Novel safety throttle valve

Abstract

The invention relates to the technical field of valves, in particular to a novel safety throttle valve which comprises a valve body, a valve seat, a valve element, a valve rod, an executing mechanism and a displacement sensor, the valve seat is cylindrical, a first groove is formed in the inner cylindrical surface of the valve seat in the circumferential direction, and a connecting hole is formed in the valve seat; the connecting hole is communicated to the outer cylindrical surface of the valve seat from the bottom surface of the first groove; the valve element is arranged in the valve seat in a sleeved mode, a second groove is formed in the outer cylindrical face of the valve element and extends to the lower surface of the valve element from a certain position of the outer cylindrical face of the valve element, and the width of the second groove is gradually increased along the extending path of the second groove; through the gradually-changing width design of the second groove of the valve element, the second groove becomes wider from top to bottom and is matched with the first groove of the valve seat to form a variable throttling area, the height of the valve element and the throttling area are in a linear relation or a square relation, stepless fine adjustment of the opening degree is achieved, and the stepless fine adjustment valve is superior to a traditional fixed gear adjustment mode.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a novel safety throttle valve. Background Art

[0002] Safety throttle valves are widely used in the process of natural gas extraction, and the extraction pressure of natural gas is not constant. The throttle valve is mainly used to adjust the outlet flow. When the gas pressure decreases, the area of ​​the throttle hole needs to be increased to increase the throttle valve opening. In the prior art, a cage-type structure is generally used, such as the inner cage-type throttle valve of patent CN203374244U, which is provided with multiple rows of throttle holes. However, during the movement of the valve stem, the throttle area will jump in a step-like manner, such as Figure 8 As shown, the requirement of accurately regulating the medium flow cannot be met. Summary of the invention

[0003] The problem solved by the present invention is: in order to solve the problem that the safety throttle valve in the prior art cannot meet the requirement of accurately regulating the medium flow, a new safety throttle valve capable of accurately regulating the flow is provided.

[0004] The present invention is implemented through the following technical scheme: a new type of safety throttle valve, comprising

[0005] Valve body;

[0006] Valve seat; the valve seat is cylindrical, the upper and lower ports of the valve seat are both sealed and connected to the valve body, and the L-shaped cavity in the valve body is divided into an inlet cavity and an outlet cavity. The inner cylindrical surface of the valve seat is provided with a first groove along the circumferential direction, and the valve seat is provided with a connecting hole, and the connecting hole is connected from the bottom surface of the first groove to the outer cylindrical surface of the valve seat;

[0007] The valve core is sleeved in the valve seat and can at least slide up and down relatively. The outer cylindrical surface of the valve core is provided with a second groove, and the second groove extends from a certain point of the outer cylindrical surface of the valve core to the lower surface of the valve core, and the width of the second groove gradually widens along its extension path; when the valve core moves to the lowest position, the second groove and the first groove of the valve seat are not connected; after the valve core moves upward, the first groove and the second groove can be connected;

[0008] The valve stem and the valve core are fixedly connected or integrally formed;

[0009] Actuator; the movable shaft of the actuator is connected to the valve stem;

[0010] Displacement sensor; the displacement sensor is connected to the movable shaft of the actuator.

[0011] Furthermore, the first grooves are equidistant annular grooves.

[0012] Furthermore, the starting point of the second groove is close to the upper end surface of the valve core, and extends vertically downward along the generatrix direction of the outer cylindrical surface of the valve core. The width of the second groove is narrow at the top and wide at the bottom.

[0013] Furthermore, the second groove is a spiral groove, and the width of the second groove is narrower at the top and wider at the bottom along the spiral line.

[0014] Furthermore, the number of the second grooves is one or more.

[0015] Furthermore, the first groove is an annular groove with non-equidistant spacing, and the narrowest part of the first groove gradually widens along the circumferential direction and finally communicates with the narrowest part.

[0016] Furthermore, the second groove is a spiral groove, and the width of the second groove is narrower at the top and wider at the bottom along the spiral line.

[0017] Furthermore, the valve stem is provided with a limiting mechanism for limiting the rotation of the valve core.

[0018] Furthermore, there are multiple connecting holes.

[0019] Furthermore, the connection holes are evenly distributed on the circumference.

[0020] The beneficial effects of the present invention are:

[0021] 1. The second groove of the valve core is designed with a gradual width, which becomes wider as it goes downwards, and cooperates with the first groove of the valve seat to form a variable throttling area. The valve core height is linearly or squarely related to the throttling area. Combined with the hydraulic actuator and the displacement sensor, the opening can be adjusted steplessly and finely, which is superior to the traditional fixed gear adjustment method.

