CN203809727U - water spray control valve - Google Patents

Abstract

A water spray regulating valve comprises a valve body, a valve rod and a valve core, wherein the lower end of the valve rod extends into a middle cavity of the valve body, a valve seat is installed at the bottom of the middle cavity of the valve body, and the lower end of the valve rod is provided with the valve core which can be matched with the valve seat to realize the on-off of a fluid channel in the valve body; the valve seat is sequentially provided with a flow stabilizing assembly and a flow equalizing cover from top to bottom; the utility model provides a water spray regulating valve, under the condition that the valve core lift is high, fluid medium enters from the inlet of the flange short pipe, and because a plurality of shunt tubes are arranged in the flange short pipe, the fluid can be shunted by the shunt tubes, so that the flowing speed of the medium is limited, and then the fluid impacts the pore plate, thereby avoiding the fluid flowing at high speed from directly impacting the pore plate and damaging the pore plate; fluid after through the orifice plate still need can flow through the hole of flow equalizing that flow equalizes the cover, through the orifice plate, flow equalize the continuous step-down that covers, pressure remains at atmospheric pressure intelligence quotient all the time to can avoid the destruction that cavitation phenomenon arouses, improve the operational reliability of valve.

Description

water spray control valve

technical field

The utility model relates to the technical field of a water spray regulating valve, in particular to a decompression structure of a water spray regulating valve.

Background technique

The water spray regulating valve is mainly used to control the flow rate of the desuperheating water required for the main steam and reheating steam temperature of the boiler. It is one of the key components used to precisely adjust the steam temperature control. Well-adjusted steam temperature control can keep the throttling temperature at set point, thus ensuring the efficient operation of the steam turbine. However, due to the large pressure difference between the inlet and outlet of the desuperheating and water spraying regulating valve in the main steam system, serious cavitation will occur for the desuperheating and water spraying regulating valve of ordinary structure, which will damage the valve core. The destructive force of the valve shaft is very large, which seriously damages the sealing surface of the valve seat, affects the normal use of the regulating valve, and causes the unit to fail to operate normally. In the traditional technology, a hollow cylinder composed of several orifice plates is used to reduce the fluid flow rate. The fluid passes through the small holes on the orifice plate and is divided into several tributaries to reduce the fluid flow rate and pressure. The disadvantages are: because of the high-speed flow The fluid directly impacts on the orifice plate, and then is shunted by the small holes. Long-term use will easily cause great damage to the orifice plate, and then cause damage to the valve body.

Contents of the invention

In order to overcome the above problems, the utility model provides a water spray regulating valve, which overcomes the technical problems of short service life and easy damage of the orifice plate in the traditional technology.

In order to achieve the above object, the technical solution provided by the utility model is:

A water spray regulating valve, comprising a valve body, a valve stem and a valve core, the lower end of the valve stem goes deep into the middle cavity of the valve body, a valve seat is installed at the bottom of the middle cavity of the valve body, and the lower end of the valve stem is provided with a Cooperate with the valve core to realize the on-off of the fluid channel in the valve body; the valve seat is provided with a steady flow assembly and a flow equalization cover in sequence from top to bottom; the flow equalization cover is a hollow cylinder, and the circumferential direction of the lower part of the flow equalization cover is uniform There are a number of square flow equalizing holes; the steady flow assembly includes a number of shunt pipes and short flange pipes; the inlet and outlet of the short flange pipes are respectively connected with the inlet and outlet of the valve body, and a number of shunt pipes are arranged on the flange In the short pipe, the outlet of each shunt pipe is connected with the square flow equalization hole of the flow equalization cover; a cutout that can accommodate the valve core is provided at the position of the flange short pipe and the shunt pipe below the valve core, and the valve core and the valve core The rod is fixedly connected, so that the valve core can be controlled by the valve rod to go deep into the cutout to block the connection between the flange short pipe and the shunt pipe outlet and inlet.

An orifice plate is also provided at the end of the flange short pipe and the outlet of the shunt pipe, and a number of small holes are arranged on the orifice plate, and the several small holes communicate with the outlet of each shunt pipe and the gap between adjacent shunt pipes, each The cross-sectional area of each small hole is smaller than the cross-sectional area of the outlet of the shunt pipe and the gap between the adjacent shunt pipes.

The short flange pipe and the shunt pipe are arranged in a Z shape, the inlet position of the short flange pipe and the shunt pipe is higher than the outlet position, and a cutout for accommodating the spool is arranged at one end of the short flange pipe and the outlet position of the shunt pipe.

The benefits of the above technical solution are:

1. This new model provides a water spray regulating valve. When the lift of the valve core is high, the fluid medium enters from the inlet of the flange short pipe. Because there are multiple shunt pipes in the flange short pipe, the fluid will be diverted. The pipe shunts, so that the speed of the medium flowing out is limited, and then impacts on the orifice plate, avoiding the high-speed flowing fluid directly impacting on the orifice plate, causing damage to the orifice plate; after passing through the orifice plate, the fluid needs to pass through the flow equalization cover Only through the equalizing hole can the flow out, through the continuous depressurization of the orifice plate and the equalizing cover, the pressure is always maintained at the air pressure IQ, so as to avoid damage caused by cavitation and improve the operating reliability of the valve.

2. The cross-sectional area of the small hole set on the orifice plate of the new model is smaller than the cross-sectional area of the outlet of the shunt pipe and the gap between adjacent shunt pipes, so when the fluid in the shunt pipe and between the shunt pipes passes through the orifice plate, it will It is blocked by the orifice plate to further limit the speed, which further ensures the reliability of the valve operation.

