Full-balance valve structure

Abstract

The utility model belongs to the technical field of valves, and discloses a full-balance valve structure which is characterized in that a balance hole is formed in a balance plate in a valve element, the bottom of the balance plate is matched with an inner cavity of a valve body to form a pressure cavity, the top of the balance plate is matched with an inner cavity of a valve cover to form a balance cavity, and the sectional area of the inlet end of the valve element is equal to that of the balance end; the top of the plunger is connected to the driving unit, at least part of the plunger is circumferentially inserted into a sliding cavity formed in the top of the connecting sleeve, the other end of the valve rod is circumferentially connected to a connecting cavity formed in the bottom of the connecting sleeve in a sealed mode, the connecting cavity communicates with the sliding cavity, and the part, located in the balance cavity, of the valve rod is provided with a lateral hole. The axial hole is communicated with the lateral hole and the sliding cavity, the sectional area of the valve rod located in the balance cavity is equal to the cavity bottom area of the sliding cavity, the valve element and the valve rod are both in a balance state, the requirement for driving force of the driving unit at the moment of opening of the valve is lowered, meanwhile, the influence of medium pressure fluctuation on stress of the valve element and the valve rod is avoided, and the control precision of the valve is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially relates to a full balance valve structure. BACKGROUND

[0002] Pressure regulating valve is a kind of device for controlling fluid (gas or liquid) pressure, very common in various industrial applications, such as oil and gas processing, chemical production, home heating system, etc. The main function of pressure regulating valve is to adjust the pressure of input fluid to a predetermined output value, and keep this value stable.

[0003] At present, low-pressure pressure regulating valve mostly adopts non-balanced structure, valve core and valve rod bear medium force for a long time in work, when pressure fluctuates, medium pressure will have great influence on valve core and valve rod, causing valve to fluctuate, affecting valve precision, in some occasions requiring higher precision, non-balanced valve cannot meet the use requirement. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a full balance valve structure, reduces the driving force requirement of valve opening moment, avoids medium pressure fluctuation influence on valve core and valve rod stress, improves the control precision of valve.

[0005] In order to achieve this purpose, the utility model adopts the following technical scheme:

[0006] A full balance valve structure, including valve body, valve cover, valve core, valve rod, elastic part, plunger, connecting sleeve and drive unit, the inside of the valve body is provided with installation cavity, the valve cover extends into the installation cavity and is blocked, the valve core is slidably inserted into the inner cavity of the valve cover, and the outer wall of the valve core is circumferentially abutted against the valve cover, the inside of the valve core is provided with a balance plate, the balance plate is provided with a balance hole, the bottom of the balance plate cooperates with the inner cavity of the valve body to form a pressure cavity, the top of the balance plate cooperates with the inner cavity of the valve cover to form a balance cavity, the cross-sectional area of the inlet end of the valve core is equal to that of the balance end, one end of the valve rod penetrates the valve cover and is connected to the balance plate, the elastic part is sleeved on the valve rod and is abutted between the valve cover and the balance plate, the top of the plunger is connected to the drive unit, at least part of the plunger is circumferentially sealedly connected to the sliding cavity provided at the top of the connecting sleeve, the other end of the valve rod is circumferentially inserted into the connecting cavity provided at the bottom of the connecting sleeve, the connecting cavity is communicated with the sliding cavity, the valve rod located in the balance cavity is provided with a lateral hole, the valve rod is provided with an axial hole, the axial hole is communicated with the lateral hole and the sliding cavity, the cross-sectional area of the valve rod located in the balance cavity is equal to the area of the cavity bottom of the sliding cavity, the drive unit is configured to drive the connecting sleeve to drive the valve rod and the valve core to move upward against the action force of the elastic part, and open the valve.

[0007] As preferred, the driving unit comprises a cover connected to the valve cover, the cover has a driving cavity and a feedback cavity which are not communicated, the other end of the valve rod is located in the driving cavity, when the pressure of the driving cavity reaches a preset value, the connecting sleeve drives the valve rod and the valve core to move up against the force of the elastic member, and the valve is opened.

