Adjustable nozzle type steam regulating valve

Abstract

The utility model discloses an adjustable nozzle type steam regulating valve, which particularly relates to the technical field of valves, and comprises a flow guide sleeve which is fixedly arranged on a top port of a valve cage and consists of a balance cylinder, and a cut-off valve core and a regulating valve core which are arranged on a valve rod from top to bottom, the valve rod moves in the axial direction of the flow guide sleeve so that the cut-off valve element and the adjusting valve element can move between the valve cage and the balance cylinder. Pressure equalizing holes distributed in a circumferential array are formed in the end face of the top of the stop valve element. The end face of the top of the adjusting valve element is provided with flow guide holes distributed in a circumferential array mode. Open holes are symmetrically formed in the balance cylinder, and any one of the pressure equalizing hole and the flow guide hole is communicated with the open holes. According to the utility model, the sealing surface can be prevented from being directly scoured under the working condition of small opening, and meanwhile, good adjusting performance can be kept under the condition of large opening, so that the service life of the valve is prolonged, and the sealing reliability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to a kind of adjustable nozzle type steam regulating valve. BACKGROUND

[0002] Steam regulating valve is important control element in air separation device, and its performance influences the running stability and energy consumption level of air separation system.The traditional steam regulating valve adopts single valve core structure, and valve core bears regulating and cutting function simultaneously, however, in actual use process, this structure has following technical problems:

[0003] 1.sealing surface is easily damaged under small opening condition.Under small opening condition (usually refers to opening less than 10%), steam produces strong erosion effect to valve core and valve seat sealing surface, sealing surface is damaged after long-term operation, sealing performance drops, in turn lead to valve not tightly closed, steam leakage, not only influence system efficiency, increase equipment maintenance cost, also possibly bring safety hidden trouble.

[0004] 2.single valve core structure leads to function conflict.Small opening condition sealing surface is easily damaged, and under large opening (opening is greater than 30%), although scouring is weakened, but long-term accumulated wear still can influence sealing performance when closing, cannot give consideration to regulating stability and sealing reliability.

[0005] Some existing regulating valves adopt hard alloy or special surface treatment technology to improve the wear resistance of sealing surface, this method is high in cost, and can only delay but not fundamentally solve the scouring problem.Another scheme adopts multistage pressure reduction or labyrinth structure to reduce flow rate and reduce scouring, but this kind of valve structure is complex, high in manufacturing cost, and still can leak at small opening.

[0006] Therefore, a new type of steam regulating valve is needed, which can avoid direct scouring of sealing surface under small opening condition, and still maintain good regulating performance at large opening, so as to improve the service life and sealing reliability of valve.For this purpose, the utility model provides an adjustable nozzle type steam regulating valve, which effectively solves the above problems through the linkage design of cutting valve and regulating nozzle. UTILITY MODEL CONTENTS

[0007] The utility model aims at providing an adjustable nozzle type steam regulating valve to solve the above problems.

[0008] In order to realize the above purpose, the utility model provides the following technical scheme: an adjustable nozzle type steam regulating valve, comprising flow guide sleeve composed of balance cylinder fixedly installed on the top port of valve cage, and cutting valve core and regulating valve core installed on valve stem from top to bottom;

[0009] The valve stem moves along the flow guide sleeve in the axial direction to make the cut-off valve core and the regulating valve core move between the valve cage and the balance cylinder;

[0010] The end face of the top of the cut-off valve core is provided with pressure equalizing holes arranged in a circumferential array;

[0011] The end face of the top of the regulating valve core is provided with flow guide holes arranged in a circumferential array;

[0012] The balance cylinder is symmetrically provided with openings, and any one of the pressure equalizing holes and the flow guide holes is communicated with the openings.

[0013] Preferably, the outer side face of the valve cage is sequentially provided with a plurality of auxiliary regulating holes and main regulating holes arranged in a circumferential array from bottom to top, and the number of the auxiliary regulating holes is consistent with that of the main regulating holes.

[0014] Preferably, the auxiliary regulating hole is composed of three circular holes arranged at the vertices of an isosceles triangle.

[0015] Preferably, the main regulating hole is a long rectangle with a circular arc top, and the circular arc top is arranged towards the auxiliary regulating hole.

[0016] Preferably, the flow guide hole is a circular arc groove.

[0017] Preferably, the pressure equalizing hole is a circular hole.

[0018] Preferably, the valve body is further provided with a blocking piece, and the inside of the valve body is divided into a liquid inlet cavity and a liquid outlet cavity.