3. The new model can further restrict the flow rate of the fluid medium by setting the flange short pipe and the shunt pipe in a Z row, and the inlet position is higher than the outlet position, so as to ensure the operation reliability of the orifice plate and the valve; and because the cutout It is located at one end of the flange short pipe and the outlet of the shunt pipe, and the valve stem is fixedly connected with the valve core. The valve core can be lowered into the cutout through the valve stem, so that the end of the flange short pipe and the inlet end of the shunt pipe is connected with the outlet end. Blocking, which prevents fluid from passing through.

Below in conjunction with accompanying drawing and specific embodiment the present invention will be further described.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is a schematic cross-sectional view of the novel flow stabilization component.

Detailed ways

Example 1

A water spray control valve as shown in Figure 1 and Figure 2, including a valve body 1, a valve seat 2, a steady flow assembly 3, a valve stem 4, a flow equalizing cover 5 and a valve cover 6; the valve cover 6 is located on The top of the valve body 1, a metal gasket is provided between the valve cover 6 and the valve body 1, the valve seat 2 is installed at the bottom of the middle cavity of the valve body 1, and a metal gasket is installed between the valve seat 2 and the bottom step surface of the valve body 1 middle cavity. gasket; on the valve seat 2, a flow stabilization assembly 3 and a flow sharing cover 5 are installed sequentially from bottom to top; the flow sharing cover 5 is a hollow cylinder, and the lower part of the flow sharing cover 5 is evenly distributed A square flow equalizing hole, the bottom of the square flow equalizing hole communicates with the outlet of the flow stabilization assembly 3; the flow stabilization assembly 3 is located inside the valve body 1, and the flow stabilization assembly 3 includes several shunt pipes 30 and short flange pipes 31; The inlet and the outlet of the flange short pipe 31 are respectively sealed and connected with the inlet 100 and the outlet 101 on the valve body, the flange short pipe 31 is arranged in a Z shape, and the flange short pipe 31 inlet is higher than the flange short pipe 31 outlet; The shunt pipes 30 are all arranged in the flange short pipe 31, and the shape of the shunt pipe 31 is consistent with the shape of the flange short pipe 31, and both are Z-shaped; an orifice 32 is also provided at the exit position of the flange short pipe 31, and the On the orifice plate 32, small holes are arranged at the positions corresponding to the outlet of the shunt pipe 30 and the gap between the adjacent shunt pipes 30. The outlet cross-sectional area and the gap between adjacent shunt tubes 30.

The lower end of the valve stem 4 passes through the center of the valve cover 6 and goes deep into the middle cavity of the valve body 1. The lower end of the valve stem 4 is provided with a valve core 7 that can cooperate with the valve seat. The valve core 7 is integrally formed with the valve stem 4. The on-off between the inlet and the outlet of the shunt pipe 30 and the short flange pipe 31 can be controlled. Specifically, the flange short pipe 31 and the shunt pipe 30 in the flange short pipe 31 are provided with a cutout 310 at the bottom of the valve core 7 that can accommodate the insertion of the valve core 7, and the valve stem 4 controls the valve core 7 to go deep into The cutout 310 can separate the outlet end of the short flange pipe 31 and the shunt pipe 30 from the inlet end, preventing fluid from flowing into the outlet from the inlet.

Claims (3)

1. A water spray control valve, comprising a valve body, a valve stem and a valve core, characterized in that: the lower end of the valve stem goes deep into the middle cavity of the valve body, a valve seat is installed at the bottom of the valve body middle cavity, and the lower end of the valve stem There is a valve core that can cooperate with the valve seat to realize the on-off of the fluid channel in the valve body; the valve seat is provided with a steady flow assembly and a flow equalization cover in sequence from top to bottom; the flow equalization cover is a hollow cylinder, and the flow equalization There are several square flow equalizing holes evenly distributed in the circumferential direction of the lower part of the cover; the steady flow assembly includes several shunt pipes and short flange pipes; the inlet and outlet of the short flange pipes are respectively connected with the inlet and outlet of the valve body, and several shunt pipes The pipes are all arranged in the flange short pipe, and the outlet of each shunt pipe is connected with the square flow equalization hole of the flow equalization cover; a position that can accommodate the valve core is provided at the position where the flange short pipe and the shunt pipe are located below the valve core. The slit, the spool is fixedly connected with the valve stem, so that the spool can be controlled by the valve stem to go deep into the slit to block the connection between the flange short pipe and the outlet of the shunt pipe and the inlet. 2. A water spray regulating valve as claimed in claim 1, characterized in that: an orifice plate is also provided at the end of the short flange pipe and the outlet of the shunt pipe, and a number of small holes are arranged on the orifice plate, and a number of small holes are arranged on the orifice plate. The holes communicate with the outlet of each shunt pipe and the space between adjacent shunt pipes, and the cross-sectional area of each small hole is smaller than the cross-sectional area of the outlet of the shunt pipe and the space between adjacent shunt pipes. 3. A water spray regulating valve as claimed in claim 1, characterized in that: the short flange pipe and the shunt pipe are arranged in a Z shape, the inlet position of the short flange pipe and the shunt pipe is higher than the outlet position, and One end of the short flange pipe and the outlet of the shunt pipe is provided with a cutout for accommodating the valve core.