CN204437427U - Hydraulic sluice valve opening/closing control structure - Google Patents

Abstract

The utility model relates to an opening and closing control structure of a hydraulic gate valve, which has a hydraulic cylinder body for installing a piston, a slide rod for opening and closing the hydraulic gate valve, a large piston and a small piston are arranged in the hydraulic cylinder body, and the small piston is placed in the large In the piston, the outer cylinder of the small piston is in sliding fit connection with the inner hole of the large inner piston, and the small piston is fixedly connected with the slide rod. The utility model changes the original single-piston hydraulic device, and changes the original hydraulic device into a large and small piston matching device, which is creative; it is suitable for various types of hydraulic gate valves, and is designed according to the requirements of hydraulic opening and closing forces to achieve opening and closing of different sizes. Closing force, strong practicability; large and small pistons work together, according to the opening and closing force requirements of different hydraulic gate valves, the area ratio of large and small pistons can be designed separately, so as to realize fast and smooth opening and closing of hydraulic machinery, with novel features sex.

Description

Hydraulic gate valve opening and closing control structure

technical field

The utility model relates to a hydraulic gate valve, in particular to an opening and closing control mechanism of the hydraulic gate valve.

Background technique

The hydraulic gate valve converts the driving pressure of the system into the upward or downward movement of the valve plate through the opening and closing control mechanism to realize the opening and closing of the gate valve. Hydraulic gate valves are widely used in systems in petroleum, chemical industry, marine engineering, ships and other fields.

Under the same driving pressure conditions, the opening and closing control structure of the ordinary hydraulic gate valve produces the same opening force and closing force. Therefore, in actual use, the opening driving pressure of the gate valve must be greater than the closing driving pressure, otherwise it will easily cause the problem of opening sticking , which will greatly affect the normal operation of the system.

Contents of the invention

The purpose of the utility model is to overcome the disadvantages of the opening and closing control structure of the common hydraulic gate valve, which cannot adjust the opening and closing force under the same hydraulic working pressure, and provide a hydraulic gate valve opening and closing control structure. The combined design can better control the ratio of the opening and closing force and realize the purpose of smooth opening and closing of the equipment.

In order to achieve the above purpose, the technical solution of the present invention is: a hydraulic gate valve opening and closing control structure, which has a hydraulic cylinder body for installing a piston, and a sliding rod for hydraulic gate valve opening and closing, which is characterized by: Large and small pistons are installed in the hydraulic cylinder, the small piston is placed in the large piston, the outer cylinder of the small piston is slidingly fitted with the inner hole of the large inner piston, and the small piston is fixedly connected with the slide rod.

The diameter D1 of the inner hole of the large piston is equal to the outer diameter D2 of the outer cylinder of the small piston, and the outer diameter D3 of the large piston>D2.

The lower end of the hydraulic cylinder body is equipped with a limiting device for closing and limiting the large piston.

The beneficial effects of the utility model are:

1. The original single-piston hydraulic device is changed, and the original hydraulic device is changed into a large and small piston matching device, which is creative.

2. The new hydraulic control structure is suitable for various types of hydraulic gate valves. It is designed according to the hydraulic opening and closing force requirements to achieve different sizes of opening and closing forces and has strong practicability.

3. The hydraulic opening and closing force control structure is composed of large and small pistons working together. According to the opening and closing force requirements of different hydraulic gate valves, the area ratio of the large and small pistons can be designed separately, so as to realize fast and smooth opening and closing of hydraulic machinery. novelty.

Description of drawings

Figure 1 is an overall structural diagram of a hydraulic gate valve;

Fig. 2 is a partial enlarged view of A of the opening and closing control structure in Fig. 1;

Fig. 3 is the structural representation of large piston;

Fig. 4 is a structural schematic diagram of the small piston.

Detailed ways

Embodiments of the utility model are described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the application of the hydraulic gate valve opening and closing control structure of the present invention on a hydraulic gate valve, the large and small pistons are installed in the hydraulic cylinder body of the gate valve.

As shown in Figure 2, the opening and closing control structure of the hydraulic gate valve of the present invention includes a hydraulic cylinder body 1, a slide rod 5, large and small pistons 2, 3, and a limit device 4, etc.

The large and small pistons 2 and 3 are installed in the hydraulic cylinder body 1, the small piston 3 is placed in the large piston 2, the outer cylinder of the small piston 3 is connected with the inner hole of the large inner piston 2 by sliding fit, and the small piston 3 is connected with the sliding rod 5 Fixed connection. The lower end of the hydraulic cylinder body 1 is equipped with a limiting device 4, which is used for closing and limiting the large piston 2.

As shown in Figures 3 and 4, the diameter D1 of the inner hole of the large piston 2 is equal to the outer diameter D2 of the outer cylinder of the small piston 3, and the outer diameter D3 of the large piston 2>D2.

The utility model combines the large and small pistons in the hydraulic cavity in the gate valve opening and closing control structure, calculates the forces of different sizes required for hydraulic opening and closing, and designs large and small pistons (Figure 3 and Figure 4), large and small pistons respectively. Piston matching dimension D1=D2, outer diameter D3>D2. The large and small pistons are assembled in the hydraulic cylinder, there is relative sliding between the two, and the O-ring is used for sealing, and a limit device is designed in the hydraulic cylinder to close the large piston (Figure 2). Under the action of the same working medium pressure P, the closing force of the device is smaller than the opening force, so as to achieve the purpose of smooth opening and closing of the hydraulic structure.

As shown in Figure 1, this embodiment designs a hydraulic opening and closing force characteristic for the opening and closing force of the hydraulic gate valve (closing force and opening force are in a linear relationship, the greater the closing force, the greater the opening force, and the opening force is greater than the closing force). The force control structure adopts the combined action principle of large and small pistons. When closing, use the small piston (sliding rod connection seat) to act on the gate valve to limit the position of the large piston (as shown in Figure 4); when opening, the large and small pistons act simultaneously to push the gate valve open; under the same working water pressure, the When the gate valve is normally sealed, the closing pressure is small and the opening pressure is large, which avoids abnormal conditions such as gate valve sticking. The specific opening and closing process is as follows: Under the action of the working water pressure in the lower chamber, the large piston in the gate valve cylinder first moves to contact with the sliding rod connecting seat (small piston), and then the valve plate is gradually moved through the pull rod under the action of the working water pressure. Open to realize the opening function of the gate valve. When the gate valve is closed, the pressure water in the upper chamber will gradually close the valve plate together with the sliding rod connecting seat (small piston). When the gate valve is closed in place, the large piston will continue to run down to the bottom of the cylinder without contacting the small piston. , so the closing force of the valve plate is generated by the working water acting on the small piston.

Claims (3)

1. A hydraulic gate valve opening and closing control structure has a hydraulic cylinder block (1) for installing a piston, and a slide bar (5) for hydraulic gate valve opening and closing, characterized in that: the hydraulic cylinder block (1) ) are equipped with large and small pistons (2, 3), the small piston (3) is placed in the large piston (2), the outer cylinder of the small piston (3) is connected with the inner hole of the large internal piston (2) by sliding fit, the small Piston (3) is fixedly connected with slide bar (5). 2. The opening and closing control structure of hydraulic gate valve according to claim 1, characterized in that: the inner diameter D1 of the large piston (2) is equal to the outer diameter D2 of the outer cylinder of the small piston (3), and the large piston ( 2) The outer diameter D3>D2. 3. The hydraulic gate valve opening and closing control structure according to claim 1 or 2, characterized in that: the lower end of the hydraulic cylinder (1) is equipped with a limit device (4), which is used to limit the closing of the large piston (2).