Differential pressure type double-valve-clack lever floating ball assembly and floating ball drain valve

Abstract

The invention relates to a differential pressure type double-valve-clack lever floating ball assembly and a floating ball drain valve, the floating ball assembly comprises a main valve seat, a main valve clack, a pilot valve seat, a pilot valve core, a floating ball and a floating ball seat, and the main valve seat is provided with a through discharge orifice; the main valve clack is located at one end of the main valve seat and is hollow, and a through hole is formed in the end, close to the discharging hole opening, of the main valve clack. The pilot valve seat is fixedly mounted at the through hole, a through discharge channel is formed in the pilot valve seat, and a plurality of through small holes are uniformly formed in one end of the pilot valve seat at intervals; the pilot valve element penetrates through the other end of the main valve clack, and one end of the pilot valve element extends into the other end of the pilot valve seat and is attached to the discharging channel in a sliding mode. The floating ball seat is fixedly mounted on the right side of the main valve seat; the end, connected with the main valve seat, of the floating ball connecting rod is rotationally connected with the other end of the pilot valve element through a connecting assembly. The double valve elements are adopted, large pressure difference can be solved in advance, and therefore the large valve element can be opened with small acting force.

Description

Technical Field

[0001] The invention relates to the technical field of float traps, and in particular to a differential pressure double-valve flap lever float assembly and a float trap. Background Art

[0002] Steam traps are also called automatic drains or condensate drains. They are divided into steam system and gas system types. Steam traps are installed at the end of the steam-heated pipeline to continuously discharge the condensate in the steam-heated pipeline to the outside of the pipeline.

[0003] The float trap is a relatively complex large-displacement trap. The ones on the market are generally single-spool direct-displacement ones, with direct action without buffering and limited displacement. Without buffering, it is easy to cause hard contact damage between the valve core and the valve seat, and the service life is worrying. In addition, for large discharge holes, because the opening force is correspondingly increased, the size and weight of the float mechanism must be increased and strengthened accordingly, and the space size and weight of the entire valve body are also synchronously enlarged, which is not conducive to cost control and installation access. Summary of the invention

[0004] The invention provides a differential pressure double valve flap lever float assembly and a float steam trap, aiming to solve the problems in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A differential pressure double valve flap lever float assembly, comprising a main valve seat, a main valve flap, a pilot valve seat, a pilot valve core, a float and a float seat, wherein the main valve seat is provided with a through discharge orifice; the main valve flap is located at one end of the main valve seat, the interior of which is hollow and the end close to the discharge orifice is provided with a through hole; the pilot valve seat is fixedly mounted at the through hole, the interior of which is provided with a through discharge passage, and the end of the pilot valve seat located in the main valve flap is provided with a plurality of through small holes evenly spaced apart; the pilot valve core passes through the other end of the main valve flap, and one end of the pilot valve core extends into the other end of the pilot valve seat and slides in contact with the discharge passage;

[0007] The float seat is fixedly installed on the right side of the main valve seat; the float is rotatably connected to the float seat up and down through a float connecting rod, and one end of the float connecting rod connected to the main valve seat is rotatably connected to the other end of the pilot valve core through a connecting assembly.

[0008] The beneficial effect of the present invention is that when the condensed water level inside the steam trap rises to a certain position, the buoyancy of the float overcomes its gravity and floats up, and the buoyancy moment acts on the pilot valve core through the connecting component, driving it to move away from the pilot valve seat, thereby opening the pilot valve first.

[0009] At this time, the pressure P2 in the main valve disc inside the pilot valve will be equal to the pressure P3 at the steam trap outlet, and a pressure difference will be generated with the pressure P1 inside the steam trap. This pressure difference will compress the variable pressure chamber and drive the main valve disc to move away from the valve seat discharge orifice, opening the main valve to discharge condensate.

[0010] The advantage of the lever float mechanism with this differential pressure double disc structure is that a larger main valve can be opened by relying on the action of the pilot valve, so that it can have a very large drainage capacity and is suitable for draining large amounts of condensate in pipelines.

