a high-pressure action. When the combined action is removed, the LS pressure on the high-pressure side switches from high to low. During this switching process, the pump feedback mechanism may not be able to respond in time, causing vibration in the main actuator. One existing solution is to add an accumulator to the LS port. When the high-pressure action is removed, the accumulator can release pressure, slowing down the transition from high to low pressure. However, existing accumulators generally have large cavities, and there may not be suitable volumes available on the market to "slow down the transition from high to low pressure" for different main actuator operating conditions. Furthermore, the large size of the accumulators leads to insufficient installation space in the main actuator and high cost. Utility Model Content

[0003] To address the issue of jitter in the host actuator of existing load-sensitive systems with dual-pump confluence in the background art, this utility model provides a multi-way valve with a pressure-stabilizing valve.

[0004] The technical solution of this utility model is: a multi-way valve with a pressure regulating valve, including a first oil inlet connected to a first hydraulic pump and a second oil inlet connected to a second hydraulic pump; further comprising:

[0005] The first working link includes the first directional valve;

[0006] The second working link includes the second directional valve;

[0007] The first feedback oil circuit is used for system pressure feedback; the pressure oil at the first inlet is connected to the first feedback oil circuit through the first reversing valve and the second reversing valve respectively.

[0008] The third working link includes the third directional valve;

[0009] The second feedback oil circuit is used for system pressure feedback; the pressure oil at the second oil inlet is connected to the second feedback oil circuit through the third directional valve.

[0010] The intermediate link includes a confluence valve, which has a first position open to connect the first oil inlet and the second oil inlet, and a second position closed; the pressure oils of the first feedback oil circuit and the second feedback oil circuit are connected when the confluence valve is in the first position and separated when the confluence valve is in the second position.

[0011] A pressure regulating valve, at least one of which is connected to a first feedback oil circuit and / or a second feedback oil circuit, is used for system pressure regulation.

[0012] The beneficial effects of this invention are that it incorporates a pressure regulating valve, which stores energy through the first and / or second feedback oil circuits. When the combined action is removed and operation becomes a single-phase operation, the pressure regulating valve releases energy, reducing impact and preventing vibration. This invention also boasts advantages such as simple structure, convenient assembly, reliable operation, long service life, small size, and low cost. Attached Figure Description

[0013] Appendix Figure 1 This is a hydraulic schematic diagram of an embodiment of the present invention.

[0014] Appendix Figure 2 This is a schematic diagram of the interconnection structure in an embodiment of this utility model.

[0015] Appendix Figure 3 This is a schematic diagram of the pressure regulating valve in an embodiment of the present invention.

[0016] Appendix Figure 4 This is a schematic diagram of the structure of the pressure regulating valve after energy storage in an embodiment of this utility model.

[0017] In the diagram, 1 is the first working link; 11 is the first directional valve; 2 is the second working link; 21 is the second directional valve; 3 is the third working link; 31 is the third directional valve; 4 is the intermediate link; 41 is the confluence valve; 42 is the shuttle valve; 43 is the hydraulic directional valve; 44 is the solenoid directional valve; 5 is the pressure regulating valve; 51 is the connector; 511 is the first receiving cavity; 512 is the second receiving cavity; 52 is the threaded sleeve; 521 is the connecting hole; 522 is the threaded hole; 53 is the first valve core; 54 is the energy storage elastic element; 55 is the second valve core; 551 is the first damping hole; 552 is the first elastic element; 56 is the sealing element; 57 is the vent hole; 6 is the fourth working link; 61 is the fourth directional valve; P1 is the first oil inlet; P2 is the second oil inlet; LS1 is the first feedback oil circuit; LS2 is the second feedback oil circuit. Detailed Implementation

[0018] The embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0019] Depend on Figure 1 Combination Figure 2-4 As shown, a multi-way valve with a pressure regulating valve includes a first inlet port P1 connected to a first hydraulic pump and a second inlet port P2 connected to a second hydraulic pump; it also includes:

[0020] The first working link 1 includes the first directional valve 11;

[0021] The second working link 2 includes the second directional valve 21;

[0022] The first feedback oil circuit LS1 is used for system pressure feedback; the pressure oil at the first oil inlet P1 is connected to the first feedback oil circuit LS1 through the first reversing valve 11 and the second reversing valve 21 respectively.

