CN102518869B - Stop valve - Google Patents

Abstract

The invention provides a shut-off valve, comprising: a valve body (1) and a valve core (2), the valve body (1) includes a valve cavity (101) and a sealing cone (102), and the valve body (1) is provided with A fluid inlet nozzle (103) and a fluid outlet nozzle (104), the valve body (1) are also provided with a coolant inlet nozzle (105) and a coolant outlet nozzle (106), and the valve body (1) is provided with There is a first coolant pipeline (107), a second coolant pipeline (202) is arranged in the spool (2), a coolant inlet joint (105), the first coolant pipeline (107), the second The coolant pipeline (202) communicates with the coolant outlet nozzle (106) in sequence. In the present invention, a circuit of cooling liquid is set in the valve body and the valve core, which can simultaneously cool the valve body, the valve core and the sealing surfaces of both, thus greatly enhancing the cooling effect of the shut-off valve and making the shut-off valve suitable for at higher operating temperatures.

Description

Shut-off valve

technical field

The invention relates to the field of valves, in particular to a water-cooled ultra-high temperature cut-off valve.

Background technique

Globe valves need to be installed in many high-temperature fluid piping systems. Since the globe valves are used in high-temperature environments, their various physical and mechanical properties will change, resulting in high-temperature globe valves being extremely difficult in terms of structural design and material selection. strict. When the operating temperature of the globe valve exceeds 450°C, the globe valve is prone to creep and fracture. At present, high-temperature globe valves are mainly made of high-temperature-resistant materials, but when the maximum working temperature exceeds 730°C, the globe valve is no longer suitable. On the other hand, the current high-temperature globe valve usually adopts separate design of the valve body and the globe valve control actuator, and the focus is on the cooling of the sealing surface of the disc and the valve seat, ignoring the cooling of the valve core sealing structure and the valve control mechanism, which makes The sealing structure of the valve core is prone to failure, and as the heat continues to transfer, it is also likely to pose a threat to the valve control mechanism, making it difficult to handle higher operating temperatures.

Contents of the invention

The purpose of the present invention is to provide a cut-off valve to solve the technical problems that the spool of the cut-off valve is easily deformed when exposed to high temperature and the sealing effect is weakened.

In order to achieve the above object, according to one aspect of the present invention, a shut-off valve is provided, including: a valve body and a valve core, the valve body includes a valve cavity and a sealing cone surface, and the valve body is provided with a fluid inlet port and a fluid outlet port. The mouth, the fluid inlet nozzle and the fluid outlet nozzle are respectively connected with the valve cavity; the valve core includes a sealing cone head, the valve core is set in the valve cavity, the sealing cone head can be movably set at the sealing cone surface, the sealing cone head and the sealing The sealing fit between the cone surfaces; the valve body is also provided with a coolant inlet nozzle and a coolant outlet nozzle, a first coolant pipeline is arranged in the valve body, a second coolant pipeline is arranged in the valve core, and the coolant The inlet nozzle, the first coolant pipeline, the second coolant pipeline and the coolant outlet nozzle are connected in sequence.

Further, a coolant inlet and a coolant outlet are provided on the peripheral wall of the valve core, the first coolant pipeline and the second coolant pipeline communicate through the coolant inlet, and the second coolant pipeline and the coolant outlet nozzle pass through The coolant outlet is connected.

Further, the valve body is provided with a first sealing ring and a second sealing ring on the inner wall between the coolant inlet and the valve chamber, and both the first sealing ring and the second sealing ring are metal sealing rings.

Further, the valve body is also provided with a first liquid collection chamber, a second liquid collection chamber and a third liquid collection chamber, the first liquid collection chamber is arranged on the outer circumference of the first sealing ring and the second sealing ring, and the second liquid collecting chamber It is arranged at the position where the cooling liquid inlet is connected with the valve body, and the third liquid collection chamber is arranged between the cooling liquid outlet nozzle and the cooling liquid outlet.

Further, the second end of the valve core is provided with a shoulder, and the space surrounded by the valve body, the valve core and the shoulder forms a first air chamber, and the valve body is provided with a first air hole nozzle, and the first air hole nozzle is connected to the first air hole. One air cavity is connected; the stop valve also includes a valve cover, which is covered at the end of the valve body, and the space enclosed between the valve cover and the valve core forms a second air cavity, and the valve cover is provided with a second air hole nozzle , the second air hole nozzle is connected with the second air cavity.