[0022] 2. The present invention can significantly increase the maximum equivalent throttling area and improve the adjustment range by increasing the number of second grooves and the number of flow channels.

[0023] 3. The second groove of the present invention is configured as a spiral groove, so that the fluid forms a swirl path, thereby preventing impurities from accumulating in the first groove and reducing the risk of blockage.

[0024] 4. The present invention achieves a balance between fine adjustment of small openings and rapid response of large openings by combining the shapes of the grooves, with the first grooves of unequal widths cooperating with the second grooves with downward spiral lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of a novel safety throttle valve according to Example 1;

[0026] Figure 2 for Figure 1 A partial enlarged view of the middle I;

[0027] Figure 3 This is a schematic diagram of the structure of the valve seat in Example 1;

[0028] Figure 4 This is a schematic structural diagram of a valve core and a valve stem in Embodiment 1;

[0029] Figure 5 This is a schematic structural diagram of a valve seat, a valve core and a valve stem in accordance with the first embodiment;

[0030] Figure 6 It is a circumferential side unfolded view of the first groove and the second groove of Example 1;

[0031] Figure 7 It is a schematic diagram of the overlap between the second groove and the first groove in Example 1;

[0032] Figure 8 Graph showing the relationship between the equivalent throttling area and the height of the valve core in Embodiments 1 to 5;

[0033] Fig. 9 It is a circumferential side unfolded view of the first groove and the second groove of the second embodiment;

[0034] Fig.10 This is a schematic diagram of the structure of the valve core and valve stem of Example 3;

[0035] Fig.11 This is a schematic diagram of the structure of the valve seat, valve core and valve stem of Example 3;

[0036] Fig.12 This is a circumferential side view of the first groove and the second groove of Example 3;

[0037] Fig.13 This is a schematic diagram of the overlap between the second groove and the first groove in Example 3;

[0038] Fig.14 This is a circumferential side view of the first groove and the second groove of Example 4;

[0039] Fig.15 This is a circumferential side view of the first groove and the second groove of Example 5;

[0040] Fig.16 This is a schematic diagram of the overlap between the second groove and the first groove in Example 5.

[0041] In the figure:

[0042] 1 valve body;

[0043] 2 valve seat; 201 first groove; 202 connecting hole;

[0044] 3 valve core; 301 second groove;

[0045] 4 valve stem;

[0046] 5. Executive body;

[0047] 6 displacement sensors. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Embodiment 1

[0050] like Figure 1-8 As shown, a new safety throttle valve comprises:

[0051] Valve body 1; the valve body 1 is a right-angle valve body 1;

[0052] Valve seat 2; Figure 3 As shown, the valve seat 2 is cylindrical, and the upper and lower ports of the valve seat 2 are both sealed and connected to the valve body 1, dividing the L-shaped cavity in the valve body 1 into an inlet cavity and an outlet cavity. The inner cylindrical surface of the valve seat 2 is provided with a first groove 201 along the circumferential direction, and the first groove 201 is an annular groove of equal width. The valve seat 2 is provided with eight connecting holes 202, and the connecting holes 202 are connected from the bottom surface of the first groove 201 to the outer cylindrical surface of the valve seat 2, and the eight connecting holes 202 are evenly distributed in the circumferential direction; the inlet cavity of the valve body 1 is enlarged at the connecting holes 202, so that the valve body 1 and the valve seat 2 maintain a sufficient gap to ensure the smooth passage of airflow;

[0053] Valve core 3; Figure 4 As shown, the valve core 3 is cylindrical and is sleeved in the valve seat 2. It can at least slide up and down relatively. The outer cylindrical surface of the valve core 3 is provided with a second groove 301. The starting point of the second groove 301 is close to the upper end surface of the valve core 3 and extends vertically downward along the generatrix direction of the outer cylindrical surface of the valve core 3. The width of the second groove 301 becomes wider as it goes downward. The diameter of the lower position of the inner wall of the valve seat 2 becomes smaller and is provided with a transitional conical surface. The lower end of the valve core 3 is provided with a chamfer, as shown in FIG. Figure 5 As shown, when the valve core 3 moves to the lowest position, the chamfered conical surface and the conical surface of the inner wall of the valve seat 2 are offset, and the second groove 301 and the first groove 201 of the valve seat 2 are not connected; the valve core 3 is provided with a balancing air hole, which runs through the upper and lower surfaces of the valve core 3 and is used to balance the air pressure in the upper and lower cavities, which is not shown in the figure and will not be described in detail.

