CN217842758U

CN217842758U - Composite regulating valve

Info

Publication number: CN217842758U
Application number: CN202222306244.5U
Authority: CN
Inventors: 张永标; 袁爱文; 郝相军
Original assignee: Harbin Bin Da Valve Manufacture Co ltd
Current assignee: Harbin Bin Da Valve Manufacture Co ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2022-11-18
Anticipated expiration: 2032-08-31

Abstract

A compound regulating valve belongs to the technical field of valves, realizes a large regulating range of the valve, and can effectively avoid cavitation, and comprises a valve body, a valve cage arranged in the valve body, and an inner cylinder matched with the valve cage to form a sealing pair, wherein the valve cage and the inner cylinder form a cage sleeve regulating valve core; a multi-stage regulating valve plug is arranged in the inner cylinder, a multi-stage valve seat matched with the multi-stage regulating valve plug is arranged on the inner wall of the inner cylinder, the inner cylinder and the multi-stage regulating valve plug form a multi-stage vortex pressure reduction regulating valve core, and a channel leading to the multi-stage vortex pressure reduction regulating valve core is arranged on the valve cage and the inner cylinder; the multistage regulating valve plug is connected with the valve rod, an outer sleeve ring is arranged on the valve rod, an inner sleeve ring is arranged on the inner barrel, a disc spring is arranged between the outer sleeve ring and the inner sleeve ring, and when the multistage vortex pressure reduction regulating valve core is in a closed state, the disc spring is in a compressed state; the inner lantern ring also limits the multi-stage regulating valve plug; the utility model is used for adjust flow and pressure.

Description

Composite regulating valve

Technical Field

The utility model belongs to the technical field of the valve, concretely relates to compound governing valve.

Background

The high-temperature high-pressure steam is widely applied in industrial production, the flow and the pressure need to be adjusted by using an adjusting valve in the process of generating steam in a once-through boiler, the conventional adjusting valve comprises a cage-type sleeve adjusting valve and a multi-stage vortex pressure reducing adjusting valve, the cage-type sleeve adjusting valve has poor cavitation resistance and short service life, the multi-stage vortex pressure reducing adjusting valve effectively solves the problem of cavitation, but has small adjusting range on the flow and the pressure, and therefore improvement is needed, one valve not only has a large adjusting range, but also can effectively avoid cavitation.

Disclosure of Invention

The utility model aims at solving the above-mentioned problem that current governing valve exists, provide a compound governing valve, its technical scheme as follows:

a composite regulating valve comprises a valve body, a valve cage arranged in the valve body and an inner cylinder matched with the valve cage to form a sealing pair, wherein the valve cage and the inner cylinder form a cage sleeve regulating valve core; a multi-stage regulating valve plug is arranged in the inner cylinder, a multi-stage valve seat matched with the multi-stage regulating valve plug is arranged on the inner wall of the inner cylinder, the inner cylinder and the multi-stage regulating valve plug form a multi-stage vortex pressure reduction regulating valve core, a channel leading to the multi-stage vortex pressure reduction regulating valve core is arranged on the valve cage and the inner cylinder, and holes are formed at the corresponding positions; the above is easy to realize according to the prior art, and the difficulty lies in how to control the ordered switching of the two valve cores; the multi-stage regulating valve plug is connected with the valve rod, one end of the valve rod extends to the outer side of the valve body, and the executing mechanism can control the lifting of the multi-stage regulating valve core through the valve rod; an outer sleeve ring is arranged on the valve rod and fixedly connected with the valve rod, an inner sleeve ring is arranged on the inner cylinder and fixedly connected with the inner cylinder, a disc spring is arranged between the outer sleeve ring and the inner sleeve ring, when a multi-stage vortex pressure reduction adjusting valve core formed by the inner cylinder and the multi-stage adjusting valve plug is in a closed state, namely when the pressure of the valve rod is large enough, the disc spring is in a compressed state, and when the pressure of the valve rod is reduced, the outer sleeve ring and the inner sleeve ring move towards the far direction under the elastic force action of the disc spring to drive the multi-stage vortex pressure reduction adjusting valve core to be opened; the inner lantern ring also limits the multistage adjusting valve plug, the size is larger, the realization is easy, and the multistage adjusting valve plug is blocked after touching the inner lantern ring when being opened; when the valve rod continues to move upwards, the multi-stage regulating valve plug drives the inner cylinder to move upwards together, so that the cage type sleeve regulating valve core is opened; only the multistage vortex pressure reduction regulating valve core is in an opening stage, the working condition belongs to large pressure difference and small flow, and the multistage vortex pressure reduction regulating valve core can effectively avoid cavitation; in the opening stage of the cage-type sleeve adjusting valve core, the working condition belongs to small pressure difference and large flow, and cavitation phenomenon can not occur, so that a valve is wide in adjusting range, and cavitation is effectively avoided.

The beneficial effects of the utility model are that: the valve has a large adjusting range, can effectively avoid cavitation, realizes long-term operation without erosion and failure, and can meet the requirements on the performance of the valve under various working conditions. Still have structural design reasonable, simple, convenient to use's advantage. When closing the valve, valve rod downstream, because the sliding friction power between valve cage and inner tube is less, belleville spring's resistance is very big, so inner tube and multistage adjusting valve plug can be simultaneously along with the valve rod motion, and after inner tube motion to the extreme low position, multistage adjusting valve plug just can begin to close, can realize orderly switch.