[0011] When the condensate level inside the steam trap is too low and the buoyancy of the float cannot overcome its gravity and float up, the gravity torque of the lever mechanism will act on the pilot valve core through the connecting assembly and drive it to move toward the pilot valve seat. The two will first contact and close the pilot valve.

[0012] At this time, the pressure P1 inside the steam trap is equal to the pressure P2 inside the pilot valve caused by the main valve disc. There is no pressure difference between the two, so the variable pressure chamber cannot be compressed.

[0013] The pilot valve core will continue to drive the main valve disc to move toward the discharge orifice on the valve seat, and make its functional surface contact and seal with the discharge orifice on the main valve seat to close the main valve; at this time, both the pilot valve and the main valve are closed, thereby preventing steam leakage.

[0014] The present invention adopts a double valve core, which can solve the large pressure difference in advance, thereby realizing opening the large valve core with a small force.

[0015] Based on the above technical solution, the present invention can also be improved as follows.

[0016] Furthermore, it also includes a pilot valve bellows, which is fixedly sleeved outside the main valve disc, and the other end of the pilot valve core passes through the pilot valve bellows; the other end of the main valve disc is open and fits against the inner wall of the pilot valve bellows.

[0017] The beneficial effect of adopting the above further scheme is simple structure and reasonable design. The pilot valve bellows and the main valve disc form a closed cavity. At this time, the pressure P2 in the pilot valve caused by the main valve disc will be equal to the pressure P3 at the outlet of the steam trap, and a pressure difference will be generated with the pressure P1 inside the steam trap. The pressure difference will compress the variable pressure chamber and drive the main valve disc to move away from the valve seat discharge orifice, so as to open the main valve to discharge condensed water.

[0018] Furthermore, it also includes a pilot valve cylinder, which is sleeved outside the pilot valve bellows.

[0019] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing the pilot valve cylinder to protect the pilot valve bellows.

[0020] Furthermore, the connecting assembly includes two float levers, which are symmetrically distributed on both sides of the float seat. One end of the float lever is rotatably connected to the corresponding end of the float connecting rod through a pin shaft, and the other end is rotatably connected to both ends of the connecting shaft. The connecting shaft is threadedly connected to the corresponding end of the guide valve core and can move back and forth along the preset opening groove on the float seat.

[0021] The beneficial effects of adopting the above further solution are simple structure and reasonable design. During the process of the float ball floating up and down, the float ball connecting rod cooperates with two float ball levers to drive the valve core of the pilot valve to move.

[0022] Furthermore, a compression spring seat is fixedly provided on the portion of the pilot valve core located inside the main valve disc, and a compression spring is provided on the portion of the pilot valve core located inside the main valve disc, and two ends of the compression spring are respectively abutted against the compression spring seat and the corresponding ends of the main valve disc.

[0023] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and the pilot valve core can be returned by using a compression spring, which is convenient to use.

[0024] The present invention also relates to a float steam trap, comprising a valve body and a valve cover, and also comprising the differential pressure type double valve flap lever float assembly as described above, wherein the valve body is provided with an inlet and an outlet; the valve cover is fixedly mounted on the valve body, and the main valve seat, the main valve flap and the float are respectively mounted in the valve cover; the inlet is connected to the cavity inside the valve cover, and the discharge orifice is connected to the outlet.

[0025] The beneficial effects of adopting the above further solution are simple structure, reasonable design, using the valve body and the valve cover to form a mounting carrier, and facilitating the introduction of steam and the discharge of condensed water.

[0026] Furthermore, a guide seat is fixedly installed between the outlet and the discharge orifice, the interior of the guide seat is hollow and the two ends are open, and the two ends of the guide seat are respectively connected with the outlet and the discharge orifice; the guide seat is provided with an exhaust passage running through the inside and outside, and an exhaust component is installed at one end of the exhaust passage.

[0027] The beneficial effects of adopting the above further solution are simple structure and reasonable design. On the one hand, the guide seat can be used to guide the discharge of condensed water, and on the other hand, the exhaust component can be used to exhaust the air.

[0028] Furthermore, a filter screen is fixedly installed at the inlet.

