CN204226323U - The heavily loaded electrohydraulic control actuating valve door system that band compensates - Google Patents

Abstract

The utility model provides a heavy-duty electro-hydraulic actuator-driven valve system with compensation, and the problem to be solved is: CN101709807 is restricted by a spring, so that it cannot be applied to a heavy-duty electro-hydraulic actuator-driven valve system. The main points of the utility model are: it includes the connection between the piston rod of the driving cylinder and the valve rod of the heavy-duty valve. The positive effect of the utility model is: it relies on the spring and the compensating oil cylinder to absorb, store and release energy, and the spring is not the only one associated, which solves the problem of being restricted by the spring, and can be applied to the heavy-duty electro-hydraulic actuator to drive the valve system. The reliable operation of the valve system driven by the heavy-duty electro-hydraulic actuator is guaranteed.

Description

Heavy-duty electro-hydraulic actuator-driven valve system with compensation

technical field

The utility model relates to a valve system driven by an electro-hydraulic actuator, in particular to a valve system driven by a heavy-duty electro-hydraulic actuator with a compensation function. The said heavy-duty electro-hydraulic actuator of the utility model refers to that the force output by its drive oil cylinder is greater than 10 tons.

Background technique

Electrohydraulic actuator drive valve system includes electrohydraulic actuator and valve, electrohydraulic actuator includes drive cylinder and integrated electrohydraulic actuator (see CN1865746A integrated power source), drive cylinder piston rod is connected with valve stem, piston The rod drives the valve stem to reciprocate, controlling the opening, closing or position retention of the valve. The above-mentioned systems are divided into two types of electro-hydraulic actuator-driven valve systems, heavy-duty and light-duty, according to the size of the load (valve) (that is, the output force of the driving cylinder is different from small to large). In this paper, the driving cylinder output force of 10 tons is taken as the critical point, and the driving cylinder output force greater than 10 tons is a heavy-duty electro-hydraulic actuator to drive the valve system; the driving cylinder output force is less than 10 tons is a light electro-hydraulic actuator drive the valve system. Regardless of the heavy-duty or light-load electro-hydraulic actuator-driven valve system, it will appear during operation that the components of the valve will expand due to temperature rise. If there is no device to absorb these expansion forces, parts such as valves and cylinder piston rods will be deformed or even damaged; gaps will be generated due to valve wear, etc. These will affect the reliability of the above system.

In order to compensate for the above changes, CN101709807 discloses a linear compensator, which automatically compensates for changes in valves and their valve stems, cylinder piston rods and other components by setting springs. The spring it uses is proportional to the load (that is, the force output by the drive cylinder), and the load is only associated with the spring. The greater the load, the larger the spring required. When the load is large to a certain extent, such as when it is applied to a heavy-duty electro-hydraulic actuator to drive a valve system, its spring will have problems such as manufacturing and cost. Therefore, the application of CN101709807 is restricted by the spring, and it is generally applicable to the light-load electro-hydraulic actuator-driven valve system (that is, the output force of the driving cylinder is less than 10 tons), and cannot be applied to the heavy-duty electro-hydraulic actuator-driven valve system, that is, it cannot be solved. Compensation problems for valve systems driven by heavy-duty electro-hydraulic actuators.

Contents of the invention

In order to solve the compensation problem of the valve system driven by the heavy-duty electro-hydraulic actuator, the purpose of the utility model is to provide a valve system driven by the heavy-duty electro-hydraulic actuator with compensation.

The purpose of this utility model is achieved in this way: it includes the connection between the piston rod of the driving cylinder and the valve rod of the heavy-duty valve. The drive cylinders are connected in parallel (the A chamber oil ports of the two oil cylinders are connected, and the B chamber oil ports of the two oil cylinders are connected).

