A control structure of a hydraulic balance regulating valve cover

Abstract

The present application relates to the field of control valves, and specifically to a control structure of a hydraulically balanced regulating valve cover, which is used for convenient adjustment of the hydraulically balanced regulating valve cover, and includes a valve cover for providing overall installation and support, wherein: an adjusting rod for adjusting the hydraulic balance is provided in a cavity inside the valve cover, and a first inlet and a second inlet are respectively connected on both sides of the cavity, and fluid is input into the cavity of the valve cover along the first inlet and the second inlet to control the position of the adjusting rod; it has a simple structure, and the upper and lower ends of the adjusting rod are respectively connected to the fluid, and the outward thrust of the adjusting rod is offset by the fluid to reduce the thread friction at the adjusting screw, thereby avoiding the effect of the situation in the prior art where the pressure at the adjusting rod is relatively high and it is inconvenient to adjust.

Description

Technical Field

[0001] The present application relates to the field of control valves, and in particular to a control structure of a hydraulically balanced regulating valve cover, which is used for convenient adjustment of the hydraulically balanced regulating valve cover. Background Art

[0002] In the prior art:

[0003] For example: Chinese Patent Publication (Announcement) No.: CN103671943A; The present invention relates to a balanced multi-stage regulating valve, comprising a valve body, an end flange, a valve seat, a valve disc, a valve cover, a bracket and a valve stem, wherein a valve stem nut is built in the bracket, the lower part of the valve stem is connected to the top of the valve disc, and a manipulation handle is provided on the top. The special feature of the valve body is that an inner sleeve, a middle sleeve and an outer sleeve are sequentially arranged in the valve body, and the inner sleeve and the middle sleeve are correspondingly provided with upper, middle and lower overflow holes, the upper overflow hole and the lower overflow hole are respectively multi-stage holes, and the outer sleeve is provided with an overflow hole corresponding to the upper overflow hole of the middle sleeve, an annular groove A connected with the overflow hole of the inner sleeve is provided on the valve disc, an annular groove B connected with the lower overflow hole and the middle overflow hole thereof and an annular groove C connected with the upper overflow hole thereof and the overflow hole of the outer sleeve are provided on the outer wall of the valve body, and an annular groove D connected with the overflow hole of the outer sleeve and the liquid outlet of the valve body is provided on the inner surface of the valve body. It solves the problem of multi-stage regulation of existing regulating valves and has the advantages of flexible opening and closing, easy operation, high density and strength, and safety and reliability.

[0004] The balancing valve in this application adopts a multi-stage adjustment method. However, when the oil pressure in the pipeline is too high during actual use, the rotation pressure of the adjustment part is relatively large, which makes it difficult to adjust.

[0005] Another example: Chinese Patent Publication (Announcement) No.: CN103912691A; a balanced regulating valve, comprising a valve body, a valve seat, an adjusting sleeve, a piston-type regulating valve core, a pressure ring, a lifting shaft, a valve cover sealed and connected to the upper end of the valve body and a hand wheel at the upper end of the lifting shaft, the valve body is provided with a longitudinal medium inlet and a transverse medium outlet, the medium inlet and the medium outlet are connected by a valve cavity in the valve body, the valve seat, the adjusting sleeve, the regulating valve core, and the pressure ring are all arranged in the valve cavity, the valve seat is connected to the bottom end of the valve cavity, the adjusting sleeve is connected to the upper end of the valve seat, the regulating valve core is arranged in the adjusting sleeve corresponding to the valve seat, a plurality of through holes are evenly arranged at different heights on the side wall of the regulating sleeve, the pressure ring is arranged between the valve cover and the adjusting sleeve, the regulating valve core is provided with a balancing hole, a cavity formed between the valve cover and the pressure ring and the regulating valve core, the medium inlet is connected to the cavity through the balancing hole, and the lower end of the lifting shaft is connected to the regulating valve core. The device has a reasonable structure and is easy to assemble. It saves more effort to open the valve, has low vibration and noise of the valve core, and has more reliable sealing.

[0006] The balancing valve in this application solves the vibration and sealing problems. However, in actual use, the oil pressure in the pipeline is still too high and the rotational pressure in the adjustment part is still relatively large, making it inconvenient to adjust.