[0008] As preferred, the driving unit further comprises a diaphragm, the cover comprises an upper cover and a lower cover, the upper cover is buckled to the lower cover and forms a cavity, the lower cover is connected to the valve cover, the outer ring of the diaphragm is circumferentially clamped between the upper cover and the lower cover, the diaphragm, the connecting sleeve and the valve rod divide the cavity into the driving cavity and the feedback cavity, and the plunger is located in the feedback cavity.

[0009] As preferred, the driving unit further comprises an upper chuck and a lower chuck, the connecting sleeve is sealingly inserted into the upper chuck and the lower chuck, and is connected to the upper chuck or the lower chuck, and the inner ring of the diaphragm is clamped between the upper chuck and the lower chuck.

[0010] As preferred, the valve cover comprises a body and a first annular member and a second annular member respectively arranged at the bottom and the top of the body, the first annular member extends into the mounting cavity, at least part of the first annular member is circumferentially sealed against the cavity wall of the mounting cavity, the body is arranged on and bolted to the valve body, and the lower cover is circumferentially sealed to the second annular member.

[0011] As preferred, the bottom of the lower cover is provided with a through hole communicating with the driving cavity, a circumferential annular ring is connected at the through hole, the annular ring extends away from the through hole, and the outer wall thereof is circumferentially connected to the inner wall of the second annular member.

[0012] As preferred, the valve body is provided with an air inlet cavity and an air outlet cavity respectively at two sides, the cavity bottom of the mounting cavity communicates with the air inlet cavity, the side of the mounting cavity communicates with the air outlet cavity, the valve core is connected to the air inlet cavity and the air outlet cavity when moving up, and the valve core cuts off the air inlet cavity and the air outlet cavity when moving down.

[0013] As preferred, one end of the valve rod is bolted to the balance plate, the other end of the valve rod is threadedly connected to the cavity wall of the connecting cavity, the cavity wall of the connecting cavity is embedded with a sealing ring, and the other end of the valve rod is sealingly connected to the sealing ring in the connecting cavity.

[0014] As preferred, the cavity wall of the sliding cavity is embedded with a sealing ring, the sealing ring is located at the top of the sliding cavity, and the plunger is sealingly inserted into the sealing ring in the sliding cavity.

[0015] As preferred, the valve cover is provided with a pressure tapping hole on one side, the pressure tapping hole is communicated with an inlet of the pilot assembly, the lower cover is provided with a driving hole, the driving hole is communicated with the driving cavity, an outlet of the pilot assembly is communicated with the driving hole, and the pilot assembly is configured to stabilize medium pressure and deliver the preset medium pressure to the driving hole.

[0016] The utility model discloses beneficial effect has:

[0017] The utility model provides a full balance valve structure, including valve body, valve cover, valve core, valve rod, elastic part, plunger, connecting sleeve and drive unit, the inside setting installation cavity of valve body, the valve cover enters installation cavity and blocks, the inner chamber of valve cover is slidingly inserted with valve core, and the outer wall of valve core is circumferentially abutted with valve cover, the inside setting balance board of valve core, balance board sets up balance hole, and the bottom of balance board is formed with pressure chamber with the inner chamber cooperation of valve body, and the top of balance board is formed with balance chamber with the inner chamber cooperation of valve cover, and the cross section area of valve core's inlet end and balance end is equal, and one end of valve rod penetrates valve cover and is connected in balance board, and elastic part is set up in valve rod and is abutted between valve cover and balance board, and the top of plunger is connected to drive unit, and at least part plunger is circumferentially inserted in the sliding chamber of the top setting of connecting sleeve, and the other end of valve rod is circumferentially sealedly connected to the connecting chamber of the bottom setting of connecting sleeve, and connecting chamber is communicated with sliding chamber, and the part of valve rod in balance chamber is provided with lateral hole, and valve rod is provided with axial hole, and axial hole is communicated with lateral hole and sliding chamber, and the cross section area of valve rod in balance chamber is equal with the cavity bottom area of sliding chamber, and drive unit is configured as drive connecting sleeve drives valve rod and valve core to overcome the driving force of elastic part and moves up, and opens valve, the utility model provides a full balance valve structure, and valve core and valve rod are all in the balanced state under the valve closing state, and the driving force requirement of drive unit is reduced when valve opens momentarily, and the influence of medium pressure fluctuation on the force of valve core and valve rod is avoided, and the control precision of valve is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a full balance valve structure's structure schematic diagram provided by the utility model embodiment;

