Ultralow-temperature axial-flow type check valve

Abstract

The utility model relates to an ultralow-temperature axial-flow type check valve which comprises a valve body, the interior of the valve body is a cavity penetrating through two ends, one end of the cavity is a medium inlet, the other end of the cavity is a medium outlet, and the middle part of the cavity is a valve body middle cavity; a flow guide body is arranged in a middle cavity of the valve body, a mandrel is arranged in a cavity at the inlet end of the valve body, and a valve clack is arranged on the mandrel. One end of the mandrel faces a cavity of the inlet end of the valve body and is supported on the inner wall of the valve body through a supporting body, the other end of the mandrel extends in the opposite direction of the inlet end of the valve body and extends into the flow guiding body, and a valve seat is welded to the contact position, close to the inlet end of the valve body, of the valve clack. A pressure balance groove is formed in the circumferential direction of the flow guide body, the flow guide body is of a water-drop-shaped structure, and the pressure balance groove is designed, so that compared with a conventional flow guide body without a groove structure, the flow guide body has the advantages that fluid resistance is small, valve opening is rapid, the phenomenon that media accumulate liquid and pressure in the flow guide body is avoided, and the effect of reducing vibration and noise is effectively achieved.

Description

Technical Field

[0001] The utility model relates to an ultra-low temperature axial flow check valve, belonging to the technical field of check valves. Background Art

[0002] Ultra-low temperature axial flow check valves are suitable for liquefied natural gas and other media with temperatures above -196°C. With the rapid development of the valve industry, and in line with the specific operating conditions of the valves, the performance requirements for check valves are gradually increasing. For example, the connection between the valve seat and the valve body, the sealing performance of the valve seat and the valve disc, the positioning accuracy of the valve disc, the fluid resistance of the valve internal guide body, and the noise prevention of the valve opening and closing are all factors that need to be considered.

[0003] Therefore, it is necessary to develop an ultra-low temperature axial flow check valve that meets the above performance requirements to meet the high standards and high requirements of valves. Utility Model Content

[0004] In view of the fact that the above-mentioned check valve can meet the requirements for its various performances, the purpose of the utility model is to provide an ultra-low temperature axial flow check valve, which has a reasonable structural design, good sealing, anti-leakage, high reliability, high practicality and other characteristics.

[0005] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: an ultra-low temperature axial flow check valve, comprising: a valve body, an interior of the valve body is a cavity running through both ends, one end of the cavity is a medium inlet, the other end is a medium outlet, and the middle part is a valve body middle cavity; a guide body is arranged at the position of the valve body middle cavity, a core shaft is arranged in the cavity at the valve body inlet end, and a valve disc is arranged on the core shaft; one end of the core shaft faces the cavity at the valve body inlet end and is supported by the valve body inner wall through a support body, the other end of the core shaft extends in the opposite direction of the valve body inlet end and extends into the interior of the guide body, and the outer periphery of the end of the core shaft extending into the interior of the guide body is connected to the inner wall of the guide body through a connecting rib plate; a valve seat is welded to the contact position of the valve disc near the valve body inlet end, and the valve disc and the valve seat are sealed; a spring is sleeved between the rear part of the valve disc and the end of the core shaft extending into the guide body; a pressure balancing groove is opened in the circumference of the guide body, and the outer wall of the tail of the guide body is connected to the inner wall of the valve body outlet end through a connecting rib plate.

[0006] This solution is applicable to liquefied natural gas media and other media with temperatures above -196°C.