[0029] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and the use of the filter net to filter out impurities in the steam to ensure the overall working performance of the steam trap.

[0030] Furthermore, the valve cover is evenly spaced apart with a plurality of mounting holes penetrating inside and outside, and plugs are respectively installed at the plurality of mounting holes.

[0031] The beneficial effect of adopting the above further solution is that an interface for external detection device accessories is reserved.

[0032] Furthermore, an observation hole is provided at one end of the valve cover away from the valve body, and a sight glass is fixedly installed at the observation hole.

[0033] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and the use of a sight glass makes it easy for operators to observe the internal conditions of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is one of the structural schematic diagrams of the double valve flap lever float assembly in the present invention;

[0035] Figure 2 This is the second structural schematic diagram of the double valve flap lever float assembly in the present invention;

[0036] Figure 3 It is an exploded view of the double valve flap lever float assembly in the present invention;

[0037] Figure 4 It is a schematic diagram of the structure of the double valve flap lever float assembly in the present invention when it is in an open state;

[0038] Figure 5 It is a schematic diagram of the structure of the double valve flap lever float assembly in the present invention when it is in a closed state;

[0039] Figure 6 It is a structural schematic diagram of the pilot valve seat in the present invention;

[0040] Figure 7 This is one of the structural schematic diagrams of the float trap in the present invention;

[0041] Figure 8 This is the second structural schematic diagram of the float trap in the present invention;

[0042] Fig. 9 This is the third structural schematic diagram of the float trap in the present invention;

[0043] Fig.10 It is a schematic diagram of the internal structure of the float trap in the present invention;

[0044] Fig.11 It is an exploded view of the float trap in the present invention.

[0045] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0046] 1. Float seat; 2. Float connecting rod; 3. Connecting shaft; 4. Float; 5. Compression spring seat; 6. Pilot valve core; 7. Pilot valve seat; 8. Compression spring; 9. Main valve disc; 10. Pilot valve cylinder; 11. Pilot valve bellows; 12. Float lever; 13. Pin shaft; 14. Bushing; 15. Main valve seat; 16. Valve body; 17. Valve cover; 18. Inlet; 19. Outlet; 20. Discharge orifice; 21. Small hole; 22. Guide seat; 23. Exhaust assembly; 24. Filter; 25. Plug; 26. Sight glass; 27. Lock nut; 28. Connecting flange; 29. ​​Gasket; 30. Pressure cover; 31. Valve seat gasket; 32. Valve body gasket; 33. Sight glass gasket. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0049] In the description of the present invention, it should be noted that, 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 it can be indirectly connected 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 by specific circumstances.

[0050] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0051] Example 1

[0052] like Figures 1 to 6As shown, this embodiment provides a differential pressure type double valve disc lever float assembly, including a main valve seat 15, a main valve disc 9, a pilot valve seat 7, a pilot valve core 6, a float 4 and a float seat 1, wherein the main valve seat 15 is provided with a through discharge orifice 20; the main valve disc 9 is located at one end of the main valve seat 15, and its interior is hollow and its end close to the discharge orifice 20 is provided with a through hole; the pilot valve seat 7 is fixedly installed at the through hole, and a through discharge channel is provided therein, and a plurality of through small holes 21 are evenly spaced at one end of the pilot valve seat 7 located in the main valve disc 9; the pilot valve core 6 penetrates the other end of the main valve disc 9, and one end thereof extends into the other end of the pilot valve seat 7 and slides in contact with the discharge channel;

[0053] The float seat 1 is fixedly installed on the right side of the main valve seat 15; the float 4 is connected to the float seat 1 for vertical rotation via the float connecting rod 2, and one end of the float connecting rod 2 connected to the main valve seat 15 is connected to the other end of the pilot valve core 6 for rotation via a connecting assembly.

[0054] When the condensate level inside the steam trap rises to a certain position, the buoyancy of the float 4 overcomes its gravity and floats up. The buoyancy moment acts on the pilot valve core 6 through the connecting assembly and drives it to move away from the pilot valve seat 7, thus opening the pilot valve first.

