Labyrinth type oil filling valve and leather bag type energy accumulator

Abstract

The invention provides a labyrinth type oil filling valve and a leather bag type energy accumulator, the labyrinth type oil filling valve comprises a valve shell and a valve body, the valve body comprises a valve plate assembly and a sealing assembly, the valve plate assembly comprises a valve plate group formed by a plurality of pressure reducing valve plates which are arranged in a stacked mode, and the end face of each pressure reducing valve plate is provided with a plurality of labyrinth type oil ways; the sealing assembly comprises a sealing sleeve and a V-shaped ring sealing structure, the valve rod is sleeved with the sealing sleeve, and the sealing sleeve is sealed through the V-shaped ring sealing structure. During oil filling, control oil enters the oil storage cavity through the oil filling port to be cached and then flows to the oil outlet through the labyrinth type oil ways of the pressure reducing valve plates, the actual use number of the pressure reducing valve plates can be controlled by controlling the axial movement of the valve rod, the oil amount of the control oil flowing to the oil outlet can be changed, and the oil filling flow can be accurately adjusted. And the pressure of the control oil can be reduced by the labyrinth oil way, namely, the pressure of the control oil entering the energy accumulator is reduced, and the impact on parts such as a mushroom valve in the energy accumulator and the influence on the oil pressure of the system can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of accumulators, and in particular to a labyrinth oil charging valve and a bladder accumulator. Background Art

[0002] At present, the petroleum, electric power, and chemical industries are developing rapidly, and industrial steam turbines are developing in the direction of high speed, high power, and low energy consumption. Accumulators are widely used in the control oil and other systems of industrial steam turbines. Generally, they are bladder accumulators equipped with a constant pressure system, which can absorb pressure pulsation of the control oil system and maintain constant pressure, prevent turbine control oil fluctuations from causing turbine shutdown, and extend the turbine operation cycle. With the extension of the turbine operation cycle, the internal bladder of the accumulator is often damaged, so it is necessary to replace the bladder inside the accumulator without stopping the machine. When the accumulator is put into use again, the accumulator system is pressurized through the oil filling valve. During the charging process, the oil pressure of the control oil and other systems fluctuates, causing the turbine to shut down.

[0003] Therefore, in order to avoid affecting the system oil pressure of the turbine control oil system when checking and replacing the accumulator, causing the turbine to shut down, thereby affecting the long-term safe operation of the industrial steam turbine, it is necessary to design a labyrinth oil charging valve and a bladder accumulator to solve the problem of affecting the system oil pressure when checking and replacing the accumulator. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a labyrinth oil charging valve and a bladder accumulator. The labyrinth oil charging valve can be used to quickly release and slowly charge the oil inside the accumulator. When the accumulator is put into use, the oil pressure and flow rate of the filling oil can be accurately controlled to ensure the stability of the system oil pressure.

[0005] In order to achieve the above-mentioned object and other related objects, the present invention provides a labyrinth oil filling valve, comprising a valve housing and a valve body, wherein the valve body is installed in the valve housing, and the valve body comprises:

[0006] A valve plate assembly, the valve plate assembly comprising a valve plate group formed by a plurality of pressure reducing valve plates arranged in a stacked manner, wherein a plurality of labyrinth oil passages are provided on the end surface of each pressure reducing valve plate;

[0007] A valve stem assembly, the valve stem assembly comprises a valve stem and a valve stem mounting bracket, a first end of the valve stem is mounted on the valve stem mounting bracket, and a valve plate assembly is sleeved on the second end of the valve stem;

[0008] The sealing assembly includes a sealing sleeve and a V-ring sealing structure. The V-ring sealing structure is arranged in the sealing sleeve. The sealing sleeve is arranged on the valve stem and is sealed by the V-ring sealing structure. The sealing sleeve and the valve housing are sealed by the sealing ring.

[0009] The clearance between the valve plate assembly and the valve housing forms an oil storage cavity, the valve housing and the valve plate assembly are provided with oil filling ports correspondingly, and the second end of the valve stem is provided with an oil outlet correspondingly.

[0010] As one embodiment of the present invention, an oil inlet hole is opened in the center of each pressure reducing valve plate, the first end of each labyrinth oil circuit is connected to the oil inlet hole, and the second end is connected to the oil storage chamber. The labyrinth oil circuit is formed by connecting the end to the end of the Z-shaped bent oil channel, and the width of the Z-shaped bent oil channel corresponding to the first end to the second end of the labyrinth oil circuit gradually increases.

[0011] As one embodiment of the present invention, the valve plate assembly also includes a front cover plate and a rear cover plate, both of which are circular orifice plates and are respectively stacked on the two ends of the valve plate group; the pin passes through the front cover plate, the valve plate group and the rear cover plate in sequence, and its two ends are respectively fixed by shaft retaining springs.

[0012] As one embodiment of the present invention, it also includes a pressure relief ring, which is arranged on the valve stem between the valve plate assembly and the sealing sleeve and is connected to the sealing sleeve. The pressure relief ring forms a seal with the corresponding valve housing through the sealing ring.

