CN110953357A - Assembled constant pressure valve device with flexible sealing ring - Google Patents
Assembled constant pressure valve device with flexible sealing ring Download PDFInfo
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- CN110953357A CN110953357A CN201911347458.3A CN201911347458A CN110953357A CN 110953357 A CN110953357 A CN 110953357A CN 201911347458 A CN201911347458 A CN 201911347458A CN 110953357 A CN110953357 A CN 110953357A
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- sealing ring
- sliding
- frame body
- valve
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- 238000007789 sealing Methods 0.000 title claims abstract description 139
- 239000012530 fluid Substances 0.000 claims abstract description 64
- 230000000670 limiting effect Effects 0.000 claims abstract description 34
- 230000006835 compression Effects 0.000 claims abstract description 26
- 238000007906 compression Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 26
- 230000002829 reductive effect Effects 0.000 claims abstract description 8
- 230000005489 elastic deformation Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 230000003313 weakening effect Effects 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 10
- 230000008602 contraction Effects 0.000 abstract description 3
- 230000036961 partial effect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0473—Multiple-way safety valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Sealing Devices (AREA)
Abstract
The invention provides an assembled constant pressure valve device with a flexible sealing ring, wherein a pressure limiting part and an elastic part are sequentially arranged in a valve body, dynamic balance is formed among a cover body, the elastic part and the pressure limiting part, and the pressure limiting part comprises: the sealing device comprises a hollow cylindrical frame body, a sliding sealing element sliding in the frame body, wherein one end of the sliding sealing element is provided with a pressure inlet valve element, when the sliding sealing element slides to the surface of the pressure inlet valve element and is attached to the frame body, a pressure limiting part is sealed, and a hexaniform sealing ring is sleeved on the sliding sealing element and has a cross section shape of two adjacent cavities with opposite opening directions, the cavities are defined as compression energy charging cavities, when the fluid pressure is lower, the sealing ring is in a contraction state, so that the friction force between the sealing ring and the inner wall of the valve body in the piston movement process is reduced, when the fluid pressure is increased, the fluid pressure enables the sealing ring to expand and deform towards the radial direction of the sealing ring, the sealing effect is realized, and the problem that the service life of the device is influenced by the friction force in the working.
Description
Technical Field
The invention belongs to the technical field of constant-pressure force limiting valves, and particularly relates to an assembled constant-pressure valve device with a flexible sealing ring.
Background
The constant pressure valve is a pressure pilot valve which can be used as a main valve, wherein the normal constant pressure valve is usually called when the pressure is higher than the fixed value, and the reverse constant pressure valve is usually called when the pressure is higher than the fixed value.
Taking a common model of a positive and constant pressure valve as an example, in the model, a stainless steel diaphragm separates a valve body and a valve cover, so that in a non-working state, the stainless steel diaphragm is covered above a valve port of the valve body under the action of the elastic force of an elastic component above the stainless steel diaphragm, and the valve body is in a closed state in the non-working state. When gas is input from the bottom of the stainless steel diaphragm, the gas pressure is continuously raised until the pressure is larger than the elastic force above the diaphragm, the diaphragm is jacked up under the action of the gas pressure, and the valve port is opened.
It can be seen that the function of the constant pressure valve is realized by the repeated dynamic motion of the piston, so that the valve of the valve body is opened and closed, and the purpose of limiting the output of the fluid is achieved. The constant pressure valve or the constant pressure system in the prior art has complicated structure and more parts, so that the configuration and assembly process is complicated and the maintenance is difficult; on the other hand, the existing constant pressure valve is sealed by an O-shaped ring, and the alternating stress generated by the larger friction force causes the thermal fatigue phenomenon of the device in the frequent reciprocating motion process of the piston, so that the service life of the valve body device is influenced.
In view of the above, the prior art should be improved to solve the technical problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an assembled constant pressure valve device with a flexible sealing ring.
In order to solve the technical problems, the invention provides an assembled constant pressure valve device with a flexible sealing ring, which comprises a valve body and at least one input end and at least one output end formed on the valve body, wherein one end of the valve body is sealed by a cover body, a pressure limiting part and an elastic part are sequentially arranged in the valve body from bottom to top, one end of the elastic part abuts against the pressure limiting part and limits the pressure limiting part, the other end of the elastic part abuts against the cover body, dynamic balance is formed among the cover body, the elastic part and the pressure limiting part, and the pressure limiting part comprises: the frame body is in a hollow cylinder shape with openings at two ends, and the side wall of the frame body is provided with at least one through hole for fluid to pass through; the sliding sealing element slides in the frame body in the radial direction, one end of the sliding sealing element is provided with a pressure valve piece, and when the sliding sealing element slides to the surface of the pressure valve piece and is attached to the frame body, the side of the pressure limiting part is sealed; the sealing washer, this sealing washer is the already type sealing washer, the sealing washer cover is located on the sliding seal spare, the cross sectional shape of sealing washer is opening two adjacent cavities opposite towards, and this cavity of definition is the compression volume and fills the ability chamber, wherein, when gaseous inflow when the compression volume fills the ability chamber, has gaseous inflow the compression volume fills and can the chamber to produce the broadening deformation to its radial direction, so that another the cavity wall in compression volume fills the ability chamber receives the laminating of pressure, thereby will sliding seal spare with seal between the support body.