[0007] The above patent applications have different technical solution purposes and technical problems to be solved, which leads to differences in their technical solutions including structures and methods. They cannot be simply combined for the present patent application, otherwise it will lead to more complicated structural design or inability to implement, etc.

[0008] In view of this, how to design a control structure of a force-balanced regulating valve cover to overcome the defects existing in the above-mentioned prior art is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0009] The purpose of the present application is to overcome the technical problems existing in the prior art and to provide a control structure of a force-balanced regulating valve cover.

[0010] The purpose of the present application is achieved through the following technical solution: a control structure of a hydraulically balanced regulating valve cover, including a valve cover for providing overall installation and support, wherein: an adjusting rod for adjusting the hydraulic balance is provided in a cavity inside the valve cover, and a first inlet and a second inlet are respectively connected on both sides of the cavity, and fluid is input into the cavity of the valve cover along the first inlet and the second inlet to offset the thrust exerted on the adjusting rod.

[0011] The valve cover is provided with a first communicating hole communicating with the cavity and the first inlet, and a second communicating hole communicating with the cavity and the second inlet.

[0012] The regulating rod in the valve cover is divided into four sections b, c, d, and e, wherein the cross sections of sections c and d form pistons in cavities (t1) and (t2), respectively, wherein the first inlet and the second inlet are connected to the cavities on both sides of the piston, respectively.

[0013] The fluid pressure in the first inlet (a1) is equal to the fluid pressure in the second inlet (a2), but the cross-sectional area Sd of the d section is slightly larger than the annular area Scb of the c section = Sc-Sb, so the thrust difference between the two generates an upward thrust, pushing the adjustment rod (5) upward to ensure that the adjustment rod is in the uppermost position.

[0014] A third communicating hole is connected between the first inlet and the second inlet.

[0015] The third communicating hole is arranged on the valve cover, an inlet for inputting fluid is arranged on the outer wall of the valve cover, and a fourth communicating hole connecting the inlet and the third communicating hole is also arranged on the valve cover.

[0016] A first working surface (Scb) is formed at the intersection of section b and section c of the adjusting rod (5), and a second working surface (Sd) is formed at the position of the cross-sectional area of ​​section d. The area of ​​the first working surface (Scb) is slightly smaller than that of the second working surface (Sd).

[0017] The cavity comprises a first cavity, a second cavity and a third cavity which are sequentially connected and arranged, the first inlet is connected to the third cavity, and the second inlet is connected to the first cavity.

[0018] The valve cover is provided with a pressure cover for sealing the installation position of the regulating rod.

[0019] The gland is provided with a screw rod for contacting the top end of the adjusting rod.

[0020] The contact form between the bottom end of the screw rod and the top end of the adjusting rod is point contact.

[0021] The bottom end of the screw rod is an arc surface protruding outwards, and the top end of the adjusting rod is a plane or an arc surface protruding outwards.

[0022] The top end of the screw rod is provided with a hand wheel for adjusting the rotation thereof.

[0023] A nut is provided at the position where the screw rod meets the outer side wall of the gland.

[0024] Compared with the prior art, this application has at least the following obvious advantages and effects:

[0025] 1. A simple structure is adopted to connect the upper and lower ends of the adjusting rod to the fluid respectively, so that the upward thrust of the adjusting rod is offset by the fluid, thereby avoiding the situation in the prior art where the pressure at the adjusting rod is high and the adjustment is inconvenient.

[0026] 2. The valve cover in this structure adopts an integrated design, which is convenient for material selection, easy to produce and manufacture, low in cost and easy to popularize.

[0027] 3. Greatly reduce the friction between the thread of the gland and the screw, adopt point contact method, greatly reduce the friction between the bottom of the screw and the top of the adjusting rod, and improve the convenience of handwheel rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0029] Figure 1 This is a schematic diagram of the overall structure of this application.

[0030] Figure 2 This is a working principle diagram of this application.

[0031] Names in the attached drawings:

[0032] DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0034] A control structure of a hydraulically balanced regulating valve cover described in the present application includes a valve cover 6 for providing overall installation and support, wherein: an adjusting rod 5 for adjusting the hydraulic balance is provided in a cavity t inside the valve cover 6, and a first inlet a1 and a second inlet a2 are respectively connected on both sides of the cavity t, and fluid is input into the cavity t of the valve cover 6 along the first inlet a1 and the second inlet a2 to offset part of the upward thrust of the adjusting rod 5; it has a simple structure, and the upper and lower ends of the adjusting rod are connected to the fluid respectively, so as to realize a convenient fluid adjustment method, thereby avoiding the effect of the situation in the prior art where the pressure at the adjusting rod is relatively high and it is inconvenient to adjust.

