Multifunctional overflow valve group

Abstract

The utility model discloses a multifunctional overflow valve group which comprises a valve block, a P port, a T port and an L port are respectively arranged on the valve block, a logic valve, a two-position two-way electromagnetic valve and an overflow valve are respectively arranged on the valve block, the logic valve is connected between the P port and the T port, an input end of the electromagnetic valve is connected to an input end of the logic valve through a damping hole, and an output end of the overflow valve is connected to an output end of the logic valve. A control port of the logic valve takes pressure from the output end of the damping hole, and the output end of the electromagnetic valve is connected to the L port through the overflow valve. On the basis of a traditional overflow pressure relief unit, overflow pressure relief closing and opening functions are added, the working condition requirement is expanded, and the damping hole is formed in a non-working oil way, so that the effects of flow limiting and energy saving are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valve groups, in particular to a multifunctional overflow valve group. Background Art

[0002] Relief valves are commonly found in hydraulic systems, where they play a role in safety protection. When the system pressure exceeds the specified value, the relief valve core opens to discharge part of the oil in the system, so that the system pressure does not exceed the allowable value, thereby ensuring that the system does not cause accidents due to excessive pressure. At present, whether the relief valve is opened or not is only controlled by the system pressure, and the working conditions it can adapt to are limited. Utility Model Content

[0003] The purpose of the utility model is to provide a multifunctional overflow valve group to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multifunctional overflow valve group, including a valve block, on which a P port, a T port and an L port are respectively provided, and a logic valve, a two-position two-way solenoid valve and a overflow valve are respectively installed on the valve block, the logic valve is connected between the P port and the T port, the input end of the solenoid valve is connected to the input end of the logic valve through a damping hole, the control port of the logic valve takes pressure from the output end of the damping hole, and the output end of the solenoid valve is connected to the L port through the overflow valve.

[0005] Preferably, the relief valve is a pilot-operated relief valve.

[0006] Compared with the prior art, the beneficial effects of the utility model are: adding the closing and opening functions of the overflow pressure relief to the traditional overflow pressure relief unit, thereby expanding the working condition requirements; and setting a damping hole in the non-working oil circuit to play the role of current limiting and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the hydraulic principle of the utility model;

[0008] Figure 2 It is a three-dimensional structural schematic diagram of the utility model.

[0009] In the figure: 1. valve block; 2. logic valve; 3. solenoid valve; 4. overflow valve; 5. damping hole. DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0011] See also Figure 1-2 The utility model provides a technical solution: a multifunctional overflow valve group, including a valve block 1, the valve block 1 is respectively provided with a P port, a T port and an L port, the valve block 1 is respectively installed with a logic valve 2, a two-position two-way solenoid valve 3 and a overflow valve 4, the overflow valve 4 adopts a pilot overflow valve, the solenoid valve 3 is a normally closed type, and is conducted when power is supplied.

[0012] The logic valve 2 is connected between the P port and the T port. The input end of the solenoid valve 3 is connected to the input end of the logic valve 2 through the damping hole 5. The control port of the logic valve 2 takes pressure from the output end of the damping hole 5. The output end of the solenoid valve 3 is connected to the L port through the relief valve 4. When the solenoid valve 3 is energized, the pressure of the P port is the spring force of the logic valve 2 plus the set pressure of the relief valve 4. The set pressure of the relief valve 4 can be adjusted according to different working conditions. When the overflow function is not needed, the solenoid valve 3 is de-energized, and has multiple functions, so it can adapt to more working conditions. The damping hole 5 is set in the non-working oil circuit to play the role of current limiting and energy saving.

[0013] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional relief valve assembly, comprising a valve block (1), wherein the valve block (1) is provided with a P port, a T port and an L port, and wherein: The valve block (1) is respectively provided with a logic valve (2), a two-position two-way solenoid valve (3) and a relief valve (4); the logic valve (2) is connected between the P port and the T port; the input end of the solenoid valve (3) is connected to the input end of the logic valve (2) through a damping hole (5); the control port of the logic valve (2) takes pressure from the output end of the damping hole (5); and the output end of the solenoid valve (3) is connected to the L port through the relief valve (4).

2. A multifunctional relief valve assembly according to claim 1, characterized in that: The overflow valve (4) is a pilot-operated overflow valve.

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