Large flow pressure reducing valve and its use method

Abstract

The present invention relates to the field of engineering element technology, and specifically to the field of valve-related technology; the present invention provides a large-flow pressure reducing valve, a valve body, an inlet cavity and an outlet cavity are provided inside the valve body; a needle valve, which is lifted and arranged in the inlet cavity, and the needle valve is suitable for opening or closing the passage between the inlet cavity and the outlet cavity; a limit sealing assembly, which is vertically fixed inside the inlet cavity, and the needle valve is lifted and arranged inside the limit sealing assembly; wherein, the needle valve moves vertically downward to open the passage, and the medium flows to the outlet cavity after passing through the limit sealing assembly; when the needle valve moves downward to the maximum stroke, the needle valve pushes the limit piece of the limit sealing assembly to be vertically tightened downward, and the limit piece is suitable for supporting the outer wall of the limit sealing assembly from the inside; through the setting of the limit sealing assembly, the medium is prevented from directly impacting the needle valve, and when the needle valve moves downward to the maximum stroke, the limit piece supports the limit cylinder from the inside to prevent it from being pushed and deformed by the large-flow medium, thereby improving the service life of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering components, and in particular to the technical field of valves. Background Art

[0002] The pilot-operated pressure reducing valve can stabilize the pressure at the outlet of the valve body, so that the equipment behind the valve body can operate within the allowable pressure range; when working, the needle valve moves upward to open or close the valve body.

[0003] However, after the medium enters the valve body through the inlet, the needle valve will be subjected to radial force; the medium's long-term impact on the needle valve will cause the needle valve to loosen, resulting in reduced sealing between the needle valve and the valve body.

[0004] Therefore, how to prevent the needle valve from shaking due to the impact of the medium is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] The object of the present invention is to provide a large flow pressure reducing valve and a method for using the same.

[0006] In order to solve the above technical problems, the present invention provides a large flow pressure reducing valve, comprising:

[0007] A valve body, which has an inlet cavity and an outlet cavity formed therein;

[0008] A needle valve, which is arranged in the inlet chamber and is suitable for opening or closing the passage between the inlet chamber and the outlet chamber;

[0009] A limit seal assembly is vertically fixed inside the inlet cavity, and a needle valve is lifted and arranged inside the limit seal assembly;

[0010] The needle valve moves vertically downward to open the channel, and the medium flows to the outlet cavity after passing through the limit seal assembly;

[0011] The needle valve moves downward to a maximum stroke, and the needle valve pushes the limiting member of the limiting sealing assembly to be vertically tightened downward, and the limiting member is suitable for supporting the outer wall of the limiting sealing assembly from the inside.

[0012] Preferably, the position limiting sealing assembly comprises: a position limiting cylinder which is vertically fixed in the inlet cavity, and a filter screen is circumferentially arranged on the upper end of the outer wall of the position limiting cylinder;

[0013] The limiting member is telescopically arranged in the limiting cylinder, and the upper and lower ends of the limiting member are respectively fixed to the inner wall of the limiting cylinder and the outer wall of the needle valve.

[0014] Preferably, a plurality of limit blocks are fixed circumferentially to the outer wall of the needle valve, and the outer wall of the limit block abuts against the inner wall of the limit cylinder.

[0015] Preferably, the limiting block and the limiting member are staggered.

[0016] Preferably, a sealing ring is provided in the limiting cylinder, and the upper and lower surfaces of the sealing ring are respectively in contact with the limiting block and the limiting member;

[0017] When the needle valve moves downward, the limit block pulls the sealing ring to deform into an "S" shape.

[0018] Preferably, the limiting member comprises: a limiting ring, which is sleeved on the outer wall of the needle valve;

[0019] An extension plate is arranged along the axial direction of the needle valve, and the lower end of the extension plate is fixed on the limiting ring;

[0020] A fixed block, which is fixed to the inner wall of the limiting cylinder and is arranged below the sealing ring;

[0021] The telescopic member has upper and lower ends fixed on the extension plate and the fixing block respectively;

[0022] The needle valve moves downward to a maximum stroke, and the needle valve drives the limit ring to move downward, so that the telescopic member is in a stretched state.

[0023] Preferably, the inner bottom wall of the valve body is provided with a receiving groove, and the groove diameter of the receiving groove is not less than the outer diameter of the needle valve;

[0024] A return spring is fixed in the accommodating groove, the upper end of the return spring is fixed on the needle valve, and the return spring is suitable for pushing the needle valve to move upward.