[0035] In the present application examples, see Figure 1 to Figure 2 As shown in the figure, the fluid in the application uses pressure oil to work; when the pilot pressure oil of the P port is electrically controlled through the pilot valve D10, the pilot pressure oil flows into the inlet a from the P port of the pilot valve D10 and then enters the first inlet a1 and the second inlet a2 in two ways, wherein the first inlet a1 acts on the third cavity t3 in the lower part of the cavity t.

[0036] The second inlet a2 controls the first working surface area Scb formed by the annular area at the upper end of the adjusting rod 5 , and the force acting on the adjusting rod 5 forms a first downward thrust Fcb.

[0037] The adjusting rod 5 is pushed along the second working surface area Sd at the lower side thereof, and the force of the pressure oil acting on the adjusting rod 5 forms a second thrust Fd upward.

[0038] At this time, section c in the middle position of the adjusting rod 5 forms a piston structure in the cavity t, and a fitting sliding is formed between section c and the first cavity t1. The second working surface area Sd formed at the lower part of the adjusting rod 5 is designed to be slightly larger than the first working surface area Scb at the upper part, that is, Fd is slightly larger than Fcb, that is, the combined force of Fd and Fcb is upward and is much smaller than the original force Fd, thereby greatly reducing the contact surface pressure between the top end of the adjusting rod 5 and the bottom end of the screw 2, and the friction force transmitted from the adjusting rod 5 to the screw 2 and the thread is also reduced at the same time. The reduction in pressure reduces the friction force, and the reduction in contact surface also reduces the friction between the two, and the contact between the two is set to the form of point contact.

[0039] Comparison with prior art embodiments:

[0040] Prior art: When the pilot pressure oil pressure value is at 150 bar at the same time, the torque required for adjustment of the adjustment structure in the prior art is measured to be above 55 Nm, and it is impossible to adjust it by directly adjusting the adjustment hand wheel 1 manually; when adjusting on the current adjustment structure, the required torque is measured to be between 7-8 Nm, and it is very easy to manually adjust the adjustment hand wheel 1.

[0041] When the pilot pressure oil at port P is electrically controlled via the pilot valve D10, the pilot pressure oil is in a closed state at port P of the pilot valve D10, and the cavity t of the valve cover, the lower first inlet a1 and the upper second inlet a2 of the adjusting rod 5 are all connected to the inlet a of the pilot valve D10. At this time, a T-shaped structure of a reflux port is formed in the pilot valve D10, and the pressure oil in cavity t flows into the inlet a through the second inlet a2 and the first inlet a1 and flows back to the oil tank, so that the valve core at the lower side of the adjusting rod 5 is in an open state, and the adjusting rod 5 is maintained at the upper part of the cavity t, so that the opening response of the valve core by the adjusting rod 5 has no delayed effect.

[0042] In another embodiment of the present application, a control structure of a hydraulically balanced regulating valve cover includes a valve cover 6 for providing overall installation and support, wherein: an adjusting rod 5 for adjusting the hydraulic balance is provided in a cavity t inside the valve cover 6, and a first inlet a1 and a second inlet a2 are respectively connected on both sides of the cavity t, and an oil inlet or an air inlet is respectively provided at the upper and lower ends of the valve cover 6, and the thrust of the adjusting rod 5 with piston-like motion in the cavity t can be offset by utilizing the area difference between the first inlet a1 and the second inlet a2.

[0043] The cavity t is not shown in the figure. The cavity is a cavity in the valve cover 6 and is composed of a first cavity t1 , a second cavity t2 , and a third cavity t3 .

[0044] The fluid is input into the cavity t of the valve cover 6 along the first inlet a1 and the second inlet a2 to control the position of the regulating rod 5 . The thrust of the piston regulating rod 5 in the valve cover 6 can be offset by compressed gas, water or grease.