Further, a third seal ring is provided on the inner wall of the valve between the second liquid collection chamber and the third liquid collection chamber; a fourth sealing ring is provided on the inner wall of the valve between the third liquid collection chamber and the first air chamber. ring; a fifth sealing ring is arranged on the inner wall of the valve between the first air chamber and the second air chamber.

Further, the valve body includes a valve seat and a valve cylinder, the valve seat and the valve cylinder are fixedly connected; the valve seat is provided with a positioning boss and a perforated plate, and the valve cylinder and the valve seat are positioned and assembled through the positioning boss and the perforated plate.

Further, the valve core includes a valve head and a valve stem, and the valve head and the valve stem are fixedly connected; the valve stem is provided with a positioning groove, and the valve stem and the valve head are positioned and assembled through the positioning groove.

Further, the inside of the valve head is a cavity, the second end of the valve stem is set as a hollow pipe, the second end of the valve stem extends into the cavity, and the outer peripheral wall of the second end of the valve stem is in contact with the inner peripheral wall of the cavity. There is a gap between them; the gap between the outer peripheral wall of the second end of the valve stem and the inner peripheral wall of the cavity and the hollow pipeline at the second end of the valve stem constitute the second cooling liquid pipeline.

Further, the valve seat, the valve cylinder, the valve head and the valve stem are integrally cut from a superalloy; the valve seat and the valve cylinder are fixedly connected by welding, and the valve head and the valve stem are fixedly connected by welding.

The present invention has the following beneficial effects:

1. In the present invention, a cooling liquid circuit is set in the valve body and the valve core, which can simultaneously cool the valve body, the valve core and the sealing surfaces of the two. In this way, the cooling effect of the shut-off valve is greatly enhanced, so that the shut-off valve Valves are available for higher operating temperatures.

2. In the present invention, three liquid collecting cavities are arranged between the valve body and the valve core, and the cooling liquid flow path between the three liquid collecting cavities is relatively narrow, so that under the condition that sufficient cooling liquid can be ensured, the flow The coolant flow rate in the circuit is relatively high, which can prevent the formation of dead water zones and enhance the cooling and heat transfer effect.

3. The pressure difference on both sides of the orifice plate between the first liquid collection chamber and the second liquid collection chamber can make the cooling water evenly flow into the second liquid collection chamber from all sides to ensure the uniformity of cooling; the opening position is close to the wall, which can further Enhanced cooling of the wall.

4. The second liquid collection chamber and the third liquid collection chamber can cool the valve core, valve stem and valve barrel while serving as the inlet and outlet of the valve core cooling channel, so as to prevent the heat transfer to the upper part of the valve barrel and cause the air chamber sealing structure The failure and the sharp change of the operating gas temperature and pressure bring uncertainty to the valve control.

5. The shut-off valve of the present invention is provided with two gas cavities between the valve body, the valve core and the valve cover, and high-pressure gas is injected or discharged into the two gas cavities to push the valve core to move up and down to realize the shut-off valve. Opening and closing makes the control mechanism of the stop valve simpler, and the control operation is more convenient and simple.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. Hereinafter, the present invention will be described in further detail with reference to the drawings.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a schematic cross-sectional structure diagram of a shut-off valve in a preferred embodiment of the present invention; and

Fig. 2 is a schematic cross-sectional structure diagram of a valve seat in a preferred embodiment of the present invention;

Fig. 3 is a schematic cross-sectional structure diagram of a valve core in a preferred embodiment of the present invention.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

Referring to Fig. 1, the shut-off valve of the present invention is mainly used in high-temperature fluid pipelines to realize the on-off of high-temperature fluids. The shut-off valve includes: a valve body 1 and a valve core 2, and a high-temperature fluid passage is arranged in the valve body 1. The valve core 2 is arranged in the valve body 1 , and the valve core 2 can move back and forth along the axial direction in the valve body 1 . A sealing mechanism is provided between the valve core 2 and the valve body 1 , and when the high-temperature fluid flows through the valve body 1 , the high-temperature fluid can be cut off through the engagement of the valve core 2 and the valve body 1 .

2 and 3, the valve body 1 is provided with a valve chamber 101 and a sealing cone 102 inside, the valve body 1 is provided with a fluid inlet nozzle 103 and a fluid outlet nozzle 104, the fluid inlet nozzle 103 and the fluid outlet nozzle The nozzles 104 communicate with the valve cavity 101 respectively, that is, the fluid inlet nozzle 103 , the valve cavity 101 and the fluid outlet nozzle 104 form a flow path of high-temperature fluid in the shut-off valve. The first end of the valve core 2 is provided with a sealing cone 201, the first end of the valve core 2 is assembled in the valve cavity 101, the sealing cone 201 is movably arranged at the sealing cone surface 102, the sealing cone 201 and the sealing cone There is a sealing fit between the faces 102. When the high-temperature fluid needs to be cut off, the sealing cone head 201 is moved close to the sealing cone surface 102 and the two are closely attached to realize the fluid cut-off; when the high-temperature fluid needs to be unblocked, the sealing cone head 201 is moved away from the sealing cone surface 102, Achieve fluid flow.