[0025] Preferably, an adjusting cavity is provided at the upper end of the valve body, and an adjusting disk is provided in the adjusting cavity for lifting and lowering;

[0026] A linkage disk is provided under the adjusting disk for lifting, and the upper end of the needle valve is fixed on the linkage disk;

[0027] When the adjusting disk moves downward, it is suitable for driving the needle valve to move downward synchronously.

[0028] Preferably, a pilot valve is arranged outside the valve body, and two ends of the pilot valve are respectively connected to the inlet chamber and the regulating chamber.

[0029] Preferably, an isolation ring is fixed in the valve body, and the isolation ring is sleeved on the outer wall of the limiting cylinder.

[0030] On the other hand, the present invention also provides a method for using a large flow pressure reducing valve, comprising:

[0031] The needle valve moves vertically downward to open the valve body so that the inlet chamber and the outlet chamber are connected;

[0032] The limit seal assembly is sleeved on the outer wall of the needle valve, which prevents the medium from directly impacting the outer wall of the needle valve and reduces the risk of shaking of the needle valve caused by impact;

[0033] The needle valve moves downward to its maximum stroke, and the needle valve pushes the limit piece of the limit sealing assembly downward to be vertically tightened. The limit piece is suitable for supporting the outer wall of the limit sealing assembly from the inside, thereby preventing it from being pushed and deformed by a large flow medium, thereby increasing the service life of the equipment.

[0034] The beneficial effect of the present invention is that the large-flow pressure reducing valve of the present invention avoids direct impact of the medium on the needle valve by setting the limit sealing component. When the medium passes through the limit cylinder, the filter net can also filter out large particles of impurities in the medium. When the needle valve moves downward to the maximum stroke, the limit member supports the limit cylinder from the inside to avoid it being pushed and deformed by the large-flow medium, thereby improving the service life of the equipment.

[0035] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practicing the present invention.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 is a stereoscopic diagram of a preferred embodiment of a large flow pressure reducing valve of the present invention;

[0039] Figure 2 is a cutaway stereoscopic view of the valve body of the present invention from a first viewing angle;

[0040] Figure 3 is a cutaway stereoscopic view of the valve body of the present invention from a second viewing angle;

[0041] Figure 4 is a stereoscopic diagram of the needle valve and limit seal assembly of the present invention;

[0042] Figure 5 is a three-dimensional diagram of the position limiting sealing assembly of the present invention;

[0043] Figure 6 It is a schematic diagram of the limiter of the present invention in a stretched state.

[0044] In the figure:

[0045] 1. Valve body; 10. Return spring; 11. Adjustment chamber; 12. Adjustment disk; 13. Linkage disk; 14. Pilot valve;

[0046] 2. Enter the cavity; 3. Exit the cavity;

[0047] 4. Needle valve; 40. Limit block;

[0048] 5. Position limiting sealing assembly; 51. Position limiting cylinder; 52. Filter screen;

[0049] 53. Limiting member; 531. Limiting ring; 532. Extension plate; 533. Fixing block; 534. Telescopic member;

[0050] 54. Sealing ring. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0052] like Figures 1 to 6 As shown, at least one embodiment provides a large flow pressure reducing valve, wherein the medium flowing in the pressure reducing valve can be gas and liquid, and the pressure reducing valve comprises: a valve body 1, wherein an inlet chamber 2 and an outlet chamber 3 are opened inside the valve body 1; an inlet pipe and an outlet pipe are respectively arranged on both sides of the valve body 1, wherein the inlet pipe is connected to the inlet chamber 2; and the outlet pipe is connected to the outlet chamber 3. A needle valve 4 is arranged in the inlet chamber 2, and the needle valve 4 is suitable for opening or closing the passage between the inlet chamber 2 and the outlet chamber 3; the needle valve 4 moves upward to close the passage. The needle valve 4 moves downward to open the passage. A limit seal assembly 5 is vertically fixed inside the inlet chamber 2, and the needle valve 4 is arranged in the limit seal assembly 5; wherein the needle valve 4 moves vertically downward to open the passage, and the medium flows to the outlet chamber 3 after passing through the limit seal assembly 5; the needle valve 4 moves downward to the maximum stroke, and the needle valve 4 pushes the limit member 53 of the limit seal assembly 5 to be vertically tightened downward, and the limit member 53 is suitable for supporting the outer wall of the limit seal assembly 5 from the inside. By setting the limiting sealing assembly 5, the medium is prevented from directly impacting the needle valve 4. When the medium passes through the limiting cylinder 51, the filter screen 52 can also filter out large particles of impurities in the medium. When the needle valve 4 moves downward to the maximum stroke, the limiting member 53 supports the limiting cylinder 51 from the inside to prevent it from being pushed and deformed by the large flow medium, thereby improving the service life of the equipment.

