CN209943528U

CN209943528U - Minimum flow control valve

Info

Publication number: CN209943528U
Application number: CN201920736997.5U
Authority: CN
Inventors: 王骥; 曹立姿; 商德建; 朱双
Original assignee: GUAN WOKE LIQUID CONTROL CO Ltd
Current assignee: GUAN WOKE LIQUID CONTROL CO Ltd
Priority date: 2019-05-22
Filing date: 2019-05-22
Publication date: 2020-01-14
Anticipated expiration: 2029-05-22

Abstract

The application provides a minimum flow regulating valve, which comprises a valve body and a valve cover fixedly arranged on the upper part of the valve body; the valve body comprises a body, a water inlet and a water outlet which are arranged on two sides of the body, a valve seat arranged in the body, an annular throttling piece arranged on the valve seat, a valve core which is arranged in the annular throttling piece and matched with the annular throttling piece, and a valve rod arranged on the upper part of the valve core. The first pressure reduction device, the second pressure reduction device and the annular throttling element are arranged, multi-level step-by-step pressure reduction is adopted, the pressure reduction effect is greatly improved, and the service life is greatly prolonged; fluid is adopted for opposite pressure reduction in the pressure reduction processes of the first pressure reduction device and the second pressure reduction device, so that the influence of gasification erosion is greatly reduced; be equipped with sealing washer one on the disk seat, the case lower extreme is equipped with and seals washer two with sealing washer one matched with, has improved the sealed effect of valve body greatly, and the diameter of radial intercommunication groove from the bottom up increases in proper order down for a plurality of choker rings of annular throttling element simultaneously, has improved the regulation precision of case greatly.

Description

Minimum flow control valve

Technical Field

The application relates to the technical field of regulating valves, in particular to a minimum flow regulating valve.

Background

The minimum flow regulating valve is also called a boiler feed pump recirculation valve, is arranged at the outlet of the feed pump and is connected to a deaerator, and the boiler feed pump sucks water out of the deaerator and sends the water to the boiler. In order to prevent overheating and cavitation of the feed pump, the flow rate of the feed pump must in any case not be less than a certain defined safety flow rate, i.e. a minimum flow rate, which is controlled by a minimum flow rate regulating valve. Since the pressure at which the feed pump operates normally is determined by whether it is supplying water to the outside, the pressure of the feed pump fluctuates greatly and the differential pressure is as high as over 300 kilograms, which requires that the minimum flow valve of the boiler feed pump must have the capability of avoiding flash evaporation and cavitation, and since the valve is closed for more than 90% of the time, it is very difficult to close the valve under the pressure difference of over 300 kilograms and ensure that zero leakage is achieved for a long time. The minimum flow regulating valve of the existing boiler has various flow control forms, some of the minimum flow regulating valves adopt circulation hedging, some of the minimum flow regulating valves adopt multi-stage valve core throttling, and some of the minimum flow regulating valves adopt labyrinth laminated regulation, but all of the minimum flow regulating valves have the advantages and the disadvantages no matter in any mode, all of the minimum flow regulating valves have certain throttling effect, and the minimum flow regulating valves also have the problems of incomplete pressure drop effect, serious cavitation, large noise volume, violent vibration, large leakage flow, short service life and the like.

Disclosure of Invention

The present application is provided to solve the above-mentioned technical problems.

The technical scheme adopted by the application is as follows: a minimum flow regulating valve is characterized by comprising a valve body and a valve cover fixedly arranged on the upper part of the valve body; the valve body comprises a body, a water inlet and a water outlet which are arranged at two sides of the body, a valve seat arranged in the body, an annular throttling piece arranged on the valve seat, a valve core arranged in the annular throttling piece and matched with the annular throttling piece, and a valve rod arranged at the upper part of the valve core;

the annular throttling element comprises a plurality of overlapped throttling rings, each throttling ring comprises an annular disc body, a plurality of concentric annular grooves arranged on the annular disc body and a plurality of radial communicating grooves communicated with adjacent annular grooves, the cross sections of the annular grooves are sequentially increased from inside to outside, the radial communicating grooves close to the outer side and the inner side on the same annular groove are arranged in a staggered mode, and the diameters of the radial communicating grooves from bottom to top of the plurality of throttling rings overlapped into the annular throttling element are sequentially increased.