[0019] Figure 2 It is a partial structure schematic diagram of a full balance valve structure provided by the utility model embodiment;

[0020] Figure 3 It is the sectional view of valve cover provided by the utility model embodiment;

[0021] Figure 4 It is the sectional view of valve core provided by the utility model embodiment;

[0022] Figure 5 It is the sectional view of valve rod provided by the utility model embodiment;

[0023] Figure 6 Figure 2 is a sectional view of the combination of the plunger, the connecting sleeve and the driving unit provided by the embodiment of the present application.

[0024] In the figure: 1, valve body; 11, air inlet cavity; 12, air outlet cavity; 13, mounting cavity; 14, valve seat; 2, valve cover; 21, body; 211, pressure tapping hole; 22, first annular member; 23, second annular member; 3, valve core; 31, balance plate; 311, balance hole; 301, pressure cavity; 302, balance cavity; 4, valve rod; 41, lateral hole; 42, axial hole; 5, elastic member; 6, plunger; 7, connecting sleeve; 71, sliding cavity; 72, connecting cavity; 8, driving unit; 81, upper cover; 82, lower cover; 821, driving hole; 83, driving cavity; 84, feedback cavity; 85, diaphragm; 86, upper chuck; 87, lower chuck; 9, commander assembly. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0026] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or it can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical and oblique above of the first feature to the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical and oblique below of the first feature to the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0028] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0029] The present embodiment provides a full balance valve structure, in which the valve core and the valve rod are in a balanced state in the closed state of the valve, reducing the driving force requirement of the driving unit at the moment of opening the valve, and avoiding the influence of medium pressure fluctuation on the force of the valve core and the valve rod, thereby improving the control accuracy of the valve.

[0030] Referring to Figure 1 A full balance valve structure includes a valve body 1, a valve cover 2, a valve core 3, a valve rod 4, an elastic member 5, a plunger 6, a connecting sleeve 7, and a driving unit 8. The valve body 1, the valve cover 2, and the driving unit 8 cooperate to form an external contour, and the valve core 3, the valve rod 4, the elastic member 5, the plunger 6, and the connecting sleeve 7 are arranged inside. Specifically, the valve rod 4 is connected to the valve core 3, and under the action of the elastic member 5, the valve core 3 drives the valve rod 4 to press down, and the valve is closed. The driving unit 8 is connected to the valve rod 4, and the driving unit 8 outputs driving force to drive the valve rod 4 to drive the valve core 3 to move upward against the force of the elastic member 5, thereby opening the valve.

[0031] Referring to Figure 2 The two sides of the valve body 1 are respectively provided with an air inlet chamber 11 and an air outlet chamber 12. Preferably, the air inlet chamber 11 and the air outlet chamber 12 are diagonally arranged. The upper part of the valve body 1 is provided with a mounting chamber 13. The bottom of the mounting chamber 13 is communicated with the air inlet chamber 11, and the side of the mounting chamber 13 is communicated with the air outlet chamber 12. Further, the inside of the valve body 1 is also provided with a valve seat 14, and the bottom of the valve seat 14 is circumferentially connected to the bottom of the mounting chamber 13. Preferably, the valve seat 14 is bolted to the valve body 1.