[0007] Furthermore, the guide body is in a "water drop" shape, the valve body cavity is in an elliptical structure, and a streamlined cavity is formed between the guide body and the inner wall of the valve body cavity;

[0008] Furthermore, the outer diameter of the support body at one end of the core shaft connected to the support body is connected to the inner wall of the valve body by a screw thread, and the core shaft is inserted into the central hole of the support body by providing a first guide sleeve on its outer periphery;

[0009] Furthermore, a second guide sleeve is provided on the outer diameter of one end of the core shaft located inside the guide body, and a connecting ring is provided on the outside of the second guide sleeve and is connected to the connecting rib plate through the connecting ring;

[0010] Furthermore, a step structure is provided at one end of the valve disc close to the spring, and a protrusion is provided on the second guide sleeve, the protrusion forming a first step structure and a second step structure at both ends of the second guide sleeve; the spring is fixed between the step surface of the valve disc step structure and the step surface of the first step structure of the second guide sleeve;

[0011] Furthermore, the spring is in the form of a cylindrical spiral;

[0012] Furthermore, the step surface of the second step structure of the second guide sleeve is used to cooperate with the connecting ring on the outer diameter of the second guide sleeve.

[0013] Furthermore, the end of the guide body facing the valve body inlet end is the large-diameter end, and conversely, the end facing the valve body outlet end is the small-diameter end, i.e., the tail of the guide body; the guide body is provided with a plurality of pressure balancing grooves on the guide body wall along the circumferential direction, and the closing position of the small-diameter end is open and communicated with the cavity at the valve body outlet end;

[0014] Generally, the number of the pressure balancing grooves is set to 3 and is evenly arranged along the circumference of the guide body;

[0015] Furthermore, the outer wall of the small-diameter end of the flow guide is connected to the connecting rib plate, and the outer wall of the connecting rib plate is connected to the inner wall of the outlet end of the valve body by a screw thread.

[0016] Furthermore, in the check valve of this solution, the valve body adopts an integral forging structure, the material structure is dense, and the physical properties are excellent;

[0017] Furthermore, both ends of the valve body are welded to the pipeline to ensure that the valve has no external leakage points;

[0018] Furthermore, the valve seat is welded to the valve body, completely eliminating the leakage path between the valve seat and the valve body;

[0019] Furthermore, the valve seat and valve disc sealing surface are welded with hard alloy to achieve wear resistance and enhance the sealing effect, so that the sealing pair can achieve perfect sealing effect at room temperature and -196 degrees Celsius.

[0020] Furthermore, the valve disc is synchronously guided by two guide sleeves at both ends, which has high positioning accuracy and low wear;

[0021] Furthermore, the rear side of the valve disc is loaded with a cylindrical coil spring, which provides an initial pre-tightening sealing force and simultaneously plays a role in dynamically closing the valve disc, thereby reducing valve noise and avoiding collision between the valve disc and the valve seat.

[0022] The working principle of this ultra-low temperature axial flow check valve is as follows: the medium enters the valve from the inlet, pushing the valve disc to move toward the outlet side, and the valve opens; when the inlet pressure drops to a certain range, it will form a dynamic balance with the spring, and the valve disc will dynamically close slowly, achieving a noiseless and impact-free closing effect, preventing the explosion of flammable and explosive media; when the force of the medium on the inlet side is less than the combined force of the backflow medium force and the spring, the valve is completely closed.

[0023] The beneficial effects of adopting the ultra-low temperature axial flow check valve of the utility model are:

[0024] The valve body adopts an integral forging structure with dense material structure and excellent physical properties. Both ends are welded to the pipeline to ensure that the valve has no external leakage points. The valve seat adopts a welded structure with the valve body to completely eliminate the leakage channel between the valve seat and the valve body. The sealing surface of the valve seat and the valve disc is welded with hard alloy to achieve wear resistance and enhance the sealing effect, so that the sealing pair can achieve perfect sealing effect at room temperature and -196 degrees Celsius. The valve disc is synchronously guided by two front and rear guide sleeves, with high positioning accuracy and low wear. The rear side of the valve disc is loaded with a cylindrical coil spring, which provides the initial pre-tightening sealing force and also plays a role in dynamically closing the valve disc, achieving the effect of reducing valve noise and avoiding collision between the valve disc and the valve seat. The guide body adopts a teardrop-shaped structure to reduce fluid resistance, saving energy and playing a role in green environmental protection.

