Valve structure with adjustable output pressure

Abstract

The utility model discloses a valve structure with adjustable output pressure, which comprises a shell, a gas flow channel and a pressure reducing mechanism, the pressure reducing mechanism comprises a piston and a balance spring, the valve structure further comprises an opening and closing mechanism, the opening and closing mechanism comprises a pushing nut and a rotating rod, and the pushing nut is positioned on one side, far away from the balance spring, of the piston; the rotating rod drives the pushing nut to axially move along the rotating rod, the pushing nut is used for pushing the piston, and the rotating rod is provided with a hand wheel after penetrating out of the shell. An axial channel is formed in the middle of the rotating rod, an axial receding hole is formed in the middle of the hand wheel, and the channel and the receding hole are coaxially arranged. A pressure adjusting mechanism is arranged in the channel and used for adjusting the position of the piston. The pressure adjusting mechanism comprises a pressure adjusting screw and a pressure adjusting spring, the pressure adjusting screw is connected into the channel in a threaded mode, and the pressure adjusting spring is arranged between the pressure adjusting screw and the piston. The position of the piston is adjusted through the pressure adjusting structure so that pressure can be adjusted, and the piston is pushed through the opening and closing mechanism so that the valve can be closed. After the push nut of the opening and closing mechanism closes the valve, the position of the pressure adjusting screw of the pressure adjusting structure is unchanged, and pressure adjustment is not needed after the valve is opened.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure gas valves, in particular to a valve structure with adjustable output pressure. Background Art

[0002] Pressure reducing valves are widely used in industrial production, construction industry, petroleum and chemical industry, hot spring and swimming pool equipment, automobile and mechanical equipment. Pressure reducing valves can be divided into diaphragm type, spring diaphragm type, piston type, lever type and bellows type according to their structural form. Existing high-pressure gas valves are equipped with pistons and adjustment mechanisms. The position of the piston is adjusted by the adjustment mechanism to achieve pressure regulation and opening and closing of the valve. However, this type of valve has the problem of needing to re-adjust the pressure every time it is opened. Utility Model Content

[0003] The utility model provides a valve structure with adjustable output pressure to solve the above technical problems.

[0004] In order to achieve the above purpose, the technical solution of the utility model is:

[0005] A valve structure with adjustable output pressure comprises: a shell, a gas flow channel and a pressure reducing mechanism, the pressure reducing mechanism comprises a piston and a balance spring, and also comprises an opening and closing mechanism, the opening and closing mechanism comprises: a push nut and a rotating rod, the push nut is located on the side of the piston away from the balance spring, the rotating rod drives the push nut to move axially along the rotating rod, the push nut is used to push the piston, and a hand wheel is installed on the rotating rod after passing through the shell.

[0006] An axial channel is arranged in the middle of the rotating rod, an axial clearance hole is arranged in the middle of the hand wheel, and the channel and the clearance hole are coaxially arranged; a pressure regulating mechanism is arranged in the channel for adjusting the position of the piston.

[0007] The pressure regulating mechanism comprises: a pressure regulating screw and a pressure regulating spring. The pressure regulating screw is connected in the channel by thread, and the pressure regulating spring is arranged between the pressure regulating screw and the piston.

[0008] Preferably, the pressure-adjusting spring is sleeved on the end of the pressure-adjusting screw facing the piston.

[0009] Preferably, the end of the rotating rod away from the piston passes through the handwheel and is installed with a shaft retaining ring, and the rotating rod and the handwheel are connected by a profile.

[0010] Preferably, the push nut is threadedly connected to the outer side of the rotating rod at one end facing the piston, and the outer side of the push nut is connected to the housing by profile connection.

[0011] Preferably, the gas flow path includes a high-pressure intake passage and a low-pressure outlet passage. An air outlet nozzle is provided inside the housing. The outlet of the high-pressure intake passage is located on the bottom plane of the air outlet nozzle, and the outlet of the low-pressure outlet passage is located on the bottom side wall of the air outlet nozzle. One end of the piston away from the rotating rod extends into the air outlet nozzle, and a fourth sealing assembly is provided between the piston and the air outlet nozzle.

[0012] The piston and the air outlet nozzle enclose a first cavity. The end face of the piston facing the rotating rod, the housing, the rotating rod, and the pressure regulating screw enclose a second cavity. The side of the piston away from the rotating rod, the housing, and the air outlet nozzle enclose a third cavity.

