Program control valve

Abstract

The utility model belongs to the technical field of valves, and particularly discloses a program control valve which comprises a valve body, and a valve seat is arranged in the valve body. The executing mechanism is arranged on the valve body and comprises a cylinder body, an end cover and a valve rod, and the end cover is arranged at the end, away from the valve body, of the cylinder body; the fixing assembly is arranged on the end cover and used for positioning the valve rod, the fixing assembly comprises a supporting sleeve and a sliding sealing assembly, the sliding sealing assembly is arranged between the valve rod and the supporting sleeve and used for enabling the valve rod to slide in the axial direction of the sliding sealing assembly, and the supporting sleeve is in floating connection with the end cover. By means of the fixing assembly, the valve rod can float by a moving distance in the left-right direction relative to the end cover, and therefore automatic centering of the valve rod in the moving process is achieved, the assembling difficulty is lowered, and the service life of the valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a program-controlled valve. Background Art

[0002] A programmable valve is a regulating valve that controls the position of the valve by controlling the electrical signal of the actuator. Its working principle is similar to that of an ordinary regulating valve, but the programmable valve uses high-precision electronic components and computer control technology, and can automatically control according to preset conditions to achieve more intelligent and precise regulation.

[0003] In the prior art, during the valve installation process, since the valve stem is installed on the actuator, assembly errors and / or part processing errors may easily lead to excessive coaxiality deviation of the valve stem, which may easily affect the service life of the valve during long-term use. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a program-controlled valve for solving the problem of excessive coaxiality deviation of the valve stem of the prior art valve during operation.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a program-controlled valve, comprising:

[0006] a valve body, wherein a valve seat is provided in the valve body;

[0007] An actuator is provided on the valve body, the actuator comprising a cylinder body, an end cover and a valve stem, the end cover being provided at an end of the cylinder body away from the valve body;

[0008] A fixing assembly is arranged on the end cover, and the fixing assembly is used to position the valve stem. The fixing assembly includes a support sleeve and a sliding sealing assembly. The sliding sealing assembly is arranged between the valve stem and the support sleeve and is used for the valve stem to slide along its own axial direction. The support sleeve is floatingly connected to the end cover.

[0009] Optionally, the sliding sealing assembly includes a third sealing ring, a second grease groove, a fourth sealing ring and a sliding bearing arranged in sequence from top to bottom, the third sealing ring, the second grease groove and the fourth sealing ring are all arranged between the support sleeve and the valve stem, and the sliding bearing is arranged on the support sleeve and sleeved on the valve stem.

[0010] Optionally, there is a floating gap between the support sleeve and the end cover, and the floating gap is 0.2mm to 0.4mm.

[0011] Optionally, a protective shell is provided on the end cover, and a limit piece is provided at one end of the valve stem passing through the support sleeve. The limit piece is arranged along the axial direction of the valve stem, and the limit piece is provided with a shielding portion. At least one induction switch is provided on the protective shell, and the induction switch is arranged along the radial direction of the valve stem. The height of the shielding portion is greater than the diameter of the induction end of the induction switch.

[0012] Optionally, a plurality of locking members are provided along the circumference of the support sleeve, and the locking members pass through the support sleeve and are threadedly connected to the end cover.

[0013] Optionally, the free end of the valve stem is provided with a valve core that can be used for sealing connection with the valve seat, and the valve stem is provided with a piston, which is located on the side of the valve core away from the valve seat and inside the valve body, and a second cavity is formed between the piston and the valve body, and the valve body is provided with a balancing pipe assembly for connecting the first cavity and the second cavity.

[0014] Optionally, a middle cylinder cover is provided in the cylinder body, and a first driving plug and a second driving plug are respectively provided on both sides of the middle cylinder cover. A third cavity, a fourth cavity, a fifth cavity and a sixth cavity are sequentially provided in the cylinder body from bottom to top. The third cavity is arranged between the second driving plug and the valve body, the fourth cavity is arranged between the middle cylinder cover and the second driving plug, the fifth cavity is arranged between the middle cylinder cover and the first driving plug, and the sixth cavity is arranged between the first driving plug and the end cover.