[0025] The design of the special pressure balance groove on the diverter body has the advantages of small fluid resistance, rapid valve opening, and avoidance of liquid accumulation in the diverter body, compared with the conventional diverter body without grooves, which effectively reduces vibration and noise.

[0026] The valve seat and valve disc of this solution achieve complete metal-to-metal sealing, which enhances wear resistance and reduces the risk of leakage caused by the huge difference in thermal expansion and contraction between metal and non-metal at low temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of an ultra-low temperature axial flow check valve (closed state) of the utility model.

[0028] Figure 2 This is a schematic diagram of the medium flow process during the opening process of the check valve of the utility model.

[0029] Figure 3 This is a structural diagram of an ultra-low temperature axial flow check valve (open state) of the utility model.

[0030] Figure 4 This is a schematic diagram of the medium flow process during the closing process of the check valve of the utility model.

[0031] In the figure, 1, valve body, 2, medium inlet, 3, medium outlet, 4, valve body cavity, 5, guide body, 6, core shaft, 7, valve disc, 8, support body, 9, connecting rib plate, 10, valve seat, 11, spring, 12, pressure balance groove, 13, streamlined cavity, 14, first guide sleeve, 15, second guide sleeve, 16, connecting ring, 5.1, large-diameter end, 5.2, small-diameter end, 17, lifting eye screw. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] like Figure 1-4 The ultra-low temperature axial flow check valve shown in the figure comprises: a valve body 1, the interior of the valve body 1 is a cavity that passes through both ends, one end of the cavity is a medium inlet 2, the other end is a medium outlet 3, and the middle part is a valve body cavity 4; a guide body 5 is arranged at the position of the valve body cavity 4, a core shaft 6 is arranged in the cavity at the inlet end of the valve body 1, and a valve disc 7 is arranged on the core shaft 6; one end of the core shaft 6 faces the cavity at the inlet end of the valve body 1 and is supported on the inner wall of the valve body 1 by a support body 8, and the other end of the core shaft 6 extends in the opposite direction to the inlet end of the valve body 1 The valve body 1 has a plurality of inner portions, each of which is provided with a plurality of inner portions, and the outer portion of the valve body 1 is provided with a plurality of inner portions, and the outer portion of the valve body 1 is provided with a plurality of inner portions, and the plurality of inner portions are provided with plurality of outer portions. The valve body 1 has a plurality of inner portions, and the plurality of inner portions are provided with ...

[0034] This solution is applicable to liquefied natural gas media and other media with temperatures above -196°C.

[0035] The guide body 5 is in a "water drop" shape, and the valve body cavity 4 is in an elliptical structure. A streamlined cavity 13 is formed between the guide body 5 and the inner wall of the valve body cavity 4, which has high fluidity. The design of the water drop-shaped guide body 5 can reduce fluid resistance, save energy, and be environmentally friendly.

[0036] The outer diameter of the support body 8 at one end of the core shaft 6 is connected to the inner wall of the valve body 1 by a screw thread, and the core shaft 6 is inserted into the central hole of the support body 8 by providing a first guide sleeve 14 on its outer periphery;

[0037] A second guide sleeve 15 is provided on the outer diameter of one end of the core shaft 6 located inside the guide body 5. A connecting ring 16 is provided on the outside of the second guide sleeve 15 and is connected to the connecting rib 9 through the connecting ring 16.

[0038] The valve disc 7 is provided with a step structure at one end close to the spring 11, and a protrusion is provided on the second guide sleeve 15, which forms a first step structure and a second step structure at both ends of the second guide sleeve 15; the spring 11 is fixed between the step surface of the step structure of the valve disc 7 and the step surface of the first step structure of the second guide sleeve 15;

[0039] The spring 11 is in the form of a cylindrical spiral;

[0040] The step surface of the second step structure of the second guide sleeve 15 is used to cooperate with the connecting ring 16 on the outer diameter of the second guide sleeve 15 .