[0013] As one embodiment of the present invention, a V-ring sealing structure includes an elastic element, a support ring and a plurality of V-rings; the sealing sleeve is a straight-mouth step sleeve, a small hole end face of the step hole is provided with a V-shaped groove, a plurality of V-rings are stacked and arranged in a large hole to form a V-ring group, and the support ring elastically rests against one end of the V-ring group through the elastic element, so that the other end of the V-ring group and the V-shaped groove fit tightly.

[0014] As one embodiment of the present invention, the elastic element includes a hole-use retaining spring, a spring seat plate and a compression spring. The spring seat plate is correspondingly arranged at one end of the support ring through the hole-use retaining spring, and the compression spring is installed between the spring seat plate and the support ring.

[0015] As one of the embodiments of the present invention, it also includes a sealing cover, which is a straight-mouth stepped circular hole structure, and the outer edge of the circular hole is a protruding step portion. The sealing cover is sleeved on the valve stem at the end corresponding to the sealing sleeve and the valve stem mounting bracket, and is respectively connected to the sealing sleeve and the valve housing.

[0016] As one embodiment of the present invention, the valve stem mounting bracket is a straight-mouthed stepped gland, a valve stem nut is inserted into a small hole thereof, a first end of the valve stem is threadedly matched with the valve stem nut and extends out of the valve stem mounting bracket, an indicating mechanism is provided at the extended portion, a protective sleeve is provided at the outer cover of the indicating mechanism, and a hand wheel is provided at the extended end of the valve stem through a retaining spring;

[0017] The indicating mechanism comprises an indicating needle, a valve stem indicating plate and a valve stem indicating nut. The valve stem indicating nut is connected to the valve stem, the indicating needle is installed on the valve stem nut, the valve stem indicating plate is connected to the protective cover, and the pointer end of the indicating needle points to the valve stem indicating plate.

[0018] To achieve the above-mentioned purpose and other related purposes, the present invention also provides a bladder accumulator, including an accumulator body, a valve body seat and an oil inlet valve group, the oil inlet valve group includes a main oil ball valve and a main valve shell, the main valve shell is provided with a main flow channel, the main oil ball valve is installed on the main flow channel, the valve body seat is installed at the bottom of the accumulator body, and is used to connect the main flow channel and the accumulator body, and also includes a labyrinth oil filling valve, the main valve shell is also provided with a first bypass flow channel and a second bypass flow channel, the first bypass flow channel and the second bypass flow channel are respectively connected to the main flow channel, the oil outlet of the labyrinth oil filling valve is connected to the first bypass flow channel, the oil filling port of the labyrinth oil filling valve is connected to the second bypass flow channel, and an oil filling ball valve is installed on the second bypass flow channel.

[0019] As one of the embodiments of the present invention, a mounting sink is provided in the flow channel of the valve body seat, a mushroom-shaped valve is installed on the mounting sink, an overflow hole is opened on the mounting sink, the overflow pipe is inserted in the overflow hole, and a distance is provided between the protruding end thereof and the bottom of the valve cover of the mushroom-shaped valve, the bottom of the overflow hole horizontally penetrates the valve body seat through the drainage hole, and the drainage hole is connected to a side ball valve through a short-circuit connection, and a reflux indicator is connected to the side ball valve.

[0020] The present invention at least includes the following beneficial technical effects:

[0021] (1) The valve plate assembly of a labyrinth oil filling valve of the present invention includes a valve plate group formed by a plurality of pressure reducing valve plates arranged in a stacked manner, and a plurality of labyrinth oil circuits are provided on the end surface of each pressure reducing valve plate, and the gap between the valve plate assembly and the valve housing is matched to form an oil storage chamber. When filling the oil, the control oil enters the oil storage chamber through the oil filling port for buffering, and then flows to the oil outlet through the labyrinth oil circuit of the pressure reducing valve plate. By controlling the axial movement of the valve stem, the actual number of pressure reducing valve plates used can be controlled to change the amount of control oil to the oil outlet, and the filling flow rate can be precisely adjusted. In addition, the control oil needs to enter through the labyrinth oil circuit to reduce the pressure of the control oil, that is, to reduce the pressure of the control oil entering the accumulator, so that the accumulator is charged smoothly, and the impact on the system oil pressure is minimized. At the same time, the reduction in the pressure of the control oil can reduce the impact on the mushroom valve and other components inside the accumulator, thereby extending the operating life of the accumulator.

[0022] (2) A bladder accumulator of the present invention closes the oil filling ball valve and opens the main oil ball valve when draining the oil, and the oil in the accumulator body is discharged through the main flow channel. When filling the oil, close the main oil ball valve and open the oil filling ball valve. The control oil passes through the second bypass flow channel to reach the filling port of the labyrinth filling valve, enters the oil storage chamber of the labyrinth filling valve through the filling port, and passes through the valve plate assembly to the oil outlet. The control oil flowing out of the oil outlet passes through the first bypass flow channel to the main flow channel and finally to the accumulator body. Therefore, the slow charging and fast discharging control process of the accumulator control oil can be realized. When the accumulator is put into use again, the accumulator system is pressurized through the labyrinth filling valve without shutting down the machine, so as to accurately control the oil pressure and flow rate when the system is filled with oil, and avoid the influence of oil pressure fluctuations on the system oil pressure during the charging process, and even cause shutdown. Ensure the safety of system operation.

