Constant pressure difference type multi-stage pressure regulating and remote unloading flow collecting valve group

Abstract

The utility model relates to a constant pressure difference type multi-stage pressure regulating and remote unloading flow collecting valve bank which comprises a valve body, a one-way valve assembly, a sliding valve element and a direct-acting overflow valve. The one-way valve assembly is installed at a third connector connected with the first oil inlet, the third connector is communicated with the second oil inlet through an internal flow channel, and confluence oil supply of the first oil inlet and the second oil inlet is achieved. The sliding valve element is installed in the sliding valve cavity, one pilot end of the sliding valve element is communicated with the second oil inlet, the other pilot end of the sliding valve element is communicated with the oil return opening through the direct-acting overflow valve, meanwhile, the sliding valve element is further provided with a throttling piece, and the throttling piece is connected with the sliding valve element. Unloading of different pressure sections can be achieved by adjusting the pressure of the direct-acting overflow valve and replacing throttling elements with different hole diameters.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic valve groups, and in particular to a confluence valve group that integrates constant differential pressure regulation, multi-stage pressure switching and remote control functions, and is suitable for high-pressure and high-flow hydraulic systems such as engineering machinery and metallurgical equipment. Background Technology

[0002] In hydraulic systems, especially in construction machinery, different subsystems often need to withstand different pressures to complete different tasks. For example, the hydraulic system of a loader includes a steering hydraulic system and a working hydraulic system. The steering hydraulic system has smaller pressure fluctuations and relatively lower pressure levels, while the working hydraulic system has larger pressure fluctuations and may require high flow rate at low pressure or low flow rate at high pressure depending on the operational needs (such as loading loose materials or rocks and wet soil).

[0003] To save energy and improve efficiency, loaders typically use a confluence valve to connect the steering hydraulic system and the working hydraulic system. When the working hydraulic system requires low pressure and high flow, the confluence valve introduces hydraulic oil from the steering system into the working hydraulic system to meet the needs of rapid movement of the working device. Conversely, when the working hydraulic system requires high pressure and low flow, the confluence valve isolates the working hydraulic system from the steering system and unloads the steering system through the tank circuit.

[0004] However, existing confluence unloading valves have some drawbacks, especially in high-pressure operating environments. Most existing confluence unloading valves only use the unloading valve itself for unloading, without being used in conjunction with other pressure regulating components. This results in a relatively fixed unloading pressure value, failing to achieve unloading at different pressure ranges. Furthermore, existing unloading valves are mostly manually controlled and adjusted, lacking proper integration with remote control modules. This contradicts the current concept of intelligent remote control in mechanical automation development, failing to achieve flexible and convenient operation. Utility Model Content

[0005] The purpose of this utility model is to provide a constant differential pressure multi-stage pressure regulating and remote unloading confluence valve assembly, which aims to solve the problem that existing confluence unloading valves cannot be used in conjunction with other pressure regulating components and cannot achieve unloading at different pressure levels.

[0006] Therefore, this utility model proposes a constant differential pressure multi-stage pressure regulating and remote unloading confluence valve assembly, including a valve body, a one-way valve assembly, a spool valve core, and a direct-acting relief valve; the valve body has a spool valve cavity and multiple oil ports communicating with the spool valve cavity, the multiple oil ports being an oil inlet one, an oil inlet two, and an oil return port.

[0007] The one-way valve assembly is installed at interface three connected to oil inlet one, and interface three is connected to oil inlet two through an internal flow channel, so as to realize the combined oil supply of oil inlet one and oil inlet two; the slide valve core is installed in the slide valve cavity, and one pilot end of the slide valve core is connected to oil inlet two, and the other pilot end of the slide valve core is connected to the return port through the direct-acting relief valve. At the same time, the slide valve core is also provided with a throttling element. By adjusting the pressure of the direct-acting relief valve and replacing the throttling element with a different orifice size, the unloading of different pressure ranges can be achieved.

[0008] As a preferred technical solution of this application, a two-position two-way solenoid valve is connected in parallel at both ends of the direct-acting relief valve, which can complete the rapid unloading of the pilot end.

[0009] As a preferred technical solution of this application, the two-position two-way solenoid valve is connected to interface one at one end of the valve body through a transition sleeve.

[0010] As a preferred technical solution of this application, the other end of the valve body is provided with an interface four for installing a screw plug, and the interface four is connected to the oil inlet two.

[0011] As a preferred embodiment of this application, the one-way valve assembly includes a one-way valve core and a one-way valve seat, wherein the one-way valve seat is installed within the interface three.