[0041] The end of the guide body 5 facing the inlet end of the valve body 1 is the large-diameter end 5.1, and the end facing the outlet end of the valve body 1 is the small-diameter end 5.2, i.e., the tail end of the guide body 5. The guide body 5 is provided with a plurality of pressure balancing grooves 12 on the guide body wall along the circumferential direction. The small-diameter end 5.2 is open and communicates with the cavity at the outlet end of the valve body 1.

[0042] The outer wall of the small-diameter end 5.2 of the flow guide 5 is connected to the connecting rib plate 9, and the outer wall of the connecting rib plate 9 is connected to the inner wall of the outlet end of the valve body 1 by a screw thread.

[0043] The pressure balancing groove 12 provided on the guide body 5 has the advantages of low fluid resistance, rapid valve opening, and avoidance of liquid accumulation and pressure buildup in the guide body 5, thereby effectively reducing vibration and noise.

[0044] In the check valve of this solution, the valve body 1 adopts an integral forging structure, the material structure is dense, and the physical properties are excellent;

[0045] The two ends of the valve body 1 are welded to the pipeline to ensure that there is no external leakage point of the valve;

[0046] The valve seat 10 is welded to the valve body 1, completely eliminating the leakage path between the valve seat 10 and the valve body 1;

[0047] The sealing surfaces of the valve seat 10 and the valve disc 7 are made of hard alloy for overlay welding to achieve wear resistance and enhance the sealing effect, so that the sealing pair can achieve perfect sealing effect at room temperature and -196 degrees Celsius.

[0048] The valve disc 7 is synchronously guided by two guide sleeves at both ends, with high positioning accuracy and low wear;

[0049] The rear side of the valve disc 7 is loaded with a cylindrical coil spring 11. The spring 11 provides an initial pre-tightening sealing force and at the same time plays a role in dynamically closing the valve disc 7, thereby reducing valve noise and avoiding collision between the valve disc 7 and the valve seat 10.

[0050] The outer diameters of both ends of the valve body 1 are further provided with lifting screws 17 to facilitate transportation and installation of the valve; two lifting screws 17 are provided to ensure lifting balance.

[0051] The working principle of this ultra-low temperature axial flow check valve is as follows: the medium enters the valve from the inlet 2, pushing the valve disc 7 to move toward the outlet 3 side, and the valve opens; when the pressure of the inlet 2 drops to a certain range, it will form a dynamic balance with the spring 11, and the valve disc 7 will dynamically close slowly, achieving a noiseless and impact-free closing effect, preventing the flammable and explosive medium from deflagration; when the force of the medium on the inlet 2 side is less than the combined force of the backflow medium force and the spring 11, the valve is completely closed.

[0052] The specific operation process of opening and closing this valve is:

[0053] When there is no medium flow or the medium flows back, the valve is in the closed state. At this time, the sealing surface of the valve disc 7 is attached to the valve seat 10 under the action of the spring 11. Figure 1 As shown; when the medium flows in the forward direction, the medium enters the cavity from the inlet of the valve body 1 and acts on the front end surface of the valve disc 7. Under the action of the medium force, the valve disc 7 moves toward the outlet side, realizing the valve opening. Most of the medium flows to the right from the streamlined cavity 13 outside the guide body 5, and part of the medium enters from the large-diameter end 5.1 of the guide body 5 and flows out through the pressure balance groove 12 on the guide body 5. At the same time, it also flows out from the small-diameter end 5.2 of the guide body 5. In this process, the medium flow resistance is small due to the provision of the pressure balance groove 12 and the opening of the small-diameter end 5.2 of the guide body, so that the valve can be opened quickly. The specific medium flow process of the above valve opening is shown in FIG. Figure 2 As shown;