[0015] Optionally, a first air inlet and outlet is provided on the end cover, and the port of the first air inlet and outlet faces the sixth cavity; a second air inlet and outlet is provided on the middle cylinder cover, and the port of the second air inlet and outlet faces the fourth cavity; a third air inlet and outlet is provided on the middle cylinder cover, and the port of the third air inlet and outlet faces the fifth cavity; a fourth air inlet and outlet is provided on the valve body, and the port of the fourth air inlet and outlet faces the third cavity.

[0016] As described above, the program-controlled valve proposed by the present invention has the following beneficial effects:

[0017] Compared with the prior art, the present invention provides a fixing assembly so that the valve stem can float in the left and right directions relative to the end cover, thereby realizing automatic centering of the valve stem during movement, reducing assembly difficulty and improving the life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a structural schematic diagram of the prior art;

[0019] Figure 2 Shown is a schematic structural diagram of an embodiment of the present invention;

[0020] Figure 3 Shown is an enlarged view of point A in the present invention;

[0021] Figure 4 Shown is an enlarged view of point B in the present invention;

[0022] Figure 5 Shown is an enlarged view of point C in the present invention;

[0023] Figure 6 Shown is a schematic diagram of the actuator in the present invention.

[0024] Description of reference numerals:

[0025] Valve body 1, first cavity 101, second cavity 102, fourth air inlet and outlet 103, valve seat 2, valve stem 3, piston 4, first sealing ring 401, first grease groove 402, second sealing ring 403, PTFE guide belt 404, first channel 5, first ferrule 6, connecting pipe 7, second ferrule 8, second channel 9, cylinder body 10, third cavity 1001, fourth cavity 1002, fifth cavity 1003, sixth cavity 1004, middle cylinder cover 11, second air inlet and outlet Air port 1101, third air inlet and outlet 1102, first drive plug 12, connecting sleeve 13, positioning bearing 1301, second drive plug 14, end cover 15, first air inlet and outlet 1501, support sleeve 16, third sealing ring 1601, second grease groove 1602, fourth sealing ring 1603, sliding bearing 1604, floating gap 17, locking part 18, protective shell 19, limit part 20, shielding part 2001, sensing switch 21, sensing end 2101. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention.

[0027] It should be noted that the diagrams provided in this embodiment are only used to illustrate the basic concept of the present invention. Therefore, the diagrams only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation can be changed at will, and the component layout type may also be more complex. The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read. They are not used to limit the conditions for the implementation of the present invention, so they have no technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the effect and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0028] Before describing this application, the prior art is described. Figure 1 As shown, in order to ensure the sealing of the valve, the volume and size of the actuator are quite large to provide the corresponding sealing force. During on-site installation and layout, it is often impossible to install normally due to environmental restrictions.

[0029] like Figures 1-6 As shown, the present invention provides a program-controlled valve.

[0030] In one exemplary embodiment, a programmable valve comprises:

[0031] A valve body 1, a valve seat 2 is provided in the valve body 1, a first cavity 101 is provided on the valve body 1, and a valve seat 2 is provided in the valve body 1;

[0032] an actuator, disposed on the valve body 1, comprising a valve stem 3, a valve core having a sealing connection with the valve seat 2 provided at a free end of the valve stem 3, a piston 4 provided on the valve stem 3, the piston 4 being located on a side of the valve core away from the valve seat 2 and within the valve body 1, and a second cavity 102 being formed between the piston 4 and the valve body 1;

[0033] The balancing pipe assembly is arranged on the valve body 1 , and the balancing pipe assembly connects the first cavity 101 and the second cavity 102 .

