Large-caliber temperature and pressure reducing valve

Abstract

The utility model relates to the technical field of temperature and pressure reducing valves, and discloses a large-caliber temperature and pressure reducing valve which comprises a valve body provided with a steam inlet and a steam outlet, a valve seat is arranged in the valve body, a valve sleeve is arranged on the valve seat, a valve element matched with the valve sleeve is arranged in the valve sleeve, and a valve core is arranged in the valve element. The upper end of the valve element is connected with a valve rod used for enabling the valve element to move up and down, the lower end of the valve element is provided with a nozzle used for being communicated with an external desuperheating water pipe, and the valve sleeve comprises an outer sleeve, a middle sleeve and an inner sleeve which are sequentially and coaxially arranged from outside to inside in a sleeved mode. A first through hole, a second through hole and a third through hole are circumferentially and uniformly formed in the outer sleeve, the middle sleeve and the inner sleeve respectively, and a first included angle, a second included angle and a third included angle are formed between the axial center lines of the first through hole, the second through hole and the third through hole and the axis of the valve sleeve respectively; and the first through hole, the second through hole and the third through hole are arranged in a staggered manner along the same direction. The problem that the surface material of a valve element of a temperature and pressure reducing valve in the prior art is rapidly abraded under the large-flow and high-pressure-difference medium working condition is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to temperature and pressure reducing valve technical field especially relates to a large diameter temperature and pressure reducing valve. BACKGROUND

[0002] Temperature and pressure reducing valve is adopted to control the opening of the opening and closing part in the valve body to adjust the flow of medium, reduces the pressure of medium, adjusts the opening of the opening and closing part by the action of the pressure behind the valve, makes the pressure behind the valve keep in a certain range, and sprays the cooling water in the valve body or behind the valve, reduces the temperature of medium.

[0003] The traditional temperature and pressure reducing valve has serious valve core erosion phenomenon under the medium working condition of large flow and high pressure difference, and the main reasons usually include high flow rate direct impact caused by high pressure difference, solid particle impact in fluid and the like. These factors are particularly obvious under the working condition of large flow and high pressure difference, and cause the surface material of valve core to be rapidly worn. SUMMARY

[0004] Therefore, the utility model discloses a large diameter temperature and pressure reducing valve, solves the problem that the surface material of valve core is rapidly worn under the medium working condition of large flow and high pressure difference in the prior art.

[0005] The utility model discloses a large diameter temperature and pressure reducing valve, including the valve body being equipped with steam import and steam export, be equipped with the valve seat in the valve body, be equipped with the valve sleeve on the valve seat, be equipped with the valve core with the valve sleeve cooperation in the valve sleeve, the upper end of valve core is connected with the valve rod for making valve core moves up and down, the lower extreme of valve core is equipped with the nozzle for with external temperature reducing water pipe intercommunication, the valve sleeve includes the outer sleeve, the middle sleeve and the inner sleeve of the outer sleeve, the middle sleeve and the inner sleeve are coaxial sleeve from outside to inside gradually, first through -hole, second through -hole and third through -hole are set up in the outer sleeve, the middle sleeve and the inner sleeve respectively and are evenly distributed in circumference, the axial center line of first through -hole, second through -hole and third through -hole is first included angle, second included angle and third included angle with the axis of the valve sleeve respectively, and first through -hole, second through -hole and third through -hole are arranged in the same direction.

[0006] Optionally, the first included angle, the second included angle and the third included angle increase in turn. The first included angle, the second included angle and the third included angle increase in turn so that the medium fluid generates a rotational flow after passing through the valve sleeve, the rotational flow of the medium fluid is preliminarily disturbed through the first through -hole, the rotational flow intensity is further strengthened through the second through -hole, and the fluid is spirally accelerated to the maximum through the third through -hole.

[0007] Optionally, the hole diameters of the first through hole, the second through hole and the third through hole are sequentially reduced.

[0008] Optionally, the valve sleeve is threadedly connected with the valve body.

[0009] Optionally, the top of the valve sleeve is provided with a boss.

[0010] Optionally, the valve body is provided with two cavities corresponding to positions where the steam inlet and the steam outlet are located.

[0011] Optionally, gaps are arranged between the outer sleeve, the middle sleeve and the inner sleeve, and the gaps are sequentially reduced, for balancing pressure drop and flow rate.