Furthermore, a first pressure reduction device connected with the water inlet is arranged below the valve seat, the first pressure reduction device comprises a first barrel and a plurality of Z-shaped runners which are symmetrically arranged on the first barrel, the Z-shaped runners comprise a first runner which is horizontally arranged, a second runner which is horizontally arranged below the first runner and a third runner which is connected with the first runner and the second runner, and the third runner is vertically arranged.

Furthermore, a second pressure reduction device is arranged at the opening at the lower end of the valve seat and comprises a second barrel body, a plurality of vertical runners arranged on the sealing surface of the lower end of the second barrel body and a plurality of symmetrically arranged horizontal runners arranged on the circumferential wall of the second barrel body.

Further, the first horizontal flow channel is horn-shaped, the vertical flow channel is a bent flow channel, the vertical flow channel comprises a first vertical flow channel, a second vertical flow channel and an inclined flow channel which connects the first vertical flow channel and the second vertical flow channel, the second vertical flow channel is arranged above the first vertical flow channel, and the diameter of the second vertical flow channel is larger than that of the first vertical flow channel.

Furthermore, the opening of the upper end face of the valve seat is in an inverted cone shape and is provided with a first sealing ring, the lower end of the valve core is provided with a second sealing ring matched with the first sealing ring, the first sealing ring is provided with a plurality of annular grooves, the cross section of each annular groove is in an inverted cone shape, and the second sealing ring is provided with a plurality of snap rings matched with the annular grooves.

The application has the advantages and positive effects that: the minimum flow regulating valve is provided with the first pressure reducing device, the second pressure reducing device and the annular throttling element, and multi-level step-by-step pressure reduction is adopted, so that the pressure reducing effect is greatly improved, the service life is greatly prolonged, and the problem of high noise is solved; fluid is adopted for opposite-flushing pressure reduction in the pressure reduction processes of the first pressure reduction device and the second pressure reduction device, so that the influence of gasification erosion is greatly reduced, and the service life of the regulating valve is further prolonged; this application is equipped with sealing washer one at disk seat up end opening part, is equipped with a plurality of back taper annular grooves on the sealing washer one, and the case lower extreme is equipped with sealing washer one matched with sealing washer two, has improved the sealed effect of valve body greatly, and the diameter in the radial intercommunication groove that makes progress from down of a plurality of chokers of annular throttling element increases in proper order simultaneously, has improved the regulation precision of case greatly.

In addition to the technical problems addressed by the present application, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems solved by the present application, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a minimum flow regulating valve provided in an embodiment of the present application;

FIG. 2 is a schematic view of a throttle ring structure provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a first voltage reduction device provided in an embodiment of the present application;

fig. 4 is a schematic structural diagram of a second voltage reduction device provided in the embodiment of the present application;

FIG. 5 is a schematic diagram of a vertical flow channel and a horizontal flow channel structure provided by an embodiment of the present application;

fig. 6 is a schematic structural diagram of a first seal ring and a second seal ring provided in an embodiment of the present application.

In the figure: 1, a valve body; 110 a body; a water inlet 120; 130 water outlet; 140 a valve seat; 150 annular flow restriction member; 160 a valve core; 170 a valve stem; 2, a valve cover; 3, a throttling ring; 310 an annular disk body; 320 annular grooves; 330 radial communicating grooves; 4 a first voltage reduction device; 410, a first cylinder body; 420Z-shaped flow passages; 421 a first flow passage; 422 a second flow passage; 423 a third flow path; 5 a second voltage reduction device; 510, a second cylinder body; 520 a vertical runner; 521 a first vertical flow channel; 522 a second vertical flow passage; 523 inclined flow channel; 530 a horizontal flow passage; 6, sealing a first seal ring; 610 an annular groove; 7, a second sealing ring; 710 snap ring