[0034] In this embodiment, by forming a first cavity and a second cavity inside the valve body 1 and providing a balancing pipe assembly, the medium pressure can enter the interior of the valve body 1, and the medium generates pressure on the valve core, thereby reducing the pressure required for the valve to seal, and the thrust on the valve stem 3 is smaller. Accordingly, under the premise of meeting the sealing force, the actuator can be made smaller, thereby facilitating the arrangement of the valve.

[0035] In an exemplary embodiment, the balancing pipe assembly includes a first ferrule 6, a second ferrule 8 and a connecting pipe 7 arranged on the valve body 1, the valve body 1 is provided with a first channel 5 connected to the first cavity 101, the first channel 5 is connected to the first ferrule 6, the valve body 1 is provided with a second channel 9 connected to the second cavity 102, the second channel 9 is connected to the second cavity 102, and the two ends of the connecting pipe 7 are respectively connected to the first ferrule 6 and the second ferrule 8.

[0036] In this embodiment, Figure 3 As shown, the first ferrule 6, the second ferrule 8 and the connecting pipe 7 are provided, so that the first cavity 101 and the second cavity 102 can be effectively connected. After the medium input end of the valve body 1 enters the first cavity 101, it will enter the second cavity 102 through the balancing pipe assembly due to the pressure. At this time, the pressure in the second cavity 102 is the same as the pressure in the first cavity 101. The medium in the second cavity 102 will generate a downward pressure on the piston 4, and the piston 4 will transmit the force to the valve stem 3 and finally to the valve core. Therefore, compared with the valve in the prior art, when the valve core is sealed with the valve seat 2, the lifting force of the medium on the valve core is reduced, thereby being able to reduce the volume of the actuator accordingly.

[0037] For example, the first ferrule 6 and the second ferrule 8 in this embodiment both adopt double-ended ferrule joints, which have stable connections and high sealing properties.

[0038] It is worth mentioning that Figure 5 As shown, a sealing assembly is provided between the piston 4 and the inner wall of the valve body 1 to prevent the medium in the second cavity 102 from entering the medium output end of the valve body 1 and causing valve leakage. The sealing assembly includes a first sealing ring 401, a first grease groove 402 and a second sealing ring 403 arranged in sequence from bottom to top. There are two sealing assemblies, and a polytetrafluoroethylene guide belt 404 is provided between the sealing assemblies. The polytetrafluoroethylene guide belt 404 can guide the piston 4 and reduce the friction between the piston 4 and the valve body 1.

[0039] In an exemplary embodiment, the actuator includes a cylinder body 10, an end cover 15 is provided at one end of the cylinder body 10 away from the valve body 1, a middle cylinder cover 11 is provided in the cylinder body 10, a first driving plug 12 and a second driving plug 14 are provided on both sides of the middle cylinder cover 11, and the second driving plug 14 is abutted against the valve stem 3 at one end close to the cylinder cover.

[0040] In this embodiment, a middle cylinder cover 11 is provided inside the cylinder body 10, so that two large cavities are formed inside the cylinder body 10, and a first driving plug 12 and a second driving plug 14 are respectively provided in the two large cavities. An air inlet and outlet assembly is provided corresponding to each driving plug to realize dual-cylinder power supply. While increasing the driving force, the size of each driving plug can be reduced accordingly, which is conducive to reducing the size of the driving mechanism.

[0041] For example, Figure 6 As shown, a third cavity 1001, a fourth cavity 1002, a fifth cavity 1003 and a sixth cavity 1004 are sequentially provided in the cylinder body 10 from bottom to top. The third cavity 1001 is arranged between the second driving plug 14 and the valve body 1, the fourth cavity 1002 is arranged between the middle cylinder head 11 and the second driving plug 14, the fifth cavity 1003 is arranged between the middle cylinder head 11 and the first driving plug 12, and the sixth cavity 1004 is arranged between the first driving plug 12 and the end cover 15.