[0045] The valve cover 6 is provided with a first communicating hole 61 communicating with the cavity t and the first inlet a1 , and a second communicating hole 62 communicating with the cavity t and the second inlet a2 .

[0046] Two through holes, namely a first communicating hole 61 and a second communicating hole 62, are drilled on the valve cover 6. The first communicating hole 61 is used to transport the fluid of the first inlet a1 to the lower part of the cavity t, and the second communicating hole 62 is used to transport the fluid of the second inlet a2 to the upper part of the cavity t. The structure of the valve cover 6 itself is fully utilized to design a method for controlling the adjusting rod 5, thereby reducing production costs.

[0047] The regulating rod 5 in the valve cover 6 is divided into four sections: b, c, d, and e.

[0048] b is the first section structure at the top end of the adjusting rod 5 , c is the second section structure at the upper middle position of the adjusting rod 5 , d is the third section structure at the lower middle position of the adjusting rod 5 , and e is the fourth section structure at the bottom end of the adjusting rod 5 .

[0049] Among them, a segmented design is adopted to set the adjustment rod 5 into different segments to form different functions. The structure between the segments is used to form an up and down adjustment effect of the piston. The different diameters between each other are used to form a step structure. The sizes of the steps are different to form working surfaces of different sizes.

[0050] The cross section of segment c forms a piston in cavity t, and the structure of the piston is used to ensure that it can slide up and down.

[0051] The first inlet a1 and the second inlet a2 are connected to the cavities t on both sides of the piston respectively, and push the piston along both sides to move up and down in the cavity t.

[0052] A piston sealing structure is formed between the c section of the adjusting rod 5 and the side wall of the valve cover 6. A sealing ring is arranged along the c section of the adjusting rod 5 to improve the sealing performance of the piston. The smooth side wall of the valve cover 6 surrounds the sealing ring of the c section, thereby forming a stable sealing effect.

[0053] The fluid pressure in the first inlet (a1) is equal to the fluid pressure in the second inlet (a2), but the cross-sectional area Sd of the d section is slightly larger than the annular area Scb of the c section = Sc-Sb, so the thrust difference between the two generates an upward thrust, pushing the adjustment rod (5) upward to ensure that the adjustment rod is in the uppermost position.

[0054] That is, the first inlet a1 and the second inlet a2 are connected via the third connecting hole 63 , so that the pressures of the two are equalized, and different working surface areas are designed and formed.

[0055] The third connecting hole 63 is provided on the valve cover 6 , an inlet a for inputting fluid is provided on the outer wall of the valve cover 6 , and a fourth connecting hole 64 connecting the inlet a and the third connecting hole 63 is also provided on the valve cover 6 .

[0056] A first working surface Scb is formed at the intersection of segment b and segment c of the adjusting rod 5, and the first working surface Scb receives the fluid pressure at the second inlet a2. A second working surface Sd is formed at the intersection of segment d and segment e, and the second working surface Sd receives the fluid pressure at the first inlet a1. The area of ​​the first working surface Scb is smaller than the area of ​​the second working surface Sd. At this time, the same pressure but different working areas cause the adjusting rod 5 to move upward and stay at the top of the cavity t. When the adjusting rod 5 is adjusted and switched, the adjusting rod 5 will not vibrate up and down.

[0057] The cavity t includes a first cavity t1, a second cavity t2, and a third cavity t3 which are sequentially connected and arranged, the first inlet a1 is connected to the third cavity t3, and the second inlet a2 is connected to the first cavity t1.

[0058] The valve cover 6 is provided with a pressure cap 4 for closing the installation position of the regulating rod 5. The top of the valve cover 6 is closed by the pressure cap 4, and the space at the top of the regulating rod 5 is closed by the pressure cap 4 to ensure that the regulating rod 5 can run stably in the cavity t.

[0059] The gland 4 is provided with a screw rod 2 for contacting the top end of the adjusting rod 5. The screw rod 2 is provided in the gland 4, and the screw rod 2 cooperates with the thread at the middle position of the gland 4 to realize the rotation adjustment of the adjusting rod 5.

[0060] The contact form between the bottom end of the screw rod 2 and the top end of the adjusting rod 5 is point contact. By adopting the point contact mode, the contact area between the top end of the adjusting rod 5 and the bottom end of the screw rod 2 can be reduced as much as possible, and the convenience of the screw rod 2 rotation can be improved.

