CN218971536U

CN218971536U - Load-sensitive multi-way valve working valve body

Info

Publication number: CN218971536U
Application number: CN202223375186.8U
Authority: CN
Inventors: 王全东; 王海宇
Original assignee: Tianjin Haifu Hydraulic Technology Co ltd
Current assignee: Tianjin Haifu Hydraulic Technology Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-05-05
Anticipated expiration: 2032-12-07

Abstract

The utility model discloses a working valve body of a load-sensitive multi-way valve, which comprises a valve body formed by processing an integral casting, wherein the valve body comprises a main valve, a pressure compensation valve, an overflow valve and an inter-plate shuttle valve, and a working oil port, an oil return port and a load-sensitive oil port which are connected with an executing mechanism are arranged on the valve body; an electromagnetic pipe cavity, a load sensitive oil cavity, an oil return cavity, a working oil cavity and an oil inlet cavity I which are sequentially communicated are formed between the valve core and the valve hole of the main valve, and the electromagnetic pipe cavity, the load sensitive oil cavity, the oil return cavity and the working oil cavity are two groups and are symmetrically distributed relative to the oil inlet cavity I; the valve core and the valve hole of the pressure compensation valve are sequentially communicated with a second oil inlet cavity, a second oil outlet cavity and a spring cavity, and the second oil inlet cavity is communicated with an oil inlet of the pressure compensation valve through a streamline flow passage; the oil outlet cavity is communicated with the oil inlet cavity I through a streamline flow passage; the spring cavity is communicated with the load sensitive oil cavity; the utility model has the advantages of simple structure, reasonable design, convenient installation and maintenance, and universality and flexibility.

Description

Load-sensitive multi-way valve working valve body

Technical Field

The utility model belongs to the technical field of load-sensitive systems, and particularly relates to a working valve body of a load-sensitive multi-way valve.

Background

A load-sensitive system is a hydraulic circuit that senses system pressure and flow demand to provide the required flow and pressure. The load sensitive multiway valve is a control element of a hydraulic system of engineering machinery and is positioned between a power element (a pump) and an actuating element (a motor or an oil cylinder), and when each actuating element works normally, the working flow is only related to the opening degree of a valve core and is not related to the load pressure. At present, the appearance of a valve body of a load-sensitive multiway valve is mostly simple, but the internal oil duct of the valve body is designed with complex inner cavities with different shapes and narrow and long special-shaped hole grooves, so that the processing difficulty is high, and the roundness and cylindricity of key positions cannot be ensured. Therefore, the multi-way valve body has reasonable and compact design structure, large through flow, small energy loss and reliable performance, and has great practical value in the field of engineering machinery.

The valve body of the existing load-sensitive multiway valve reversing unit comprises valve cores, shuttle valves, pressure compensation valves, safety valves, oil ducts and the like for controlling all actuating mechanisms. When the reversing unit works, the pressure of the working oil port of the closed system enters the load sensitive oil cavity through the oil hole on the corresponding valve core and is selectively led out through the shuttle valve. And then the working oil pressure (signal oil pressure) is transmitted to the oil inlet unit through the shuttle valve and is fed back to the load sensitive pump, so that the load sensitive function of the system is realized. For the starting system, working oil pressure led out by the shuttle valve is directly transmitted to the pressure compensation valve of the oil inlet unit, so that the load sensitive function of the system is realized.

The defects of the existing load-sensitive multiway valve body are as follows:

1) In order to realize load sensitive control, the existing multi-way valve body has a large overall structure, occupies more space, is not compact in structure and brings more inconvenience to installation;

2) At present, most of the flow channels and valve core holes of the load-sensitive multi-way valve are obtained through machining, so that machining is difficult, streamline intersection of inner holes cannot be realized, and energy loss is increased.

In view of this, the present utility model has been made.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model aims to provide the working valve body of the load-sensitive multiway valve, which has the advantages of simple and compact structure, reasonable design, convenient installation and maintenance, and the internal oil duct is designed in a streamlined manner, so that the loss of flow and pressure in working is greatly reduced, the processing difficulty is reduced, the precision of a main hole is improved, and the working valve has universality and flexibility.

In order to achieve the above purpose, the working valve body of the load-sensitive multiway valve provided by the utility model comprises a valve body formed by integrally casting, wherein the valve body comprises a main valve, a pressure compensation valve, an overflow valve and an inter-plate shuttle valve, and a working oil port, an oil return port and a load-sensitive oil port which are connected with an executing mechanism are arranged on the valve body;