[0023] (3) When the bladder accumulator of the present invention starts to be filled with oil, the air in the valve body seat and the oil filling valve can be discharged through the overflow pipe, thereby further improving the stability of the operation of the accumulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the valve body structure of a labyrinth type oil charging valve provided in one embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the structure of a pressure reducing valve plate of a labyrinth oil charging valve provided in one embodiment of the present invention;

[0027] Figure 3 A schematic diagram of a valve housing structure of a labyrinth type oil charging valve provided in one embodiment of the present invention;

[0028] Figure 4 A schematic structural diagram of a bladder accumulator provided in one embodiment of the present invention;

[0029] Figure 5 A schematic diagram of a valve body seat structure of a bladder accumulator provided in one embodiment of the present invention;

[0030] Figure 6 A schematic diagram of a bladder accumulator during oil filling provided by an embodiment of the present invention.

[0031] Among them, valve housing 1, valve body 2, valve disc assembly 21, pressure reducing valve disc 211, labyrinth oil circuit 2110, oil inlet hole 2111, front cover plate 212, rear cover plate 213, pin 214, valve stem assembly 22, valve stem 221, valve stem mounting bracket 222, valve stem nut 223, protective cover 224, hand wheel 225, indicator needle 226, valve stem indicator plate 227, valve stem indicator nut 228, sealing assembly 23, sealing sleeve 231, 2311 sealing ring, elastic element 232, support ring 23 3. V-ring 234, hole retaining ring 2321, spring seat plate 2322, compression spring 2323, pressure reducing ring 24, sealing gland 25, accumulator body 3, valve body seat 4, mounting sink 41, overflow hole 411, bypass ball valve 412, 413 reflux indicator, main oil ball valve 51, main valve housing 52, main flow channel 521, first bypass flow channel 522, second bypass flow channel 523, labyrinth oil charging valve 53, oil outlet 531, oil charging port 532, oil charging ball valve 54, mushroom valve 6, overflow pipe 7. DETAILED DESCRIPTION

[0032] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0033] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention in a schematic manner, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0034] See also Figure 1 and Figure 3The present invention provides a labyrinth oil-filling valve, comprising a valve housing 1 and a valve body 2, wherein the valve body 2 is installed in the valve housing 1, and the valve body 2 comprises a valve plate assembly 21, a valve stem assembly 22 and a sealing assembly 23, wherein the valve plate assembly 21 comprises a valve plate group formed by a plurality of pressure-reducing valve plates 211 arranged in a stacked manner, wherein a plurality of labyrinth oil passages 2110 are provided on the end surface of each pressure-reducing valve plate 211; the valve stem assembly 22 comprises a valve stem 221 and a valve stem mounting bracket 222, wherein a first end of the valve stem 221 is mounted on the valve stem mounting bracket 222, and a second end of the valve stem 221 is sleeved with the valve plate assembly 21; the sealing assembly 23 comprises a sealing sleeve 231 and a V-ring sealing structure, wherein the V-ring sealing structure is arranged in the sealing sleeve 231, the sealing sleeve 231 is sleeved on the valve stem 221, and is sealed by the V-ring sealing structure, and the sealing sleeve 231 and the valve housing 1 are sealed by a sealing ring 2311;

[0035] The clearance between the valve plate assembly 21 and the valve housing 1 forms an oil storage chamber. The valve housing 1 and the valve plate assembly 21 are provided with oil filling ports 532 , and the second end of the valve stem 221 is provided with an oil outlet 531 .

[0036] It should be noted that the control oil enters the oil storage cavity formed by the gap between the valve plate assembly 21 and the valve housing 1 through the oil filling port 532, and passes through the valve plate assembly 21 to the oil outlet 531. The valve plate assembly 21 includes a valve plate group formed by a plurality of pressure reducing valve plates 211 arranged in a stacked manner. Each pressure reducing valve plate 211 is evenly provided with a plurality of labyrinth oil paths 2110. By adjusting the valve stem 221 to change the number of pressure reducing valve plates 211 actually used, the amount of oil to the oil outlet 531 can be changed, and the filling flow rate can be precisely adjusted. In addition, the control oil needs to enter through the labyrinth oil path 2110 to reduce the pressure of the control oil entering the accumulator body 3, reduce the impact on the mushroom valve 6 and other components inside the accumulator, make the accumulator pressurized smoothly, and extend the operating life of the accumulator bladder.

[0037] See also Figure 2 As one embodiment of the present invention, an oil inlet hole 2111 is opened in the center of each pressure reducing valve plate 211, the first end of each labyrinth oil circuit 2110 is connected to the oil inlet hole 2111, and the second end is connected to the oil storage chamber. The labyrinth oil circuit 2110 is formed by a Z-shaped bent oil passage connected end to end, and the width of the Z-shaped bent oil passage corresponding to the first end to the second end of the labyrinth oil circuit 2110 gradually increases.