Preferably, the outer diameter of the sliding sealing element is matched with the inner diameter of the frame body, the pressure inlet valve member is disc-shaped, a plurality of guide ribs are formed on the wall surface of the pressure inlet valve member at intervals, the guide ribs extend to be close to the inner wall surface of the valve body, a gap is formed between every two adjacent guide ribs, the gap is defined as a pressure inlet channel, the space between the input end and the pressure limiting portion is defined as a pressure intensive chamber in the valve body, the space in the pressure limiting portion is defined as a pressure weak chamber, and after fluid is input into the valve body from the input end, the fluid passes through the pressure intensive chamber and enters the pressure weak chamber through the pressure inlet channel.
Preferably, when fluid is input into the valve body from the input end, a vortex is formed in the strong pressure chamber, the sliding sealing member is jacked up under the action of fluid pressure and moves towards the elastic part until the surface of the pressure inlet valve member at the bottom of the sliding sealing member is attached to the bottom of the frame body, in the process, part of the fluid entering the weak pressure chamber from the pressure inlet channel realizes constant-pressure output, and the rest of the fluid flows into the compression energy charging chamber to widen the sealing ring, so that the sliding sealing member and the frame body are sealed; the sliding sealing element slides and rises, the pressure in the weak pressure chamber is reduced at the moment, meanwhile, the sliding and rising of the sliding sealing element compresses the elastic part to increase the elastic deformation of the elastic part, the elasticity of the elastic part is increased to push the sliding sealing element to slide downwards until the pressure inlet valve member at the bottom of the sliding sealing element is pushed away from the surface of the frame body, and the process is continuously repeated to realize dynamic balance.
Still further preferably, a mesa-shaped flange is formed on an inner wall of the holder body, and a position of the mesa-shaped flange in a vertical direction is located above an upper edge of the through hole opening, wherein a plurality of fluid passage ports are formed on a surface of the mesa-shaped flange, and when the sliding seal member on which the seal ring is fitted is assembled with the holder body, the plurality of fluid passage ports all correspond to the compression amount charging chamber facing the fluid passage ports on the seal ring.
Still further preferably, the sliding seal spare include the cock body and be used for connecting the cock body with advance the spliced pole of pressure valve spare, wherein, the cock body top forms the mesa, this mesa with elasticity tip contact, the cock body bottom is the holding surface, works as the sliding seal spare with during the support body assembly, this holding surface with the contact of platform form flange, in the mesa with the surface depression of cock body between the holding surface forms and encircles the sealing washer mounting groove of cock body, the sealing washer set up in the sealing washer mounting groove to the cover is established on the cock body.
Still further preferably, a stress bearing groove surrounding the plug body is formed by recessing the surface of the plug body between the seal ring mounting groove and the table surface.
Further preferably, a sealing groove is formed on the side surface of the frame body near the opening at least one end of the frame body, and a sealing element is arranged in the sealing groove.
Preferably, an impact-resistant frame is arranged on the inner wall of the valve body between the frame body and the cover body, the bottom surface of the impact-resistant frame is in contact with the upper edge of the frame body, and the top surface of the impact-resistant frame is in contact with the cover body, wherein when the sliding sealing member slides to the top, the frame body is subjected to upward impact force, so that the impact-resistant frame is deformed.
Further preferably, the spring seat further comprises a fastening piece and a spring seat, wherein the spring seat is in contact with one end of the elastic part, which is not in contact with the pressure limiting part, and compresses the elastic part, and the fastening piece penetrates through the cover body and abuts against the spring seat.