[0042] Exemplarily, a first air inlet and outlet 1501 is provided on the end cover 15, and the port of the first air inlet and outlet 1501 faces the sixth cavity 1004; a second air inlet and outlet 1101 is provided on the middle cylinder cover 11, and the port of the second air inlet and outlet 1101 faces the fourth cavity 1002; a third air inlet and outlet 1102 is provided on the middle cylinder cover 11, and the port of the third air inlet and outlet 1102 faces the fifth cavity 1003; a fourth air inlet and outlet 103 is provided on the valve body 1, and the port of the fourth air inlet and outlet 103 faces the third cavity 1001.

[0043] It is worth noting that when the first air inlet and outlet 1501 and the second air inlet and outlet 1101 are inletting air, the third air inlet and outlet 1102 and the fourth air inlet and outlet 103 are exhausted, and the pressurized gas enters the sixth cavity 1004 and the fourth cavity 1002, and the pressurized gas in the third cavity 1001 and the fifth cavity 1003 is discharged synchronously, and the first driving plug 12 moves from the sixth cavity 1004 to the fifth cavity 1003, and the second driving plug 14 moves from the fourth cavity 1002 to the third cavity 1001. At this time, the first driving plug 12 and the second driving plug 14 move downward, pushing the valve stem 3 downward, and the valve is closed; when the third air inlet and outlet 1501 and the second air inlet and outlet 1101 are inletting air, the pressurized gas enters the sixth cavity 1004 and the fourth cavity 1002, and the pressurized gas in the third cavity 1001 and the fifth cavity 1003 is discharged synchronously, and the first driving plug 12 moves from the sixth cavity 1004 to the fifth cavity 1003, and the second driving plug 14 moves from the fourth cavity 1002 to the third cavity 1001. At this time, the first driving plug 12 and the second driving plug 14 move downward, pushing the valve stem 3 downward, and the valve is closed; When air is taken in through the air outlet 1102 and the fourth air inlet and outlet 103, the pressurized gas enters the fifth cavity 1003 and the third cavity 1001, and the pressurized gas in the fourth cavity 1002 and the sixth cavity 1004 is discharged synchronously. The first driving plug 12 moves from the fifth cavity 1003 to the sixth cavity 1004, and the second driving plug 14 moves from the third cavity 1001 to the fourth cavity 1002. At this time, the first driving plug 12 and the second driving plug 14 move upward, and the driving force on the valve stem 3 disappears. The pressure of the medium at the bottom lifts up the valve stem 3, and the upper end face of the valve stem 3 is always in contact with the lower end face of the second driving plug 14.

[0044] It should also be noted that in this embodiment, the first drive plug 12 and the second drive plug 14 are fixedly connected together by a connecting sleeve 13, the connecting sleeve 13 is slidingly connected to the middle cylinder cover 11, and a positioning bearing 1301 is provided between the connecting sleeve 13 and the middle cylinder cover 11 to support the connecting sleeve 13.

[0045] It should also be noted that in this embodiment, while providing the same thrust, the use of a dual-cylinder structure can reduce the diameter of the cylinder body 10 by half, reduce the outer diameter of the entire actuator, make the structure more compact, and reduce the on-site installation space, shortening the user's on-site pipeline layout distance and reducing costs.

[0046] In an exemplary embodiment, the end of the valve stem 3 away from the valve core passes through the first drive plug 12, the middle cylinder cover 11 and the second drive plug 14 and is arranged on the end cover 15. The end cover 15 is provided with a fixing assembly for fixing the valve stem 3.

[0047] In this embodiment, the valve stem 3 is set so that the valve stem 3 can move upward or downward synchronously with the first driving plug 12 and the second driving plug 14, and the fixing component is set so that the valve stem 3 can be installed on the end cover 15 and can move up and down.