[0055] At this time, the pressure P2 in the main valve disc 9 inside the pilot valve will be equal to the pressure P3 at the steam trap outlet, and a pressure difference will be generated with the pressure P1 inside the steam trap. This pressure difference will compress the variable pressure chamber and drive the main valve disc 9 to move away from the valve seat discharge orifice 20, opening the main valve to discharge condensate.

[0056] The advantage of the lever float mechanism with this differential pressure double disc structure is that a larger main valve can be opened by relying on the action of the pilot valve, so that it can have a very large drainage capacity and is suitable for draining large amounts of condensate in pipelines.

[0057] When the condensate level inside the steam trap is too low and the buoyancy of the float 4 cannot overcome its gravity and float up, the gravity torque of the lever mechanism will act on the pilot valve core 6 through the connecting assembly and drive it to move toward the pilot valve seat 7. The two will first contact and close the pilot valve.

[0058] At this time, the pressure P1 inside the steam trap is equal to the pressure P2 inside the pilot valve by the main valve disc 9, and there is no pressure difference between the two, so the variable pressure chamber cannot be compressed.

[0059] The pilot valve core 6 will continue to drive the main valve disc 9 to move toward the discharge orifice 20 on the valve seat, and make its functional surface contact and fit tightly with the discharge orifice on the main valve seat to close the main valve; at this time, since both the pilot valve and the main valve are closed, steam leakage is prevented.

[0060] Preferably, in this embodiment, the float connecting rod 2 is preferably a rectangular frame structure.

[0061] Preferably, in this embodiment, the main valve seat 15 adopts an independent single body structure to adapt to different pipeline pressure differences and discharge volume requirements.

[0062] In addition, one end of the float connecting rod 2 is rotatably connected to the float seat 1 through a rotating shaft, and both ends of the rotating shaft are respectively sleeved with shaft sleeves 14.

[0063] This embodiment adopts a double valve core, which can solve the large pressure difference in advance, thereby achieving the goal of opening the large valve core with a small force.

[0064] Example 2

[0065] Based on Example 1, this embodiment also includes a pilot valve bellows 11, which is fixedly mounted outside the main valve flap 9, and the other end of the pilot valve core 6 passes through the pilot valve bellows 11; the other end of the main valve flap 9 is open and fits against the inner wall of the pilot valve bellows 11.

[0066] This solution has a simple structure and a reasonable design. The pilot valve bellows 11 and the main valve disc 9 are used to form a closed cavity. At this time, the pressure P2 in the cavity formed by the main valve disc 9 and the pilot valve bellows 11 inside the pilot valve will be equal to the pressure P3 at the outlet of the steam trap, and a pressure difference will be generated with the pressure P1 inside the steam trap. The pressure difference will compress the variable pressure chamber and drive the main valve disc 9 to move away from the valve seat discharge orifice 20, so as to open the main valve to discharge condensed water.

[0067] Preferably, in this embodiment, the main valve flap 9 and the pilot valve bellows 11 are respectively cylindrical structures.

[0068] In addition, one end of the pilot valve bellows 11 is open and sleeved outside the main valve flap 9 , and one end of the pilot valve bellows 11 is threadedly connected to one end of the main valve flap 9 .

[0069] Example 3

[0070] On the basis of Embodiment 2, this embodiment further includes a pilot valve cylinder 10 , and the pilot valve cylinder 10 is sleeved outside the pilot valve bellows 11 .

[0071] This solution has a simple structure and a reasonable design, and utilizes the pilot valve cylinder 10 to protect the pilot valve bellows 11 .

[0072] Preferably, in this embodiment, the special structure of the pilot valve bellows 11 provides a retractable space, so that the pressure-changing chamber can change its shape as the internal and external pressures change.

[0073] In addition, the pilot valve cylinder 10 is cylindrical in structure, one end of which is bent inward, and the open end of the pilot valve bellows 11 and one end of the main valve disc 9 clamp the bent end of the pilot valve cylinder 10 to ensure the stability of the assembly of the pilot valve cylinder 10.