[0013] Preferably, a first air passage is provided inside the piston. The inlet of the first air passage is located inside the air outlet nozzle, and the outlet is located on the end face of the piston facing the rotating rod.

[0014] Preferably, the balance spring is sleeved outside the air outlet nozzle, and the two ends of the balance spring are respectively abutted against the housing and the piston.

[0015] Preferably, a second air passage is also provided on the housing. The second air passage connects the third cavity to the outside of the housing; a safety plug is installed on the piston.

[0016] Advantageous effects:

[0017] A valve structure with adjustable output pressure disclosed in the present application realizes the regulation of the position of the piston through the setting of a pressure regulating structure, thereby realizing pressure regulation. Also, the piston is pushed by an opening and closing mechanism to close the valve. After the push nut of the opening and closing mechanism closes the valve, the position of the pressure regulating screw of the pressure regulating structure remains unchanged, ensuring that there is no need to re-regulate the pressure after the valve is opened. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of an open state of a valve structure with adjustable output pressure disclosed in the present invention;

[0020] Figure 2 It is a schematic structural diagram of a closed state of a valve structure with adjustable output pressure disclosed in the present invention;

[0021] Figure 3 It is Figure 2 a partial enlarged view of I in

[0022] Figure 4Schematic diagram of the structure of a rotating rod, shaft retaining ring and handwheel assembly of a valve structure with adjustable output pressure disclosed by the present utility model.

[0023] 1. Housing; 11. Valve body; 12. Valve cover; 13. Air outlet nozzle; 14. High-pressure intake passage; 15. Low-pressure outlet passage; 16. Second passage; 2. Piston; 21. Upper piston; 22. Connecting rod; 23. Lower piston; 24. First passage; 25. Safety plug; 3. Balance spring; 41. Push nut; 42. Rotating rod; 43. Handwheel; 44. Shaft retaining ring; 51. Pressure-regulating screw; 52. Pressure-regulating spring; 61. First cavity; 62. Second cavity; 63. Third cavity. Detailed implementation manner

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] Existing high-pressure gas valves include: a housing 1, a gas flow passage, a pushing device and a pressure-reducing mechanism. The pressure-reducing mechanism includes a piston 2 and a balance spring 3. A gas flow passage is provided in the housing 1 for gas inlet and outlet. The piston 2 is installed in the housing 1 and is used to realize the on-off of the gas flow passage. The piston 2, the gas flow passage and the housing 1 cooperate to form a throttle orifice for pressure reduction. The pushing device is used to push the piston 2 to move downward along its axis. The piston 2 is inserted into the balance spring 3, and the balance spring 3 supports the piston 2 for the return of the piston 2. The pressure-reducing mechanism and the balance spring 3 jointly act to adjust the position of the piston 2.

[0026] A valve structure with adjustable output pressure, in combination with Figure 1 , Figure 2 , Figure 3 and Figure 4 as shown, includes: a housing 1, a gas flow passage and a pressure-reducing mechanism. The pressure-reducing mechanism includes a piston 2 and a balance spring 3.

[0027] It further includes an opening and closing mechanism, and the opening and closing mechanism includes: a push nut 41 and a rotating rod 42. The push nut 41 is located on the side of the piston 2 away from the balance spring 3. The rotating rod 42 drives the push nut 41 to move axially along the rotating rod 42. The push nut 41 is used to push the piston 2, and a handwheel 43 is installed after the rotating rod 42 passes through the housing 1.

[0028] A channel is provided axially in the middle of the rotating rod 42, and a relief hole is provided axially in the middle of the handwheel 43. The channel and the relief hole are coaxially arranged. A pressure regulating mechanism is provided in the channel for adjusting the position of the piston 2.

[0029] The pressure regulating mechanism includes: a pressure regulating screw 51 and a pressure regulating spring 52. The pressure regulating screw 51 is threadedly connected in the channel, and the pressure regulating spring 52 is arranged between the pressure regulating screw 51 and the piston 2.