[0048] Exemplarily, the fixing assembly includes a support sleeve 16 and a locking member 18. The support sleeve 16 is detachably connected to the end cap 15. The locking member 18 passes through the support sleeve 16 and is detachably connected to the end cap 15. The valve stem 3 passes through the support sleeve 16 and is slidably connected to the support sleeve 16. In this embodiment, a plurality of locking members 18 are provided, which are arranged along the circumference of the support sleeve 16 to facilitate fixing the support sleeve 16 to the end cap 15.

[0049] Exemplarily, the fixing assembly also includes a sliding sealing assembly arranged between the valve stem 3 and the support sleeve 16. The sliding sealing assembly includes a third sealing ring 1601, a second grease groove 1602, a fourth sealing ring 1603 and a sliding bearing 1604 arranged in sequence from top to bottom, which can effectively ensure that the valve stem 3 can move freely following the first driving plug 12 and the second driving plug 14.

[0050] For example, Figure 4 As shown, a floating gap 17 is provided between the support sleeve 16 and the end cap 15. In this embodiment, the valve stem 3 utilizes a monolithic structure. Coaxiality errors are unavoidable during the machining or assembly of related mating parts, increasing the difficulty of valve assembly and affecting the valve leakage level. A floating connection seal is employed between the end cap 15 and the valve stem 3. The floating gap 17 is 0.2-0.4 mm, ensuring automatic alignment during assembly of the end cap 15 and the valve stem 3. This reduces assembly difficulty and prevents misalignment of the valve stem 3 during installation, impacting the valve's service life. In this embodiment, a floating connection can also be employed when connecting the valve core to the valve stem 3. This effectively ensures contact between the valve core and the soft valve seat 2, ensuring the valve's leakage level.

[0051] In an exemplary embodiment, a protective shell 19 is provided on the end cover 15, and a limit member 20 is provided at one end of the valve stem 3 passing through the support sleeve 16. The limit member 20 is arranged along the axial direction of the valve stem 3, and the limit member 20 is provided with a shielding portion 2001. An induction switch 21 is provided on the protective shell 19, and the induction switch 21 is arranged along the radial direction of the valve stem 3. The height of the shielding portion 2001 is greater than the diameter of the induction end 2101 of the induction switch 21.

[0052] In this embodiment, since the limiter 20 is disposed axially along the valve stem 3 and the induction switch 21 is disposed radially along the valve stem 3, when the valve stem 3 is opened, the induction switch 21 senses the limiter 20 and controls the actuator to stop air flow.

[0053] In the prior art, the limit member 20 and the sensing switch 21 are both arranged along the radial direction of the valve stem 3, wherein the limit member 20 is arranged on the valve stem 3, and the sensing switch 21 is arranged on the protective shell 19. When the valve stem 3 rotates during the driving process, when the valve is opened, the sensing switch 21 cannot sense the limit member 20, and cannot accurately transmit the valve opening position to the control center, which can easily cause safety hazards. In this embodiment, the limit member 20 adopts a cylindrical structure. The program-controlled valve generally requires a limited opening position. When the valve is opened, the limit member 20 and the center of the sensor switch 21 are at the same horizontal position, and the sensing distance is maintained at 2.5 to 3 mm. The blocking portion 2001 of the limit member 20 is 1 to 1.5 mm longer than the sensing end 2101 of the sensor switch 21. During the long-term opening and closing process of the valve, even if the push rod position rotates, since the sensor switch 21 is a cylinder, its axial direction is collinear with the axial direction of the valve stem 3, thereby effectively maintaining the distance from the sensor switch 21 unchanged. At the same time, even if the soft valve seat 2 is slightly worn during long-term use, the blocking portion 2001 of the limit member 20 is 1 to 1.5 mm longer than the sensing end 2101 of the sensor switch 21, thereby ensuring that the limit member 20 is always within the sensing range of the sensor switch 21 when the valve is opened, thereby ensuring that the valve opening and closing information is ready to be transmitted to the control center.

[0054] Illustratively, in this embodiment, the limiting member 20 is connected to the top of the valve stem 3 by means of threads.

