Overflow prevention flush valve

Abstract

The utility model relates to the field of flush valves, and discloses an anti-overflowing flush valve which comprises a shell, a reversing valve element is arranged in the shell, a core cavity is formed in the shell, an overflow valve element is movably arranged in the core cavity, a throttling plate is arranged on the overflow valve element, a cavity A is formed in the shell, a cavity B is formed in the shell, and a valve rod is arranged in the cavity A; a cavity A is formed in the shell, a cavity B is formed in the shell, a port A is formed in the shell and communicated with the cavity A, a port B is formed in the shell and communicated with the cavity B, an overflow cavity is formed in the top end of the overflow valve element and communicated with the element cavity, and a port T is formed in the shell. According to the utility model, the structure of the flushing flow valve is changed, and the flushing channel is closed when the pressure rises, so that an oil seal is protected, and the service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of flush valve, concretely is a kind of prevent over-flow flush valve. BACKGROUND

[0002] The prevent over-flow flush valve is a kind of valve specially designed for use in hydraulic system, and its main function is to control the flow of fluid to prevent damage to system components due to excessive flow or pressure. Hydraulic systems are widely used in engineering machinery, automation equipment and industrial production, therefore, it is crucial to ensure the safety and stability of the system.

[0003] At present, most flush valves, when in use, the motor in closed system stops rotating instantaneously due to external factors, at this time the low pressure side of the motor pressure rises instantaneously, this low pressure side is communicated with the flush valve, and the flush flow also increases instantaneously due to the increase of pressure, therefore, there are the following shortcomings: the flow to the shell increases instantaneously, the shell pressure increases rapidly at this time, causing the rotation oil seal of the motor shaft to be damaged, resulting in reducing the service life of the equipment. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a prevent over-flow flush valve to solve the problem of reducing the service life of the equipment caused by the rotation oil seal of the motor shaft being damaged due to the flow to the shell increasing instantaneously at this time, the shell pressure increasing rapidly.

[0005] In order to achieve the above-mentioned utility model purposes, the utility model adopts the following technical solutions: a prevent over-flow flush valve, comprising a shell, a reversing valve core is arranged in the interior of the shell, a core cavity is arranged in the interior of the shell, an overflow valve core is movably arranged in the interior of the core cavity, a throttle plate is arranged on the overflow valve core, an A cavity is arranged on the shell, a B cavity is arranged on the shell, an A port is arranged on the shell, the A port is communicated with the A cavity, a B port is arranged on the shell, the B port is communicated with the B cavity, an overflow cavity is formed at the top end of the overflow valve core, the overflow cavity is communicated with the core cavity, and a T port is formed in the interior of the shell.

[0006] Preferably, two balance springs are arranged in the interior of the shell, and the two balance springs are respectively located at the left end and the right end of the reversing valve core.

[0007] Preferably, a support baffle is arranged between each of the two balance springs and the reversing valve core.

[0008] Preferably, an overflow spring is arranged in the interior of the shell, and the overflow spring is located at the bottom of the overflow valve core.

[0009] Preferably, a sealing ring is arranged between the core cavity and the overflow valve core.

[0010] Preferably, the thickness of the sealing ring is 0.2 cm.

[0011] Compared with the prior art, the anti-flow flushing valve adopting the technical scheme has the following beneficial effects:

[0012] I. In use, by changing the structure of the flushing flow valve, the flushing channel is closed when the pressure rises, which plays a role in protecting the oil seal and prolonging the service life of the equipment;

[0013] II. In use, the balance spring provides stable support and reset force for the reversing valve core, and when the system pressure changes and causes the reversing valve core to move, the balance spring can quickly respond and adjust its position, ensuring that the reversing valve core can accurately and stably stay at the required position, improving the stability and response speed of the reversing valve core. The support baffle helps to prevent the balance spring from directly contacting the reversing valve core during compression or stretching, thereby avoiding wear and noise caused by friction, and the support baffle also plays a guiding and limiting role, ensuring that the reversing valve core can move smoothly and accurately;

[0014] III. In use, the overflow spring provides the necessary pre-tightening force and adjustment capability for the overflow valve core, and when the system pressure rises, the overflow valve core is subjected to an upward thrust, at which time the overflow spring can resist this thrust and adjust the position of the overflow valve core, thereby controlling the overflow speed and pressure of the oil. The sealing ring helps to prevent oil leakage between the core cavity and the overflow valve core, ensuring the sealing performance of the flushing valve and the cleanliness of the oil, improving the sealing performance of the flushing valve and the cleanliness of the oil, and enhancing the durability and reliability of the flushing valve. The thickness of the sealing ring is set to 0.2 cm, which not only ensures sufficient sealing performance, but also avoids assembly difficulties and increased friction resistance caused by excessive thickness, so that the sealing ring can maintain high sealing efficiency while adapting to changes in oil pressure and temperature under various working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a cross-sectional view of an embodiment.

[0016] Figure 2 is a walking working condition diagram of an embodiment.

[0017] Figure 3 is a Figure 2 is an enlarged view of position A in the embodiment.