[0030] Rotating the handwheel 43 drives the rotating rod 42 to rotate. When the rotating rod 42 rotates, the rotating rod 42 drives the push nut 41 to move axially, and the pressure regulating screw 51 rotates with the rotating rod 42 without axial movement. Rotating the handwheel 43 separates the push nut 41 from the piston 2, and the piston 2 moves upward under the action of the balance spring 3 to open the valve. Keeping the handwheel 43 stationary and turning the pressure regulating screw 51 to adjust the compression amount of the pressure regulating spring 52, thereby realizing the adjustment of the position of the piston 2 and thus realizing the pressure regulation. Rotating the handwheel 43 in the reverse direction causes the push nut 41 to push the piston 2 downward until the valve closes. At this time, the position of the pressure regulating screw 51 remains unchanged. When the valve is reopened, the pressure regulating spring 52 can directly return to the adjusted compression amount to reproduce the adjusted pressure range. In summary, the valve structure solves the problem that the existing high-pressure seal switch needs to be readjusted every time it is opened.

[0031] Preferably, the push nut 41 is threadedly connected to the outside of one end of the rotating rod 42 facing the piston 2, and the outside of the push nut 41 is connected to the housing 1 by a profiled surface to ensure that the rotation of the rotating rod 42 drives the push nut 41 to move axially and restricts the rotation of the push nut 41.

[0032] Specifically, the housing 1 includes a valve body 11 and a valve cover 12. A first installation cavity is opened in the valve body 11, and the opening of the first installation cavity is located on the top surface of the valve body 11. A second installation cavity is opened in the valve cover 12, and the second installation cavity is provided with an upper opening and a lower opening. An internal thread is provided in the first installation cavity of the valve body 11, and an external thread is provided on the outside of the valve cover 12. The valve cover 12 and the valve body 11 are fixed by threaded connection.

[0033] Specifically, the piston 2 includes, from top to bottom: an upper piston 21, a connecting rod 22 and a lower piston 23, and the piston 2 is integrally formed. The outer peripheral surface of the upper piston 21 is sealed with the inner wall of the valve cover 12 by a first sealing component, and the first sealing component uses an O-ring.

[0034] Specifically, the cross section of the push nut 41 is a regular hexagon, and the corresponding inner wall of the valve cover 12 is provided as a hexagonal hole. The push nut 41 is installed in the hexagonal hole of the valve cover 12 to achieve profiled surface connection.

[0035] Preferably, the end of the rotating rod 42 away from the piston 2 passes through the handwheel 43 and an axial retaining ring 44 is installed to limit the downward movement of the rotating rod 42 and prevent the rotating rod 42 from falling; the rotating rod 42 and the handwheel 43 are connected by a profile connection to enable the rotating rod 42 to rotate with the handwheel 43.

[0036] Specifically, external threads are machined on the outer periphery of the lower part of the rotating rod 42, and internal threads are machined on the inner side of the push nut 41. The rotating rod 42 is screwed into the push nut 41. By rotating the rotating rod 42, under the restriction of the hexagonal hole of the valve cover 12, the push nut 41 can move along the axis. The top end of the rotating rod 42 passes through the upper opening of the valve cover 12 and then through the handwheel 43. A second sealing assembly is installed between the middle part of the rotating rod 42 and the valve cover 12 for sealing, and the second sealing assembly uses an O-ring. The outer periphery of the rotating rod 42 is a stepped shaft, and the shaft shoulder of the rotating rod 42 abuts against the top wall of the valve cover 12 to limit the upward movement of the rotating rod 42 and prevent the rotating rod 42 from coming out of the valve cover 12. The shaft shoulder of the rotating rod 42 cooperates with the axial retaining ring 44 to realize the axial limit of the rotating rod 42.

[0037] Preferably, the pressure regulating spring 52 is sleeved on the end of the pressure regulating screw 51 facing the piston 2, so that the end face of the pressure regulating spring 52 is evenly stressed and local stress concentration is avoided.

[0038] Specifically, it is also possible to select to open a blind hole or an annular groove in the center of the pressure regulating screw 51, and insert the top end of the pressure regulating screw 51 into the blind hole or the annular groove.

[0039] Specifically, the middle part of the pressure regulating screw 51 is a smooth surface that cooperates with the channel of the rotating rod 42 and is sealed by a third sealing assembly, and the third sealing assembly uses an O-ring. External threads are machined on the upper part of the pressure regulating screw 51, and internal threads are machined on the upper part of the channel of the rotating rod 42. The pressure regulating screw 51 is threadedly connected to the rotating rod 42. The external threads of the pressure regulating screw 51 and the external threads of the rotating rod 42 have opposite helix directions to prevent the pressure regulating screw 51 from loosening when the rotating rod 42 rotates.