Description of the drawings:

fig. 1 is a schematic view of the valve closed state of the present invention;

FIG. 2 is a schematic illustration of the valve stem and multi-step modulating valve plug configuration;

FIG. 3 is a schematic structural view of the inner barrel;

FIG. 4 is a schematic illustration of a cage construction;

FIG. 5 is an enlarged schematic view of a spool portion of FIG. 1;

fig. 6 is a schematic view of the open state and flow direction of the valve of the present invention.

The specific implementation mode is as follows:

referring to fig. 1 and 6, a composite regulating valve comprises a valve body 1, a valve cage 2 arranged in the valve body 1, and an inner cylinder 3 matched with the valve cage 2 to form a sealing pair, wherein the valve cage 2 and the inner cylinder 3 form a cage sleeve regulating valve core; a multi-stage regulating valve plug 4 is arranged in the inner cylinder 3, a multi-stage valve seat 3-1 matched with the multi-stage regulating valve plug 4 is arranged on the inner wall of the inner cylinder 3, the inner cylinder 3 and the multi-stage regulating valve plug 4 form a multi-stage vortex pressure reduction regulating valve core, a channel 3-2 leading to the multi-stage vortex pressure reduction regulating valve core is arranged on the valve cage 2 and the inner cylinder 3, and holes are formed at corresponding positions; the above is easy to realize according to the prior art, and the difficulty lies in how to control the ordered switching of the two valve cores; the multi-stage regulating valve plug 4 is connected with the valve rod 5, one end of the valve rod 5 extends to the outer side of the valve body 1, and the executing mechanism can control the lifting of the multi-stage regulating valve plug 4 through the valve rod 5; an outer sleeve ring 6 is arranged on the valve rod 5, the outer sleeve ring 6 is fixedly connected with the valve rod 5, an inner sleeve ring 7 is arranged on the inner cylinder 3, the inner sleeve ring 7 is fixedly connected with the inner cylinder 3, a disk spring 8 is arranged between the outer sleeve ring 6 and the inner sleeve ring 7, when a multistage vortex pressure reduction regulating valve core formed by the inner cylinder 3 and the multistage regulating valve plug 4 is in a closed state, namely when the pressure of the valve rod 5 is sufficiently large, the disk spring 8 is in a compressed state, and when the pressure of the valve rod 5 is reduced, the outer sleeve ring 6 and the inner sleeve ring 7 move far away under the elastic force action of the disk spring 8 to drive the multistage vortex pressure reduction regulating valve core to be opened; the inner sleeve ring 7 also limits the multi-stage regulating valve plug 4, the size is larger, the realization is easy, and the multi-stage regulating valve plug 4 is blocked after touching the inner sleeve ring 7 when being opened; when the valve rod 5 continues to move upwards, the multi-stage regulating valve plug 4 drives the inner cylinder 3 to move upwards together, and then the cage type sleeve regulating valve core is opened; only the multistage vortex pressure reduction regulating valve core is in an opening stage, the working condition belongs to large pressure difference and small flow, and the multistage vortex pressure reduction regulating valve core can effectively avoid cavitation; in the opening stage of the cage-type sleeve adjusting valve core, the working condition belongs to small pressure difference and large flow, and cavitation phenomenon can not occur, so that a valve is wide in adjusting range, and cavitation is effectively avoided.

The outer collar 6 is sleeved on the valve rod 5 and fixed through a jackscrew.

The inner lantern ring 7 is connected with the valve cage 2 through threads, an external thread is arranged on the inner lantern ring 7, and a corresponding internal thread is arranged on the valve cage 2.

Preferably, an axial key structure is arranged between the valve rod 5 and the inner lantern ring 7, so that the valve rod 5 and the inner lantern ring 7 are limited to slide only in the axial direction and cannot rotate in the circumferential direction; a key groove 7-1 is arranged on the inner lantern ring 7, one end of a key 9 is fixedly connected to the valve rod 5, and the other end of the key is inserted into the key groove 7-1.

Claims

1. A composite regulating valve comprises a valve body (1), a valve cage (2) arranged in the valve body (1) and an inner cylinder (3) which is matched with the valve cage (2) to form a sealing pair, wherein the valve cage (2) and the inner cylinder (3) form a cage type sleeve regulating valve core; the device is characterized in that a multi-stage regulating valve plug (4) is arranged in an inner cylinder (3), a multi-stage valve seat (3-1) matched with the multi-stage regulating valve plug (4) is arranged on the inner wall of the inner cylinder (3), the inner cylinder (3) and the multi-stage regulating valve plug (4) form a multi-stage vortex pressure-reducing regulating valve core, and a channel (3-2) leading to the multi-stage vortex pressure-reducing regulating valve core is arranged on a valve cage (2) and the inner cylinder (3); the multistage regulating valve plug (4) is connected with the valve rod (5), an outer sleeve ring (6) is arranged on the valve rod (5), the outer sleeve ring (6) is fixedly connected with the valve rod (5), an inner sleeve ring (7) is arranged on the inner barrel (3), the inner sleeve ring (7) is fixedly connected with the inner barrel (3), a disc spring (8) is arranged between the outer sleeve ring (6) and the inner sleeve ring (7), and when the multistage vortex pressure reduction regulating valve core formed by the inner barrel (3) and the multistage regulating valve plug (4) is in a closed state, the disc spring (8) is in a compressed state; the inner lantern ring (7) also limits the multistage adjusting valve plug (4).

2. A compound regulating valve according to claim 1, characterised in that the outer collar (6) is fitted around the valve stem (5) and is fixed by means of a jackscrew.

3. A compound regulating valve according to claim 1 or 2, characterised in that the inner collar (7) is screwed to the cage (2).

4. A compound regulating valve according to claim 1 or 2, characterised in that an axial key structure is provided between the valve stem (5) and the inner collar (7).