Still further preferably, the cover body is a vulcanized cover body assembly, a cover body damper is arranged at a contact position of the cover body and the impact-resistant frame, the fastening piece is a circular arc head fastening screw, a receiving portion is formed by recessing the surface of one side of the spring seat, and a conical surface is correspondingly formed on the other side of the spring seat, wherein the end surface of the fastening piece abuts against the bottom of the receiving portion, and the surface of the conical surface abuts against the elastic portion and compresses the elastic portion.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
1. an O-shaped sealing ring is adopted in the existing constant pressure valve, in the repeated movement of a piston structure, the surface of the sealing ring is in contact with the inner wall of a valve body or the inner wall of a frame body to generate a large friction force, the sealing ring used in the constant pressure valve is arranged into a self-shaped sealing ring, the cross section of the sealing ring is provided with two adjacent cavities, and the opening directions of the two cavities are opposite, so that the self-shaped sealing ring is in a contraction state when the fluid pressure is low, the friction force between the sealing ring and the inner wall of the valve body or the inner wall of the frame body in the movement process of the piston is reduced, and when the fluid pressure is increased, the fluid pressure enables the self-shaped sealing ring to generate expansion deformation towards the radial direction of the self-shaped sealing ring, so that the sealing effect is realized, and;
2. the device has a simplified structure, and the assembly process can be finished by arranging all the components in the valve body in sequence, so that the effects of simplifying the assembly process, preventing assembly errors and facilitating disassembly, cleaning and replacement are achieved;
3. the sealing ring is arranged to have a bidirectional sealing one-way function, so that the requirement on the assembling direction of the sealing ring during assembling is eliminated, the assembling process is further simplified, and assembling errors are prevented;
4. the sliding sealing piece is provided with the stress bearing groove, so that the concentration of cutting residual stress is prevented, cracks caused by fatigue damage can be effectively avoided, and the rejection rate of the valve body assembly is optimized;
5. the tightening piece is in threaded connection with the cover body, so that a breathing channel is formed at the position of the valve body, namely, the pressure difference between the inside and the outside of the valve body is realized at the threaded part of the tightening piece on the side, and thus, when the pressure in the valve body is kept to be greater than the pressure outside the valve body, the dust prevention in the valve body can be realized;
6. an impact-resistant frame is arranged in the valve body, and a cover body damping structure is arranged between the impact-resistant frame and the cover body, so that the vibration impact force generated by the reciprocating motion of a sliding part in the valve body is gradually absorbed and weakened, the rigid structure of each component in the valve body is protected, the influence of the impact frequency in the pressure limiting process on the device is reduced, and the service life of the whole device is further prolonged;
7. the stress point of the frame body and the position of the supporting point are not on the vertical stress central line, and the two sides of the central position are staggered, so that the two sealing grooves are prevented from generating strain in the actual working condition, the inner diameter is enlarged, the inclination is enlarged, the material thickness of the connecting position is increased, the sealing space is prevented from being deformed, and the stability of the sealing effect is ensured.
Drawings
Fig. 1 is a schematic view illustrating a structure of an assembled constant pressure valve device with a flexible sealing ring according to an embodiment of the present invention;
fig. 2 is a sectional view showing a sectional structure of the assembled constant pressure valve device with a flexible sealing ring shown in fig. 1;
fig. 3 is a partial sectional view showing a partial sectional structure of the pressure limiter in the embodiment of the invention;
fig. 4 is a sectional view showing a sectional structure of the frame body in the pressure limiting part shown in fig. 3;
FIG. 5 is an exploded view, partially in section, of the sliding seal in the pressure limiter of FIG. 3;
FIG. 6 is a schematic view showing the structure of the plug body and connecting post in the sliding seal of FIG. 3;
FIG. 7 is a schematic view showing the structure of a seal ring in the embodiment of the present invention;
fig. 8 is a partially enlarged view showing a partially enlarged structure of a portion a of fig. 3;
FIG. 9 is a partial enlarged view of the seal ring of FIG. 8 in a deformed, partially enlarged condition with fluid flow therethrough;
FIG. 10 is a partial enlarged view of a portion of a seal ring deformed by fluid passing through the seal ring in an alternate downward orientation of the assembly of this embodiment of the present invention;
FIG. 11 is a schematic view showing the structure of the pressure inlet valve member in this embodiment of the invention;
fig. 12 is a state diagram showing a state in which the sliding seal is restrained.
Detailed Description
An embodiment of an assembled constant pressure valve device with a flexible sealing ring according to the present invention will be described with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.
It should be noted that, in the embodiments of the present invention, the expressions "first" and "second" are used to distinguish two entities with the same name but different names or different parameters, and it is understood that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and the descriptions thereof in the following embodiments are omitted.
The assembled constant pressure valve device with the flexible sealing ring comprises at least one input end and at least one output end, wherein the input end and the output end are in stroke on the valve body, namely, the constant pressure valve can be a valve body structure which is input from a plurality of input ends and performs constant pressure output from a plurality of output ends, and the embodiment of the invention is not limited by the number of the input ends or the output ends. In addition, the fluid described in the embodiment of the present invention should be understood as a variety of fluids including a gas flow and a liquid flow, and will not be described in the embodiment of the present invention.
Fig. 1 is a schematic view illustrating the structure of an assembled constant pressure valve device with a flexible sealing ring according to an embodiment of the present invention. As shown in fig. 1, the assembled constant pressure valve device with a flexible sealing ring in the embodiment of the present invention includes a valve body 10, the valve body 10 is capped by a cover body 20, in this embodiment, the cover body 20 is a vulcanized cover body assembly; the valve body 10 has a port formed at the bottom thereof as an input port 30 and a port formed at one side thereof as an output port 40. In addition, the installation hole 50 for installing the pipeline system is formed in the position of the integral mass center of the device, the installation hole 50 is formed in the position of the mass center of the device, and resonance of the device caused by excitation vibration randomly generated under the working condition of installing the pipeline system can be effectively avoided, so that the vibration resistance of the device is improved.