[0019] Preferably, the top of the valve body is fixedly provided with a valve cover fixed by a bolt and a nut, and the valve stem is extended out of a through hole provided on the valve cover.

[0020] Preferably, the number of the openings is not less than three.

[0021] In the above technical solution, the adjustable nozzle type steam regulating valve has the following beneficial effects: the split structure design of the application avoids the damage of the sealing surface caused by the medium passing through the nozzle at small opening degree, disperses the throttling impact of the valve cage at large opening degree, and avoids the damage of the cut-off valve core, thereby prolonging the service life of the valve. The valve cage adopts the main regulating hole and the auxiliary regulating hole, and the two-stage flow control (valve opening degree is 10-30% or >30%) realizes precise regulation, and ensures good control performance under various working conditions. In addition, the whole structure is compact, can be adapted to the existing valve installation space, and has low maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0023] Fig. 1 A cross-sectional structure schematic view provided by the present application embodiment;

[0024] Fig. 2 A cross-sectional structure schematic view of the balance cylinder and the valve cage provided by the present application embodiment;

[0025] Fig. 3 A cross-sectional structure schematic view of the cut-off valve core and the regulating valve core provided by the present application embodiment.

[0026] Explanation of reference signs:

[0027] 1, balance cylinder; 2, valve cage; 3, cut-off valve core; 4, regulating valve core; 5, opening; 6, adjusting hole; 61, auxiliary adjusting hole; 62, main adjusting hole; 7, valve rod; 8, pressure equalizing hole; 9, flow guide hole; 10, valve cover; 11, valve body; 12, bolt and nut DETAILED DESCRIPTION

[0028] In order to make those skilled in the art better understand the technical scheme of the present application, the present application will be further described in detail below with reference to the drawings.

[0029] As shown in the drawings, Figs. 1-3 An adjustable nozzle type steam regulating valve includes a flow guide sleeve, and a cut-off valve core 3 and a regulating valve core 4 welded on the valve rod 7 from top to bottom. The flow guide sleeve in the embodiment includes a valve cage 2 and a balance cylinder 1, and the ports of the valve cage 2 and the balance cylinder 1 are connected to each other and can be welded to form a whole.

[0030] The side wall of the balance cylinder 1 is provided with a plurality of openings 5, and the openings 5 are distributed close to the balance cylinder 1.

[0031] The outer side surface of the valve cage 2 is sequentially provided with a plurality of auxiliary adjusting holes 61 and main adjusting holes 62 distributed in a circumferential array from bottom to top, and the number of the auxiliary adjusting holes 61 is consistent with that of the main adjusting holes 62. Fig. 2 It can be seen that one auxiliary adjusting hole 61 is composed of three circular holes distributed at the vertices of an isosceles triangle, and the main adjusting hole 62 is a long rectangle with a circular arc top on one side, and the circular arc top faces the auxiliary adjusting hole 61.

[0032] In the above embodiment, the driving valve rod 7 is moved along the guide sleeve in the axial direction to move the cut-off valve core 3 and the regulating valve core 4 between the valve cage 2 and the balance cylinder 1, so that the regulating valve core 4 releases the main regulating hole 62 or the auxiliary regulating hole 61, so that the entering liquid enters the inside of the valve cage 2 through the guide holes 9 arranged in a circular array on the top end face of the regulating valve core 4 and is discharged through the opening 5, or enters the inside of the valve cage 2 and is discharged through the pressure equalizing holes 8 arranged in a circular array on the top end face of the cut-off valve core 3 and then is discharged through the opening 5.

[0033] It should be noted that the guide holes 9 are circular arc grooves, and the pressure equalizing holes 8 are circular holes.

[0034] As a further embodiment of the utility model, the steam regulating valve comprises a valve body 11, the inside of the valve body 11 is divided into a liquid inlet cavity and a liquid outlet cavity by a blocking piece, the guide sleeve is put in through the mounting opening arranged on the top of the valve body 11, and the auxiliary regulating hole 61 and the main regulating hole 62 are both located in the liquid outlet cavity, and the opening 5 is located in the liquid inlet cavity.

[0035] Further, the top of the valve body 11 is fixedly provided with a valve cover 10 fixed through a bolt and a nut 12, and the valve rod 7 is arranged to extend out of the through hole arranged on the valve cover 10. Finally, the cut-off valve core 3 and the regulating valve core 4 are driven by the valve rod 7 to move up and down, so as to adjust the flow of the liquid outlet.