[0074] Example 4

[0075] On the basis of any one of Embodiments 2 to 3, in this embodiment, the connection assembly includes two float levers 12, which are symmetrically distributed on both sides of the float seat 1, one end of which is rotatably connected to the corresponding end of the float connecting rod 2 through a pin 13, and the other end is rotatably connected to the two ends of the connecting shaft 3, and the connecting shaft 3 is threadedly connected to the corresponding end of the pilot valve core 6, and can move forward and backward along the preset opening groove on the float seat 1. This solution has a simple structure and a reasonable design. The float connecting rod 2 cooperates with the two float levers 12 to drive the pilot valve core 6 to move during the floating process of the float 4.

[0076] Preferably, in this embodiment, the two float levers 12 are preferably long strip plate structures.

[0077] Based on the above scheme, the connecting shaft 3 passes through the corresponding end of the pilot valve bellows 11, and the other end of the pilot valve core 6 passes through the connecting shaft 3 and the corresponding end of the pilot valve bellows 11. A locking nut 27 is threadedly sleeved on the other end of the pilot valve core 6 for easy assembly.

[0078] In addition, the float 4 and the float connecting rod 2 are assembled on the float seat 1 as an integral structure, so that the float 4 can rotate around the axis of the installation position of the float seat 1; another connecting component connects the float connecting rod 2 to the end of the pilot valve core 6 away from the pilot valve seat 7, so that when the float 4 rotates up and down, it can drive the pilot valve core 6 to move forward and backward, thereby realizing the opening and closing of the pilot valve.

[0079] Example 5

[0080] On the basis of the above embodiments, in this embodiment, a compression spring seat 5 is fixedly provided on the portion of the pilot valve core 6 located inside the main valve flap 9, and a compression spring 8 is provided on the portion of the pilot valve core 6 located inside the main valve flap 9, and both ends of the compression spring 8 are respectively abutted against the compression spring seat 5 and the corresponding ends of the main valve flap 9.

[0081] This solution has a simple structure and a reasonable design. The compression spring 8 can be used to return the pilot valve core 6, and the solution is easy to use.

[0082] Preferably, in this embodiment, one end of the compression spring is sleeved outside the corresponding end of the pilot valve seat 7 .

[0083] Example 6

[0084] Based on the above embodiments, Figures 7 to 11As shown, this embodiment also provides a float steam trap, including a valve body 16 and a valve cover 17, and also includes the differential pressure type double valve flap lever float assembly as described above, the valve body 16 is provided with an inlet 18 and an outlet 19; the valve cover 17 is fixedly installed on the valve body 16, the main valve seat 15, the main valve flap 9 and the float 4 are respectively installed in the valve cover 17; the inlet 18 is connected to the cavity inside the valve cover 17, and the discharge orifice 20 is connected to the outlet 19.

[0085] This solution has a simple structure and a reasonable design. The valve body 16 and the valve cover 17 are used to form a mounting carrier, and it is convenient to send in steam and send out condensed water.

[0086] Preferably, in this embodiment, connection flanges 28 are fixedly mounted on the valve body 16 at locations corresponding to the inlet 18 and the outlet 19 .

[0087] Preferably, in this embodiment, a valve body sealing gasket 32 ​​is installed between the valve body 16 and the valve cover 17 .

[0088] Example 7

[0089] On the basis of Example 6, in this embodiment, a guide seat 22 is fixedly installed between the outlet 19 and the discharge orifice 20, the interior of the guide seat 22 is hollow and the two ends are open, and the two ends of the guide seat 22 are respectively connected to the outlet 19 and the discharge orifice 20; the guide seat 22 is provided with an exhaust passage running through the inside and outside, and an exhaust component 23 is installed at one end of the exhaust passage.

[0090] This solution has a simple structure and a reasonable design. On the one hand, the guide seat 22 can be used to guide the discharge of condensed water, and on the other hand, the exhaust component can be used to exhaust the air.

[0091] Preferably, in this embodiment, the guide seat 22 is preferably an arc-shaped structure for easy assembly.

[0092] Preferably, in this embodiment, a valve seat sealing gasket 31 is installed between the corresponding end of the flow guide seat 22 and the corresponding end of the main valve seat 15 .