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 and 2, a minimum flow regulating valve is characterized by comprising a valve body 1 and a valve cover 2 fixedly arranged at the upper part of the valve body 1; the valve body 1 comprises a body 110, a water inlet 120 and a water outlet 130 which are arranged at two sides of the body 110, a valve seat 140 arranged in the body 110, an annular throttling element 150 arranged on the valve seat 140, a valve core 160 arranged in the annular throttling element 150 and matched with the annular throttling element 150, and a valve rod 170 arranged at the upper part of the valve core 160;

the annular throttling element 150 comprises a plurality of overlapped throttling rings 3, each throttling ring 3 comprises an annular disc body 310, a plurality of concentric annular grooves 320 arranged on the annular disc body 310 and a plurality of radial communicating grooves 330 communicated with the adjacent annular grooves 320, the cross sections of the annular grooves 320 are sequentially increased from inside to outside, the radial communicating grooves 330 close to the outer side and the inner side on the same annular groove 320 are arranged in a staggered mode, and the diameters of the radial communicating grooves 330 from bottom to top of the plurality of throttling rings 3 overlapped on the annular throttling element 150 are sequentially increased.

In this embodiment, a water inlet 120 and a water outlet 130 are disposed on two sides of a body 110 of a valve body 1, the water inlet 120 is located below the water outlet 130, a valve seat 140 is disposed on the body 110 between the water inlet 120 and the water outlet 130, an annular throttling member 150 is disposed on an upper portion of the valve seat 140, a valve core 160 is disposed in the annular throttling member 150 and is matched with the annular throttling member 150, a valve rod 170 is disposed on an upper portion of the valve core 160, and the valve core 160 can move up and down under the driving of the valve rod 170; in this embodiment, the annular throttling element 150 is formed by sequentially overlapping a plurality of throttling rings 3 up and down, a plurality of concentric annular grooves 320 are arranged on the annular disc body 310 of the throttling rings 3, adjacent annular grooves 320 are communicated with each other through a plurality of radial communicating grooves 330, and the radial communicating grooves 330 near the outer side and the inner side on the same annular groove 320 are arranged in a staggered manner, when in work, water flows into the outer ring from the inner ring through the radial communicating grooves 330, in the flowing process, the water flowing into the annular groove 320 through the inner radial communicating groove 330 in the same annular groove 320 is divided into two parts which flow back to the annular groove 320, when the water flows through the outer radial communicating groove 330, the two water flows flowing in opposite directions are converged, and the molecules flowing at high speed generate impact, friction and vortex, thereby consuming a large amount of energy, reducing the pressure, when water flows from the inner annular groove 320 to the outer annular groove 320, the volume of the annular groove 320 is gradually increased, so that the flow rate and the water pressure of the water flow are further reduced; in this embodiment, the cross-sectional size of the annular groove 320 is sequentially increased from inside to outside, so as to further reduce the flow rate and water pressure of water flow; in this embodiment, the diameters of the radial communicating grooves 330 from bottom to top of the plurality of throttle rings 3 overlapped to form the annular throttle member 150 are sequentially increased, and the valve core 160 is matched with the annular throttle member 150, thereby greatly improving the adjusting accuracy of the valve body 1.

As shown in fig. 3, in a preferred embodiment, a first pressure reducing device 4 connected to the water inlet 120 is disposed below the valve seat 140, the first pressure reducing device 4 includes a first cylinder 410 and a plurality of symmetrically disposed Z-shaped flow channels 420 disposed on the first cylinder 410, the Z-shaped flow channels 420 include a first flow channel 421 disposed horizontally, a second flow channel 422 disposed horizontally below the first flow channel 421, and a third flow channel 423 connecting the first flow channel 421 and the second flow channel 422, and the third flow channel 423 is disposed vertically.