[0055] For example, the limit member 20 in this embodiment is mainly used to limit the open position of the valve. If the closed position is required, the valve is in the closed position when the sensing switch 21 is aligned with the limit position. If both the closed position and the open position need to be controlled, two sensing switches 21 are installed in the valve open and closed positions respectively, to meet the user's various production safety control needs.

[0056] To sum up, the present invention adopts a balanced sealing method to reduce the sealing force when the valve is sealed, and adopts a dual-cylinder drive method to reduce the volume and size of the actuator, which is beneficial to on-site layout. At the same time, it changes the position of the limit member 20 and the sensing switch 21, effectively avoiding the inability of the sensing switch 21 to accurately sense the position of the limit member 20.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A program-controlled valve, characterized in that: include: a valve body, wherein a valve seat is provided in the valve body; An actuator is provided on the valve body, the actuator comprising a cylinder body, an end cover and a valve stem, the end cover being provided at an end of the cylinder body away from the valve body; A fixing assembly is arranged on the end cover, and the fixing assembly is used to position the valve stem. The fixing assembly includes a support sleeve and a sliding sealing assembly. The sliding sealing assembly is arranged between the valve stem and the support sleeve and is used for the valve stem to slide along its own axial direction. The support sleeve is floatingly connected to the end cover.

2. A program-controlled valve according to claim 1, characterized in that: The sliding sealing assembly includes a third sealing ring, a second grease groove, a fourth sealing ring and a sliding bearing arranged in sequence from top to bottom. The third sealing ring, the second grease groove and the fourth sealing ring are all arranged between the support sleeve and the valve stem. The sliding bearing is arranged on the support sleeve and is sleeved on the valve stem.

3. A program-controlled valve according to claim 2, characterized in that: There is a floating gap between the support sleeve and the end cover, and the floating gap is 0.2mm to 0.4mm.

4. A program-controlled valve according to claim 2, characterized in that: A protective shell is provided on the end cover, and a limiter is provided at one end of the valve stem passing through the support sleeve. The limiter is arranged along the axial direction of the valve stem, and the limiter is provided with a shielding portion. At least one induction switch is provided on the protective shell, and the induction switch is arranged along the radial direction of the valve stem. The height of the shielding portion is greater than the diameter of the induction end of the induction switch.

5. A program-controlled valve according to claim 2, characterized in that: A plurality of locking members are provided along the circumference of the support sleeve, and the locking members pass through the support sleeve and are threadedly connected to the end cover.

6. A program-controlled valve according to claim 2, characterized in that: The free end of the valve stem is provided with a valve core that can be used for sealing connection with the valve seat. The valve stem is provided with a piston. The piston is located on the side of the valve core away from the valve seat and is located in the valve body. A second cavity is formed between the piston and the valve body. The valve body is provided with a balancing pipe assembly for connecting the first cavity and the second cavity.

7. A program-controlled valve according to claim 6, characterized in that: A middle cylinder cover is provided in the cylinder body, and a first driving plug and a second driving plug are respectively provided on both sides of the middle cylinder cover. A third cavity, a fourth cavity, a fifth cavity and a sixth cavity are sequentially provided in the cylinder body from bottom to top. The third cavity is arranged between the second driving plug and the valve body, the fourth cavity is arranged between the middle cylinder cover and the second driving plug, the fifth cavity is arranged between the middle cylinder cover and the first driving plug, and the sixth cavity is arranged between the first driving plug and the end cover.

8. A program-controlled valve according to claim 7, characterized in that: The end cover is provided with a first air inlet and outlet, and the port of the first air inlet and outlet faces the sixth cavity; the middle cylinder cover is provided with a second air inlet and outlet, and the port of the second air inlet and outlet faces the fourth cavity; the middle cylinder cover is provided with a third air inlet and outlet, and the port of the third air inlet and outlet faces the fifth cavity; the valve body is provided with a fourth air inlet and outlet, and the port of the fourth air inlet and outlet faces the third cavity.

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