[0038] It should be noted that, according to the control oil pressure value, N maze-type oil circuits 2110 can be designed and processed on the pressure reducing valve plate 211. The maze-type oil circuit 2110 is formed by connecting the end to the end of a Z-shaped bent oil channel. Through N right-angle bent channels, the throttling resistance of the control oil is increased, the flow rate of the control oil is reduced, and the control oil pressure fluctuation is stabilized.

[0039] As one embodiment of the present invention, the valve plate assembly 21 also includes a front cover plate 212 and a rear cover plate 213. The front cover plate 212 and the rear cover plate 213 are both circular orifice plates and are respectively stacked on the two ends of the valve plate group; the pin 214 passes through the front cover plate 212, the valve plate group and the rear cover plate 213 in sequence, and its two ends are respectively fixed by shaft retaining springs.

[0040] It should be noted that the front cover plate 212 and the rear cover plate 213 are both annular hole structures, and the outer diameter and inner diameter of the front cover plate 212 and the rear cover plate 213 are the same as the outer diameter and inner diameter of the pressure reducing valve plate 211. The straight-mouthed step hole on the outer end surface of the front cover plate 212 has the same structural size as the straight-mouthed step hole on the outer end surface of the rear cover plate 213. The inner diameter size of the small hole of the straight-mouthed step hole matches the outer diameter size of the pin 214, and the matching clearance is a smaller clearance match, which is mainly used for the radial positioning of the front cover plate 212, the pressure reducing valve plate 211 and the rear cover plate 213 to ensure the concentricity of the valve plate assembly 21 and the valve stem 221; the inner diameter size of the large hole of the straight-mouthed step hole matches the outer diameter size of the shaft retaining ring, and the matching tolerance is a larger clearance match, which is mainly used for the installation and positioning of the shaft retaining ring and the pin 214 in the large hole.

[0041] As one embodiment of the present invention, it also includes a pressure relief ring 24, which is sleeved on the valve stem 221 between the valve plate assembly 21 and the sealing sleeve 231 and connected to the sealing sleeve 231. The pressure relief ring 24 forms a seal with the corresponding valve housing 1 through the sealing ring 2311.

[0042] It should be noted that the pressure reducing ring 24 has a circular hole structure. A rectangular ring is designed and processed in the middle of the outer diameter of the pressure reducing ring 24. An O-ring is installed inside the rectangular ring, which is mainly used for sealing between the pressure reducing ring 24 and the corresponding inner hole of the valve housing 1; the inner diameter of the pressure reducing ring 24 matches the outer diameter of the valve stem 221, and the matching tolerance is a clearance match. N rectangular grooves are designed and processed on the inner diameter of the pressure reducing ring 24, which are mainly used for sealing between the pressure reducing ring 24 and the valve stem 221.

[0043] As one embodiment of the present invention, the V-ring sealing structure includes an elastic element 232, a support ring 233 and a plurality of V-rings 234; the sealing sleeve 231 is a straight-mouthed step sleeve, the end face of the small hole of the step hole is provided with a V-groove, and a plurality of V-rings 234 are stacked and arranged in a large hole to form a V-ring group, and the support ring 233 elastically abuts against one end of the V-ring group through the elastic element, so that the other end of the V-ring group and the V-groove fit tightly. The elastic element includes a hole retaining spring 2321, a spring seat plate 2322 and a compression spring 2323, the spring seat plate 2322 is correspondingly arranged at one end of the support ring 233 through the hole retaining spring 2321, and the compression elastic element 232 is installed between the spring seat plate 2322 and the support ring 233.

[0044] It should be noted that the inner diameter of the V-ring 234 matches the outer diameter of the valve stem 221, and the matching tolerance is a transition fit, which is mainly used for the sealing between the V-ring 234 and the valve stem 221; the outer diameter of the V-ring 234 matches the inner diameter of the sealing sleeve 231, and the matching tolerance is an interference fit, which is mainly used for the sealing between the V-ring 234 and the sealing sleeve 231. One end of the support ring 233 is a V-shaped cone surface, which matches the V-shaped surface of the V-ring, and the matching tolerance is an interference fit, which is mainly used for the axial contact and support between the support ring 233 and the V-ring 234; the other end of the support ring 233 is a plane, and N holes are drilled in the plane. A compression spring 2323 is installed in the hole, and the compression spring 2323 generates a certain thrust on the support ring 233 to increase the sealing performance of the V-ring 234. The spring seat plate 2322 is a circular orifice plate structure; the outer diameter of the circular orifice plate matches the inner diameter of the sealing sleeve 231, and the matching tolerance is a clearance match; the inner diameter of the circular orifice plate matches the outer diameter of the valve stem 221, and the matching tolerance is a large clearance match, which is mainly used to support the thrust of the compression spring 2323 and the support ring 233 on the V-ring 234, thereby increasing the sealing ability of the V-ring 234.