When the valve is fully closed or under load, if the valve and other components expand due to temperature rise, the piston rod of the drive cylinder is retracted, and the piston moves upward, that is, the A cavity, and the oil pressure in the A cavity of the drive cylinder will increase. The hydraulic oil in chamber A of the driving cylinder will be injected into the chamber A of the compensation cylinder, and the piston of the compensation cylinder will move to its chamber B under pressure. Rod and piston rod are bent; when the pressure in cavity A of the driving cylinder and the compensating cylinder drops, the piston rod of the compensating cylinder is retracted under the action of the spring, and the oil temporarily stored in the compensating cylinder is returned to the driving cylinder of the main system In order to ensure the driving force of the valve.

Compared with CN101709807, the positive effect of the utility model is that it relies on the spring and the compensating oil cylinder to absorb, store and release energy together, and the spring is not the only one associated. Applying the utility model to the same heavy-duty electro-hydraulic actuator-driven valve system, the spring used does not need to be as large as the spring of CN101709807, so it solves the problem of CN101709807 being restricted by the spring, and further solves the problem of heavy-duty electro-hydraulic actuators. The compensation problem of the valve system driven by the actuator ensures the reliable operation of the valve system driven by the heavy-duty electro-hydraulic actuator.

Description of drawings

Further illustrate the utility model below in conjunction with accompanying drawing.

Fig. 1 is the schematic diagram of the utility model.

Detailed ways

Heavy-duty electro-hydraulic actuator drive valve system includes electro-hydraulic actuator and heavy-duty valve 6, electro-hydraulic actuator includes drive cylinder 3 and integrated electro-hydraulic actuator 4, drive cylinder piston rod 31, connecting mechanism 5 and heavy-duty valve The valve rods 61 are connected in turn, and the piston rod drives the valve rod to reciprocate, controlling the opening, closing or position retention of the heavy-duty valve.

It also includes a compensating cylinder 2 and a spring 1, the piston rod 21 of the compensating cylinder bears on the spring, and the compensating cylinder and the driving cylinder are connected in parallel (the ports of chamber A of the two cylinders are connected, and the ports of chamber B of the two cylinders are connected). The initial pressure value P ₀ of the compensation cylinder action can be set by setting the spring preload value, specifically, spring preload = initial pressure value × compensation cylinder piston area, where initial pressure value = drive cylinder rated output value / Drive cylinder piston area.

When the heavy-duty valve is fully closed or under load, if the valve, valve stem, and piston rod of the driving cylinder expand due to temperature rise, the piston of the driving cylinder will tend to move upward, and the oil pressure in cavity A of the driving cylinder will increase. , when the pressure exceeds the initial setting pressure P ₀ of the compensation cylinder, the piston rod of the driving cylinder is retracted, and the piston moves upward, that is, chamber A, and the oil pressure in chamber A of the driving cylinder will rise, and the hydraulic oil in chamber A of the driving cylinder will It will be injected into the A chamber of the compensation cylinder, the piston of the compensation cylinder is pressed to move to its B chamber, the piston rod of the compensation cylinder is stretched out, and the spring is compressed, and the expansion is absorbed by the spring to avoid the bending of the valve rod and the piston rod. This process will Continue until the upward movement of the driving cylinder piston disappears; when the pressure in the A cavity of the driving cylinder and the compensating cylinder drops, the piston rod of the compensating cylinder will retract under the action of the spring, and the temporary storage in the compensating cylinder will be The oil returns to the main system driving cylinder to ensure the driving force of the valve.

Claims (2)

1. the heavily loaded electrohydraulic control actuating valve door system with compensation, it comprises driving cylinder piston rod and is connected with the valve rod of heavily loaded valve, it is characterized in that: further comprising compensating cylinder and spring, the piston rod of compensating cylinder withstands on spring, compensating cylinder and the parallel connection of driving oil cylinder.

2. according to the heavily loaded electrohydraulic control actuating valve door system that band according to claim 1 compensates, it is characterized in that: said spring, its pretightening force=initial pressure value × compensating cylinder piston area, wherein initial pressure value=driving oil cylinder nominal output value/driving oil cylinder piston area.