Fig. 2 is a sectional view showing a sectional structure of the assembled constant pressure valve device with a flexible sealing ring shown in fig. 1. Referring to fig. 2, in this embodiment, the input end 30 side is defined as the bottom of the valve body 10, and the cover 20 side is defined as the top of the valve body 10, and the pressure limiting portion 11, the elastic portion 12, the spring seat 13 and the fastening member 14 are sequentially disposed from bottom to top in the valve body 10. As shown in the figure, one end of the elastic part 12 contacts and abuts against the surface of the pressure-limiting part 11, and the other end contacts and abuts against the surface of the spring seat 13, so that, when no fluid flows through the valve body 10, the end of the elastic part 12 contacting with the spring seat 13 is fixed and limited, and the end thereof contacting with the pressure-limiting part 11 continuously pushes the pressure-limiting part 11 to the bottom of the valve body 10, i.e. the input end 30 side, under the action of the elastic tension of the elastic part 12; when the fluid is introduced into the input end 30, the pressure-limiting portion 11 slides toward the top of the valve body 10 under the action of the fluid pressure, so that the dynamic balance between the pressure-limiting portion 11 and the elastic portion 12 is formed in the valve body 10 when the fluid is introduced.
Specifically, the pressure limiter 11 is composed of a frame body 111, a sliding seal 112 slidable in the frame body 111, and a seal ring 113 fitted over the sliding seal 112. Fig. 3 is a partial sectional view showing a partial sectional structure of the pressure limiter in this embodiment of the invention. Fig. 4 is a sectional view showing a sectional structure of the frame body in the pressure limiting part shown in fig. 3. Referring to fig. 3 and 4, in this embodiment, the frame 111 is a hollow cylindrical member with two open ends, and the outer cylindrical wall thereof is provided with a plurality of through holes 114 for passing a fluid therethrough. A stepped flange 115 is formed on the inner wall of the frame body 111, and referring to fig. 4, the position of the stepped flange 115 in the vertical direction should be above the upper edge of the opening of the through hole 114, and in addition, a plurality of fluid passage ports 116 are formed on the surface of the stepped flange 115, and referring to fig. 3, when the sliding seal member 112 is assembled with the frame body 111, the sliding seal member 112 is connected with the frame body 111 with the stepped flange 115 as a limiting surface. On the side surface of the frame body 111, positions close to the openings at the two ends are respectively formed with a sealing groove 117, and the sealing groove 117 is sealed by a sealing element 118, so as to refer to fig. 4, the positions of the stress point and the supporting point of the frame body 111 are not on the vertical stress central line, and are arranged in a staggered manner at the two sides of the central position, thereby avoiding the sealing elements in the two sealing grooves from generating strain in the actual working condition to cause the inner diameter to incline; thereby increase the thick material of hookup location and prevent that deformation from influencing sealed space volume, guarantee the stability of sealed effect.
Fig. 5 is an exploded view showing a partial cross-sectional exploded structure of the sliding seal in the pressure limiter shown in fig. 3. Referring to fig. 3 and 5, the sliding sealing member 112 includes a plug body 1121 and a connecting column 1122 which are integrally formed, a pressure valve member 1123 fixedly disposed at the bottom of the connecting column 1122, and a sealing ring 113 sleeved on the plug body 1121.
Fig. 6 is a schematic view showing the structure of a plug body and a connecting column in the sliding seal shown in fig. 3. As shown in fig. 6, the top of the stopper body 1121 is formed with a circular mesa 1124, and referring to fig. 2, the bottom of the elastic member of the elastic portion 12 is contacted against the surface of the mesa 1124 when assembled. The bottom plane of the plug 1121 is a supporting surface 1125. referring to fig. 3, when the sliding seal 112 is assembled with the frame 111, the supporting surface 1125 contacts the platform-shaped flange 115, and the sliding seal 112 is connected with the frame 111 by using the platform-shaped flange 115 as a limiting surface.