[0045] As one of the embodiments of the present invention, it also includes a sealing cover 25, which is a straight-mouth stepped circular hole structure, and the outer edge of the circular hole is a protruding step portion. The sealing cover 25 is sleeved on the valve stem 221 at the end corresponding to the sealing sleeve 231 and the valve stem mounting bracket 222, and is respectively connected to the sealing sleeve 231 and the valve housing 1.

[0046] It should be noted that the inner diameter of the sealing cover 25 matches the outer diameter of the valve stem 221, and the matching tolerance is a clearance match. A straight-mouthed step hole is processed on the outer end surface of the sealing cover 25, and the sealing cover 25 is connected and fixed with fastening bolts, and the bolts are tightened with a torque wrench according to the designed torque value.

[0047] As one of the embodiments of the present invention, the valve stem mounting bracket 222 is a straight-mouthed stepped cover, and a valve stem nut 223 is inserted into its small hole. The first end of the valve stem 221 is threadedly matched with the valve stem nut 223 and extends out of the valve stem mounting bracket 222. The extended portion is provided with an indicating mechanism, and the outer cover of the indicating mechanism is provided with a protective cover 224. The extended end of the valve stem 221 is provided with a handwheel 225 through a retaining spring.

[0048] It should be noted that the valve stem nut 223 is a straight-mouth step thread sleeve structure. The outer diameter (inner end) of the valve stem nut 223 should be larger than the outer diameter (minor diameter) of the valve stem nut 223. The outer diameter (minor diameter) of the valve stem nut 223 matches the inner diameter of the valve stem mounting bracket 222. The matching tolerance is a clearance match. The outer diameter (minor diameter) of the valve stem nut 223 is designed and processed with a rectangular groove, which is mainly used for radial and circumferential positioning of the valve stem nut 223 and the valve stem mounting bracket 222. The outer diameter (minor diameter) of the valve stem nut 223 is The external thread and the locking nut are matched with each other, and the matching tolerance is a clearance match, which is mainly used for the axial (two ends) positioning of the valve stem nut 223 and the valve stem mounting bracket 222; according to the structural dimensions of the external thread of the valve stem 221, the internal thread of the valve stem nut 223 is designed and processed, and the internal thread of the valve stem nut 223 is matched with the external thread of the valve stem 221, and the matching tolerance is a clearance match, which is mainly used for the adjustment of the flow rate and stroke of the valve stem 221.

[0049] As one embodiment of the present invention, the indicating mechanism includes an indicating needle 226, a valve stem indicating plate 227 and a valve stem indicating nut 228. The valve stem indicating nut 228 is connected to the valve stem 221. The indicating needle 226 is installed on the valve stem nut 223. The valve stem indicating plate 227 is connected to the protective cover 224. The pointer end of the indicating needle 226 points to the valve stem indicating plate 227.

[0050] It should be noted that the inner diameter of the protective sleeve 224 matches the outer diameter of the valve stem indicating nut 228, and the matching tolerance is a large clearance match, which is mainly used for the axial movement of the valve stem indicating nut 228 in the protective sleeve 224; according to the structure and size of the valve stem indicating nut 228, a rectangular groove is designed and processed in the protective sleeve 224, and the valve stem indicating plate 227 is installed in the groove. By installing the indicating needle 226 on the valve stem nut 223, it is mainly used for valve position opening and operation indication. The valve position display function makes the control precision high, the failure rate extremely low, and the operation safety high.

[0051] See also Figure 3It should be noted that the valve housing 1 is a straight-mouth step hole structure, with a total of 5 step holes, and the 5 sleeves arranged in sequence in the axial direction are respectively the first sleeve 11, the second sleeve 12, the third sleeve 13, the fourth sleeve 14 and the fifth sleeve 15; the inner diameter size of the first sleeve hole matches the outer diameter size of the front cover plate 212, the matching tolerance is a small clearance match, and the hole depth is H1, which is mainly used for radial positioning of the front cover plate 212; the inner hole end face of the first sleeve 11 is designed and processed with a rectangular groove, and an O-ring is installed in the groove, which is mainly used for sealing between the front cover plate 212 and the valve housing 1; the inner hole end face of the first sleeve 11 is designed and processed with an oil outlet 531, and the diameter of the oil outlet 531 should be smaller than the diameter of the valve stem 221, which is mainly used to control the low-flow, low-pressure control oil to flow into the accumulator body 3 after the oil passes through the pressure reducing valve plate 211; The inner diameter of the hole of the second sleeve 12 is matched with the outer diameter of the valve plate assembly 21 (the front cover plate 212, the rear cover plate 213, and the valve stem assembly 22 are connected by the pin 214 to form a pressure reducing valve sleeve), and the matching tolerance is a large clearance match. The depth H2 of the second sleeve hole 12 should be smaller than the length of the valve plate assembly 21, and is mainly used for buffering before the control oil enters the valve plate assembly 21 to ensure that the control oil enters the maximum flow rate of the pressure reducing valve sleeve; the inner diameter of the hole of the third sleeve 13 is matched with the minimum outer diameter of the sealing cover 25, and the outer diameters of the pressure reducing ring 24 and the sealing sleeve 231, and the matching tolerance is a clearance match. The hole depth is H3, and the hole depth should be greater than the total width of the pressure reducing ring 24 and the sealing sleeve 231, and is mainly used for the radial positioning, sealing and axial movement of the pressure reducing ring 24 and the sealing sleeve 231.