[0032] Through the above arrangement, the valve core 3 is arranged in the mounting chamber 13. In the closed state of the valve, the valve core 3 moves downward, and the bottom of the valve core 3 is circumferentially abutted against the valve seat 14. The side wall of the valve core 3 separates the mounting chamber 13 from the air outlet chamber 12, thereby cutting off the communication between the air inlet chamber 11 and the air outlet chamber 12. In the open state of the valve, the valve core 3 moves upward, and the bottom of the valve core 3 is spaced from the valve seat 14. The mounting chamber 13 is communicated with the air outlet chamber 12 through the spacing, thereby communicating the air inlet chamber 11 and the air outlet chamber 12.

[0033] Preferably, a sealing gasket is arranged circumferentially on the top of the valve seat 14. In the closed state of the valve, the bottom of the valve core 3 is circumferentially abutted against the sealing gasket, thereby improving the sealing performance and preventing leakage of the medium.

[0034] Further, the valve cover 2 is installed on the top of the valve body 1. Specifically, referring to Figure 2 and Figure 3 , the valve cover 2 comprises a body 21, and a first annular member 22 and a second annular member 23 respectively arranged at the bottom and the top of the body 21, the first annular member 22 extends into the installation cavity 13, and at least part of the first annular member 22 is circumferentially connected to the cavity wall of the installation cavity 13, the body 21 is arranged on and bolted to the valve body 1, and the second annular member 23 is sealingly connected to the driving unit 8.

[0035] Further, the valve core 3 is slidingly inserted into the inner cavity of the valve cover 2, that is, the valve core 3 is slidingly inserted into the inner cavity of the first annular member 22, and the outer wall of the valve core 3 circumferentially abuts against the inner cavity of the first annular member 22 to prevent the medium in the valve body 1 from leaking, and the valve core 3 can slide up and down along the axis of the valve body 1 to circumferentially abut against or be separated from the sealing gasket. It should be noted that the bottom of the valve cover 2, that is, the bottom of the first annular member 22, is spaced from the sealing gasket to ensure that the valve cover 2 does not affect the flow of the medium in the valve body 1 during the upward sliding of the valve along the inner cavity of the first annular member 22.

[0036] Referring to Figure 2 and Figure 4 , the valve core 3 has a cylindrical structure, and the inside of the valve core 3 is provided with a balance plate 31, the balance plate 31 is provided with a balance hole 311, the bottom of the balance plate 31 cooperates with the inner cavity of the valve body 1 to form a pressure cavity 301, the top of the balance plate 31 cooperates with the inner cavity of the valve cover 2 to form a balance cavity 302, and the inlet end and the balance end of the valve core 3 are both annular and have equal cross-sectional areas.

[0037] The valve core 3 provided by the embodiment has the following advantages. By arranging the balance plate 31, the balance hole 311, and the inlet end and the balance end of the valve core 3 with equal cross-sectional areas, in the closed state of the valve, the medium pressure in the inlet cavity 11 enters the balance cavity 302 of the valve core 3 through the balance hole 311 and is blocked by the valve cover 2, and the medium pressure simultaneously acts on the inlet end and the balance end of the valve core 3. Since the inlet end and the balance end of the valve core 3 have the same cross-sectional area, the forces on the two ends of the valve core 3 are balanced, and there is no pressure difference, so the valve core 3 is in a balanced state as a whole, which reduces the driving force requirement of the driving unit 8 at the moment when the valve is opened, avoids the influence of the pressure fluctuation of the medium in the valve on the force on the valve core 3, and improves the control accuracy of the valve.

[0038] Specifically, one end of the valve rod 4 penetrates through the valve cover 2 and is bolted to the balance plate 31, and the elastic member 5 is sleeved on the valve rod 4. In the completely closed state of the valve, the elastic member 5 is always in a compressed state to abut against between the balance plate 31 and the valve cover 2, so as to apply a downward pressure to the balance plate 31 and ensure that the bottom of the valve core 3 circumferentially abuts against the sealing gasket.