[0061] The bottom end of the screw rod 2 is an arc surface protruding outward, and the top end of the adjusting rod 5 is a plane or an arc surface protruding outward. The arc-shaped structure is set to form a point contact surface at the bottom end of the screw rod 2, which fully reduces the friction coefficient between the top end of the adjusting rod 5 and the bottom end of the screw rod 2.

[0062] A hand wheel 1 for adjusting the rotation of the screw rod 2 is disposed at the top end thereof, and the hand wheel 1 is used to adjust the position of the screw rod 2 by rotation.

[0063] A nut 3 is provided at the intersection of the screw rod 2 and the outer wall of the pressure cover 4. The nut 3 cooperates with the screw rod 2. After the screw rod 2 is adjusted, it is locked by the nut 3.

[0064] The above is only an embodiment of the present application, and the names of the parts in the present application may be different, and the names in the present application are not limited. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the concept and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A control structure of a hydraulically balanced regulating valve cover, comprising a valve cover (6) for providing overall installation and support, characterized in that: An adjusting rod (5) for adjusting hydraulic balance is provided in the cavity (t) inside the valve cover (6), and a first inlet (a1) and a second inlet (a2) are provided on both sides of the cavity (t), and fluid is input into the cavity (t) of the valve cover (6) along the first inlet (a1) and the second inlet (a2) to control the outward thrust of the adjusting rod (5); The cavity (t) comprises a first cavity (t1), a second cavity (t2), and a third cavity (t3) which are sequentially connected and arranged, the first inlet (a1) is connected to the third cavity (t3), and the second inlet (a2) is connected to the first cavity (t1); The regulating rod (5) in the valve cover (6) is divided into four sections, b, c, d, and e, wherein b is a first section structure at the top end of the regulating rod (5), c is a second section structure at the middle and upper position of the regulating rod (5), d is a third section structure at the middle and lower position of the regulating rod (5), and e is a fourth section structure at the bottom end of the regulating rod (5), and the cross sections of sections c and d form pistons in the first cavity (t1) and the second cavity (t2), respectively, wherein the second inlet (a2) is connected to the cavity on the upper side of the piston of section c, and the first inlet (a1) is connected to the cavity on the lower side of the piston of section d; The fluid pressure in the first inlet (a1) is equal to the fluid pressure in the second inlet (a2); a first working surface Scb is formed at the intersection of the b section and the c section of the adjusting rod (5); the first working surface Scb receives the fluid pressure at the second inlet (a2); a second working surface Sde is formed at the intersection of the d section and the e section; the second working surface Sde receives the fluid pressure at the first inlet (a1); the area of ​​the second working surface Sde is greater than the area of ​​the first working surface Scb; the difference in area between the first working surface and the second working surface causes the adjusting rod (5) to be subjected to an upward thrust; The valve cover (6) is provided with a pressure cover (4) for sealing the installation position of the regulating rod (5). The top of the valve cover (6) is sealed by the pressure cover (4), and the space at the top of the regulating rod (5) is sealed by the pressure cover (4), so as to ensure that the regulating rod (5) can run stably in the cavity (t); The gland (4) is provided with a screw (2) for contacting the top end of the adjustment rod (5), and the screw (2) cooperates with a thread at the middle position of the gland (4); A hand wheel (1) for adjusting the rotation of the screw rod (2) is provided at the top end of the screw rod (2), and the hand wheel (1) is used to rotationally adjust the position of the screw rod (2).

2. The control structure of the hydraulic balance regulating valve cover according to claim 1 is characterized in that: The valve cover (6) is provided with a first communication hole (61) communicating with the third cavity (t3) and the first inlet (a1), and a second communication hole (62) communicating with the first cavity (t1) and the second inlet (a2).

3. The control structure of the hydraulic balance regulating valve cover according to claim 2 is characterized in that: A third connecting hole (63) is connected between the first inlet (a1) and the second inlet (a2).

4. The control structure of the hydraulic balance regulating valve cover according to claim 3 is characterized in that: The third connecting hole (63) is arranged on the valve cover (6), an inlet (a) for inputting fluid is arranged on the outer wall of the valve cover (6), and a fourth connecting hole (64) connecting the inlet (a) and the third connecting hole (63) is also arranged on the valve cover (6).

Images