[0054] When the valve is fully opened, Figure 3 As shown; the valve needs to be closed. When the pressure at the valve inlet becomes smaller, the medium will flow back. In this process, a part of the medium flows out to the left through the streamlined cavity 13 outside the guide body 5. The medium also enters the guide body 5 through the pressure balance groove 12 of the guide body 5 and flows in the direction of the large-diameter end 5.1 of the guide body. The valve disc 7 is pushed toward the valve seat 10 by the driving force of this part of the medium until the sealing surface of the valve disc 7 is attached to the valve seat 10, realizing complete closure of the valve; the process of valve closing is that the force of the medium at the valve inlet is less than the combined force of the backflow medium and the spring 11; the specific medium flow process of the above-mentioned valve closing is as follows Figure 4 shown.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0057] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0058] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0059] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

Claims

1. An ultra-low temperature axial flow check valve, characterized in that: include: The valve body has a cavity running through both ends, one end of the cavity is a medium inlet, the other end is a medium outlet, and the middle part is a middle cavity of the valve body; a guide body is arranged at the position of the middle cavity of the valve body, a core shaft is arranged in the cavity at the inlet end of the valve body, and a valve disc is arranged on the core shaft; one end of the core shaft faces the cavity at the inlet end of the valve body and is supported on the inner wall of the valve body through a support body, and the other end of the core shaft extends in the opposite direction of the inlet end of the valve body and extends into the interior of the guide body, and the outer periphery of the end head of the core shaft extending into the interior of the guide body is connected to the inner wall of the guide body through a connecting rib plate; a valve seat is welded to the contact position of the valve disc close to the inlet end of the valve body, and the valve disc and the valve seat are sealed; a spring is sleeved between the rear part of the valve disc and the end of the core shaft extending into the guide body; a pressure balancing groove is opened circumferentially on the guide body, and the outer wall of the tail of the guide body is connected to the inner wall of the valve body outlet end through a connecting rib plate.

2. The ultra-low temperature axial flow check valve according to claim 1, characterized in that: The guide body has a "water drop" shaped structure, the valve body cavity has an elliptical structure, and a streamlined cavity is formed between the guide body and the inner wall of the valve body cavity.

3. The ultra-low temperature axial flow check valve according to claim 1, characterized in that: The outer diameter of the support body at one end of the core shaft is connected to the valve body wall in a screw thread manner, and the core shaft is inserted into the center hole of the support body by arranging a first guide sleeve on its outer periphery.

4. The ultra-low temperature axial flow check valve according to claim 1, characterized in that: A second guide sleeve is provided on the outer diameter of one end of the core shaft located inside the guide body. A connecting ring is provided on the outside of the second guide sleeve and is connected to the connecting rib plate through the connecting ring.

5. The ultra-low temperature axial flow check valve according to claim 4, characterized in that: A step structure is provided at one end of the valve disc close to the spring, and a protrusion is provided on the second guide sleeve, which forms a first step structure and a second step structure at both ends of the second guide sleeve; the spring is fixed between the step surface of the valve disc step structure and the step surface of the first step structure of the second guide sleeve.

6. The ultra-low temperature axial flow check valve according to claim 1, characterized in that: The spring is in the form of a cylindrical helix.

7. The ultra-low temperature axial flow check valve according to claim 1, characterized in that: The end of the guide body facing the inlet end of the valve body is the large-diameter end, and conversely, the end facing the outlet end of the valve body is the small-diameter end, that is, the tail of the guide body; the guide body is provided with a plurality of pressure balancing grooves on the guide body wall along the circumferential direction, and the closing position of the small-diameter end is open and connected to the cavity at the outlet end of the valve body.

8. The ultra-low temperature axial flow check valve according to claim 7, characterized in that: The outer wall of the small-diameter end of the flow guide is connected to the connecting rib plate, and the outer wall of the connecting rib plate is connected to the inner wall of the outlet end of the valve body through a screw thread.

9. The ultra-low temperature axial flow check valve according to claim 1, characterized in that: The valve body adopts an integral forging structure, the valve seat adopts a welded structure with the valve body, and the valve seat and valve disc sealing surface adopts surfacing hard alloy.

10. The ultra-low temperature axial flow check valve according to claim 1, characterized in that: Lifting eye screws are also provided on the outer diameters of both ends of the valve body.

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