A seal ring mounting groove 1126 in which the plug 1121 is annularly provided is formed in the plug 1121, and the seal ring 113 is made of a rubber material and is accommodated in the seal ring mounting groove 1126 and is fitted and fixed to the plug 1121. Fig. 7 is a schematic view showing the structure of the seal ring in this embodiment of the invention, and fig. 8 is a partially enlarged view showing a partially enlarged structure of a portion a in fig. 3. Referring to fig. 5, 7 and 8, in this embodiment of the invention, the seal ring 113 is an hex-type seal ring, and referring to the drawings, the cross-sectional shape of the seal ring 113 includes two adjacent cavities that open oppositely, which in this embodiment are defined as the compression charging cavity 1131. The seal ring 113 may have other shapes similar to the shape of the seal ring, such as a b-shape, a Z-shape, or an S-shape, and the cross-sectional shape of the seal ring 113 is not limited to a specific specification and a specific shape, as long as the cross-section of the seal ring can form two adjacent cavities with opposite opening directions as shown in fig. 5 and 7. For example, in this embodiment, the cross-sectional shape of the seal ring 113 includes two adjacent compression energy charging chambers 1131 that open toward the bottom and top of the valve body 10, respectively, and referring again to fig. 8, when the seal ring 113 is assembled, one of the two compression energy charging chambers 1131 corresponds to the fluid passage opening 116 formed in the surface of the stepped flange 115. Fig. 9 is a partially enlarged view illustrating a partially enlarged state in which the seal ring shown in fig. 8 is deformed by fluid flowing therethrough, and as shown in fig. 9, when the fluid passes through the fluid passage port 116, the fluid flows into the compression energy charging chamber 1131, and causes the compression energy charging chamber 1131 to undergo a widening deformation in a radial direction thereof, the seal ring 113 is radially widened until a surface thereof is in pressing contact with an inner wall of the frame body 111, so as to seal between the sliding seal member 112 and the frame body 111, and at this time, both side chamber walls of the compression energy charging chamber on the other side are pressed by fluid pressure and attached to each other. FIG. 10 is a partial enlarged view of a portion of a seal ring deformed by fluid passing through the seal ring in an alternate embodiment of the present invention as assembled downward. Referring to fig. 10, when the sealing ring 113 is assembled upside down, the fluid flows through the fluid channel 116 to the compression energy charging chamber 1131 ', and the compression energy charging chamber 1131' is expanded and deformed in the radial direction, the radially expanded surface of the sealing ring 113 is pressed against the inner wall of the frame body 111, and at this time, the two side chamber walls of the compression energy charging chamber on the other side are pressed and attached by the fluid pressure, so that the sealing ring 113 is set to be bidirectional sealed and unidirectional. Thereby the assembly direction requirement of sealing washer when having removed the assembly, and then further simplified the assembly process, prevented that the assembly from makeing mistakes. It is worth mentioning that a stress bearing groove surrounding the plug body 1121 can be formed on the surface of the plug body 1121 which is recessed between the sealing ring mounting groove 1126 and the platform surface 1124 so as to prevent the concentration of cutting residual stress, effectively avoid cracks caused by fatigue damage and further optimize the rejection rate of the valve body assembly
Fig. 11 is a schematic view showing the structure of the pressure inlet valve member in this embodiment of the invention. Referring to fig. 5 and 11, the pressure inlet valve member 1123 is a disk-shaped fixed member fixed to the bottom of the sliding seal 112, and a connection through hole 11231 is formed at the center of the surface thereof, and after the sliding seal 112 passes through the connection through hole 11231, the sliding seal 112 is connected and fixed to the pressure inlet valve member 1123 by the retainer ring 119. A plurality of guide ribs 11232 are formed on the pressure inlet valve member 1123 at intervals, and the guide ribs 11232 extend to be close to the inner wall surface of the valve body 10, so as shown in the figure, after the assembling and molding, a gap is formed between two adjacent guide ribs 11232, and the gap is defined as a pressure inlet channel (not shown). Referring to fig. 2, in the valve body 10 of this embodiment, a space between the input end 30 and the pressure limiter 11 is defined as a high pressure chamber 15, and a space in the pressure limiter 11 is defined as a low pressure chamber 16, so that when fluid is input into the valve body 10 from the input end 30, the fluid passes through the high pressure chamber 15 and enters the low pressure chamber 16 through a pressure inlet passage (not shown).
Referring to fig. 3, the sliding of the sliding sealing member 112 is limited by the pressure valve member 1123, that is, when the upper surface of the pressure valve member 1123 abuts against the lower opening edge of the frame 111, the pressure valve member 1123 limits the sliding sealing member 112 so that it does not rise any more, and at the same time, the pressure valve member 1123 covers the opening at the bottom of the frame 111 to form a seal. It should be noted that, in the repeated piston motion, the surface of the pressure valve 1123 will repeatedly impact the bottom surface of the frame 111, and in order to reduce the impact of the impact on the device, a rubber gasket 120 wound around the connecting column 1122 may be disposed at the connecting position of the sliding seal 112 and the pressure valve 1123, so as to buffer the impact process and maintain the stability of the device structure. Correspondingly, after the pressure inlet valve member 1123 is attached to the bottom of the frame 111, the pressure limiting portion 11 will vibrate upwards as the fluid continues to be input, and similarly, in order to weaken the impact of the impact on the device, absorb the vibration frequency caused by the impact, protect the rigid structure of the internal components of the device, and further, an impact resistant frame 17 surrounding the inner wall of the valve body 10 may be disposed between the frame 111 and the cover 20.