A coolant inlet nozzle 105 and a coolant outlet nozzle 106 are also provided on the valve body 1 , and a first coolant pipeline 107 is arranged inside the valve body 1 . The valve core 2 is provided with a second coolant pipeline 202, and the coolant inlet nozzle 105, the first coolant pipeline 107, the second coolant pipeline 202 and the coolant outlet nozzle 106 are connected in sequence to form the shut-off valve. cooling flow path. The coolant inlet nozzle 105 is arranged on the side wall of the valve body 1 opposite to the fluid outlet nozzle 104; the first coolant pipeline 107 is arranged around the valve cavity 101 and the installation cavity of the valve core 2 of the valve body 1; The second coolant pipeline 202 is arranged inside the valve core 2 . Preferably, the second coolant pipeline 202 is set as a turn-back pipeline in the valve core 2, that is, the second coolant pipeline 202 first flows along the periphery of the valve core 2 to the sealing cone 201, and then flows along the valve core 2. The axis of the coolant flows to the coolant outlet nozzle 106, forming a zigzag cooling flow path. When the cooling liquid flows through the cooling flow path, the valve core can be effectively cooled to prevent the sealing surface from failing due to high temperature creep. At the same time, the cooling of the wall surface of the valve core can reduce the threat of high temperature to the first sealing ring 11 and the second sealing ring 12 which are in contact with it.

Please refer to FIG. 3 , preferably, a coolant inlet 203 and a coolant outlet 204 are provided on the peripheral wall of the valve core 2, the first coolant pipeline 107 and the second coolant pipeline 202 communicate through the coolant inlet 203, and the second The coolant pipeline 202 communicates with the coolant outlet nozzle 106 through the coolant outlet 204 . The inner wall of the valve body 1 between the coolant inlet 203 and the valve chamber 101 is provided with a first sealing ring 11 and a second sealing ring 12, the first sealing ring 11 and the second sealing ring 12 realize the sealing of the high temperature fluid and the cooling liquid, Prevents the two liquids from penetrating each other. The first sealing ring 11 is in contact with the high-temperature fluid, and is used to prevent the high-temperature fluid from penetrating into the second end of the valve core 2 . The second sealing ring 12 is in contact with the cooling liquid, and is used to prevent the cooling liquid from penetrating into the valve cavity 101 . Two sealing rings are arranged on the inner wall of the valve body 1 between the coolant inlet 203 and the valve cavity 101, so that the sealing effect between the valve body 1 and the valve core 2 is better; when the first sealing ring 11 is subjected to high temperature fluid When it fails due to influence, the high-temperature fluid penetrates between the first sealing ring 11 and the second sealing ring 12, and the second sealing ring 12 then plays the role of sealing the high-temperature fluid; at the same time, since the cooling liquid passes through the second sealing ring 12 Indirectly reducing the temperature of the seeping high-temperature fluid greatly reduces the thermal damage of the seeping high-temperature fluid, so that the shut-off valve will not cause the entire shut-off valve to fail due to the failure of the first sealing ring 11 . Preferably, both the first sealing ring 11 and the second sealing ring 12 are metal sealing rings, more preferably bronze sealing rings, so that the high temperature resistance of the sealing rings is better.

Preferably, the valve body 1 is further provided with a first liquid collection chamber 13 , a second liquid collection chamber 14 and a third liquid collection chamber 15 . The first liquid collection chamber 13 is arranged on the outer circumference of the first sealing ring 11 and the second sealing ring 12, and the cooling liquid is accumulated in this area to cool the sealing groove, which can effectively reduce the pressure of the first sealing ring 11 and the second sealing ring 12. Working temperature, thereby greatly enhancing the sealing effect and high temperature resistance of the first sealing ring 11 and the second sealing ring 12. The second liquid collecting chamber 14 is arranged at the position where the cooling liquid inlet 203 is connected to the valve body 1, the third liquid collecting chamber 15 is arranged between the cooling liquid outlet nozzle 106 and the cooling liquid outlet 204, and the second liquid collecting chamber 14 and The third liquid collecting chamber 15 cools down the valve body 1 and the valve core 2 step by step, and ensures smooth circulation of the cooling liquid in the first cooling liquid pipeline 107 and the second cooling liquid pipeline 202 . Preferably, a third sealing ring 18 is provided on the inner wall of the valve body 1 between the second liquid collection chamber 14 and the third liquid collection chamber 15, so as to prevent the cooling liquid from directly penetrating from the second liquid collection chamber 14 to the third liquid collection chamber. The cavity 15 does not flow through the second coolant pipeline 202, so that the inside of the valve core 2 cannot be sufficiently cooled, and the third sealing ring 18 is preferably a fluorine rubber O-ring.