[0052] The inner diameter size of the fourth sleeve 14 matches the maximum outer diameter size of the sealing cover 25, and the matching tolerance is a larger clearance match; the inner diameter size of the fourth sleeve 14 matches the minimum outer diameter size of the valve stem mounting bracket 222, and the matching tolerance is a smaller clearance match, which is mainly used for positioning the valve stem mounting bracket 222; the inner diameter depth of the fourth sleeve 14 should be greater than the sum of the maximum outer diameter of the sealing cover 25 and the minimum outer diameter depth of the valve stem mounting bracket 222, and the end face between the inner diameter of the third sleeve 13 and the inner diameter of the fourth sleeve 14 is designed, processed and tapped with N holes, which are mainly used to tighten the bolts to connect the sealing cover 25, and the sealing cover 25, the sealing sleeve, the pressure reducing ring 24 and the valve plate assembly 21 are axially tightened and fixed by using a torque wrench.

[0053] The inner diameter of the fifth sleeve 15 matches the maximum outer dimension of the valve stem mounting bracket 222, and the matching tolerance is a large clearance match. The inner hole depth should be greater than the width of the maximum outer diameter of the valve stem mounting bracket 222; the end face between the inner diameter of the fourth sleeve 14 and the inner diameter of the fifth sleeve 15 is designed and processed with N holes, and the holes are tapped, which are mainly used to tighten the bolts to connect and fix the valve stem mounting bracket 222.

[0054] See also Figure 4 In order to achieve the above-mentioned purpose and other related purposes, the present invention also provides a bladder accumulator, including an accumulator body 3, a valve body seat 4 and an oil inlet valve group, the oil inlet valve group includes a main oil ball valve 51 and a main valve shell 52, the main valve shell 52 is provided with a main flow channel 521, the main oil ball valve 51 is installed on the main flow channel 521, the valve body seat 4 is installed at the bottom of the accumulator body 3, and is used to connect the main flow channel 521 and the accumulator body 3, and also includes a labyrinth oil charging valve 53, the main valve shell A first bypass channel 522 and a second bypass channel 523 are also provided on 52. The first bypass channel 522 and the second bypass channel 523 are respectively connected to the main channel 521. The oil outlet 531 of the labyrinth oil filling valve 53 is connected with the first bypass channel 522 and the main channel 521. The oil filling port 532 of the labyrinth oil filling valve 53 is connected with the main channel 521 through the second bypass channel 523, and an oil filling ball valve 54 is installed on the second bypass channel 523.

[0055] Specifically, when the bladder accumulator is filled with oil, the main flow channel 521 corresponding to the oil inlet side of the main oil ball valve 51 is connected to the oil filling port 532 of the labyrinth oil filling valve 53, and the main flow channel 521 corresponding to the oil outlet side of the main oil ball valve 51 is connected to the oil outlet port 531 of the labyrinth oil filling valve 53.

[0056] See also Figure 5 As one of the embodiments of the present invention, a mounting platform 41 is provided in the flow channel of the valve body seat 4, a mushroom valve 6 is installed on the mounting platform 41, an overflow hole 411 is opened on the mounting platform 41, the overflow pipe 7 is inserted in the overflow hole 411, and a spacing is provided between its protruding end and the bottom of the valve cover of the mushroom valve 6, the bottom of the overflow hole 411 horizontally penetrates the valve body seat 4 through the drainage hole, and the drainage hole is connected to the side ball valve 412 through a short connection, and the side ball valve 412 is connected to the reflux indicator 413. Among them, the reflux indicator 413 has the function of real-time observation of whether the air in the system is removed during the oil filling process; when regularly checking the nitrogen pressure of the accumulator bladder, the flow of the control oil reflux indicator 413 is observed in real time to ensure the accuracy of the bladder nitrogen inspection.

[0057] It should be noted that a hole, namely an overflow hole 411, is drilled on the mounting sinker 41 of the valve body seat 4. The hole is a blind hole and is tapped. The internal thread matches the external thread of the overflow pipe 7, and the fitting tolerance is a clearance fit, which is mainly used for installing the overflow pipe 7; according to the drilling depth and size, a step hole, namely a drainage hole, is drilled at the corresponding position of the outer diameter of the valve body seat 4 and the bottom of the hole. The diameter of the small hole is the same as the diameter of the overflow hole 411, and the middle hole is tapped, which is mainly used for connecting the short-circuit and the adjacent ball valve 412. The depth of the large hole should be lower than the outer diameter surface of the valve body seat 4, and the diameter of the large hole matches the outer diameter of the gasket. The fitting tolerance is a clearance fit, which is mainly used for sealing between the valve body seat 4 and the connecting short-circuit.