The sliding descending of the sliding seal member 112 is limited by the platform-shaped flange 115, that is, when the downward elastic force of the elastic portion 12 pushes the sliding seal member 112 to slide downward until the valve inlet 1123 at the bottom of the sliding seal member 112 is pushed away from the surface of the frame body 111 until the support surface 1125 of the plug body 1121 on the sliding seal member 112 contacts and abuts against the surface of the platform-shaped flange 115.
In this embodiment, the elastic portion 12 is a spring member, and referring to fig. 2, one end of the elastic portion 12 contacts and abuts against the surface of the mesa 1124 of the plug body 1121 on the sliding sealing member 112, and the other end contacts and abuts against the surface of the spring seat 13. In a normal state, both ends of the elastic portion 12 are pressed by the pressing forces from the sliding seal 112 and the spring seat 13, respectively. In this embodiment, the tightening piece 14 is a round head set screw, and the tightening piece 14 passes through the top of the cover body 20 and contacts against the surface of the spring seat 13. The spring seat 13 is recessed such that a recessed side surface of the spring seat 13 forms a receiving portion, and the other side, i.e., the surface of the protruding side, forms a vertebral body surface, such that a sharp point structure is formed between the spring seat 13 and the elastic portion 12 and the fastening member 14, i.e., the end surface of the fastening member 14 is received in the receiving portion and supports the bottom surface of the spring seat 13, and the end surface of the elastic portion 12 abuts against the bottom of the vertebral body surface.
In this embodiment, the assembly is performed in the order of the pressure-limiting portion 11, the elastic portion 12, the anti-impact frame 17, the spring seat 13, the cover 20, and the final fastening member 14. Specifically, the sealing ring 113 is sleeved in the sealing ring installation groove 1126 of the sliding sealing member 112 and then is integrally placed in the frame body 111, and then the bottom of the sliding sealing member 112 is fixed with the pressure inlet valve member 1123 through the retainer ring 119. Then, the elastic part 12 and the impact-resistant frame 17 are placed, the bottom of the elastic part 12 contacts and abuts against the mesa of the plug body 1121 of the sliding seal 112, and the other end of the elastic part is pressed by the spring seat 13 and the tightening piece 14 in a matching manner.
In operation, fluid is continuously fed from the input end 30 into the high pressure chamber 15, and since the fluid can only enter from the pressure inlet channel (not shown) between the pressure inlet valve member 1123 and the inner wall of the valve body 10, the fluid forms a vortex in the high pressure chamber 15, and the bottom surface of the pressure inlet valve member 1123 is lifted up under the pressure of the vortex and drives the sliding seal member 112 to slide toward the top of the valve body 10. Fig. 12 is a state diagram showing a state in which the sliding seal is restrained. As shown in fig. 12, when the sliding seal member 112 slides to the position where the upper surface of the pressure valve member 1123 contacts and abuts against the edge of the bottom opening of the frame 111, it is limited, and the frame 111 seals at the side. In the above process, a part of the fluid entering the low pressure chamber 16 from the pressure inlet channel (not shown) flows from the through hole 114 to the output end 40 to realize the constant pressure output of the constant pressure valve, the rest part of the fluid passes through the fluid passage port 116 of the table flange 115 and flows into the compression energy charging chamber 1131 of the sealing ring 113, the continuously flowing fluid makes the compression energy charging chamber 1131 generate the widening deformation in the radial direction thereof, the widening deformation is carried out until the surface of the sealing ring 113 is in pressing contact with the inner wall of the frame body 111, so as to seal between the sliding sealing member 112 and the frame body 111, and the two side chamber walls of the other compression energy charging chamber are pressed and attached by the fluid pressure.
After the bottom of the frame 111 is sealed, the sliding seal 112 drives the frame 111 to rise integrally, and presses the elastic portion 12 to increase its elastic deformation, so as to increase the elasticity of the elastic portion 12. Along with the increasing of the elasticity of the elastic part 12, since no fluid is introduced into the weak pressure chamber 16, the pressure of the fluid in the weak pressure chamber 16 is decreased continuously, and at a certain moment, the pressure limiting part 11 moves in the opposite direction due to the elastic force, that is, slides to the top of the valve body 10, and then slides to the bottom thereof, and after the frame 111 is limited, the elastic part 12 further pushes the sliding seal part 112 to slide to the bottom of the valve body 10 until the fluid pressure is greater than the elastic force at that moment, or the sliding seal part 112 slides to be limited by the table-shaped flange 115 of the frame 111, and the process is repeated.