Preferably, the second end of the valve core 2 is provided with a shoulder 205, the space surrounded by the valve body 1, the valve core 2 and the shoulder 205 forms the first air chamber 16, and the valve body 1 is provided with a first air hole nozzle 108 , the first air hole nozzle 108 communicates with the first air cavity 16 . The shut-off valve also includes a valve cover 3, which covers the end of the valve body 1, and the space enclosed between the valve cover 3 and the valve core 2 forms a second air cavity 17, and the valve cover 3 is provided with a second The air hole mouthpiece 301 , the second air hole mouthpiece 301 communicates with the second air cavity 17 . When gas is filled into the first air chamber 16 and the gas in the second air chamber 17 is discharged, the shoulder 205 on the valve core 2 moves downward under the pressure difference between the first air chamber 16 and the second air chamber 17. The valve cover 3 moves, and drives the valve core 2 to move to the valve cover 3, so as to realize the separation of the sealing cone head 201 and the sealing cone surface 102; When the gas is exhausted, the valve core 2 moves toward the valve chamber 101 under the action of the pressure difference between the second air chamber 17 and the first air chamber 16 to realize the contact between the sealing cone head 201 and the sealing cone surface 102 . Preferably, a fourth sealing ring 19 is provided on the inner wall of the valve body 1 between the third liquid collection chamber 15 and the first air chamber 16; A fifth sealing ring 20 is provided. The fourth sealing ring 19 and the fifth sealing ring 20 realize the airtight sealing of the first air chamber 16 and the second air chamber 17, and the fourth sealing ring 19 and the fifth sealing ring 20 are preferably fluorine rubber O-rings.