[0053] Reference Figure 4The limiting seal assembly 5 comprises: a limiting cylinder 51, which is vertically fixed in the inlet cavity 2, and a filter screen 52 is circumferentially arranged on the upper end of the outer wall of the limiting cylinder 51; after the needle valve 4 moves downward to be located below the filter screen 52, the fluid in the inlet cavity 2 passes through the filter screen 52 and flows toward the outlet cavity 3, and the filter screen 52 is suitable for filtering and intercepting large particles of impurities in the fluid. A limiting member 53 is telescopically arranged in the limiting cylinder 51, and the upper and lower ends of the limiting member 53 are respectively fixed on the inner wall of the limiting cylinder 51 and the outer wall of the needle valve 4. When the needle valve 4 moves vertically downward to the maximum stroke, the needle valve 4 drives the limiting member 53 to extend downward until the limiting member 53 is stretched straight, and the limiting member 53 is suitable for supporting and fixing the limiting cylinder 51 from the inside. When the needle valve 4 moves downward to the maximum stroke, at this time, the opening of the needle valve 4 reaches the maximum, the flow rate and flow velocity of the fluid flowing through the valve body 1 reach the maximum, and the impact force of the fluid on the limiting cylinder 51 increases. Therefore, after each limiting member 53 is stretched straight, the side wall of the limiting member 53 abuts against the inner wall of the limiting tube 51, and the limiting member 53 supports the limiting tube 51 from the inside, which can enhance the radial impact resistance of the limiting tube 51 and improve the service life of the equipment.

[0054] Furthermore, a plurality of limit blocks 40 are fixed to the outer wall of the needle valve 4 in the circumferential direction, and the outer wall of the limit block 40 abuts against the inner wall of the limit tube 51. The limit block 40 and the limit member 53 are staggered.

[0055] In order to improve the sealing performance between the needle valve 4 and the limiting cylinder, a sealing ring 54 is provided in the limiting cylinder 51, and its upper and lower surfaces are respectively in contact with the limiting block 40 and the limiting member 53; wherein, when the needle valve 4 moves downward, the limiting block 40 pulls the sealing ring 54 to deform it, making it "S"-shaped. The traditional sealing ring 54 is directly fixed on the inner wall of the limiting cylinder 51, and the needle valve 4 moves vertically relative to the sealing ring 54. When the needle valve 4 moves vertically up and down relative to the sealing ring 54, the needle valve 4 hits and squeezes the sealing ring 54, which increases the wear of the sealing ring 54 and eventually causes the sealing performance of the sealing ring 54 to deteriorate. In some embodiments, the limiting block 40 and the limiting member 53 are respectively arranged above and below the sealing ring 54, and when the needle valve 4 moves vertically downward, the limiting block 40 pulls the sealing ring 54 to deform it downward. The limiting member 53 can support the limiting sealing ring 54 from below. Therefore, when the needle valve 4 moves vertically downward, the sealing ring 54 is stretched into an "S" shape in the axial direction by the stopper block 40 and the stopper 53, and the outer diameter of the sealing ring 54 becomes smaller. Therefore, in the process of the needle valve 4 moving vertically upward, the sealing ring 54 is gradually reset until the inner ring of the sealing ring 54 abuts against the outer wall of the needle valve 4. Through such an arrangement, the squeezing force and impact force on the sealing ring 54 when the needle valve 4 moves vertically are minimized, thereby improving the service life of the equipment.