[0093] In addition, the float seat 1 is connected to the guide seat 22 via bolts.

[0094] It should be noted that the above-mentioned exhaust component adopts a thermostatic valve in the prior art. For the specific structure, please refer to the Chinese patent with announcement number CN117662963A, which is a thermostatic diaphragm box and steam trap with a two-stage valve core structure. Therefore, the specific structure of the above-mentioned exhaust component will not be repeated here.

[0095] Example 8

[0096] On the basis of any one of Embodiments 6 to 7, in this embodiment, a filter screen 24 is fixedly installed at the inlet 18 .

[0097] This solution has a simple structure and a reasonable design. The filter screen 24 can be used to filter out impurities in the steam, thereby ensuring the overall working performance of the steam trap.

[0098] Example 9

[0099] On the basis of any one of Embodiments 6 to 8, in this embodiment, the valve cover 17 is evenly spaced to have a plurality of mounting holes penetrating inside and outside, and plugs 25 are respectively installed at the plurality of mounting holes.

[0100] This solution reserves an interface for external detection device accessories. Preferably, in this embodiment, the plurality of plugs 25 are respectively threadedly connected to the plurality of mounting holes, and washers 29 are respectively installed between the corresponding ends of the plurality of plugs 25 and the valve cover 17 .

[0101] Example 10

[0102] On the basis of any one of Embodiments 6 to 9, in this embodiment, an observation hole is provided at one end of the valve cover 17 away from the valve body 16, and a sight glass 26 is fixedly installed at the observation hole.

[0103] This solution has a simple structure and a reasonable design, and the sight glass 26 is used to facilitate operators to observe the internal conditions of the valve.

[0104] Preferably, in this embodiment, the corresponding end of the valve cover 17 is connected with a pressure cover 30 by bolts, and the pressure cover 30 presses the sight glass 26 tightly to ensure the stability of the assembly of the sight glass 26 and facilitate disassembly.

[0105] Preferably, in this embodiment, sight glass sealing gaskets 33 are installed between the sight glass 26 and the pressure cover 30 and between the sight glass 26 and the valve cover 17 respectively.

[0106] The working principle of the present invention is as follows:

[0107] When the condensate level inside the steam trap rises to a certain position, the buoyancy of the float 4 overcomes its gravity and floats up. The buoyancy moment acts on the pilot valve core 6 through the connecting assembly and drives it to move away from the pilot valve seat 7, thus opening the pilot valve first.

[0108] At this time, the pressure P2 in the variable pressure chamber formed by the main valve disc 9 and the pilot valve bellows 11 inside the pilot valve will be equal to the pressure P3 at the outlet of the steam trap, and a pressure difference will be generated with the pressure P1 inside the steam trap. This pressure difference will compress the variable pressure chamber and drive the main valve disc 9 to move away from the valve seat discharge orifice 20, opening the main valve to discharge condensate.

[0109] The advantage of the lever float mechanism with this differential pressure double disc structure is that a larger main valve can be opened by relying on the action of the pilot valve, so that it can have a very large drainage capacity and is suitable for draining large amounts of condensate in pipelines.

[0110] When the condensate level inside the steam trap is too low and the buoyancy of the float 4 cannot overcome its gravity and float up, the gravity torque of the lever mechanism will act on the pilot valve core 6 through the connecting assembly and drive it to move toward the pilot valve seat 7. The two will first contact and close the pilot valve.

[0111] At this time, the pressure P1 inside the steam trap is equal to the pressure P2 in the variable pressure chamber formed by the main valve disc 9 and the pilot valve bellows 11 inside the pilot valve. There is no pressure difference between the two, so the variable pressure chamber cannot be compressed.

[0112] The pilot valve core 6 will continue to drive the main valve disc 9 to move toward the discharge orifice 20 on the valve seat, and make its functional surface contact and fit tightly with the discharge orifice on the main valve seat to close the main valve; at this time, since both the pilot valve and the main valve are closed, steam leakage is prevented.

[0113] It should be noted that the attached Fig.10 The arc arrow in the figure only indicates the floating direction of the float 4 and has no other substantial meaning.