an electromagnetic pipe cavity, a load sensitive oil cavity, an oil return cavity, a working oil cavity and an oil inlet cavity I which are sequentially communicated are formed between the valve core and the valve hole of the main valve, and the electromagnetic pipe cavity, the load sensitive oil cavity, the oil return cavity and the working oil cavity are two groups and are symmetrically distributed relative to the oil inlet cavity I; the two electromagnetic tube cavities are communicated with each other and the oil return port; the two load-sensitive oil cavities are communicated with each other and are communicated with an oil return port through an overflow valve, and the load-sensitive oil cavities transmit pressure information to the load-sensitive oil ports through an inter-chip shuttle valve; the two oil return cavities are respectively communicated with the two oil return ports through streamline flow channels; the two working oil cavities are respectively communicated with the two working oil ports through streamline flow channels;

the valve core and the valve hole of the pressure compensation valve are sequentially communicated with a second oil inlet cavity, an oil outlet cavity and a spring cavity, and the second oil inlet cavity is communicated with an oil inlet of the pressure compensation valve through a streamline flow passage; the oil outlet cavity is communicated with the oil inlet cavity I through a streamline flow channel; the spring chamber is in communication with the load-sensitive oil chamber.

Preferably, the end part of the pressure compensation valve is provided with a mounting hole, and a hollow cylindrical pin connected with a valve core of the pressure compensation valve is arranged in the mounting hole;

preferably, the flow change among the load sensitive oil cavity, the oil return cavity, the working oil cavity and the oil inlet cavity I is controlled by a valve core of the main valve;

preferably, the flow change between the oil inlet of the pressure compensation valve and the oil outlet cavity of the pressure compensation valve is controlled by the pressure compensation valve.

The working valve body of the load-sensitive multi-way valve has the following beneficial effects:

1. the utility model effectively solves the technical problems of the prior art that the structure is not compact, more space is occupied, the installation is inconvenient, the design is unreasonable and the capacity loss is large. According to the utility model, the valve body is formed by processing the integral casting, so that the volume of the internal flow channel is increased as much as possible, and meanwhile, the streamline flow channel is adopted to reduce sharp right angles and edges formed by processing, so that the resistance of the oil flowing process is reduced, the energy loss is reduced, the oil duct is concise, the transition between the cavities is smooth, the structure is reasonable and compact, the installation is convenient, and the maintenance is convenient. When the valve body is used for making the reversing joint work, the pressure difference between the inlet and the outlet of the main valve is ensured to be constant, so that each working joint can work independently, and the flow of the system is only related to the working stroke of the main valve. When the working joint valve body works, the overload oil supplementing valve, the oil supplementing valve or the thread plug and other functions can be selected functionally, so that the valve body has the advantages of universality and flexibility, and the manufacturing cost is reduced. The combination of different functions and structures can realize the control requirements of hydraulic systems of different hosts, realize the multiple purposes of one valve and reduce the processing and manufacturing cost of the multi-way reversing valve.

2. The mounting hole is designed at the end part of the pressure compensation valve, the hollow cylindrical pin is assembled inside, the cylindrical pin can be used as a positioning pin of a valve core of the pressure compensation valve, a fixing bolt can also be allowed to pass through, the volume of the valve body is greatly reduced, the valve body is compact in structure and convenient to install, and the universality and the flexibility of functions can be realized by machining different holes in the valve body.

Drawings

Fig. 1 is a schematic structural diagram of a working valve body of a load-sensitive multiway valve.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a schematic structural diagram of a working valve body of a load-sensitive multiway valve provided by the utility model.

Fig. 4 is a schematic structural diagram of a working valve body of a load-sensitive multiway valve provided by the utility model.

In the figure:

1. valve body 2, main valve core 3, pressure compensating valve 4, overflow valve 5, shuttle valve 6 between sheets, oil inlet 7, working oil port 8, electromagnetic pipe cavity 9, load sensitive oil cavity 10, oil return cavity 11, working oil cavity 12, oil inlet cavity one 13, oil return port 14, mounting hole 15, load sensitive oil port 16, oil inlet cavity two 17, oil outlet cavity 18, spring cavity.

Detailed Description

The utility model will be further described with reference to specific examples and figures to aid in the understanding of the utility model.

As shown in fig. 1-4, the working valve body of the load-sensitive multiway valve provided by the utility model comprises a valve body 1 formed by integrally casting, wherein the valve body 1 comprises a main valve 2, a pressure compensation valve 3, an overflow valve 4 and an inter-plate shuttle valve 5, and a working oil port 7, an oil return port 13 and a load-sensitive oil port 15 which are connected with an actuating mechanism are arranged on the valve body 1.