[0039] Further, the top of the plunger 6 is connected to the driving unit 8, and at least part of the plunger 6 is inserted into the sliding cavity 71 provided at the top of the connecting sleeve 7 in a circumferential direction, and the other end of the valve rod 4 is connected to the connecting cavity 72 provided at the bottom of the connecting sleeve 7 in a circumferential direction, and optionally, the other end of the valve rod 4 is screwed to the connecting cavity 72, the connecting cavity 72 is communicated with the sliding cavity 71, please refer to Figure 1 and Figure 5 The valve rod 4 is provided with a lateral hole 41 at the part of the balance cavity 302, the valve rod 4 is provided with an axial hole 42, the axial hole 42 is communicated with the lateral hole 41 and the sliding cavity 71, and the cross-sectional area of the valve rod 4 in the balance cavity 302 is equal to the bottom area of the sliding cavity 71.

[0040] Preferably, the other end of the valve rod 4 is screwed to the cavity wall of the connecting cavity 72, and the cavity wall of the connecting cavity 72 is embedded with a sealing ring, and the other end of the valve rod 4 is sealingly connected to the sealing ring in the connecting cavity 72. Further preferably, the cavity wall of the sliding cavity 71 is embedded with a sealing ring, and the sealing ring is located at the top of the sliding cavity 71, and the plunger 6 is always sealingly inserted into the sealing ring in the sliding cavity 71.

[0041] The structure of the valve rod 4 provided by the embodiment, by providing the sliding cavity 71, the lateral hole 41 and the axial hole 42, in the valve closing state, the medium pressure in the inlet cavity 11 enters the balance cavity 302 of the valve core 3 through the balance hole 311, and is guided into the sliding cavity 71 through the lateral hole 41 and the axial hole 42, the medium pressure acts on the sliding cavity 71 and the balance cavity 302 at the same time, and since the cross-sectional area of the valve rod 4 in the balance cavity 302 is equal to the bottom area of the sliding cavity 71, the forces on both ends of the valve rod 4 are balanced, and there is no pressure difference, the valve rod 4 as a whole is in a balanced state, which reduces the driving force requirement of the driving unit 8 at the moment of opening the valve, and avoids the influence of the pressure fluctuation of the medium in the valve on the force on the valve rod 4, and improves the control accuracy of the valve.

[0042] The above is the specific structure of the full balanced valve structure provided by the embodiment to realize the valve closing, in the valve closing state, the medium pressure in the inlet cavity 11 enters the balance cavity 302 of the valve core 3 through the balance hole 311, and is blocked by the valve cover 2, the medium pressure acts on the inlet end of the valve core 3 and the balance end of the valve core 3 at the same time, and since the cross-sectional areas of the inlet end of the valve core 3 and the balance end of the valve core 3 are the same, the forces on both ends of the valve core 3 are balanced, the medium pressure in the inlet cavity 11 enters the balance cavity 302 of the valve core 3 through the balance hole 311, and is guided into the sliding cavity 71 through the lateral hole 41 and the axial hole 42, the medium pressure acts on the sliding cavity 71 and the balance cavity 302 at the same time, and since the cross-sectional area of the valve rod 4 in the balance cavity 302 is equal to the bottom area of the sliding cavity 71, the forces on both ends of the valve rod 4 are balanced, the medium pressure in the sliding cavity 71 also acts on the plunger 6, and indirectly acts on the shell of the driving unit 8 through the plunger 6, so that the medium pressure acts on the shell of the driving unit 8.

[0043] The full balance valve structure provided by the embodiment is in a whole balanced state inside the profile, reduces the driving force requirement of the driving unit 8 at the moment of opening the valve, avoids the influence of pressure fluctuation of the medium in the valve on the force of the valve core 3 and the valve rod 4, and improves the control accuracy of the valve.

[0044] The full balance valve structure provided by the embodiment realizes opening of the valve by the driving unit 8 applying force to the valve rod 4 to drive the valve core 3 to move upwards.

