CN212251200U - Hot valve - Google Patents

Abstract

The utility model provides a hot valve, including valve body and disk seat, the disk seat is located the valve body inner chamber, still includes the spacer bush with the same kind of material of valve body, and the spacer bush is located the sealed face department between valve body and the disk seat, spacer bush and disk seat interference fit, with the valve body welding. Compared with the prior art, the utility model provides a technical scheme adopts interference fit and hot-filling technology to convert dissimilar metal welding into same kind of metal welding to the inflation volume of welding seam both sides part is unanimous when having guaranteed temperature variation, has eliminated the defect of welding seam fracture, thereby satisfies the requirement of wind-tunnel test device to the hot valve.

Description

Hot valve

Technical Field

The utility model belongs to the technical field of valving, concretely relates to valve body-disk seat mounting structure of hot valve is particularly useful for hypersonic wind tunnel high temperature valve switch field in service.

Background

The heat storage heater needs to preheat the heat storage element for a long time, the maximum preheating temperature is 900 ℃, and the maximum pressure is 12.0 Mpa. In order to reduce the influence of heat on equipment behind the heater, a valve needs to be arranged at the outlet of the heater to reduce the heat transfer. According to the operation requirement of the equipment, the hot valve has the function of quick opening and closing, and the equipment is quickly started by quickly opening the hot valve.

At present, the valve seat of the existing hot valve is made of GH3128 material, the valve body welded with the hot valve is made of F304 material, and the valve seat and the valve body are welded. The research finds that: when the working temperature is rapidly increased or decreased, the welding line is cracked due to the difference of the linear expansion coefficients of the dissimilar materials, so that cooling water in the valve seat leaks into the valve cavity, and the test fails; this is also a significant reason for the short operating life of such valves.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a hot valve, the new design of its valve body-disk seat mounting structure can eliminate the trouble of the dissimilar material welding seam fracture that the temperature reversal arouses, guarantees operational reliability and improves working life.

The technical scheme of the utility model as follows:

a hot valve comprises a valve body and a valve seat, wherein the valve seat is positioned in an inner cavity of the valve body, and the hot valve is characterized in that: the valve further comprises a spacer bush made of the same material as the valve body, the spacer bush is located on a sealing surface between the valve body and the valve seat, and the spacer bush is in interference fit with the valve seat and welded with the valve body.

Furthermore, the spacer bush and the valve seat are in interference fit, and the spacer bush is in interference fit realized by adopting a hot-fitting process.

Furthermore, the valve seat is provided with an upper cylindrical surface and a lower cylindrical surface along the axial direction, and the spacer bush is correspondingly divided into an upper spacer bush and a lower spacer bush.

Furthermore, the valve body and the spacer bush are both made of F304.

Furthermore, the valve seat is made of GH 3128.

The fixed connection link of the valve seat and the valve body of the hot valve comprises the following steps:

a. heating the spacer bush until the inner diameter is enlarged due to thermal expansion, and keeping the valve seat in a cold state;

b. pressing the spacer bush into the valve seat by using a tool, enabling the spacer bush to wrap the cylindrical surface of the valve seat to form a valve seat assembly, and then cooling to normal temperature;

c. the cylindrical surface of the spacer bush is used as a sealing surface with the valve body to complete the welding of the valve seat assembly and the valve body.

Further, before the step c, preprocessing before welding is carried out on the valve seat assembly which is subjected to hot assembly, so that the requirements of the next step of welding with the valve body are met.

Wherein, the valve body and the spacer bush are both made of F304.

In step a, the spacer was heated to 800 ℃.

The utility model has the advantages that:

the utility model discloses an interference fit and hot-charging technology convert dissimilar metal welding into same kind metal welding to the inflation volume of welding seam both sides part is unanimous when having guaranteed temperature variation, has eliminated the defect of welding seam fracture, thereby satisfies the requirement of heat accumulation formula heater test device to the hot valve.

The utility model discloses guarantee the reliability of work, improved the life and the economic nature of valve.