In the process, a plurality of impacts are generated in the device, the surface of the pressure inlet valve member 1123 continuously impacts the edge of the bottom opening of the frame body 111 in the sliding process, the impacts are buffered by the rubber gasket 120, the impact of the upward movement of the frame body 111 is buffered by the impact resistant frame, and the contact position of the impact resistant frame 17 and the cover body 20 can be further provided with cover body damping, so that multiple buffering is realized, the vibration energy generated in the working process of the device is absorbed, the rigid structure of each component in the device is ensured, and the adverse effect of the side effect in the pressure limiting process on the service life of the device is reduced.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
1. an O-shaped sealing ring is adopted in the existing constant pressure valve, in the repeated movement of a piston structure, the surface of the sealing ring is in contact with the inner wall of a valve body or the inner wall of a frame body to generate a large friction force, the sealing ring used in the constant pressure valve is arranged into a self-shaped sealing ring, the cross section of the sealing ring is provided with two adjacent cavities, and the opening directions of the two cavities are opposite, so that the self-shaped sealing ring is in a contraction state when the fluid pressure is low, the friction force between the sealing ring and the inner wall of the valve body or the inner wall of the frame body in the movement process of the piston is reduced, and when the fluid pressure is increased, the fluid pressure enables the self-shaped sealing ring to generate expansion deformation towards the radial direction of the self-shaped sealing ring, so that the sealing effect is realized, and;
2. the device has a simplified structure, and the assembly process can be finished by arranging all the components in the valve body in sequence, so that the effects of simplifying the assembly process, preventing assembly errors and facilitating disassembly, cleaning and replacement are achieved;
3. the sealing ring is arranged to have a bidirectional sealing one-way function, so that the requirement on the assembling direction of the sealing ring during assembling is eliminated, the assembling process is further simplified, and assembling errors are prevented;
4. the sliding sealing piece is provided with the stress bearing groove, so that the concentration of cutting residual stress is prevented, cracks caused by fatigue damage can be effectively avoided, and the rejection rate of the valve body assembly is optimized;
5. the tightening piece is in threaded connection with the cover body, so that a breathing channel is formed at the position of the valve body, namely, the pressure difference between the inside and the outside of the valve body is realized at the threaded part of the tightening piece on the side, and thus, when the pressure in the valve body is kept to be greater than the pressure outside the valve body, the dust prevention in the valve body can be realized;
6. an impact-resistant frame is arranged in the valve body, and a cover body damping structure is arranged between the impact-resistant frame and the cover body, so that the vibration impact force generated by the reciprocating motion of a sliding part in the valve body is gradually absorbed and weakened, the rigid structure of each component in the valve body is protected, the influence of the impact frequency in the pressure limiting process on the device is reduced, and the service life of the whole device is further prolonged;
7. the stress point of the frame body and the position of the supporting point are not on the vertical stress central line, and the two sides of the central position are staggered, so that the two sealing grooves are prevented from generating strain in the actual working condition, the inner diameter is enlarged, the inclination is enlarged, the material thickness of the connecting position is increased, the sealing space is prevented from being deformed, and the stability of the sealing effect is ensured.
The present invention has been described in detail, and the embodiments are only used for understanding the method and the core idea of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and to implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides a take assembled constant pressure valve device of flexible sealing washer, the device include the valve body with at least one input and at least one output that form on the valve body, the lid is sealed through on the top of valve body, sets gradually pressure limiting part and elasticity portion from the bottom up in the valve body, the one end of elasticity portion with pressure limiting part offsets and is spacing pressure limiting part, its other end with the lid offsets, form dynamic balance between lid, elasticity portion and the pressure limiting part, its characterized in that, pressure limiting part includes:
the frame body is in a hollow cylinder shape with openings at two ends, and the side wall of the frame body is provided with at least one through hole for fluid to pass through;
the sliding sealing element slides in the frame body in the radial direction, one end of the sliding sealing element is provided with a pressure valve piece, and when the sliding sealing element slides to the surface of the pressure valve piece and is attached to the frame body, the side of the pressure limiting part is sealed;
a seal ring which is a Heji seal ring, the seal ring is sleeved on the sliding seal piece, the cross section of the seal ring is in the shape of two adjacent cavities with opposite opening directions, the cavity is defined as a compression energy charging cavity, wherein,
when gas flows to the compression capacity energy charging cavity, the compression capacity energy charging cavity with gas flowing in generates widening deformation towards the radial direction of the compression capacity energy charging cavity, so that the cavity wall of the other compression capacity energy charging cavity is attached under pressure, and the sliding sealing element and the frame body are sealed.
2. The assembled constant pressure valve device with flexible sealing ring according to claim 1, wherein the outer diameter of the sliding sealing member is matched with the inner diameter of the frame body, the pressure valve member is disc-shaped, and a plurality of guiding ribs are formed on the wall surface of the pressure valve member at intervals, wherein,
the guide ribs extend to be close to the inner wall face of the valve body, a gap is formed between every two adjacent guide ribs and is defined as a pressure inlet channel, the space between the input end and the pressure limiting portion in the valve body is defined as a pressure intensifying chamber, the space in the pressure limiting portion is defined as a pressure weakening chamber, and after fluid is input into the valve body from the input end, the fluid passes through the pressure intensifying chamber and enters the pressure weakening chamber through the pressure inlet channel.