[0045] Specifically, referring to Figure 6 , the driving unit 8 comprises a cover body, the cover body comprises a buckled upper cover 81 and a lower cover 82, the upper cover 81 and the lower cover 82 cooperatively form a cavity, the lower cover 82 is connected to the valve cover 2, the cavity is internally provided with a driving cavity 83 and a feedback cavity 84 which are not communicated, the other end of the valve rod 4 is located in the driving cavity 83, when the pressure of the driving cavity 83 reaches a preset value, the driving connecting sleeve 7 drives the valve rod 4 and the valve core 3 to move upwards against the force of the elastic member 5, and the valve is opened. For example, the bottom of the lower cover 82 is provided with a through hole which communicates with the driving cavity 83, a circumferential annular ring is connected to the through hole, the annular ring extends outward away from the through hole, and the outer wall of the annular ring in the lower cover 82 is circumferentially and sealingly connected to the inner wall of the second annular member 23, that is, the outer wall of the annular ring is circumferentially and sealingly connected to the inner wall of the second annular member 23. Preferably, the upper cover 81 is bolted to the lower cover 82, so that the connection strength is large and the sealing performance is strong.

[0046] Please continue to refer to Figure 6 , the driving unit 8 further comprises a diaphragm 85, an upper chuck 86 and a lower chuck 87, the upper chuck 86 is stacked on the lower chuck 87 and is bolted to the lower chuck 87, the diaphragm 85 is annular, the outer ring of the diaphragm 85 is clamped between the upper cover 81 and the lower cover 82, and the inner ring of the diaphragm 85 is clamped between the upper chuck 86 and the lower chuck 87, so that the cavity is divided into the driving cavity 83 and the feedback cavity 84 which are not communicated by the diaphragm 85, the connecting sleeve 7 and the valve rod 4. It should be noted that the plunger 6 is located in the feedback cavity 84.

[0047] Please refer to Figure 1 and Figure 6 , in the embodiment, the other end of the valve rod 4 extends into the driving cavity 83 through the through hole and can slide up and down along the axis of the valve body 1, when the pressure in the driving cavity 83 reaches the preset value, the valve rod 4 can drive the valve core 3 to move upwards along the axis of the valve body 1 against the force of the elastic member 5, so as to communicate the air inlet cavity 11 and the air outlet cavity 12, and switch to the valve opening state.

[0048] The embodiment realizes the stable arrangement of the upper chuck 86 and the lower chuck 87 by the plunger 6 and the connecting sleeve 7, and realizes the structure of moving the valve rod 4 along the axis of the valve body 1.

[0049] For example, one end of the plunger 6 is fixed to the inner wall of the upper cover 81, the axis of the plunger 6 coincides with the axis of the valve body 1, the connecting sleeve 7 is sealingly inserted into the upper chuck 86 and the lower chuck 87, and is connected to at least one of the upper chuck 86 and the lower chuck 87, the top of the connecting sleeve 7 is provided with a sliding cavity 71, the bottom of the connecting sleeve 7 is provided with a connecting cavity 72, the other end of the valve stem 4 is inserted into the connecting cavity 72 in a circumferential direction, and under the support of the valve stem 4, the lower chuck 87 is spaced from the lower cover 82, and at least part of the other end of the plunger 6 is always inserted into the sliding cavity 71 in a circumferential direction.

[0050] Through the above structure, when the pressure of the driving cavity 83 reaches the preset value, the pressure acting on the lower chuck 87 and the diaphragm 85 overcomes the force of the elastic member 5, pushes the lower chuck 87 to move upwards, the connecting sleeve 7 moves upwards along the axis of the plunger 6, the part of the other end of the plunger 6 inserted into the sliding cavity 71 gradually expands, and drives the valve and the valve core 3 to move upwards.

[0051] Further, the pressure of the driving cavity 83 is derived from the inside of the valve core 3. Specifically, please refer to Figure 1 、 Figure 3 and Figure 6 A pressure tapping hole 211 is formed on one side of the valve cover 2, and a driving hole 821 is formed in the lower cover 82, which communicates with the driving cavity 83, and the pressure is transmitted to the driving cavity 83 through the pressure tapping hole 211.