[0040] Preferably, the gas flow path includes a high-pressure intake passage 14 and a low-pressure outlet passage 15, and the high-pressure intake passage 14 and the low-pressure outlet passage 15 are opened in the valve body 11 of the housing 1. An air outlet nozzle 13 is provided in the first installation cavity of the valve body 11 of the housing 1. The outlet of the high-pressure intake passage 14 is located at the bottom plane of the air outlet nozzle 13, and the outlet of the low-pressure outlet passage 15 is located on the bottom side wall of the air outlet nozzle 13; one end of the piston 2 away from the rotating rod 42 extends into the air outlet nozzle 13, that is, the lower piston 23 of the piston 2 extends into the air outlet nozzle 13; a fourth sealing assembly is provided between the lower piston 23 of the piston 2 and the air outlet nozzle 13, and the fourth sealing assembly uses an O-ring.

[0041] The lower piston 23 of the piston 2 and the air outlet nozzle 13 enclose a first cavity 61. The end face of the upper piston 21 of the piston 2 facing the rotating rod 42, the inner wall of the second installation cavity of the valve cover 12 of the housing 1, the rotating rod 42, and the pressure regulating screw 51 enclose a second cavity 62. The side of the piston 2 away from the rotating rod 42, the inner wall of the second installation cavity of the valve cover 12, the inner wall of the first installation cavity of the valve body 11 of the housing 1, and the air outlet nozzle 13 enclose a third cavity 63.

[0042] Preferably, a first air passage 24 is formed in the piston 2. The inlet of the first air passage 24 is located in the air outlet nozzle 13, and the outlet is located at the end face of the piston 2 facing the rotating rod 42. The first air passage 24 connects the first cavity 61 and the second cavity 62.

[0043] Preferably, the balance spring 3 is sleeved outside the air outlet nozzle 13. The two ends of the balance spring 3 are respectively abutted against the housing 1 and the piston 2, that is, the balance spring 3 is located in the third cavity 63. The balance spring 3 supports the piston 2 and provides a force opposite to that of the pressure regulating spring 52.

[0044] Preferably, a second air passage 16 is further formed in the valve body 11 of the housing 1. The second air passage 16 connects the third cavity 63 to the outside of the housing 1. A safety plug 25 is installed on the upper piston 21 of the piston 2. The safety plug 25 is a prior art and will not be described in detail here. When the pressure in the second cavity 62 is too high, the safety plug 25 is pushed open to connect the second cavity 62 and the third cavity 63 to achieve pressure relief.

[0045] The working principle of the device of the present application:

[0046] Process of closing the valve:

[0047] Rotating the handwheel 43 drives the rotating rod 42 to rotate synchronously. The rotating rod 42 drives the push nut 41 to move downward. The push nut 41 abuts downward against the upper piston 21 of the piston 2. Continuing to rotate the handwheel 43, the push nut 41 and the gas pressure in the second cavity 62 jointly push the upper piston 21 downward. The balance spring 3 is compressed under force, and the pressure of the pressure regulating spring 52 is released until the bottom end of the lower piston 23 of the piston 2 completely fits with the outlet of the high-pressure air inlet passage 14 to close the valve.

[0048] Process of opening the valve and reducing pressure:

[0049] Rotate the handwheel 43 in the reverse direction to drive the rotating rod 42 to rotate synchronously. The rotating rod 42 drives the pushing nut 41 to move upward until the pushing nut 41 abuts against the top wall of the valve cover 12. The balance spring 3 gradually releases pressure, pushing the upper piston 21 upward, and the lower piston 23 disengages from the outlet of the high-pressure air inlet passage 14. High-pressure gas enters the first cavity 61 from the high-pressure air inlet passage 14. A part of it instantaneously flows out from the low-pressure air outlet passage 15, and another part enters the second cavity 62 from the first air passage 24. The upper piston 21 continues to move upward to compress the pressure-regulating spring 52, and the air pressure in the second cavity 62 also gradually increases. The pressure-regulating spring 52 and the air pressure act together to provide a force opposite to that of the balance spring 3. The upper piston 21 gradually reaches the equilibrium position under the action of the pressure-regulating spring 52, air pressure, and balance spring 3. Since the position of the pressure-regulating screw 51 remains unchanged, the upper piston 21 will return to the original equilibrium position.