In this embodiment, the first pressure reducing device 4 is a cylindrical structure, a plurality of symmetrical Z-shaped flow channels 420 are arranged on the circumferential wall of the cylindrical body one 410, a first flow channel 421 horizontally arranged is arranged at the upper part of the Z-shaped flow channel 420, a second flow channel 422 horizontally arranged is arranged at the lower end of the Z-shaped flow channel 420, the first flow channel 421 and the second flow channel 422 are communicated through a third flow channel 423 vertically arranged, wherein the first flow channel 421 is located at the outer side of the cylinder body one 410, the second flow channel 422 is located at the inner side of the cylinder body one 410, when in operation, fluid enters through the first flow channel 421, at the inlet and outlet of the third flow channel 423, the fluid is forced to rebound, the rebounded fluid and the entering fluid generate in-flow collision, thereby reducing the flow rate and pressure of the fluid entering the second flow passage 422, the fluid entering the first cylinder 410 through the second flow passage 422, and is flushed again with the fluid flowing out of the symmetrical Z-shaped flow channel 420, further reducing the flow rate and pressure of the fluid.

As shown in fig. 4, in a preferred embodiment, a second pressure reducing device 5 is disposed at the lower end opening of the valve seat 140, and the second pressure reducing device 5 includes a second cylinder 510, a plurality of vertical flow channels 520 disposed on the lower end sealing surface of the second cylinder 510, and a plurality of symmetrically disposed horizontal flow channels 530 disposed on the circumferential wall of the second cylinder 510.

In this embodiment, the second cylinder 510 is disposed at the lower opening of the valve seat 140, a horizontal flow channel 530 is disposed on the circumferential wall of the second cylinder 510, a vertical flow channel 520 is disposed on the cover of the lower end section of the second cylinder 510, a part of the fluid passing through the first pressure reducing device 4 enters the inner cavity of the second cylinder 510 through the horizontal flow channel 530, a part of the fluid enters the inner cavity of the second cylinder 510 through the vertical flow channel 520, and the fluid passing through the symmetrical horizontal flow channel 530 performs pressure hedging in the horizontal direction and in the vertical direction with the fluid passing through the vertical flow channel 520, so that the pressure of the fluid is greatly reduced, meanwhile, erosion of the fluid relief valve element 160 is avoided, and the service life.

As shown in fig. 5, in a preferred embodiment, the horizontal flow channel 530 is a trumpet-shaped flow channel, the vertical flow channel 520 is a bent flow channel, the vertical flow channel 520 includes a first vertical flow channel 521, a second vertical flow channel 522 and an inclined flow channel 523 connecting the first vertical flow channel 521 and the second vertical flow channel 522, the second vertical flow channel 522 is disposed above the first vertical flow channel 521, and the diameter of the second vertical flow channel 522 is greater than that of the first vertical flow channel 521.

In this embodiment, the horizontal flow channel 530 is in a horn shape, and when the fluid passes through the horizontal flow channel 530, the flow velocity is reduced because the cross section of the flow channel is gradually increased, thereby facilitating the subsequent fluid hedging pressure reduction; in this embodiment, the vertical flow channel 520 is provided with a first vertical flow channel 521, a second vertical flow channel 522 and an inclined flow channel 523 connecting the first vertical flow channel 521 and the second vertical flow channel 522, fluid enters through the first vertical flow channel 521, and is reflected at the inclined flow channel 523 to collide with the entering fluid, so that the flow rate and pressure of the fluid in the vertical flow channel 520 are reduced, meanwhile, the diameter of the second vertical flow channel 522 is larger than that of the first vertical flow channel 521, and the flow rate and pressure of the fluid passing through the vertical flow channel 520 are further reduced due to the increase of the cross section of the flow channel.