[0052] In order to ensure stable pressure, the present embodiment also provides a director assembly 9, which includes two directors connected in series, the pressure tapping hole 211 communicates with the inlet of one of the directors, and after the stable medium pressure is transmitted to the other director, it is further output to the driving cavity 83 through the driving hole 821, and the stable medium pressure is converted and amplified into driving force by the driving unit 8, so that sufficient power can be provided for the valve opening even in a low pressure environment.

[0053] The full balanced valve structure provided by the present embodiment has the following advantages:

[0054] 1. Reduce the driving force requirement at the valve opening moment, specifically, in the valve closed state, the medium pressure in the inlet cavity 11 enters the balance cavity 302 of the valve core 3 through the balance hole 311, and is blocked by the valve cover 2, the medium pressure acts on the inlet end of the valve core 3 and the balance end of the valve core 3, since the cross-sectional area of the inlet end of the valve core 3 and the balance end of the valve core 3 is the same, the valve core 3 is balanced at both ends, the medium pressure in the inlet cavity 11 enters the balance cavity 302 of the valve core 3 through the balance hole 311, and is introduced into the sliding cavity 71 through the lateral hole 41 and the axial hole 42, the medium pressure acts on the sliding cavity 71 and the valve rod 4 located in the balance cavity 302, since the cross-sectional area of the valve rod 4 located in the balance cavity 302 is equal to the area of the bottom of the sliding cavity 71, the valve rod 4 is balanced at both ends, the driving unit 8 no longer needs to overcome the force of the medium pressure on the valve core 3 and the valve rod 4, thereby reducing the driving force requirement at the valve opening moment.

[0055] 2. Improve the control accuracy, specifically, the valve core 3 and the valve rod 4 are balanced at both ends and in a balanced state, the medium pressure fluctuation in the valve has no effect on the force of the valve core 3 and the valve rod 4, the output force required by the driving unit 8 to drive the valve core 3 and the valve rod 4 to move upward is stable, thereby improving the control accuracy of the valve.

[0056] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not a limitation on the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A fully balanced valve structure, characterized in that: The invention comprises a valve body (1), a valve cover (2), a valve core (3), a valve stem (4), an elastic member (5), a plunger (6), a connecting sleeve (7) and a driving unit (8); an installation cavity (13) is provided inside the valve body (1); the valve cover (2) extends into the installation cavity (13) and seals it; the valve core (3) is slidably inserted into the inner cavity of the valve cover (2); the outer wall of the valve core (3) circumferentially abuts against the valve cover (2); a balance plate (31) is provided inside the valve core (3); The balancing plate (31) is provided with a balancing hole (311), the bottom of the balancing plate (31) cooperates with the inner cavity of the valve body (1) to form a pressure chamber (301), the top of the balancing plate (31) cooperates with the inner cavity of the valve cover (2) to form a balancing chamber (302), the inlet end and the balancing end of the valve core (3) have the same cross-sectional area, one end of the valve stem (4) passes through the valve cover (2) and is connected to the balancing plate (31), and the elastic member (5) is sleeved on the valve stem (4 ) and abuts between the valve cover (2) and the balancing plate (31), the top of the plunger (6) is connected to the drive unit (8), at least part of the plunger (6) is circumferentially inserted into the sliding cavity (71) provided at the top of the connecting sleeve (7), the other end of the valve stem (4) is circumferentially sealed and connected to the connecting cavity (72) provided at the bottom of the connecting sleeve (7), the connecting cavity (72) is connected to the sliding cavity (71), and the valve stem (4) is located at the balancing cavity (302) A lateral hole (41) is partially opened, and the valve stem (4) is opened with an axial hole (42), and the axial hole (42) is connected to the lateral hole (41) and the sliding cavity (71). The cross-sectional area of ​​the valve stem (4) located in the balancing cavity (302) is equal to the cavity bottom area of ​​the sliding cavity (71), and the driving unit (8) is configured to drive the connecting sleeve (7) to drive the valve stem (4) and the valve core (3) to overcome the action of the elastic member (5) and move upward to open the valve.