Please refer to Fig. 2, as another embodiment, the valve body 1 includes a valve seat 4 and a valve cylinder 5, the valve seat 4 and the valve cylinder 5 are fixedly connected; the valve seat 4 is provided with a positioning boss 41 and a perforated plate 42, the valve The barrel 5 and the valve seat 4 are positioned and assembled through the positioning boss 41 and the perforated plate 42 . In this way, the valve body 1 is divided into two parts, the valve seat 4 and the valve barrel 5, which makes the valve body 1 more convenient to manufacture, especially when processing the internal structure of the valve body 1, it is more time-saving and labor-saving, and it is easier to process to achieve precise processing. The valve core 2 includes a valve head 6 and a valve stem 7, the valve head 6 and the valve stem 7 are fixedly connected; the valve stem 7 is provided with a positioning groove 71, and the valve stem 7 and the valve head 6 are positioned and assembled through the positioning groove 71. In this way, the valve core 2 is divided into two parts, the valve head 6 and the valve stem 7, making the processing of the valve head 6 and the valve stem 7 more convenient and easy. Preferably, the valve seat 4, the valve barrel 5, the valve head 6 and the valve stem 7 are integrally cut from a superalloy, the valve seat 4 and the valve barrel 5 are fixedly connected by welding, and the valve head 6 and the valve stem 7 are fixedly connected by welding. Preferably, the interior of the valve head 6 is a cavity 61, the second end of the valve stem 7 is set as a hollow pipe, the second end of the valve stem 7 extends into the cavity 61, and the outer peripheral wall of the second end of the valve stem 7 There is a gap between the inner peripheral wall of the cavity 61; the gap between the second end outer peripheral wall of the valve stem 7 and the inner peripheral wall of the cavity 61 and the hollow pipeline at the second end of the valve stem 7 constitute the second coolant pipe Road 202.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. A globe valve, comprising: a valve body (1) and a valve core (2), the valve body (1) includes a valve cavity (101) and a sealing cone (102), the valve body (1) A fluid inlet nozzle (103) and a fluid outlet nozzle (104) are provided, and the fluid inlet nozzle (103) and the fluid outlet nozzle (104) communicate with the valve cavity (101) respectively; The valve core (2) includes a sealing cone (201), the valve core (2) is set in the valve cavity (101), and the sealing cone (201) is movably set on the sealing cone surface (102), sealing fit between the sealing cone head (201) and the sealing cone surface (102); It is characterized in that, The valve body (1) is also provided with a coolant inlet nozzle (105) and a coolant outlet nozzle (106), and the valve body (1) is provided with a first coolant pipeline (107), so The valve core (2) is provided with a second coolant pipeline (202), the coolant inlet nozzle (105), the first coolant pipeline (107), the second coolant pipeline (202) communicates with the coolant outlet nozzle (106) in sequence; A coolant inlet (203) and a coolant outlet (204) are provided on the peripheral wall of the valve core (2), and the first coolant pipeline (107) and the second coolant pipeline (202) pass through The cooling liquid inlet (203) communicates, and the second cooling liquid pipeline (202) communicates with the cooling liquid outlet joint (106) through the cooling liquid outlet (204). 2. The stop valve according to claim 1, characterized in that, The valve body (1) is provided with a first seal ring (11) and a second seal ring (12) on the inner wall between the coolant inlet (203) and the valve cavity (101), the first seal ring (11) and the second seal ring (12). The first sealing ring (11) and the second sealing ring (12) are metal sealing rings. 3. The stop valve according to claim 2, characterized in that, The valve body (1) is also provided with a first liquid collection chamber (13), a second liquid collection chamber (14) and a third liquid collection chamber (15), and the first liquid collection chamber (13) is set in the The outer circumference of the first sealing ring (11) and the second sealing ring (12), the second liquid collection chamber (14) is set at the position where the cooling liquid inlet (203) is connected to the valve body (1) In the connected position, the third liquid collecting cavity (15) is arranged between the cooling liquid outlet joint (106) and the cooling liquid outlet (204). 4. The stop valve according to claim 3, characterized in that, The second end of the valve core (2) is provided with a shoulder (205), and the space enclosed by the valve body (1), the valve core (2) and the shoulder (205) forms a first air A cavity (16), the valve body (1) is provided with a first air hole nozzle (108), and the first air hole nozzle (108) is connected to the first air cavity (16); The cut-off valve also includes a valve cover (3), the valve cover (3) covers the end of the valve body (1), between the valve cover (3) and the valve core (2) The enclosed space forms a second air chamber (17), the valve cover (3) is provided with a second air hole nozzle (301), and the second air hole nozzle (301) is connected to the second air chamber ( 17) Connect. 5. The stop valve according to claim 4, characterized in that, A third sealing ring (18) is provided on the inner wall of the valve body (1) between the second liquid collecting chamber (14) and the third liquid collecting chamber (15); A fourth sealing ring (19) is provided on the inner wall of the valve body (1) between the third liquid collecting chamber (15) and the first air chamber (16); A fifth sealing ring (20) is arranged on the inner wall of the valve body (1) between the first air chamber (16) and the second air chamber (17). 6. The stop valve according to claim 5, characterized in that, The valve body (1) includes a valve seat (4) and a valve cylinder (5), and the valve seat (4) and the valve cylinder (5) are fixedly connected; The valve seat (4) is provided with a positioning boss (41) and a hole plate (42), and the valve cylinder (5) and the valve seat (4) pass through the positioning boss (41) and the Described perforated plate (42) positioning assembly. 7. The stop valve according to claim 6, characterized in that, The valve core (2) includes a valve head (6) and a valve stem (7), and the valve head (6) and the valve stem (7) are fixedly connected; The valve stem (7) is provided with a positioning groove (71), and the valve stem (7) and the valve head (6) are positioned and assembled through the positioning groove (71). 8. The stop valve according to claim 7, characterized in that, The interior of the valve head (6) is a cavity (61), the second end of the valve stem (7) is set as a hollow pipe, and the second end of the valve stem (7) extends into the cavity In the cavity (61), there is a gap between the outer peripheral wall of the second end of the valve stem (7) and the inner peripheral wall of the cavity (61); The gap between the outer peripheral wall of the second end of the valve stem (7) and the inner peripheral wall of the cavity (61) and the hollow pipe at the second end of the valve stem (7) constitute the second cooling liquid pipeline (202). 9. The stop valve according to claim 8, characterized in that, The valve seat (4), the valve barrel (5), the valve head (6) and the valve stem (7) are integrally cut from superalloy; The valve seat (4) and the valve cylinder (5) are fixedly connected by welding, and the valve head (6) and the valve stem (7) are fixedly connected by welding.

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