[0054] The valve stem 4 is fixedly connected to the valve core 3 or is integrally formed. In this embodiment, the valve stem 4 and the valve core 3 are integrally formed;

[0055] Actuator 5; the movable shaft of the actuator 5 is connected to the valve stem 4. In this solution, the actuator 5 adopts a hydraulic actuator 5, which is used to drive the valve stem 4 to rise and fall, thereby changing the height position of the valve core 3 in the valve seat 2;

[0056] Displacement sensor 6; the displacement sensor 6 is connected to the movable shaft of the actuator 5, and the displacement sensor 6 can detect the height position of the valve core 3 in the valve seat 2, so as to understand the opening of the valve.

[0057] When the throttle valve of this scheme is fully closed, Figure 5 and Figure 6 As shown, Figure 6 FIG. 2 is a circumferential side view of the first groove 201 and the second groove 301. The valve core 3 moves to the lowest position. At this time, the second groove 301 and the first groove 201 of the valve seat 2 are not connected. When working, the valve core 3 moves upward. Figure 7 As shown in FIG. 1 (a schematic diagram showing that the second groove 301 overlaps the first groove 201 when the valve core 3 moves), at this time, the second groove 301 is in contact with the first groove 201 and is connected, and the airflow path is valve inlet-connecting hole 202-first groove 201-second groove 301-valve outlet, and the effective throttling hole is the trapezoidal part where the first groove 201 and the second groove 301 overlap. Since the width of the second groove 301 becomes wider as it goes downward, and the width of the groove is linearly related to the vertical position of the groove, when the valve core 3 is located at different heights, the equivalent throttling area (the area of ​​the effective throttling hole) is different, and the equivalent throttling area is linearly related to the height of the valve core 3, as shown in FIG. Figure 8 As shown, only the height of the valve core 3 needs to be controlled to steplessly adjust the equivalent throttling area. In order to achieve fine adjustment of the height of the valve core 3, this solution is achieved by the hydraulic actuator 5 in conjunction with the displacement sensor 6. The distance feedback by the displacement sensor 6 determines the height of the valve core 3, and then controls the hydraulic actuator 5 to perform corresponding lifting operations.

[0058] Compared with the prior art which can only adjust the fixed gear, this solution is more precise in adjustment. When the inlet pressure fluctuates, the height of the valve core 3 can be adjusted in real time according to the feedback signal of the outlet flow, and the equivalent throttling area can be adjusted steplessly to achieve constant outlet flow.

[0059] Embodiment 2

[0060] like Fig. 9 As shown, Fig. 9FIG. 2 is a circumferential side view of the first groove 201 and the second groove 301 of this embodiment. The difference from the first embodiment is that: the second groove 301 on the valve core 3 is provided with two, and the two second grooves 301 are symmetrically arranged on both sides of the valve core 3. Compared with the first embodiment, the two second grooves 301 can increase the maximum equivalent throttling area, such as Figure 8 As shown, its equivalent throttling area is twice that of the first embodiment.

[0061] Embodiment 3

[0062] like Figure 10-12 As shown, the difference from the first and second embodiments is that the second groove 301 on the valve core 3 is one, and the second groove 301 extends downward along the spiral line to the bottom surface, and the width of the second groove 301 becomes wider as it goes downward. Compared with the above embodiments, when the valve core 3 rises, Fig.13 As shown (a schematic diagram of the overlap of the second groove 301 and the first groove 201 of this embodiment when the valve core 3 moves), the overlapping position of the first groove 201 and the second groove 301 is located at different positions of the first groove 201, which can ensure that there is no dead angle in the first groove 201, and impurities are not easily accumulated to prevent blockage.

[0063] Embodiment 4

[0064] like Fig.14 As shown, the difference from the third embodiment is that: there are two second grooves 301 on the valve core 3, and the two second grooves 301 are symmetrically arranged on both sides of the valve core 3, extending downward along the spiral line to the bottom surface, and the width of the second groove 301 becomes wider as it goes downward. Compared with the third embodiment, the two second grooves 301 can increase the maximum equivalent throttling area. Figure 8 As shown, its equivalent throttling area is twice that of the third embodiment.