[0012] The utility model discloses the beneficial effect of:

[0013] The utility model discloses an improved valve sleeve structure of temperature and pressure reducing valve, sets up the outer sleeve, the middle sleeve and the inner sleeve of the coaxial sleeve from outside to inside, and the first through hole, the second through hole and the third through hole are arranged on the outer sleeve, the middle sleeve and the inner sleeve and are evenly distributed in the circumferential direction, the hole diameter of the first through hole, the second through hole and the third through hole changes in cooperation with the opening direction change, compared with the traditional throttle orifice plate structure, step-by-step throttling pressure reduction is realized through the layered through hole, the single valve pressure difference load is effectively reduced, and excessive wear of the valve core is avoided, meanwhile, the high temperature and high pressure steam forms the cyclone when passing through the first through hole, the second through hole and the third through hole, thereby dissipating the kinetic energy of the fluid, so that the valve sleeve realizes the functions of kinetic energy grading dissipation and impact angle deviation, and the impact of the medium fluid on the valve core is greatly reduced. In addition, the cyclone is also beneficial to the uniformity of the mixing of the temperature reducing water sprayed by the nozzle, and helps to promote the mixing with the cooling medium (temperature reducing water), so as to enhance the heat exchange efficiency and improve the temperature reducing effect. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is the internal structure schematic view of the valve body of the utility model;

[0015] Figure 2 is the structure schematic view of the valve sleeve of the utility model;

[0016] Figure 3 is Figure 2 the A-A section schematic view of the middle.

[0017] Wherein, 1-valve body, 11-steam inlet, 12-steam outlet, 13-valve seat, 14-valve sleeve, 141-outer sleeve, 1411-first through hole, 142-middle sleeve, 1421-second through hole, 143-inner sleeve, 1431-third through hole. DETAILED DESCRIPTION

[0018] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures. They should not be construed as limiting the utility model. To better illustrate the embodiments of this utility model, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the figures for those skilled in the art.

[0019] In the figures of this utility model embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe the positional relationship in the figure are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

[0020] like Figures 1-3 As shown, this utility model discloses a large-diameter desuperheating and pressure-reducing valve, including a valve body 1 with a steam inlet 11 and a steam outlet 12. The valve body 1 has two cavities corresponding to the locations of the steam inlet 11 and the steam outlet 12, respectively. A valve seat 13 is provided inside the valve body 1, and a valve sleeve 14 is provided on the valve seat 13. A valve core (referring to the core component that enables the valve to control the function) is provided inside the valve sleeve 14. The upper end of the valve core is connected to a valve stem for moving the valve core up and down, and the lower end of the valve core is provided with a nozzle for communicating with an external desuperheating water pipe. The up and down movement of the valve core changes the flow area of ​​the high-temperature and high-pressure steam through the valve sleeve to achieve flow regulation. At the same time, the desuperheating water sprayed from the nozzle is used to desuperheat the steam. The specific structure and principle of this type of conventional integrated desuperheating and pressure-reducing valve will not be described in detail, including the valve stem driving device, the communication method between the desuperheating water pipe and the nozzle, etc.

[0021] In this embodiment, to cope with the working conditions of high flow rate and high pressure difference of the medium, the conventional desuperheating and pressurizing valve is improved. Specifically, the valve sleeve 14 includes an outer sleeve 141, a middle sleeve 142, and an inner sleeve 143 coaxially sleeved from the outside to the inside. The outer sleeve 141, the middle sleeve 142, and the inner sleeve 143 are respectively provided with a first through hole 1411, a second through hole 1421, and a third through hole 1431 evenly distributed circumferentially, and the first through hole 1411, the second through hole 1421, and the third through hole 1431 are arranged in a staggered manner along the same direction. For example, in this embodiment, as...Figure 2 、 Figure 3 As shown in the figure, the outer sleeve 141, the middle sleeve 142 and the inner sleeve 143 have the same number of through holes, each layer of through holes has the same height, the centers of the first through holes 1411, the second through holes 1421 and the third through holes 1431 have the same height, and are arranged in the circumferential direction in the clockwise or counterclockwise direction.

[0022] In this embodiment, the axial center lines of the first through holes 1411, the second through holes 1421 and the third through holes 1431 and the axis of the valve sleeve 14 form a first angle, a second angle and a third angle, respectively, and the first angle, the second angle and the third angle increase in turn. The first angle is 10°, the second angle is 20°, and the third angle is 30°. At the same time, due to the arrangement of the first through holes 1411, the second through holes 1421 and the third through holes 1431 in the circumferential direction in the clockwise or counterclockwise direction, and the change of the through hole opening direction (i.e. the change of the angle), when the high-temperature and high-pressure steam passes through the first through holes 1411, the second through holes 1421 and the third through holes 1431, a rotational flow is formed, thereby dissipating the kinetic energy of the fluid, greatly reducing the impact of the high-temperature and high-pressure steam fluid on the valve core, and enabling the valve sleeve 14 to realize the functions of kinetic energy hierarchical dissipation and impact angle deviation.