[0023] The third working link 3 includes the third directional valve 31;

[0024] The second feedback oil circuit LS2 is used for system pressure feedback; the pressure oil of the second oil inlet P2 is connected to the second feedback oil circuit LS2 through the third directional valve 31.

[0025] Intermediate link 4 includes a confluence valve 41, which has a first position open to connect the first oil inlet P1 and the second oil inlet P2 and a second position closed; the pressure oil of the first feedback oil circuit LS1 and the second feedback oil circuit LS2 are connected when the confluence valve 41 is in the first position and separated when the confluence valve 41 is in the second position.

[0026] At least one pressure regulating valve 5 is connected to the first feedback oil circuit LS1 and / or the second feedback oil circuit LS2 for system pressure regulation. The beneficial effect of this invention is that the pressure regulating valve stores energy through the first and / or second feedback oil circuits. When the combined action is removed and only single-action operation is performed, the pressure regulating valve can release energy, reducing impact and preventing vibration. This invention also has the advantages of simple structure, convenient assembly, reliable operation, long service life, small size, and low cost. Specifically, there are two pressure regulating valves 5, which are respectively connected to the first feedback oil circuit LS1 and the second feedback oil circuit LS2. Further explanation with reference to the attached diagram: Actually, there are two pressure regulating valves. Connect the pressure regulating valves to the LS ports of the multi-way valve (one to each LS port, i.e., the first feedback oil circuit and the second feedback oil circuit). When either of the multi-way valves operates in conjunction, the LS pressure oil will pass through the first damping orifice on the second valve core, pushing the first valve core to overcome the spring force (the spring force of the energy storage elastic element) and reverse direction. After the first valve core reverses to its correct position, the first valve core, the second valve core, the connector, and the screw sleeve will form a sealed cavity (the first receiving cavity). Taking the A4 port combined with the A1 port as an example; when the main unit performs the A4 action first and then the A1 action, the feedback pressure picked up by the LS2 side pump is approximately 15MPa, and the pressure picked up by the LS1 side pump is approximately 21MPa. When the A1 action is removed, the multi-way valve returns to its normal position (the normally open first position). The pressure at the LS1 port will quickly drop to approximately 15MPa. This rapid pressure fluctuation can cause the pump feedback mechanism to be unable to respond in time, resulting in vibration of the main unit's actuator. If the pressure regulating valve shown in this patent is installed at this time, when the A4 port is removed, the hydraulic oil stored in the first accommodating cavity can be released by opening the second valve core (the spring force of the first elastic element is very small). At this time, the hydraulic oil in the first accommodating cavity is high pressure oil and returns to the LS1 side, which will slow down the pressure change and thus improve or eliminate the effect of pressure change on the pump variable mechanism.

[0027] The pressure regulating valve 5 includes:

[0028] Connector 51 is used to connect to a multi-way valve;

[0029] Screw sleeve 52 is connected to connector 51;

[0030] The first valve core 53 is disposed in the connector 51 and divides the space in the connector 51 into a first receiving cavity 511 and a second receiving cavity 512.

[0031] The energy storage elastic element 54 is disposed in the second accommodating cavity 512 and abuts against the first valve core 53;

[0032] The second valve core 55 is located within the threaded sleeve 52. Pressure oil from either the first feedback oil circuit LS1 or the second feedback oil circuit LS2 enters the first accommodating cavity 511 through the second valve core 55 and compresses the energy storage elastic element 54, causing it to store energy. This structure allows the energy storage elastic element to reliably store energy, facilitating its release to push the hydraulic oil open the second valve core. This helps to balance impacts, allowing the LS pressure to decrease more slowly from high to low pressure, thus reducing actuator vibration.