As shown in fig. 1, an electromagnetic pipe cavity 8, a load sensitive oil cavity 9, an oil return cavity 10, a working oil cavity 11 and an oil inlet cavity I12 which are sequentially communicated are formed between a valve core of the main valve 2 and a valve hole, and the electromagnetic pipe cavity 8, the load sensitive oil cavity 9, the oil return cavity 10 and the working oil cavity 11 are two groups and are symmetrically distributed relative to the oil inlet cavity I12. The flow rate change among the load sensitive oil cavity 9, the oil return cavity 10, the working oil cavity 11 and the oil inlet cavity I12 is controlled by the valve core of the main valve 2. As shown in fig. 3, the two electromagnetic tube cavities 8 are communicated with each other and the oil return port 13. As shown in fig. 1 and 4, the two load-sensitive oil chambers 9 are communicated with each other and are communicated with an oil return port 13 through an overflow valve 4, and the load-sensitive oil chambers 9 transmit pressure information to a load-sensitive oil port 15 through an inter-vane shuttle valve 5. The two oil return cavities 10 are respectively communicated with the two oil return ports 13 through streamline flow passages, and the two working oil cavities 11 are respectively communicated with the two working oil ports 7 through streamline flow passages.

As shown in fig. 1, an oil inlet cavity II 16, an oil outlet cavity 17 and a spring cavity 18 are sequentially formed between a valve core and a valve hole of the pressure compensation valve 3, and the oil inlet cavity II 16 is communicated with an oil inlet 6 of the pressure compensation valve 3 through a streamline flow passage; the oil outlet cavity 17 is communicated with the oil inlet cavity I12 through a streamline flow passage. The spring chamber 18 communicates with the load-sensitive oil chamber 9. The flow change between the oil inlet 6 of the pressure compensating valve 3 and the oil outlet chamber 17 of the pressure compensating valve 3 is controlled by the pressure compensating valve 3. The end of the pressure compensation valve 3 is provided with a mounting hole, and a hollow cylindrical pin connected with a valve core of the pressure compensation valve 3 is arranged in the mounting hole.

The working principle of the utility model is as follows: initially, the pressure oil provided by the oil inlet 6 of the pressure compensation valve 3 enters the oil inlet cavity II 16 of the pressure compensation valve 3 through the valve hole of the pressure compensation valve 3, then compresses the spring of the spring cavity 18 of the pressure compensation valve 3 under the action of the pressure oil, pushes the valve core of the pressure compensation valve 3 to move, so that the pressure oil enters the oil outlet cavity 17 of the pressure compensation valve 3, and the pressure oil enters the oil inlet cavity I12 of the main valve 2 through the inner streamline flow passage. The load sensitive oil cavities 9 on the two sides of the first oil inlet cavity 12 are communicated with the spring cavity 18 of the pressure compensation valve 3, and a feedback signal is transmitted to the inter-chip shuttle valve 5 to be compared and selected with the next feedback signal. The pressure oil introduced by the load sensitive oil cavity 9 acts on the spring cavity 18 of the pressure compensating valve 3, and the pressure difference between the front and the back of the main valve 2 is kept constant by the spring in the spring cavity 18 of the pressure compensating valve 3, so that the flow rate flowing to the working oil port 7 is only related to the throttle opening of the main valve 2. The load pressure oil of the working oil port 7 enters a load sensitive oil cavity 9 through the main valve 2, a feedback signal is fed back to the inter-vane shuttle valve 5, a high-pressure signal is fed back to a load sensitive control port or an oil inlet unit of the pump through the inter-vane shuttle valve 5, the change of the swing angle of the variable pump is controlled or the movement of a valve core of the oil inlet unit pressure compensation valve 3 is controlled, and therefore the load sensitive function of the system is realized.

The working valve body of the load-sensitive multi-way valve provided by the utility model has the advantages that the hydraulic system control requirements of different hosts can be realized by combining different functions and structures, the multi-purpose valve is realized, the processing and manufacturing cost of the multi-way reversing valve is reduced, and when an actuating mechanism needs to be provided with an overload valve or an oil supplementing valve, the corresponding functions can be increased by adding the threaded insertion holes, so that the valve body 1 has the advantages of universality and flexibility.

Specific examples are set forth herein to illustrate the utility model in detail, and the description of the above examples is only for the purpose of aiding in understanding the core concept of the utility model. It should be noted that any obvious modifications, equivalents, or other improvements to those skilled in the art without departing from the inventive concept are intended to be included in the scope of the present utility model.

Claims

1. The working valve body of the load-sensitive multiway valve is characterized by comprising a valve body formed by processing an integral casting, wherein the valve body comprises a main valve, a pressure compensation valve, an overflow valve and an inter-plate shuttle valve, and a working oil port, an oil return port and a load-sensitive oil port which are connected with an executing mechanism are arranged on the valve body;

2. The load sensitive multiway valve working coupler body of claim 1, wherein the end of the pressure compensating valve has a mounting hole, and wherein the mounting hole is internally provided with a hollow cylindrical pin connected with the valve core of the pressure compensating valve.

3. The working manifold of claim 1, wherein the flow rate variation between the load sensing oil chamber, the oil return chamber, the working oil chamber and the first oil inlet chamber is controlled by a spool of the main valve.

4. The load-sensitive multiway valve working manifold of claim 2, wherein the flow change between the oil inlet of the pressure compensating valve and the oil outlet chamber of the pressure compensating valve is controlled by the pressure compensating valve.