[0012] As a preferred technical solution of this application, the one-way valve core and the one-way valve seat are connected by a spring.

[0013] As a preferred technical solution of this application, the outer end of the one-way valve seat is provided with a pressure measuring plug.

[0014] This utility model provides a constant differential pressure multi-stage pressure regulating and remote unloading confluence valve assembly. It features multi-stage pressure regulation, allowing for unloading at different pressure stages by adjusting the relief valve pressure and replacing throttling elements with different orifice sizes according to hydraulic system requirements. The valve assembly integrates a two-position two-way solenoid valve, enabling remote control of valve assembly unloading. This remote unloading function makes operation more flexible and convenient, further improving the efficiency and performance of engineering machinery. When a large flow rate is required at inlet port two, inlet port two can be supplied with confluence oil via a check valve.

[0015] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the constant differential pressure multi-stage pressure regulating and remote unloading confluence valve group of this utility model.

[0018] Figure 2 This is a schematic diagram of the constant differential pressure multi-stage pressure regulating and remote unloading confluence valve group of this utility model.

[0019] Explanation of reference numerals in the attached diagram: 1. Valve body; 2. Two-position two-way solenoid valve; 3. Transition sleeve; 4. Direct-acting relief valve; 5. One-way valve core; 6. One-way valve seat; 7. Pressure test plug; 8. Spring 2; 9. Spring 1; 10. Spool valve core; 11. Throttling element; 12. Screw plug; P1. Oil inlet 1; P2. Oil inlet 2; T. Oil return port. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] like Figures 1-2 As shown, the constant differential pressure multi-stage pressure regulating and remote unloading confluence valve assembly of this utility model includes: valve body 1, one-way valve core 5, one-way valve seat 6, slide valve core 10, throttling element 11, spring 9, transition sleeve 3, screw plug 12, pressure measuring plug 7, direct-acting relief valve 4, and two-position two-way solenoid valve 2, etc.

[0022] Specifically, the valve body 1 has a spool valve cavity and multiple oil ports, including an oil inlet port P1, an oil inlet port P2, and an oil return port T. The multiple oil ports are connected to the spool valve cavity. It also includes an interface 1 for installing a two-position two-way solenoid valve 2, an interface 2 for installing a direct-acting relief valve 4, an interface 3 for installing a one-way valve seat 6, and an interface 4 for installing a screw plug 12. The spool valve core 10 is installed in the spool valve cavity of the valve body 1 and is elastically supported by a spring 9.

[0023] The one-way valve assembly consists of a one-way valve core 5, a one-way valve seat 6, and a spring 8. The interface 3 is indirectly connected to the oil inlet P1 through the one-way valve core 5. The one-way valve core 5 and the one-way valve seat 6 are detachably fixedly connected and supported by the spring 8, so that the hydraulic oil in the P1 port can flow to the interface 3 through the one-way valve core 5. The interface 3 is connected to the oil inlet P2 through an internal flow channel, and the hydraulic oil in the interface 3 merges with the hydraulic oil in the P2 port. When the oil inlet P2 needs to pass a large flow, the oil inlet P1 can supply oil to the oil inlet P2 through the one-way valve.

[0024] In addition, a pressure-testing plug 7 is provided at the outer end of the one-way valve seat 6. The pressure-testing plug 7 is used to measure the pressure in the hydraulic system and at the same time maintain the system's sealing. The pressure-testing plug can not only effectively seal the openings and interfaces in the system to prevent the leakage of hydraulic fluid under high pressure and ensure the stable operation of the system, but also measure the pressure in the pipeline by connecting a pressure measuring device.

[0025] The direct-acting relief valve 4 is installed on interface two, and the oil inlet of the direct-acting relief valve 4 is connected to the pilot end of the slide valve cavity where the slide valve core 10 is installed. The oil outlet of the direct-acting relief valve 4 is connected to the return oil port T. The relief pressure can be adjusted by adjusting the adjusting bolt of the direct-acting relief valve 4 according to the working requirements of the hydraulic system.

[0026] The direct-acting relief valve 4 is equipped with a two-position two-way solenoid valve 2 connected in parallel at both ends. The oil inlet of the two-position two-way solenoid valve 2 is connected to the slide valve chamber through an oil pipe, while the oil outlet of the two-position two-way solenoid valve 2 is connected to the return oil port T. The two-position two-way solenoid valve 2 is connected in parallel with the direct-acting relief valve 4. Through the cooperation of the two-position two-way solenoid valve 2 and the direct-acting relief valve 4, the functions of overflow and remote control to achieve rapid unloading can be completed. The two-position two-way solenoid valve 2 is installed at interface one through a transition sleeve 3, and interface one is connected to the pilot end of the slide valve core 10.