[0114] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0115] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0116] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A differential pressure double valve flap lever float assembly, characterized in that: It comprises a main valve seat (15), a main valve flap (9), a pilot valve seat (7), a pilot valve core (6), a float (4) and a float seat (1); the main valve seat (15) is provided with a through discharge orifice (20); the main valve flap (9) is located at one end of the main valve seat (15), its interior is hollow and its end close to the discharge orifice (20) is provided with a through hole; the pilot valve seat (7) is fixedly installed at the through hole, and a through discharge channel is provided inside the pilot valve seat (7); one end of the pilot valve seat (7) located inside the main valve flap (9) is provided with a plurality of through small holes (21) at even intervals; the pilot valve core (6) penetrates the other end of the main valve flap (9), and one end of the pilot valve core (6) extends into the other end of the pilot valve seat (7) and slides in contact with the discharge channel; The float seat (1) is fixedly mounted on the right side of the main valve seat (15); the float (4) is rotatably connected to the float seat (1) via a float connecting rod (2); one end of the float connecting rod (2) connected to the main valve seat (15) is rotatably connected to the other end of the pilot valve core (6) via a connecting assembly.

2. The differential pressure double valve flap lever float assembly according to claim 1, characterized in that: It also includes a pilot valve bellows (11), which is fixedly sleeved outside the main valve flap (9), and the other end of the pilot valve core (6) passes through the pilot valve bellows (11); the other end of the main valve flap (9) is open and fits against the inner wall of the pilot valve bellows (11).

3. The differential pressure double valve flap lever float assembly according to claim 2 is characterized in that: It also comprises a pilot valve cylinder (10), wherein the pilot valve cylinder (10) is sleeved outside the pilot valve bellows (11).

4. The differential pressure double valve flap lever float assembly according to claim 2, characterized in that: The connecting assembly comprises two float levers (12), which are symmetrically distributed on both sides of the float seat (1), one end of which is rotatably connected to the corresponding end of the float connecting rod (2) through a pin shaft (13), and the other end is rotatably connected to the two ends of a connecting shaft (3), and the connecting shaft (3) is threadedly connected to the corresponding end of the pilot valve core (6), and can move forward and backward along a preset opening groove on the float seat (1).

5. The differential pressure double valve flap lever float assembly according to any one of claims 1 to 4, characterized in that: A compression spring seat (5) is fixedly provided at a position of the pilot valve core (6) located inside the main valve flap (9), and a compression spring (8) is provided at a position of the pilot valve core (6) located inside the main valve flap (9), with two ends of the compression spring (8) respectively abutting against corresponding ends of the compression spring seat (5) and the main valve flap (9).

6. A float trap, comprising a valve body (16) and a valve cover (17), characterized in that: It also includes a differential pressure double valve flap lever float assembly as described in any one of claims 1 to 5, wherein the valve body (16) is provided with an inlet (18) and an outlet (19); the valve cover (17) is fixedly mounted on the valve body (16), and the main valve seat (15), the main valve flap (9) and the float (4) are respectively mounted in the valve cover (17); the inlet (18) is connected to the cavity inside the valve cover (17), and the discharge orifice (20) is connected to the outlet (19).

7. The float trap according to claim 6, characterized in that: A guide seat (22) is fixedly installed between the outlet (19) and the discharge orifice (20); the interior of the guide seat (22) is hollow and the two ends are open, and the two ends of the guide seat (22) are respectively connected to the outlet (19) and the discharge orifice (20); the guide seat (22) is provided with an exhaust passage that runs through the inside and outside, and an exhaust assembly (23) is installed at one end of the exhaust passage.

8. The float trap according to claim 6, characterized in that: A filter screen (24) is fixedly installed at the inlet (18).

9. The float trap according to claim 6, characterized in that: The valve cover (17) is evenly spaced with a plurality of mounting holes penetrating inside and outside, and plugs (25) are respectively installed at the plurality of mounting holes.

10. The float trap according to claim 6, characterized in that: An observation hole is provided at one end of the valve cover (17) away from the valve body (16), and a sight glass (26) is fixedly mounted at the observation hole.

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