The utility model discloses a valve body-disk seat mounting structure can wide application in trip valve disk seat and valve body structure on high temperature, high-pressure return circuit. The structure can effectively eliminate the leakage of cooling water in the valve seat from the welding line caused by the cracking of the welding line under the condition of ensuring sealing, and damages the whole high-temperature loop.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a cross-sectional view of the general structure of the thermal valve of the present invention: 1. the hydraulic valve comprises a valve body, 2 parts of a lower spacer bush, 3 parts of a valve seat, 4 parts of an upper spacer bush, 5 parts of a valve core, 6 parts of a valve cover, 7 parts of a support and 8 parts of a hydraulic cylinder.

Fig. 2 is a partial detailed view of the present invention.

In fig. 2: 1. the valve comprises a valve body, 2 parts of a lower spacer bush, 3 parts of a valve seat and 4 parts of an upper spacer bush.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The present invention will be further explained by way of examples with reference to the accompanying drawings.

As shown in fig. 1, the hot valve suitable for the heat accumulating type heater comprises a valve body 1, a lower spacer bush 2, a valve seat 3, an upper spacer bush 4, a valve core 5, a valve cover 6, a support 7 and a hydraulic cylinder 8, wherein the valve seat 3 is positioned in an inner cavity of the valve body 1, the valve cover 6 is arranged above the valve body 1, the support 7 is connected onto the valve cover 6, the hydraulic cylinder 8 is fixed onto the support 7, and the valve core 5 of the hydraulic cylinder 8 sequentially penetrates through the support 7, the valve cover 6 and the valve seat 3 from top to bottom to penetrate into the.

As shown in fig. 2, in the present embodiment, a spacer is disposed between the valve seat 3 and the valve body 1, the spacer and the valve seat 3 are in interference fit, the spacer and the valve body 1 are connected by welding, and the spacer is made of the same material as that of the valve body 1, i.e., F304. The lower spacer 2 (made of F304) and the upper spacer 4 (made of F304) are respectively arranged on the upper cylindrical surface and the lower cylindrical surface of the valve seat 3 (made of GH3128), are in interference fit with the valve seat 3, and the lower spacer 2 and the upper spacer 4 are required to be heated to 800 ℃ and the valve seat 3 is in a cold state without being heated. When the upper spacer 4 and the lower spacer 2 are heated to 800 ℃, the inner diameters thereof are expanded by thermal expansion, at the moment, the upper spacer 4 and the lower spacer 2 are respectively pressed into the upper cylinder and the lower cylinder of the valve seat 3 by a tool, and the temperature is cooled to normal temperature. And performing semi-finishing on the valve seat assembly subjected to hot charging to meet the requirement of welding with the valve body 1 (made of F304) in the next step.

In the embodiment, the valve seat 3 and the spacer bush are integrated into a whole by adopting interference fit and a hot charging process, and the material of the spacer bush is consistent with that of the valve body 1, so that the welding of the valve seat 3 and the valve body 1 is converted into the welding of the upper spacer bush 4 and the lower spacer bush 2 with the valve body 1. Therefore, cooling water in the valve seat 3 can not be leaked due to the cracking of the welding line, the phenomenon that the welding line of dissimilar metal cracks under the working condition of temperature alternation is avoided, the reliability of the hot valve is effectively improved, and the service life of the hot valve is effectively prolonged.

The performance index of the thermal valve of the embodiment in a certain heat accumulating type heater test is as follows: the working medium is air, the drift diameter of the valve is 150mm, the working pressure is 12.0MPa, the using temperature is 900 ℃, the opening and closing time is less than 2s, and the sealing performance meets the specification of API 598-96.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (5)

1. A hot valve, includes valve body (1) and disk seat (3), disk seat (3) are located valve body (1) inner chamber, its characterized in that: the valve is characterized by further comprising a spacer bush made of the same material as the valve body (1), wherein the spacer bush is located on a sealing surface between the valve body (1) and the valve seat (3), and is in interference fit with the valve seat (3) and welded with the valve body (1).

2. The thermal valve of claim 1, wherein: the spacer bush is in interference fit with the valve seat (3), and the spacer bush is in interference fit realized by adopting a hot-filling process.

3. A thermal valve according to claim 1 or 2, wherein: the valve seat (3) is provided with an upper cylindrical surface and a lower cylindrical surface along the axial direction, and the spacer bush is correspondingly divided into an upper spacer bush (4) and a lower spacer bush (2).

4. The thermal valve of claim 1, wherein: the valve body (1) and the spacer bush are both made of F304.

5. The thermal valve according to claim 1 or 4, wherein: the valve seat (3) is made of GH 3128.

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