3. The assembled constant pressure valve assembly with a flexible sealing ring according to claim 2, wherein the dynamic balance is:
when fluid is input into the valve body from the input end, a vortex is formed in the strong pressure chamber, the sliding sealing piece is jacked up under the action of fluid pressure and moves towards the elastic part until the surface of the pressure inlet valve piece at the bottom of the sliding sealing piece is attached to the bottom of the frame body, in the process, part of the fluid entering the weak pressure chamber from the pressure inlet channel is output at constant pressure, and the rest of the fluid flows into the compression capacity charging cavity to widen the sealing ring, so that the sliding sealing piece and the frame body are sealed;
the sliding sealing element slides and rises, the pressure in the weak pressure chamber is reduced at the moment, meanwhile, the sliding and rising of the sliding sealing element compresses the elastic part to increase the elastic deformation of the elastic part, the elasticity of the elastic part is increased to push the sliding sealing element to slide downwards until the pressure inlet valve member at the bottom of the sliding sealing element is pushed away from the surface of the frame body, and the process is continuously repeated to realize dynamic balance.
4. The assembled constant pressure valve device with the flexible sealing ring according to claim 2, wherein a mesa-shaped flange is formed on the inner wall of the frame body, and the mesa-shaped flange is positioned above the upper edge of the through hole opening in the vertical direction, wherein,
the surface of the table-shaped flange is provided with a plurality of fluid passage ports, and when the sliding sealing element sleeved with the sealing ring is assembled with the frame body, the plurality of fluid passage ports correspond to the compression quantity charging cavities on the sealing ring facing the fluid passage ports.
5. The assembled constant pressure valve device with flexible sealing ring according to claim 4, wherein the sliding sealing member comprises a plug body and a connecting column for connecting the plug body and the pressure inlet valve member, wherein,
the cock body top forms the mesa, this mesa with elasticity tip contact, the cock body bottom is the holding surface, works as the sliding seal spare with during the support body assembly, this holding surface with the contact of platform form flange, in the mesa with the cock body surface between the holding surface is sunken to form and is encircleed the sealing washer mounting groove of cock body, the sealing washer set up in the sealing washer mounting groove to the cover is established on the cock body.
6. The assembled constant pressure valve device with the flexible sealing ring according to claim 5, wherein the surface of the plug body between the sealing ring mounting groove and the table surface is recessed to form a stress bearing groove surrounding the plug body.
7. The assembled constant pressure valve device with the flexible sealing ring according to any one of claims 4 to 6, wherein a sealing groove is formed on the side surface of the frame body near the opening at least one end of the frame body, and a sealing member is arranged in the sealing groove.
8. The assembled constant pressure valve device with the flexible sealing ring according to claim 1, wherein an impact-resistant frame is disposed on the inner wall of the valve body between the frame body and the cover body, the bottom surface of the impact-resistant frame is in contact with the upper edge of the frame body, and the top surface of the impact-resistant frame is in contact with the cover body,
when the sliding sealing element slides towards the top, the frame body is subjected to upward impact force, and therefore the impact-resistant frame is deformed.
9. The assembled constant pressure valve device with a flexible sealing ring according to any one of claims 1 to 6 and 8, further comprising a tightening piece and a spring seat, wherein,
the spring seat is in contact with one end, which is not in contact with the pressure limiting part, of the elastic part and compresses the elastic part, and the fastening piece penetrates through the cover body and abuts against the spring seat.
10. The assembled constant pressure valve device with a flexible sealing ring according to claim 9, wherein the cover is a vulcanized cover assembly, a cover damper is provided at a contact position of the cover and the anti-impact frame, the fastening member is a circular arc head fastening screw, a surface of one side of the spring seat is recessed to form a receiving portion, and a tapered surface is correspondingly formed at the other side of the spring seat, wherein,
the end face of the fastening piece abuts against the bottom of the accommodating part, and the surface of the vertebral body surface abuts against the elastic part and compresses the elastic part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911347458.3A CN110953357B (en) | 2019-12-24 | 2019-12-24 | Assembled constant pressure valve device with flexible sealing ring |
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| CN201911347458.3A CN110953357B (en) | 2019-12-24 | 2019-12-24 | Assembled constant pressure valve device with flexible sealing ring |
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Cited By (1)
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| CN113974775A (en) * | 2021-11-17 | 2022-01-28 | 上海腾复医疗科技有限公司 | Sheath sealing device and thrombus suction system comprising same |
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| CN110953357B (en) | 2024-06-21 |
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