[0023] In this embodiment, the hole diameters of the first through holes 1411, the second through holes 1421 and the third through holes 1431 decrease in turn. Compared with the traditional throttle orifice plate structure, the multi-stage sleeve type valve sleeve 14 realizes step-by-step throttling and pressure reduction through layered through holes, effectively reduces the single valve pressure difference load, avoids excessive wear of the guide valve core, and at the same time improves the adjustment stability under large flow conditions.

[0024] In this embodiment, in order to ensure the convenience and stability of the installation of the valve sleeve 14, the valve sleeve 14 is threadedly connected with the valve body 1, and the top of the valve sleeve 14 is provided with a boss. There is a gap between the outer sleeve, the middle sleeve and the inner sleeve, and the gap decreases in turn. However, it should be understood that there may be solid particle impurities in the medium fluid, and the minimum gap between the middle sleeve and the inner sleeve should be greater than the average particle size of the impurities, so as to avoid the jamming of the solid particle impurities in the gap.

[0025] The working principle of the large-diameter temperature and pressure reducing valve is as follows:

[0026] When the large-diameter temperature and pressure reducing valve is used, the fluid medium (large flow, high pressure difference working condition) enters the valve body 1 through the steam inlet 11, reaches the valve sleeve 14, passes through the first through holes 1411, the second through holes 1421 and the third through holes 1431 in turn, and the reduced flow medium reaches the cavity where the steam outlet 12 is located, and is mixed with the reduced temperature water sprayed by the nozzle for temperature reduction, and then flows out from the steam outlet 12.

[0027] During the process, the relative displacement of the valve core is changed to adjust the flow area of the valve sleeve 14, thereby controlling the flow. Specifically, the valve sleeve 14 adopts a multi-layer sleeve structure, which gradually reduces the pressure and flow rate, thereby protecting the valve core and the valve seat 13 from direct impact of high pressure difference and high speed fluid, particles in the fluid, reducing the wear of the valve core surface material, and prolonging the service life of the valve. In addition, the through hole opening structure of the valve sleeve 14 makes the medium fluid produce a rotational vortex, which helps to promote mixing with the cooling medium (desuperheating water) to enhance the heat exchange efficiency and improve the desuperheating effect.

[0028] The above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced without departing from the spirit and scope of the present application, and all should be covered in the scope of the claims of the present application. The technical, shape and structure parts not described in detail in the present application are well-known technologies.

Claims

1. A large-diameter temperature and pressure reducing valve, comprising a valve body (1) provided with a steam inlet (11) and a steam outlet (12), a valve seat (13) arranged in the valve body (1), a valve sleeve (14) arranged on the valve seat (13), a valve core arranged in the valve sleeve (14) and cooperating with the valve sleeve (14), an upper end of the valve core being connected with a valve rod for moving the valve core up and down, and a nozzle arranged at a lower end of the valve core for communicating with an external desuperheating water pipe, characterized in that: the valve sleeve (14) comprises an outer sleeve (141), a middle sleeve (142) and an inner sleeve (143) arranged coaxially from outside to inside in sequence, first through holes (1411), second through holes (1421) and third through holes (1431) are evenly arranged on the outer sleeve (141), the middle sleeve (142) and the inner sleeve (143) in a circumferential direction respectively, axial center lines of the first through holes (1411), the second through holes (1421) and the third through holes (1431) and an axis of the valve sleeve (14) form first, second and third included angles respectively, and the first through holes (1411), the second through holes (1421) and the third through holes (1431) are arranged in a same direction. The first, second and third included angles increase in sequence.

2. The large bore pressure and temperature reducing valve of claim 1, wherein: The first through holes (1411), the second through holes (1421) and the third through holes (1431) decrease in diameter in sequence.

3. The large bore pressure and temperature reducing valve of claim 1, wherein: The valve sleeve (14) is threadedly connected with the valve body (1).

4. The large bore pressure and temperature reducing valve of claim 1, wherein: A boss is arranged at a top of the valve sleeve (14).

5. The large bore pressure and temperature reducing valve of claim 1, wherein: The valve body (1) is provided with two cavities corresponding to positions of the steam inlet (11) and the steam outlet (12) respectively.

6. The large bore pressure and temperature reducing valve of claim 1, wherein: Gaps are arranged between the outer sleeve (141), the middle sleeve (142) and the inner sleeve (143) and decrease in sequence.

7. The large bore pressure and temperature reducing valve of claim 1, wherein: ​

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