[0050] When the output pressure needs to be adjusted again, rotate the pressure-regulating screw 51 to move it up and down within the rotating rod 42, thereby adjusting the compression amount of the pressure-regulating screw 51, changing the force applied to the upper piston 21, and the upper piston 21 reaches a new equilibrium position. Furthermore, the distance between the lower piston 23 and the outlet of the high-pressure air inlet passage 14 is changed, achieving the purpose of changing the size of the throttle orifice and realizing the adjustment of the resistance of gas flow to adjust the gas pressure.

[0051] Response to abnormal situations:

[0052] During the closing or pressure reduction process, if the piston 2 slides abnormally up and down or the bottom end of its lower piston 23 cannot close the high-pressure air inlet passage 14, such situations will cause gas to continuously enter the second cavity 62. When the air pressure in the second cavity 62 reaches a certain level, the gas pressure pushes the safety plug 25 to open, allowing the gas in the second cavity 62 to enter the third cavity 63 and release pressure through the second air passage 16, preventing risks such as explosion.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A valve structure with adjustable output pressure, comprising: A housing (1), a gas flow passage, and a pressure reducing mechanism. The pressure reducing mechanism includes a piston (2) and a balance spring (3). It is characterized in that it further includes an opening and closing mechanism, and the opening and closing mechanism includes: a push nut (41) and a rotating rod (42). The push nut (41) is located on the side of the piston (2) away from the balance spring (3). The rotating rod (42) drives the push nut (41) to move axially along the rotating rod (42). The push nut (41) is used to push the piston (2). A handwheel (43) is installed after the rotating rod (42) passes through the housing (1); An axial channel is provided in the middle of the rotating rod (42), and an axially recessed hole is provided in the middle of the handwheel (43). The channel and the recessed hole are coaxially arranged; A pressure regulating mechanism is provided in the channel for adjusting the position of the piston (2); The pressure regulating mechanism includes: a pressure regulating screw (51) and a pressure regulating spring (52). The pressure regulating screw (51) is threadedly connected in the channel, and the pressure regulating spring (52) is arranged between the pressure regulating screw (51) and the piston (2).

2. The valve structure with adjustable output pressure according to claim 1, characterized in that, The pressure regulating spring (52) is sleeved on the end of the pressure regulating screw (51) facing the piston (2).

3. The valve structure with adjustable output pressure according to claim 1, characterized in that, The end of the rotating rod (42) away from the piston (2) passes through the handwheel (43) and an axial retaining ring (44) is installed. The rotating rod (42) and the handwheel (43) are connected by a profiled surface connection.

4. A valve structure with adjustable output pressure according to claim 1, characterized in that, The push nut (41) is threadedly connected to the outside of one end of the rotating rod (42) facing the piston (2), and the outside of the push nut (41) is connected to the housing (1) by a profiled surface connection.

5. The valve structure with adjustable output pressure according to claim 1, characterized in that The gas flow passage includes a high-pressure intake passage (14) and a low-pressure outlet passage (15). An air outlet nozzle (13) is provided in the housing (1). The outlet of the high-pressure intake passage (14) is located on the bottom plane of the air outlet nozzle (13), and the outlet of the low-pressure outlet passage (15) is located on the bottom side wall of the air outlet nozzle (13); One end of the piston (2) away from the rotating rod (42) extends into the air outlet nozzle (13), and a fourth sealing assembly is provided between the piston (2) and the air outlet nozzle (13); The piston (2) and the air outlet nozzle (13) enclose a first cavity (61). The end face of the piston (2) facing the rotating rod (42), the housing (1), the rotating rod (42), and the pressure regulating screw (51) enclose a second cavity (62). The side of the piston (2) away from the rotating rod (42), the housing (1), and the air outlet nozzle (13) enclose a third cavity (63).

6. The valve structure with adjustable output pressure according to claim 5, characterized in that, A first air passage (24) is opened in the piston (2). The inlet of the first air passage (24) is located in the air outlet nozzle (13), and the outlet is located on the end face of the piston (2) facing the rotating rod (42).

7. The valve structure with adjustable output pressure according to claim 6, characterized in that, The balance spring (3) is sleeved outside the air outlet nozzle (13), and the two ends of the balance spring (3) are respectively abutted against the housing (1) and the piston (2).

8. A valve structure with adjustable output pressure according to claim 7, characterized in that, A second air passage (16) is also formed on the housing (1), and the second air passage (16) communicates the third cavity (63) to the outside of the housing (1); A safety plug (25) is installed on the piston (2).

Images