[0056] Reference Figure 5The limiting member 53 includes: a limiting ring 531, which is sleeved on the outer wall of the needle valve 4; a ring groove is provided on the middle outer wall of the needle valve 4, and the limiting ring 531 is fixed in the ring groove. When the needle valve 4 moves vertically up and down, the outer ring of the limiting ring 531 will not contact the inner wall of the limiting cylinder 51. An extension plate 532 is arranged along the axial direction of the needle valve 4, and the lower end of the extension plate 532 is fixed on the limiting ring 531; the extension plate 532 is in an arc shape, and the outer wall of the extension plate 532 is adapted to the inner wall of the limiting cylinder 51; a fixing block 533, which is fixed on the inner wall of the limiting cylinder 51 and is arranged below the sealing ring 54; the fixing block 533 is suitable for supporting and fixing the sealing ring 54 from below. A telescopic member 534, whose upper and lower ends are respectively fixed on the extension plate 532 and the fixing block 533; wherein, when the needle valve 4 moves downward to the maximum stroke, the needle valve 4 drives the limiting ring 531 to move downward, so that the telescopic member 534 is in a stretched state. After the telescopic member 534 is stretched straight, the outer walls of the telescopic member 534 and the extension plate 532 are in contact with the inner wall of the limiting cylinder 51 to increase the radial impact resistance of the limiting cylinder 51 and improve the service life of the equipment.

[0057] Reference Figure 2 The bottom wall of the valve body 1 is provided with a receiving groove, and the groove diameter of the receiving groove is not less than the outer diameter of the needle valve 4; the needle valve 4 is arranged in the receiving groove for lifting. A return spring 10 is fixed in the receiving groove, and the upper end of the return spring 10 is fixed on the needle valve 4. The return spring 10 is suitable for pushing the needle valve 4 to move upward. The needle valve 4 moves downward, squeezing the return spring 10 to compress and deform. After the medium in the inlet chamber 2 is gradually reduced, the return spring 10 pushes the needle valve 4 to move upward to close the valve body 1.

[0058] Reference Figure 3 , the upper end of the valve body 1 is provided with an adjusting chamber 11, and an adjusting disk 12 is provided in the adjusting chamber 11 for lifting; the fluid is suitable for flowing into the adjusting chamber 11, and when the fluid in the adjusting chamber 11 increases, the fluid pushes the adjusting disk 12 to move downward. A linkage disk 13 is provided under the adjusting disk 12 for lifting, and the linkage disk 13 abuts against the adjusting disk 12; the upper end of the needle valve 4 is fixed on the linkage disk 13; wherein, when the adjusting disk 12 moves downward, it is suitable for driving the needle valve 4 to move downward synchronously. A pilot valve 14 is provided on the outer side of the valve body 1, and the two ends of the pilot valve 14 are respectively connected with the inlet chamber 2 and the adjusting chamber 11. The medium in the inlet chamber 2 flows into the adjusting chamber 11 through the pilot valve 14, and as the pressure increases, the fluid in the adjusting chamber 11 pushes the adjusting disk 12 to move downward, and the adjusting disk 12 drives the needle valve 4 to move downward synchronously, so that the valve body 1 is opened. An isolation ring is fixed in the valve body 1, and the isolation ring is sleeved on the outer wall of the limit cylinder 51. The isolation ring has the effect of isolating the inlet cavity 2 and the outlet cavity 3. At the same time, the isolation ring fixes and limits the limiting cylinder 51 from the upper end.

[0059] In some embodiments, the present invention further provides a method for using a large flow pressure reducing valve, comprising:

[0060] The needle valve 4 moves vertically downward to open the valve body 1 so that the inlet chamber 2 and the outlet chamber 3 are connected;

[0061] The limit seal assembly 5 is sleeved on the outer wall of the needle valve 4, which prevents the medium from directly impacting the outer wall of the needle valve 4 and reduces the risk of shaking of the needle valve 4 caused by the impact;

[0062] The needle valve 4 moves downward to the maximum stroke, and the needle valve 4 pushes the limit member 53 of the limit sealing assembly 5 to be vertically tightened downward. The limit member 53 is suitable for supporting the outer wall of the limit sealing assembly 5 from the inside, thereby preventing it from being pushed and deformed by a large flow medium, thereby increasing the service life of the equipment.