[0027] Interface 1 is located at one end of valve body 1, and interface 4 is located at the other end of valve body 1; the screw plug 12 is installed on interface 4 at one end of the slide valve core 10, and at the same time interface 4 is connected to oil inlet 2 P2 to form pilot end oil chamber.

[0028] Meanwhile, throttling elements 11 are respectively provided at both ends of the spool valve core 10. The throttling elements 11 maintain the minimum oil pressure at the pilot end. When the hydraulic oil pressure in the inlet port P1 exceeds the one-way valve core 5 and exceeds the elastic force of the spring 9, the spool valve core 10 is pushed to move, and the hydraulic oil is unloaded through the return port T.

[0029] The working principle of the constant differential pressure multi-stage pressure regulating and remote unloading confluence valve group of this utility model is briefly described below.

[0030] According to system requirements, the multi-stage pressure regulating valve assembly of this utility model can achieve unloading at different pressure levels by adjusting the pressure of the direct-acting relief valve.

[0031] During the operation of the hydraulic system, when the actuator needs to overcome a large load (high pressure and low flow condition), when the system pressure reaches the set pressure of the direct-acting relief valve or when the two-position two-way solenoid valve is energized, oil flows in the pilot control oil circuit, and a pressure difference is established at both ends of the spool valve to overcome the spring force and move the valve core, thereby achieving unloading of P1. The two oil inlets P2 independently supply oil directly to the hydraulic actuator.

[0032] When the hydraulic actuator needs to overcome a small load (low pressure, high flow rate), the two-position two-way solenoid valve is de-energized, there is no oil flow in the pilot control oil circuit, and the spool valve closes the unloading valve port under the action of spring force, realizing the combined flow of oil supply from P1 and P2.

[0033] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A constant differential pressure multi-stage pressure regulating and remotely unloading confluence valve assembly, characterized in that, include: Valve body (1), one-way valve assembly, spool valve core (10) and direct-acting relief valve (4); the valve body (1) is provided with a spool valve cavity and multiple oil ports communicating with the spool valve cavity, the multiple oil ports being oil inlet one (P1), oil inlet two (P2) and oil return port (T). The one-way valve assembly is installed at the interface three connected to the first oil inlet (P1), and the third interface is connected to the second oil inlet (P2) through an internal flow channel, so as to realize the combined oil supply of the first oil inlet (P1) and the second oil inlet (P2). The spool valve core (10) is installed in the spool valve cavity, and one pilot end of the spool valve core (10) is connected to the second oil inlet (P2). The other pilot end of the spool valve core (10) is connected to the return oil port (T) through the direct-acting relief valve (4). At the same time, the spool valve core (10) is also provided with a throttling element (11). By adjusting the pressure of the direct-acting relief valve (4) and replacing the throttling element (11) with different orifice sizes, unloading of different pressure ranges can be achieved.

2. The constant differential pressure multi-stage pressure regulating and remotely unloading confluence valve assembly according to claim 1, characterized in that, The direct-acting relief valve (4) is equipped with a two-position two-way solenoid valve (2) in parallel at both ends, which can quickly unload the pilot end.

3. The constant differential pressure multi-stage pressure regulating and remotely unloading confluence valve assembly according to claim 2, characterized in that, The two-position two-way solenoid valve (2) is connected to the interface at one end of the valve body (1) through a transition sleeve (3).

4. The constant differential pressure type multi-stage pressure regulating and remotely unloading confluence valve assembly according to claim 3, characterized in that, The valve body (1) has an interface four for installing a screw plug (12) at the other end, and the interface four is connected to the oil inlet (P2).

5. The constant differential pressure type multi-stage pressure regulating and remotely unloading confluence valve assembly according to claim 1, characterized in that, The one-way valve assembly includes a one-way valve core (5) and a one-way valve seat (6), the one-way valve seat (6) being installed in the interface three.

6. The constant differential pressure type multi-stage pressure regulating and remotely unloading confluence valve assembly according to claim 5, characterized in that, The one-way valve core (5) and the one-way valve seat (6) are connected by a spring (8).

7. The constant differential pressure multi-stage pressure regulating and remotely unloading confluence valve assembly according to claim 5, characterized in that, The one-way valve seat (6) is provided with a pressure measuring plug (7) at its outer end.

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