[0018] In the figure: 1, housing; 2, reversing valve core; 3, core cavity; 4, overflow valve core; 5, throttle plate; 6, A cavity; 7, B cavity; 8, A port; 9, B port; 10, overflow cavity; 11, T port; 12, balance spring; 13, support baffle; 14, overflow spring; 15, sealing ring. DETAILED DESCRIPTION

[0019] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] like Figures 1-3 As shown, an overflow prevention flushing valve includes a housing 1, a reversing valve core 2 inside the housing 1, a core cavity 3 inside the housing 1, an overflow valve core 4 movably disposed inside the core cavity 3, a throttling plate 5 on the overflow valve core 4, an A cavity 6 on the housing 1, a B cavity 7 on the housing 1, an A port 8 on the housing 1 connected to the A cavity 6, a B port 9 on the housing 1 connected to the B cavity 7, an overflow cavity 10 opened at the top of the overflow valve core 4, the overflow cavity 10 connected to the core cavity 3, and a T port 11 opened inside the housing 1.

[0021] During use, ports A8 and B9 on the flushing valve are connected to the two oil chambers of the hydraulic pump (motor) in the closed circuit, respectively, while port T11 returns directly to the oil tank. When port A8 is under high pressure, it pushes the reversing valve core 2 to the right, connecting chamber B7 with the overflow valve core 4. The oil then returns to the oil tank through a throttle plate 5 and the overflow valve core 4. Conversely, when port B9 is under high pressure, it pushes the reversing valve core 2 to the left, connecting chamber A6 with the overflow valve core 4. The oil then returns to the oil tank through a throttle plate 5 and the overflow valve core 4. By changing the structure of the flushing flow valve, the flushing channel is closed when the pressure increases, thus protecting the oil seal and extending the service life of the equipment.

[0022] like Figures 1-3 As shown, the housing 1 is equipped with two balance springs 12, which are located at the left and right ends of the reversing valve core 2, respectively.

[0023] In use, the balance spring 12 provides stable support and reset force for the reversing valve core 2. When the system pressure changes and the reversing valve core 2 moves, the balance spring 12 can respond quickly and adjust its position to ensure that the reversing valve core 2 can accurately and stably stay in the required position, thereby improving the stability and response speed of the reversing valve core 2.

[0024] like Figures 1-3 As shown, a support baffle 13 is provided between the two balance springs 12 and the reversing valve core 2, and an overflow spring 14 is provided inside the housing 1. The overflow spring 14 is located at the bottom of the overflow valve core 4.

[0025] In use, the support baffle 13 helps to prevent the direct contact between the balance spring 12 and the reversing spool 2 during compression or stretching, thereby avoiding the wear and noise caused by friction, and the support baffle 13 also plays a guiding and limiting role, ensuring that the reversing spool 2 can move smoothly and accurately. The overflow spring 14 helps to provide the necessary pre-tightening force and adjustment capability for the overflow spool 4. When the system pressure rises, the overflow spool 4 is subjected to an upward thrust, at which time the overflow spring 14 can resist this thrust and adjust the position of the overflow spool 4, thereby controlling the overflow speed and pressure of the oil.

[0026] As shown in Figures 1-3 The core cavity 3 and the overflow spool 4 are provided with a sealing ring 15, and the thickness of the sealing ring 15 is 0.2 cm.

[0027] In use, the sealing ring 15 helps to prevent oil leakage between the core cavity 3 and the overflow spool 4, ensuring the sealing performance of the flush valve and the cleanliness of the oil, improving the sealing performance of the flush valve and the cleanliness of the oil, and enhancing the durability and reliability of the flush valve. The thickness of the sealing ring 15 is set to 0.2 cm, which not only ensures sufficient sealing performance, but also avoids the assembly difficulty and increased friction resistance caused by excessive thickness, so that the sealing ring 15 can maintain high sealing efficiency while adapting to the changes in oil pressure and temperature under various working conditions.

[0028] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacements or changes to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An overflow prevention flushing valve, comprising a housing (1), characterized in that, The housing (1) is provided with a reversing valve core (2) inside, the housing (1) is provided with a core cavity (3) inside, the core cavity (3) is movably provided with an overflow valve core (4) inside, the overflow valve core (4) is provided with a throttling plate (5) on, the housing (1) is provided with an A cavity (6), the housing (1) is provided with a B cavity (7), the housing (1) is provided with an A port (8) on, the A port (8) is connected to the A cavity (6), the housing (1) is provided with a B port (9) on, the B port (9) is connected to the B cavity (7), the top of the overflow valve core (4) is provided with an overflow cavity (10) on, the overflow cavity (10) is connected to the core cavity (3), and the housing (1) is provided with a T port (11) inside.

2. The anti-overflow flushing valve according to claim 1, characterized in that: The housing (1) is provided with two balance springs (12), which are located at the left and right ends of the reversing valve core (2), respectively.

3. The anti-overflow flushing valve according to claim 2, characterized in that: Support baffles (13) are provided between the two balance springs (12) and the reversing valve core (2).

4. The anti-overflow flushing valve according to claim 3, characterized in that: An overflow spring (14) is provided inside the housing (1), and the overflow spring (14) is located at the bottom of the overflow valve core (4).

5. The anti-overflow flushing valve according to claim 1, characterized in that: A sealing ring (15) is provided between the core cavity (3) and the overflow valve core (4).

6. The anti-overflow flushing valve according to claim 5, characterized in that: The thickness of the sealing ring (15) is 0.2 cm.

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