[0063] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0064] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "flat", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0066] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A large flow pressure reducing valve, characterized in that: include: A valve body (1) is provided with an inlet cavity (2) and an outlet cavity (3) therein; A needle valve (4) which is arranged in a lifting manner in the inlet chamber (2), and the needle valve (4) is suitable for opening or closing the passage between the inlet chamber (2) and the outlet chamber (3); A limit seal assembly (5) is vertically fixed inside the inlet chamber (2), and a needle valve (4) is lifted and arranged inside the limit seal assembly (5); The needle valve (4) moves vertically downward to open the channel, and the medium passes through the limit seal assembly (5) and flows to the outlet chamber (3); The needle valve (4) moves downward to a maximum stroke, and the needle valve (4) pushes the limiting member (53) of the limiting sealing assembly (5) to be vertically tightened downward, wherein the limiting member (53) is suitable for supporting the outer wall of the limiting sealing assembly (5) from the inside; The limiting seal assembly (5) comprises: a limiting cylinder (51) which is vertically fixed in the inlet cavity (2), and a filter screen (52) is circumferentially arranged on the upper end of the outer wall of the limiting cylinder (51); The limiting member (53) is telescopically arranged in the limiting cylinder (51), and the upper and lower ends of the limiting member (53) are respectively fixed to the inner wall of the limiting cylinder (51) and the outer wall of the needle valve (4).

2. The large flow pressure reducing valve according to claim 1, characterized in that: A plurality of limit blocks (40) are fixed circumferentially to the outer wall of the needle valve (4), and the outer wall of the limit block (40) abuts against the inner wall of the limit cylinder (51).

3. The large flow pressure reducing valve according to claim 2, characterized in that: The limiting block (40) and the limiting member (53) are arranged in a staggered manner.

4. The large flow pressure reducing valve according to claim 3, characterized in that: A sealing ring (54) is arranged in the limiting cylinder (51), and the upper and lower surfaces of the sealing ring are respectively in contact with the limiting block (40) and the limiting member (53); When the needle valve (4) moves downward, the limit block (40) pulls the sealing ring (54) to deform so that it assumes an "S" shape.

5. The large flow pressure reducing valve according to claim 4, characterized in that: The limiting member (53) comprises: a limiting ring (531) which is sleeved on the outer wall of the needle valve (4); An extension plate (532) is arranged along the axial direction of the needle valve (4), and the lower end of the extension plate (532) is fixed on the limiting ring (531); A fixed block (533), which is fixed to the inner wall of the limiting cylinder (51) and is arranged below the sealing ring (54); A telescopic member (534), the upper and lower ends of which are respectively fixed on the extension plate (532) and the fixing block (533); The needle valve (4) moves downward to a maximum stroke, and the needle valve (4) drives the limit ring (531) to move downward, so that the telescopic member (534) is in a stretched state.

6. The large flow pressure reducing valve according to claim 5, characterized in that: The inner bottom wall of the valve body (1) is provided with a receiving groove, and the groove diameter of the receiving groove is not less than the outer diameter of the needle valve (4); A return spring (10) is fixed in the receiving groove, the upper end of the return spring (10) is fixed on the needle valve (4), and the return spring (10) is suitable for pushing the needle valve (4) to move upward.

7. The large flow pressure reducing valve according to claim 6, characterized in that: An adjusting chamber (11) is provided at the upper end of the valve body (1), and an adjusting disk (12) is arranged in a lifting manner in the adjusting chamber (11); A linkage disk (13) is provided below the regulating disk (12) for lifting and lowering, and the upper end of the needle valve (4) is fixed on the linkage disk (13); When the regulating disk (12) moves downward, it is suitable for driving the needle valve (4) to move downward synchronously.

8. The large flow pressure reducing valve according to claim 7, characterized in that: A pilot valve (14) is arranged outside the valve body (1), and two ends of the pilot valve (14) are respectively connected to the inlet chamber (2) and the regulating chamber (11).

9. The large flow pressure reducing valve according to claim 8, characterized in that: An isolation ring is fixed inside the valve body (1), and the isolation ring is sleeved on the outer wall of the limiting cylinder (51).

10. A method for using the large flow pressure reducing valve according to claim 9, characterized in that: include: The needle valve (4) moves vertically downward to open the valve body (1), so that the inlet chamber (2) and the outlet chamber (3) are connected; The limit seal assembly (5) is sleeved on the outer wall of the needle valve (4), thereby preventing the medium from directly impacting the outer wall of the needle valve (4) and reducing the risk of shaking of the needle valve (4) due to the impact; The needle valve (4) moves downward to a maximum stroke, and the needle valve (4) pushes the limiting member (53) of the limiting sealing assembly (5) to be vertically tightened downward, wherein the limiting member (53) is suitable for supporting the outer wall of the limiting sealing assembly (5) from the inside, thereby preventing the limiting member from being pushed and deformed by a large flow medium, thereby increasing the service life of the equipment.

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