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CN-224214734-U - Double-loop steam-water regulating valve

CN224214734UCN 224214734 UCN224214734 UCN 224214734UCN-224214734-U

Abstract

The utility model discloses a double-loop steam-water regulating valve, belongs to the technical field of power station regulating valves, and aims to solve the problem that an existing steam-water separator inlet regulating valve is only suitable for one medium. The valve comprises a valve body, wherein a rectifying sleeve and a valve seat sleeve are arranged in the valve body up and down, a plurality of first throttling hole groups are arranged on the rectifying sleeve, a third throttling hole group and a plurality of fourth throttling holes are arranged on the valve seat sleeve, the upper peripheral part of a large valve plug is in sliding fit with the rectifying sleeve, and the lower peripheral part of the large valve plug is in sliding fit with the inner periphery of the valve seat sleeve. The lower part of big valve plug is equipped with a plurality of second orifice groups, and lower valve plug and big valve plug's hole sliding fit form the main valve port between big valve plug's periphery and the disk seat cover, form the auxiliary valve port between the periphery of little valve plug and the inner periphery of big valve plug, form the major loop when the main valve port is opened, form the auxiliary loop when the main valve port is closed the auxiliary valve port and is opened, can guarantee to have good regulation characteristic under the medium is the multiple state of supercooling water, saturated water, vapour-liquid two-phase, saturated steam and superheated steam.

Inventors

  • ZHANG CHI
  • ZHANG YONGBIAO
  • HAO XIANGJUN
  • LIU YANG

Assignees

  • 哈尔滨滨大阀门制造有限公司

Dates

Publication Date
20260508
Application Date
20250609

Claims (10)