[0058] See also Figure 6 In the bladder accumulator of the present invention, when draining oil, the oil filling ball valve 54 is closed and the main oil ball valve 51 is opened. At this time, the oil in the accumulator body 3 is discharged through the main flow channel 521. When filling oil, the main oil ball valve 51 is closed and the oil filling ball valve 54 is opened. The control oil passes through the second bypass flow channel 523 to reach the oil filling port 532 of the labyrinth oil filling valve 53, enters the oil storage cavity of the labyrinth oil filling valve 53 through the oil filling port 532, and passes through the valve plate assembly 21 to the oil outlet 531. The control oil flowing out of the oil outlet 531 passes through the first bypass flow channel 522 to the main flow channel 521, and finally passes through the mushroom valve 6 to the accumulator body 3. At the same time, when the oil filling starts, the overflow pipe 7 can empty the air in the valve body seat 4 and the labyrinth oil filling valve 53 to increase the stability of the accumulator operation.

[0059] Therefore, when the accumulator bladder is damaged and needs to be replaced, or the accumulator bladder has been inspected and nitrogen-filled, and the accumulator is put into use again, the accumulator system is pressurized through the labyrinth oil filling valve 53 without shutting down the system, so as to accurately control the oil pressure and flow rate when the system is filled with oil, thereby avoiding fluctuations in the control oil pressure and shutdown during the charging process.

[0060] 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 familiar with 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 a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0061] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0062] References throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification do not necessarily refer to the same embodiment. In addition, the particular features, structures, or characteristics of any specific embodiment of the invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described and illustrated herein may be possible in light of the teachings herein and are to be considered part of the spirit and scope of the invention.

[0063] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0064] In addition, unless otherwise explicitly indicated, any marking arrows in the drawings should be regarded as exemplary only and not limiting. In addition, unless otherwise indicated, the term "or" used herein is generally intended to mean "and / or". In the case where the term is not clear because it is anticipated that the ability to separate or combine is provided, the combination of components or steps will also be regarded as indicated.

[0065] As used in the description herein and throughout the claims that follow, "a", "an", and "the" include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of "in" includes "in" and "on" unless otherwise indicated.

[0066] The above description of the illustrated embodiments of the present invention (including the contents described in the Abstract) is not intended to be an exhaustive list or to limit the present invention to the precise form disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention as will be recognized and appreciated by those skilled in the art. As noted, these modifications may be made to the present invention in accordance with the above description of the embodiments described in the present invention, and these modifications will be within the spirit and scope of the present invention.

[0067] Systems and methods have been generally described herein as details that aid in understanding the present invention. In addition, various specific details have been given to provide an overall understanding of embodiments of the present invention. However, those skilled in the relevant art will recognize that embodiments of the present invention may be practiced without one or more of the specific details, or may be practiced using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid confusion with various aspects of embodiments of the present invention.

[0068] Thus, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the foregoing disclosure, and it should be understood that in some cases, some features of the invention will be employed without the corresponding use of other features without departing from the scope and spirit of the proposed invention. Thus, many modifications may be made to adapt a particular environment or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terms used in the claims below and / or the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Thus, the scope of the invention will be determined solely by the appended claims.

Claims

1. A labyrinth oil-filling valve, comprising a valve housing (1) and a valve body (2), wherein the valve body (2) is installed in the valve housing (1), characterized in that: The valve body (2) comprises: A valve plate assembly (21), the valve plate assembly (21) comprising a valve plate group formed by a plurality of pressure reducing valve plates (211) arranged in a stacked manner, wherein a plurality of labyrinth-type oil passages (2110) are provided on an end surface of each pressure reducing valve plate (211); A valve stem assembly (22), the valve stem assembly (22) comprising a valve stem (221) and a valve stem mounting bracket (222), a first end of the valve stem (221) being mounted on the valve stem mounting bracket (222), and a second end of the valve stem (221) being sleeved with the valve plate assembly (21); A sealing assembly (23), the sealing assembly (23) comprising a sealing sleeve (231) and a V-ring sealing structure, the V-ring sealing structure being arranged in the sealing sleeve (231), the sealing sleeve (231) being sleeved on the valve stem (221) and sealed by the V-ring sealing structure, and the sealing sleeve (231) and the valve housing (1) being sealed by a sealing ring (2311); The clearance between the valve plate assembly (21) and the valve housing (1) forms an oil storage chamber, the valve housing (1) and the valve plate assembly (21) are provided with oil filling ports (532) correspondingly, and the second end of the valve stem (221) is provided with an oil outlet (531) correspondingly.

2. The labyrinth oil filling valve according to claim 1, characterized in that: An oil inlet hole (2111) is provided at the center of each pressure reducing valve plate (211); a first end of each labyrinth oil circuit (2110) is connected to the oil inlet hole (2111), and a second end is connected to the oil storage chamber; the labyrinth oil circuit (2110) is formed by a Z-shaped bent oil passage connected end to end, and the width of the Z-shaped bent oil passage corresponding to the first end to the second end of the labyrinth oil circuit (2110) gradually increases.