[0033] The second valve core 55 is provided with a first damping orifice 551. Pressure oil from the first feedback oil circuit LS1 or the second feedback oil circuit LS2 enters the first receiving cavity 511 through the first damping orifice 551 and compresses the energy storage elastic element 54, causing the energy storage elastic element 54 to store energy. Specifically, it also includes a first elastic element 552. The second valve core 55 has a first position when installed and a second position when open. The first elastic element 552 abuts against the second valve core 55 and has a tendency to drive the second valve core 55 towards its first position. This structure allows the pressure oil from the feedback oil circuit to store energy for the pressure regulating valve during compound operations. In fact, the pressure regulating valve structures provided in the first and second feedback oil circuits are the same or similar.

[0034] The energy storage elastic element 54 pushes the first valve core 53, causing the pressure oil in the first accommodating cavity 511 to open the second valve core 55, placing it in the second position; there are at least two energy storage elastic elements 54. In this invention, there can be only one energy storage elastic element. A single spring requires a high force, and its high stiffness makes assembly difficult. The preferred embodiment of this invention is to use two energy storage elastic elements (springs), distributing the required force across the two springs. This results in lower spring stiffness and easier assembly.

[0035] This utility model also includes a connecting hole 521, which is provided on the threaded sleeve 52 for communicating with the first damping hole 551 and the first receiving cavity 511. The connecting hole 521 is provided with a threaded hole 522 for easy assembly of the damper. In this way, during the debugging process, the threaded hole can be matched with the best effect by changing the damper of different sizes.

[0036] A sealing element 56 is provided between the first valve core 53 and the connector 51, and a vent hole 57 is provided on the connector 51. The sealing element prevents hydraulic oil in the first accommodating cavity from entering the second accommodating cavity, and the vent hole prevents air in the system from entering the spring cavity (second accommodating cavity) and affecting the operation of the pressure regulating valve. At the same time, even if the sealing element is not effective, it can also allow the hydraulic oil flowing into the second accommodating cavity to flow out of the second accommodating cavity quickly.

[0037] This utility model also includes a fourth working link 6, which includes a fourth directional valve 61; the intermediate link 4 is located between the second working link 2 and the third working link 3, and the pressure oil at the second oil inlet P2 is connected to the second feedback oil circuit LS2 through the fourth directional valve. Generally speaking, the first and second working links are usually used to drive the mechanism to perform telescopic and luffing actions, while the third and fourth working links are usually used to drive the mechanism to perform hoisting actions (main hoist and auxiliary hoist).

[0038] The intermediate link 4 includes a shuttle valve 42, a hydraulic directional valve 43, and a solenoid directional valve 44. The shuttle valve 42 selects the pressure oil at the hydraulic directional valve 43 or the solenoid directional valve 44 to act on the confluence valve 41, causing the confluence valve 41 to tend to its second position. Specifically, the hydraulic oil at the solenoid directional valve usually comes from the pilot port, and the pressure oil at the hydraulic directional valve usually comes from the first inlet and the second inlet. Generally speaking, the hydraulic oil at the first inlet (after passing through the first directional valve and / or the second directional valve) opens the hydraulic directional valve, and the hydraulic oil at the second inlet (after passing through the third directional valve and / or the fourth directional valve) enters the control chamber of the confluence valve through the hydraulic directional valve and the shuttle valve, causing the confluence valve to close (the second position of the confluence valve). That is, the confluence valve is closed during compound operation, and the confluence valve is open during single operation, and the hydraulic oil at the first inlet and the hydraulic oil at the second inlet can act together.

[0039] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the inventive concept of this utility model is not limited to this utility model. Any modification that utilizes the inventive concept will be included within the scope of protection of this utility model patent.