  1. 1. The double-loop steam-water regulating valve is characterized by comprising a valve body (1), wherein the valve body (1) is a three-way member provided with a medium inlet (21), a medium outlet (22) and a stop control port (19), a valve cover (9) seals the stop control port (19), a partition rib is arranged in the valve body (1), an inner cavity of the valve body (1) is divided into an upper valve cavity (20) and a lower valve cavity (24) by the partition rib, the medium outlet (22) is communicated with the lower valve cavity (24), the medium inlet (21) and the stop control port (19) are respectively communicated with the upper valve cavity (20), a through-diameter hole (23) is formed in the partition rib, a valve seat sleeve (2) is a cup-shaped member, the valve seat sleeve (2) penetrates through the through-diameter hole (23), the valve seat sleeve (2) is in sealing fit with the partition rib, a first sealing conical surface (27) is arranged in an inner part Zhou Dingduan of the valve seat sleeve (2), a plurality of third orifice groups (25) are axially formed in the lower side wall of the valve seat sleeve (2), and a plurality of fourth orifices (26) are formed in the bottom wall of the valve seat sleeve (2); The rectifying sleeve (7) is a cylindrical member, the lower end of the rectifying sleeve (7) is matched with the top end spigot of the valve seat sleeve (2), the valve cover (9) seals the upper opening of the rectifying sleeve (7), a plurality of first orifice groups (29) are axially arranged at the bottom of the rectifying sleeve (7), a first through orifice group (28) is arranged in the middle of the rectifying sleeve (7), and the first orifice groups (29) and the first through orifice groups (28) are all positioned in the upper valve cavity (20); The large valve plug (3) is a cylindrical member with an upper seal, the outer circumferential surface of the large valve plug (3) comprises a first large-diameter circumferential surface (36) positioned at the upper part and a first small-diameter circumferential surface (38) positioned at the lower part, the first large-diameter circumferential surface (36) and the first small-diameter circumferential surface (38) are connected through a second sealing conical surface (37), the first large-diameter circumferential surface (36) is in sliding fit with the inner circumference of the rectifying sleeve (7), the first small-diameter circumferential surface (38) is in sliding fit with the inner circumference of the valve seat sleeve (2), the second sealing conical surface (37) is abutted to or separated from the first sealing conical surface (27), a plurality of second orifice groups (43) are axially arranged on the side wall where the first small-diameter circumferential surface (38) is positioned, an annular step (49) is arranged on the inner circumference where the first large-diameter circumferential surface (36) is positioned, a third sealing conical surface (34) is arranged at the upper end of an inner hole of the annular step (49), a small valve cavity (41) is formed between the annular step (49) and the top wall of the large valve plug (3), a second through hole group (40) is arranged on the side wall of the small valve cavity (41), the second through hole group (37) is abutted to the first sealing conical surface (27) and a plurality of second through holes (40) are abutted to the first through hole groups (29) and the second through hole groups (29), the second orifice groups (43) are staggered or partially overlapped with the third orifice groups (25); the inner hole of the annular step (49) is provided with a plurality of groups of valve plug guide groove groups (42) along the axial interval, the inner circumference of the annular step (49) forms an inner circumference annular sealing band (48) at the lower end of each group of valve plug guide groove groups (42), the lower end of the valve rod (4) is provided with a small valve plug (44), the outer circumference of the small valve plug (44) comprises a second large diameter circumferential surface (50) positioned at the upper part and a second small diameter circumferential surface (51) positioned at the lower part, the second large diameter circumferential surface (50) and the second small diameter circumferential surface (51) are connected through a fourth sealing conical surface (45), the distance from the third sealing conical surface (34) to the top wall of the large valve plug (3) is larger than the distance from the fourth sealing conical surface (45) to the top end of the small valve plug (44), a plurality of groups of valve rod throttling groove groups (46) are arranged on the small valve plug (44) along the axial interval, the outer circumference of the small valve plug (44) is connected with the fourth sealing conical surface (45) in a way, the distance from the third sealing conical surface (34) to the top end of each group of valve plug guide groove groups (46) is equal to the third sealing conical surface (46), when the fourth sealing conical surface (45) is separated from the third sealing conical surface (34), the inner peripheral annular sealing strips (48) and the outer peripheral annular sealing strips (47) are staggered, and the valve rod throttling groove groups (46) and the valve plug diversion groove groups (42) are sequentially staggered and communicated to form a plurality of depressurization pore channels; the upper end of the valve rod (4) sequentially passes through the top wall of the big valve plug (3) and the valve cover (9) and is connected with the actuator (14).
  2. 2. The double-loop steam-water regulating valve according to claim 1, wherein the large valve plug (3) comprises an upper sleeve (30), a plurality of middle sleeves (31) and a lower sleeve (32) which are sequentially connected in a threaded manner from top to bottom, a plurality of second orifice groups (43) are arranged on the lower sleeve (32), a group of valve plug guide groove groups (42) are arranged on each layer of middle sleeve (31), the valve plug guide groove groups (42) are composed of a plurality of first trapezoid grooves which are uniformly distributed in the circumference, the first trapezoid grooves are composed of a plurality of guide straight sections and contraction sections which are uniformly distributed in the circumference, the valve rod throttle groove groups (46) are composed of a plurality of second trapezoid grooves which are uniformly distributed in the circumference, the second trapezoid grooves are composed of expansion sections, equal straight sections and contraction sections which are sequentially connected from top to bottom, and the small valve cavities (41) are arranged in the upper sleeve (30), and working gaps are arranged between the side walls of the small valve cavities (41) and the second large-diameter peripheral surfaces (50).
  3. 3. The double-loop steam-water regulating valve according to claim 2, wherein a process hole (39) is formed in the top end of the upper sleeve (30), the diameter of the process hole (39) is larger than that of the second large-diameter peripheral surface (50), and the plugging plate (33) is in threaded connection with the upper sleeve (30) and fills the process hole (39).
  4. 4. A double-loop steam-water regulating valve according to claim 3, wherein the blocking plate (33) is provided with an air pressure balance hole (35) which is through up and down.
  5. 5. A double-loop steam-water regulating valve according to claim 1, characterized in that the valve rod (4) is connected with the output end of an actuator (14) through a guide coupler (13), the actuator (14) is supported on the valve cover (9) through a support column (15), and the guide coupler (13) is in sliding fit with the support column (15).
  6. 6. The double-loop steam-water regulating valve according to claim 1, wherein the valve cover (9) is connected with the valve body (1) through a fastening bolt (10) and a fastening nut (11).
  7. 7. The double-loop steam-water regulating valve according to claim 1, wherein a disc spring set (5) is sleeved on the valve rod (4), the valve rod (4) is in threaded connection with the limit nut (6), and two ends of the disc spring set (5) are respectively abutted against the plugging plate (33) and the limit nut (6).
  8. 8. A double circuit steam and water regulating valve according to claim 7, wherein the limit nut (6) is fixed with the valve rod (4) by pin joint.
  9. 9. The double-loop steam-water regulating valve according to claim 1, wherein a sealing sinking groove is formed in the lower end face of the valve cover (9), the valve rod (4) penetrates through the valve cover (9) from the sealing sinking groove, a sealing sleeve (18) is arranged in the sealing sinking groove, the baffle ring (8) is connected with the valve cover (9) in a threaded mode, the baffle ring (8) presses the sealing sleeve (18) on the bottom face of the sealing sinking groove, and the valve cover (9) and the valve rod (4) are sealed in a sliding mode through the sealing sleeve (18).
  10. 10. A double-loop steam-water regulating valve according to any one of claims 1-9, wherein a stuffing box is machined on the upper end face of a valve cover (9), a valve rod (4) penetrates through the valve cover (9) from the stuffing box, a stuffing assembly (12) is arranged in the stuffing box, a stuffing gland (16) is connected with the valve cover (9), the stuffing assembly (12) is pressed on the bottom face of the stuffing box by the stuffing gland (16) through a pressing sleeve (17), and the valve cover (9) and the valve rod (4) are sealed in a sliding mode through the stuffing assembly (12).