[0036] It should be noted that the sealing between the valve body structures is realized by a rubber ring. Since the valve body is a well-known common sense, the detailed internal sealing design is not described in detail.

[0037] Working principle:

[0038] 1. Valve closed state (0% opening), the regulating valve core 4 completely blocks the auxiliary regulating hole (61) and the main regulating hole (62).

[0039] 2. Small opening interval of the valve (0-10% opening), the cut-off valve core 3 and the regulating valve core 4 move up, the medium enters the valve through the opening 5 of the balance cylinder 1, the auxiliary regulating hole 61 is a certain distance from the bottom of the valve cage 2, at this time, the regulating nozzle (composed of the valve cage 2 and the regulating valve core 4) is still in the closed state, the pressure is balanced through the pressure equalizing holes 8 on the cut-off valve core 3 and is temporarily stored in the valve core inner cavity, so as to ensure that the sealing surface is not washed by the medium.

[0040] 3. Initial regulating interval of the valve (10%-30% opening), the cut-off valve core 3 and the regulating valve core 4 continue to move up, the regulating nozzle (composed of the valve cage 2 and the regulating valve core 4) starts to work, the medium flows out through the auxiliary regulating hole 61 of the valve cage 2, and the preliminary flow regulation is realized.

[0041] 4. Valve main regulation interval (30%-100% opening), cut-off valve core 3 and regulating valve core 4 continue to move up, gradually open the main regulation hole 62 on the valve cage 2, the auxiliary regulation hole 61 is fully open, starting two-stage flow regulation.

[0042] 5. Valve full open state (100% opening), cut-off valve core 3 and regulating valve core 4 reach the maximum stroke, the opening 5, the main regulation hole 62, and the auxiliary regulation hole 61 are fully open, the medium realizes accurate flow control through the main regulation hole 62 and the auxiliary regulation hole 61, and the influence of the throttling scour on the sealing surface is small.

[0043] The above only describes some exemplary embodiments of the present application by way of illustration, without doubt, for ordinary skilled in the art, without departing from the spirit and scope of the present application, the described embodiments can be modified in various ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the present application.

Claims

1. An adjustable nozzle type steam regulating valve, characterized in that, It includes a flow guide sleeve consisting of a balance cylinder (1) fixedly installed on the top port of the valve cage (2), and a cut-off valve core (3) and a regulating valve core (4) installed from top to bottom on the valve stem (7). The valve stem (7) moves axially along the guide sleeve so that the cut-off valve core (3) and the regulating valve core (4) move between the valve cage (2) and the balance cylinder (1); The cut-off valve core (3) has pressure equalization holes (8) arranged in a circular array on the top end face; The top end face of the regulating valve core (4) is provided with guide holes (9) arranged in a circumferential array. The balance cylinder (1) is symmetrically provided with openings (5), and either the pressure equalization hole (8) or the flow guide hole (9) is connected to the opening (5).

2. The adjustable nozzle type steam regulating valve according to claim 1, characterized in that, The outer side of the valve cage (2) is provided with a plurality of auxiliary adjustment holes (61) and main adjustment holes (62) arranged in a circular array from bottom to top, and the number of the two is the same.

3. The adjustable nozzle type steam regulating valve according to claim 2, characterized in that, The auxiliary adjustment hole (61) consists of three circular holes arranged in the shape of the vertices of an isosceles triangle.

4. The adjustable nozzle type steam regulating valve according to claim 2, characterized in that, The main adjustment hole (62) is a long rectangle with one side having a rounded top, and the rounded top is distributed towards the auxiliary adjustment hole (61).

5. An adjustable nozzle-type steam regulating valve according to claim 1, characterized in that, The guide hole (9) is a circular arc groove.

6. The adjustable nozzle type steam regulating valve according to claim 1, characterized in that, The equalizing hole (8) is a round hole.

7. An adjustable nozzle-type steam regulating valve according to claim 1, characterized in that, It also includes a valve body (11), which is divided into an inlet chamber and an outlet chamber by a blocking element. The guide sleeve is inserted through the installation port opened on the top of the valve body (11), while the auxiliary adjustment hole (61) and the main adjustment hole (62) are both located in the outlet chamber, and the opening (5) is located in the inlet chamber.

8. An adjustable nozzle-type steam regulating valve according to claim 7, characterized in that, The valve body (11) is fixedly mounted on the top of a valve cover (10) by bolts and nuts (12), and the valve stem (7) extends out from a through hole in the valve cover (10).

9. An adjustable nozzle-type steam regulating valve according to claim 1, characterized in that, The number of openings (5) is not less than three.

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