Claims

1. A multi-way valve with a pressure regulating valve, comprising a first oil inlet (P1) connected to a first hydraulic pump and a second oil inlet (P2) connected to a second hydraulic pump; characterized in that: Also includes: The first working link (1) includes the first directional valve (11). The second working link (2) includes the second directional valve (21); The first feedback oil circuit (LS1) is used for system pressure feedback; the pressure oil in the first oil inlet (P1) is connected to the first feedback oil circuit (LS1) through the first reversing valve (11) and the second reversing valve (21); The third working link (3) includes the third directional valve (31); The second feedback oil circuit (LS2) is used for system pressure feedback; the pressure oil of the second oil inlet (P2) is connected to the second feedback oil circuit (LS2) through the third directional valve (31); The intermediate link (4) includes a confluence valve (41), which has a first position open to connect the first oil inlet (P1) and the second oil inlet (P2) and a second position closed; the pressure oil of the first feedback oil circuit (LS1) and the second feedback oil circuit (LS2) are connected when the confluence valve (41) is in the first position and separated when the confluence valve (41) is in the second position; At least one pressure regulating valve (5) is connected to the first feedback oil circuit (LS1) and / or the second feedback oil circuit (LS2) for system pressure regulation.

2. A multi-way valve with a pressure regulating valve according to claim 1, characterized in that... There are two pressure regulating valves (5), which are connected to the first feedback oil circuit (LS1) and the second feedback oil circuit (LS2) respectively.

3. A multi-way valve with a pressure regulating valve according to claim 1, characterized in that... The pressure regulating valve (5) includes: Connector (51) is connected to the multi-way valve; The threaded sleeve (52) is connected to the connector (51); The first valve core (53) is located inside the connector (51) and divides the space inside the connector (51) into a first receiving cavity (511) and a second receiving cavity (512). The energy storage elastic element (54) is disposed in the second accommodating cavity (512) and abuts against the first valve core (53); The second valve core (55) is located inside the screw sleeve (52). The pressure oil from the first feedback oil circuit (LS1) or the second feedback oil circuit (LS2) enters the first accommodating cavity (511) through the second valve core (55) and compresses the energy storage elastic element (54) so ​​that the energy storage elastic element (54) stores energy.

4. A multi-way valve with a pressure regulating valve according to claim 3, characterized in that... The second valve core (55) is provided with a first damping hole (551). The pressure oil of the first feedback oil circuit (LS1) or the second feedback oil circuit (LS2) enters the first accommodating cavity (511) through the first damping hole (551) and compresses the energy storage elastic element (54) so ​​that the energy storage elastic element (54) stores energy.

5. A multi-way valve with a pressure regulating valve according to claim 3, characterized in that... It also includes a first elastic element (552), the second valve core (55) having a first position when installed and a second position when opened; the first elastic element (552) abuts against the second valve core (55) and has a tendency to drive the second valve core (55) toward its first position.

6. A multi-way valve with a pressure regulating valve according to claim 5, characterized in that... The energy storage elastic element (54) pushes the first valve core (53) to open the second valve core (55) in the first accommodating cavity (511) by the pressure oil, so that it is in the second position; there are at least two energy storage elastic elements (54).

7. A multi-way valve with a pressure regulating valve according to claim 4, characterized in that... It also includes a connecting hole (521) on the threaded sleeve (52) for communicating with the first damping hole (551) and the first accommodating cavity (511). The connecting hole (521) is provided with a threaded hole (522) for easy assembly of damping.

8. A multi-way valve with a pressure regulating valve according to claim 3, characterized in that... A sealing element (56) is provided between the first valve core (53) and the connector (51), and an exhaust hole (57) is provided on the connector (51).

9. A multi-way valve with a pressure regulating valve according to claim 1, characterized in that... It also includes a fourth working link (6), which includes a fourth directional valve (61); the intermediate link (4) is located between the second working link (2) and the third working link (3), and the pressure oil of the second oil inlet (P2) is connected to the second feedback oil circuit (LS2) through the fourth directional valve ().

10. A multi-way valve with a pressure regulating valve according to claim 1, characterized in that... The intermediate link (4) includes a shuttle valve (42), a hydraulic directional valve (43), and a solenoid directional valve (44). The shuttle valve (42) selects the hydraulic directional valve (43) or the solenoid directional valve (44) to act on the confluence valve (41) so that the confluence valve (41) tends to its second position.

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