Description

Double-loop steam-water regulating valve Technical Field The utility model belongs to the technical field of power station regulating valves, and particularly relates to a double-loop steam-water regulating valve. Background The inlet regulating valve of the steam-water separator is one of important equipment in a steam power generation system, and the main function of the inlet regulating valve is to regulate the steam flow entering the steam-water separator, so that the working state of the steam-water separator is accurately controlled. In the start-stop process of the unit, the medium undergoes a phase change process from water to steam, and various states including supercooled water, saturated water, vapor-liquid two-phase, saturated steam and superheated steam can be possibly displayed when entering the vapor-water separator, so that the vapor-water separator inlet regulating valve is required to adapt to the flow characteristics of various working mediums and has reliable regulating capability. Various regulating valves existing in the market are generally only suitable for one state of one medium, and under the complex conditions that the medium has multiple states and multiple working conditions, the regulating characteristics and the running stability are all deficient, so that the requirements of a system are difficult to meet. Disclosure of utility model The utility model aims to provide a double-loop steam-water regulating valve, which is used for solving the problem that the inlet regulating valve of the existing steam-water separator is only suitable for one medium. The technical scheme adopted by the utility model is as follows: the double-loop steam-water regulating valve comprises a valve body, wherein the valve body is a three-way member provided with a medium inlet, a medium outlet and a stop control port, a valve cover seals the stop control port, a separation rib is arranged in the valve body, the separation rib divides an inner cavity of the valve body into an upper valve cavity and a lower valve cavity, the medium outlet is communicated with the lower valve cavity, the medium inlet and the stop control port are respectively communicated with the upper valve cavity, a drift diameter hole is formed in the separation rib, a valve seat sleeve is a cup-shaped member, the valve seat sleeve penetrates through the drift diameter hole, the valve seat sleeve is in sealing fit with the separation rib, a first sealing conical surface is arranged in an inner Zhou Dingduan of the valve seat sleeve, a plurality of third orifice groups are formed in the lower part of the side wall of the valve seat sleeve along the axial direction, and a plurality of fourth orifices are formed in the bottom wall of the valve seat sleeve; The flow straightening sleeve is a cylindrical member, the lower end of the flow straightening sleeve is matched with the top end spigot of the valve seat sleeve, the valve cover seals the upper opening of the flow straightening sleeve, the bottom of the flow straightening sleeve is axially provided with a plurality of first orifice groups, the middle part of the flow straightening sleeve is provided with a first through orifice group, and the first orifice groups and the first through orifice groups are all positioned in the upper valve cavity; The large valve plug is a cylindrical member with an upper seal, the outer circumferential surface of the large valve plug comprises a first large-diameter circumferential surface positioned at the upper part and a first small-diameter circumferential surface positioned at the lower part, the first large-diameter circumferential surface and the first small-diameter circumferential surface are connected through a second sealing conical surface, the first large-diameter circumferential surface is in sliding fit with the inner circumference of the rectifying sleeve, the first small-diameter circumferential surface is in sliding fit with the inner circumference of the valve seat sleeve, the second sealing conical surface is in abutting sealing or separating with the first sealing conical surface, a plurality of second orifice groups are axially arranged on the side wall of the first small-diameter circumferential surface, an annular step is arranged at the inner circumference of the position of the first large-diameter circumferential surface, a third sealing conical surface is arranged at the upper end of an inner hole of the annular step, a small valve cavity is formed between the annular step and the top wall of the large valve plug, a second through hole group is arranged on the side wall of the small valve cavity, when the second sealing conical surface abuts sealing with the first sealing conical surface, the first through hole group is aligned and the second through hole group are in sealing, the first large-diameter circumferential surface seals the plurality of first hole groups, and a plurality of third hole groups are partially overla