As shown in fig. 6, in a preferred embodiment, an opening of an upper end surface of the valve seat 140 is reverse-tapered and is provided with a first sealing ring 6, a second sealing ring 7 which is matched with the first sealing ring 6 is arranged at a lower end of the valve core 160, a plurality of annular grooves 610 are arranged on the first sealing ring 6, the cross section of each annular groove 610 is reverse-tapered, and a plurality of snap rings 710 which are matched with the annular grooves 610 are arranged on the second sealing ring 7.

In this embodiment, the first sealing ring 6 is provided with a plurality of annular grooves 610 having inverted conical cross sections, and the second sealing ring 7 is provided with snap rings 710 matching with the annular grooves 610, so that the sealing effect between the valve core 160 and the valve seat 140 is greatly improved.

The embodiments of the present application have been described in detail, but the description is only for the preferred embodiments of the present application and should not be construed as limiting the scope of the application. All equivalent changes and modifications made within the scope of the present application shall fall within the scope of the present application.

Claims

1. The minimum flow regulating valve is characterized by comprising a valve body (1) and a valve cover (2) fixedly arranged on the upper part of the valve body (1); the valve body (1) comprises a body (110), a water inlet (120) and a water outlet (130) which are arranged at two sides of the body (110), a valve seat (140) arranged in the body (110), an annular throttling piece (150) arranged on the valve seat (140), a valve core (160) which is arranged in the annular throttling piece (150) and matched with the annular throttling piece (150), and a valve rod (170) arranged at the upper part of the valve core (160);

the annular throttling element (150) comprises a plurality of overlapped throttling rings (3), each throttling ring (3) comprises an annular disc body (310), a plurality of concentric annular grooves (320) arranged on the annular disc body (310) and a plurality of radial communicating grooves (330) communicated with the adjacent annular grooves (320), the cross section sizes of the annular grooves (320) are sequentially increased from inside to outside, the same radial communicating grooves (330) close to the outer side and the inner side on the annular grooves (320) are arranged in a staggered mode, and the diameters of the radial communicating grooves (330) from bottom to top of the plurality of throttling rings (3) overlapped into the annular throttling element (150) are sequentially increased.

2. The minimum flow regulating valve according to claim 1, wherein a first pressure reducing device (4) connected with the water inlet (120) is arranged below the valve seat (140), the first pressure reducing device (4) comprises a first cylinder body (410) and a plurality of symmetrically arranged Z-shaped flow channels (420) arranged on the first cylinder body (410), the Z-shaped flow channels (420) comprise a first flow channel (421) horizontally arranged, a second flow channel (422) horizontally arranged below the first flow channel (421) and a third flow channel (423) connecting the first flow channel (421) with the second flow channel (422), and the third flow channel (423) is vertically arranged.

3. The minimum flow regulating valve according to claim 2, wherein a second pressure reducing device (5) is arranged at the lower end opening of the valve seat (140), and the second pressure reducing device (5) comprises a second cylinder (510), a plurality of vertical flow passages (520) arranged on the lower end sealing surface of the second cylinder (510), and a plurality of symmetrically arranged horizontal flow passages (530) arranged on the circumferential wall of the second cylinder (510).

4. The minimum flow control valve according to claim 3, wherein the first horizontal flow passage (530) is horn-shaped, the vertical flow passage (520) is a bent flow passage, the vertical flow passage (520) includes a first vertical flow passage (521), a second vertical flow passage (522), and an inclined flow passage (523) connecting the first vertical flow passage (521) and the second vertical flow passage (522), the second vertical flow passage (522) is disposed above the first vertical flow passage (521), and a diameter of the second vertical flow passage (522) is greater than a diameter of the first vertical flow passage (521).

5. The minimum flow control valve according to claim 4, wherein the opening of the upper end face of the valve seat (140) is reverse-tapered and is provided with a first sealing ring (6), the lower end of the valve core (160) is provided with a second sealing ring (7) matched with the first sealing ring (6), the first sealing ring (6) is provided with a plurality of annular grooves (610), the cross section of each annular groove (610) is reverse-tapered, and the second sealing ring (7) is provided with a plurality of snap rings (710) matched with the annular grooves (610).