2. A fully balanced valve structure according to claim 1, characterized in that: The driving unit (8) includes a cover body, which is connected to the valve cover (2). A non-connected driving chamber (83) and a feedback chamber (84) are provided inside the cover body. The other end of the valve stem (4) is located in the driving chamber (83). When the pressure of the driving chamber (83) reaches a preset value, the connecting sleeve (7) is driven to drive the valve stem (4) and the valve core (3) to overcome the force of the elastic member (5) and move upward to open the valve.

3. A fully balanced valve structure according to claim 2, characterized in that: The drive unit (8) further includes a diaphragm (85), the cover body includes an upper cover (81) and a lower cover (82), the upper cover (81) is fastened to the lower cover (82) to form a cavity, the lower cover (82) is connected to the valve cover (2), the outer ring of the diaphragm (85) is circumferentially clamped between the upper cover (81) and the lower cover (82), the diaphragm (85), the connecting sleeve (7) and the valve stem (4) separate the cavity into the drive cavity (83) and the feedback cavity (84), and the plunger (6) is located in the feedback cavity (84).

4. A fully balanced valve structure according to claim 3, characterized in that: The driving unit (8) further comprises an upper chuck (86) and a lower chuck (87); the connecting sleeve (7) is sealingly inserted into the upper chuck (86) and the lower chuck (87) and is connected to the upper chuck (86) or the lower chuck (87); the inner ring of the diaphragm (85) is clamped between the upper chuck (86) and the lower chuck (87).

5. A fully balanced valve structure according to claim 3, characterized in that: The valve cover (2) includes a body (21) and a first annular member (22) and a second annular member (23) respectively arranged at the bottom and the top of the body (21), wherein the first annular member (22) extends into the installation cavity (13), and at least a portion of the first annular member (22) is circumferentially sealed against the cavity wall of the installation cavity (13). The body (21) is mounted on and bolted to the valve body (1), and the lower cover (82) is circumferentially sealed to the second annular member (23).

6. A fully balanced valve structure according to claim 5, characterized in that: The bottom of the lower cover (82) is provided with a through hole connected to the driving cavity (83), and the through hole is circumferentially connected to an annular ring, which extends away from the through hole and has an outer wall circumferentially connected to the inner wall of the second annular member (23).

7. A fully balanced valve structure according to claim 1, characterized in that: An air inlet cavity (11) and an air outlet cavity (12) are respectively provided on both sides of the valve body (1); the bottom of the installation cavity (13) is connected to the air inlet cavity (11); the side of the installation cavity (13) is connected to the air outlet cavity (12); the valve core (3) moves upward to connect the air inlet cavity (11) and the air outlet cavity (12); the valve core (3) moves downward to cut off the air inlet cavity (11) and the air outlet cavity (12).

8. A fully balanced valve structure according to claim 1, characterized in that: One end of the valve stem (4) is bolted to the balance plate (31), and the other end of the valve stem (4) is threadedly connected to the cavity wall of the connecting cavity (72), and a sealing ring is embedded in the cavity wall of the connecting cavity (72), and the other end of the valve stem (4) is sealed to the sealing ring in the connecting cavity (72).

9. A fully balanced valve structure according to claim 1, characterized in that: A sealing ring is embedded in the cavity wall of the sliding cavity (71), and the sealing ring is located at the top of the sliding cavity (71). The plunger (6) is sealed and inserted into the sealing ring in the sliding cavity (71).

10. A fully balanced valve structure according to claim 3, characterized in that: The invention comprises a controller assembly (9), a pressure-taking hole (211) is provided on one side of the valve cover (2), the pressure-taking hole (211) is connected to the inlet of the controller assembly (9), the lower cover (82) is provided with a drive hole (821), the drive hole (821) is connected to the drive chamber (83), the outlet of the controller assembly (9) is connected to the drive hole (821), and the controller assembly (9) is configured to stabilize the medium pressure and deliver the medium pressure of the preset value to the drive hole (821).

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