3. The labyrinth oil filling valve according to claim 2, characterized in that: The valve plate assembly (21) further comprises a front cover plate (212) and a rear cover plate (213), wherein the front cover plate (212) and the rear cover plate (213) are both circular orifice plates and are respectively stacked at two ends of the valve plate assembly; the pin (214) passes through the front cover plate (212), the valve plate assembly and the rear cover plate (213) in sequence, and its two ends are respectively fixed by shaft retaining springs.

4. The labyrinth oil filling valve according to claim 3, characterized in that: It also includes a pressure reducing ring (24), which is sleeved on the valve stem (221) between the valve plate assembly (21) and the sealing sleeve (231) and connected to the sealing sleeve (231). The pressure reducing ring (24) forms a seal with the corresponding valve housing (1) through the sealing ring (2311).

5. The labyrinth oil filling valve according to claim 4, characterized in that: The V-ring sealing structure comprises an elastic element (232), a support ring (233) and a plurality of V-rings (234); the sealing sleeve (231) is a straight-mouthed step sleeve, the small hole end surface of the step hole is provided with a V-shaped groove, a plurality of V-rings (234) are stacked and arranged in the large hole to form a V-ring group, the support ring (233) elastically abuts against one end of the V-ring group through the elastic element (232), so that the other end of the V-ring group and the V-shaped groove are tightly matched.

6. The labyrinth oil filling valve according to claim 5, characterized in that: The elastic element (232) comprises a hole-use retaining spring (2321), a spring seat plate (2322) and a compression spring (2323); the spring seat plate (2322) is arranged at one end of the support ring (233) via the hole-use retaining spring (2321); and the compression elastic element (232) is installed between the spring seat plate (2322) and the support ring (233).

7. The labyrinth oil filling valve according to claim 6, characterized in that: The valve stem (221) is also provided with a sealing gland (25), wherein the sealing gland (25) is a straight-mouthed stepped circular hole structure, wherein the outer edge of the circular hole is a protruding stepped portion, and the sealing gland (25) is sleeved on the valve stem (221) at one end of the sealing sleeve (231) corresponding to the valve stem mounting bracket (222), and is respectively connected to the sealing sleeve (231) and the valve housing (1).

8. The labyrinth oil filling valve according to claim 7, characterized in that: The valve stem mounting bracket (222) is a straight-mouthed stepped gland, a valve stem nut (223) is inserted into the small hole thereof, the first end of the valve stem (221) and the valve stem nut (223) are threadedly matched and extend out of the valve stem mounting bracket (222), an indicating mechanism is provided at the extended portion, a protective cover (224) is provided on the outer cover of the indicating mechanism, and a hand wheel (225) is provided at the extended end of the valve stem (221) via a retaining spring; The indicating mechanism comprises an indicating needle (226), a valve stem indicating plate (227) and a valve stem indicating nut (228); the valve stem indicating nut (228) is connected to the valve stem (221); the indicating needle (226) is installed on the valve stem nut (223); the valve stem indicating plate (227) is connected to the protective cover (224); and the pointer end of the indicating needle (226) points to the valve stem indicating plate (227).

9. A bladder accumulator, comprising an accumulator body (3), a valve body seat (4) and an oil inlet valve group, wherein the oil inlet valve group comprises a main oil ball valve (51) and a main valve housing (52), wherein the main valve housing (52) is provided with a main flow channel (521), wherein the main oil ball valve (51) is mounted on the main flow channel (521), and the valve body seat (4) is mounted at the bottom of the accumulator body (3) for connecting the main flow channel (521) and the accumulator body (3), wherein the main flow channel (521) and the main flow channel (521) are connected to ... It also includes the labyrinth oil filling valve (53) as described in any one of claims 1 to 8, and a first bypass flow channel (522) and a second bypass flow channel (523) are also opened on the main valve housing (52), and the first bypass flow channel (522) and the second bypass flow channel (523) are respectively connected to the main flow channel (521), the oil outlet (531) of the labyrinth oil filling valve (53) and the first bypass flow channel (522) are connected, the oil filling port (532) of the labyrinth oil filling valve (53) and the second bypass flow channel (523) are connected, and an oil filling ball valve (54) is installed on the second bypass flow channel (523).

10. The bladder accumulator according to claim 9, characterized in that: A mounting platform (41) is provided in the flow channel of the valve body seat (4), a mushroom-shaped valve (6) is installed on the mounting platform (41), an overflow hole (411) is provided on the mounting platform (41), an overflow pipe (7) is inserted in the overflow hole (411), and a distance is provided between the protruding end of the overflow pipe (7) and the bottom of the valve cover of the mushroom-shaped valve (6), the bottom of the overflow hole (411) horizontally penetrates the valve body seat (4) through a drainage hole, and the drainage hole is connected to a side ball valve (412) through a short-circuit connection, and a reflux indicator (413) is connected to the side ball valve (412).

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