[0065] Embodiment 5

[0066] like Fig.15 As shown, Fig.15 The circumferential side view of the first groove 201 and the second groove 301 of this embodiment is different from the third embodiment in that the second groove 301 on the valve core 3 is a single groove extending downward along the spiral line of the left-handed structure to the bottom surface, and the width of the second groove 301 becomes wider as it goes downward, the first groove 201 is a groove of non-uniform width, the narrowest part of the first groove 201 is located at the starting point of the second groove 301, and the first groove 201 gradually widens in the counterclockwise direction (viewed from above) from the narrowest part. Fig.16 As shown, Fig.16FIG. 2 is a circumferential side view of the first groove 201 and the second groove 301 of the present embodiment. As the valve core 3 gradually becomes flat, the overlapping portion of the first groove 201 and the second groove 301 gradually moves to the left, and the width and height of the overlapping portion increase at the same time. Therefore, compared with the second groove 301 of the same width, the equivalent throttling area is linearly related to the square of the height of the valve core 3, as shown in FIG. Figure 8 As shown in the figure, more precise regulation of small flow can be achieved, and the maximum equivalent throttling area can be increased. A balance between fine regulation of small opening and rapid response of large opening can be achieved.

[0067] It should be noted that, in order to prevent the narrowest part of the first groove 201 and the starting point of the second groove 301 from deviating in vertical projection, the valve core 3 needs to be limited in this embodiment to prevent the valve core 3 from rotating in the circumferential direction.

[0068] In summary, the novel safety throttle valve described in the present invention can achieve stepless fine adjustment of the opening, which is superior to the traditional fixed gear adjustment method.

[0069] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above implementation is only to illustrate the technical concept and features of the present invention, and its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of safety throttle valve, characterized by: include: Valve body (1); A valve seat (2); the valve seat (2) is cylindrical, the upper and lower ports of the valve seat (2) are both sealedly connected to the valve body (1), and the L-shaped cavity in the valve body (1) is divided into an inlet cavity and an outlet cavity, the inner cylindrical surface of the valve seat (2) is provided with a first groove (201) along the circumferential direction, and the valve seat (2) is provided with a connecting hole (202), and the connecting hole (202) is connected from the bottom surface of the first groove (201) to the outer cylindrical surface of the valve seat (2); A valve core (3); the valve core (3) is sleeved in the valve seat (2) and is at least able to slide up and down relatively to each other; a second groove (301) is provided on the outer cylindrical surface of the valve core (3); the second groove (301) extends from a certain point on the outer cylindrical surface of the valve core (3) to the lower surface of the valve core (3), and the width of the second groove (301) gradually widens along its extension path; when the valve core (3) moves to the lowest position, the second groove (301) and the first groove (201) of the valve seat (2) are not connected; after the valve core (3) moves upward, the first groove (201) and the second groove (301) can be connected; Valve stem (4); the valve stem (4) and the valve core (3) are fixedly connected or integrally formed; Actuator (5); the movable shaft of the actuator (5) is connected to the valve stem (4); A displacement sensor (6); the displacement sensor (6) is connected to the movable shaft of the actuator (5).

2. A new safety throttle valve according to claim 1, characterized in that: The first grooves (201) are equidistant annular grooves.

3. A new safety throttle valve according to claim 2, characterized in that: The starting point of the second groove (301) is close to the upper end surface of the valve core (3), and extends vertically downward along the generatrix direction of the outer cylindrical surface of the valve core (3). The width of the second groove (301) is narrow at the top and wide at the bottom.

4. A new safety throttle valve according to claim 3, characterized in that: The second groove (301) is a spiral groove, and the width of the second groove (301) is narrow at the top and wide at the bottom along the spiral line.

5. A new safety throttle valve according to any one of claims 1 to 4, characterized in that: The number of the second grooves (301) is one or more.

6. A new safety throttle valve according to claim 1, characterized in that: The first groove (201) is a non-equidistant annular groove, and the narrowest part of the first groove (201) gradually widens along the circumferential direction and finally communicates with the narrowest part.

7. A new safety throttle valve according to claim 6, characterized in that: The second groove (301) is a spiral groove, and the width of the second groove (301) is narrow at the top and wide at the bottom along the spiral line.

8. A new safety throttle valve according to claim 6, characterized in that: The valve stem (4) is provided with a limiting mechanism for limiting the rotation of the valve core (3).

9. A new safety throttle valve according to claim 1, characterized in that: There are multiple connection holes (202).

10. A new safety throttle valve according to claim 9, characterized in that: The connection holes (202) are evenly distributed on the circumference.

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