CN218326211U - Pulse blowback valve - Google Patents

Abstract

The utility model provides a pulse blowback valve relates to valve technical field. A valve rod protective pipe is arranged on the periphery of the valve rod above the upper valve body, a gap is reserved between the valve rod protective pipe and the valve rod, the valve rod protective pipe is fixed with the upper valve body, and at least 3 vertical heat-radiating reinforcing ribs are arranged on the periphery of the valve rod protective pipe; an upper flange and a lower flange are arranged above the valve rod protective pipe. The inventor replaces the original sealing structure of the corrugated pipe with the vertical radiating reinforcing rib, and avoids the defect that the corrugated pipe is easy to generate fatigue cracks. The temperature of the flange part is not more than 150 ℃ through the heat dissipation of the vertical heat dissipation reinforcing ribs, and the sealing material such as fluororubber in the flange part has longer service life and higher reliability. Proved through inventor's practice, adopt the utility model discloses a structure replaces the seal structure of bellows for the life of pulse blowback valve improves more than 5 times.

Description

Pulse blowback valve

Technical Field

The utility model relates to the technical field of valves, particularly, relate to a pulse blowback valve.

Background

High-temperature high-pressure pulse blowback valve is commonly used in the coal pyrolysis or coal gas dust removal technical field in the coal-to-liquids, high-temperature high-pressure pulse blowback valve is for controlling high-temperature high-pressure gas's leakage, bellows welded mode is as the mode of seal gas commonly used, but the blowback switching frequency of high-temperature high-pressure pulse blowback valve is very high, the switching is once about 5 minutes usually, the bellows just stretches out and draws back once every switching, this just leads to the bellows to easily produce fatigue crack, thereby will lose efficacy very fast, have to change frequently. And each replacement will bring about that the dust removal equipment can not work normally, thereby causing that the coal pyrolysis or the coal-to-liquid equipment can not work normally.

In view of this, the utility model discloses it is special.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pulse blowback valve, this pulse blowback valve are that the high frequency is, the highly compressed gas of quick switching high temperature is in order to obtain the pulse blowback valve of instantaneous blowback power, can be used for the coal gas dust removal technical field in the pyrolysis of coal or the coal-to-liquids.

The utility model discloses a realize like this:

the utility model provides a pulse back-flushing valve, which comprises an upper valve body, a middle valve body, a lower valve body, a valve rod and a solenoid valve, wherein a valve core is arranged in the middle valve body, a valve seat is arranged at the lower part of the middle valve body, the valve core is positioned above the valve seat, the lower valve body is positioned below the valve seat, the upper end surface of the lower valve body presses the lower end surface of the valve seat, the lower valve body is fixedly connected with the middle valve body, and the upper valve body is positioned above the middle valve body and is fixedly connected with the middle valve body;

the valve rod penetrates through the upper valve body and is connected with the valve core, and one end of the valve rod, which is far away from the valve core, is connected with a piston of the electromagnetic valve; the upper surface of the valve seat and the lower surface of the valve core are sealing surfaces; one side of the middle valve body is provided with an air inlet, and the valve seat and the lower valve body are both provided with air outlets.

A valve rod protective pipe is arranged on the periphery of the valve rod above the upper valve body, a gap is reserved between the valve rod protective pipe and the valve rod, the valve rod protective pipe is fixed with the upper valve body, and at least 3 vertical heat-radiating reinforcing ribs are arranged on the periphery of the valve rod protective pipe; an upper flange and a lower flange are arranged above the valve rod protection pipe, the upper flange and the lower flange are fixedly connected, and the valve rod penetrates through the upper flange and the lower flange.

The sealing structure of the original corrugated pipe is replaced by the valve rod protective pipe and the vertical radiating reinforcing ribs arranged on the periphery of the valve rod protective pipe, and the defect that the corrugated pipe is prone to generating fatigue cracks is overcome. Generally, the temperature of a back-blowing medium used by a high-temperature high-pressure pulse back-blowing valve with a sealing structure is 300-600 ℃, the pressure is controlled to be 0.5-2.0MPa, the temperature of a flange part is not more than 150 ℃ through the heat dissipation of a vertical heat dissipation reinforcing rib, and a sealing material such as fluororubber in the flange part has longer service life and higher reliability. Proved through inventor's practice, adopt the utility model discloses a structure replaces the seal structure of bellows for the life of pulse blowback valve improves more than 5 times.

The blowback medium temperature is, for example: 300 deg.C, 350 deg.C, 400 deg.C, 450 deg.C, 500 deg.C, 600 deg.C, etc., and any intermediate temperature value. The pressure is, for example: 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa, 1.0MPa, 1.5MPa, 2.0MPa, etc., and any pressure value in the middle. The size of pressure depends on by the size of blowback filter area, and is big more by blowback filter area, and along with the improvement of medium temperature, valve rod pillar length is corresponding extension, dispels the heat to the valve rod pillar through vertical radiating strengthening rib.

The strengthening rib has had the effect that promotes radiating efficiency on the one hand, and on the other hand has still played the fixed support's of valve rod pillar and upper valve body and lower flange effect.

The utility model discloses in the embodiment of using the preferred, every strengthening rib respectively with valve rod pillar, go up valve body, lower flange fixed connection.

In an alternative embodiment, the valve stem protective tube is welded to the upper valve body. The upper valve body is fixed with the middle valve body through fixing screws, fixing bolts, clamping pieces and the like.

The number of the reinforcing ribs can be adjusted in a self-adaptive mode according to needs, and at least 3 reinforcing ribs are arranged, so that more uniform stress and heat transfer are facilitated. For example, 3-12, etc. are provided.

The utility model discloses in the embodiment of using the preferred, the figure of strengthening rib is 8, and evenly distributed in the periphery of valve rod pillar. This not only is favorable to the evenly distributed of strengthening rib, and evenly distributed helps better heat dissipation, avoids local high temperature. For example, the reinforcing ribs are symmetrically distributed along the left and right axes of the valve rod protective pipe.

In the preferred embodiment of the utility model, the valve rod protective pipe is a seamless steel pipe, and the length of the valve rod protective pipe is 200mm-1000mm. In an alternative embodiment, the valve stem protection tube length can be adaptively lengthened as the temperature of the medium is increased. The length of valve rod pillar increases, and correspondingly the length of strengthening rib also should adaptability increase, helps increasing heat transfer area like this, can dispel the heat better, reduces the flange temperature, promotes the sealing element's at flange position life.

The temperature of the flange part is not more than 150 ℃ (for example, 150 ℃, 100 ℃, 90 ℃, 85 ℃, 80 ℃ and the like) through the heat dissipation of the vertical heat dissipation reinforcing ribs, but the corresponding temperature of the sealing part is higher than that of the flange part. In an alternative embodiment, the temperature in the region of the flange is not allowed to exceed 100 ℃.

The utility model discloses in the embodiment of using the preferred, be provided with a plurality of bracing pieces between upper flange and the solenoid valve. The upper flange and the electromagnetic valve are supported and fixed through the support rod.

In a preferred embodiment of the present invention, the number of the support rods is at least 3, such as 4.

The utility model discloses in the embodiment of using the preferred, still seted up vertical hole groove in the middle of going up the flange, vertical hole inslot is provided with the seal cover, goes up the flange top and sets up the gland, goes up the gland and fixes with last flange to compress tightly the seal cover. The arrangement of the sealing sleeve prevents blowback gas from leaking between the upper flange and the valve rod.

Optionally, the vertical hole groove is a vertical step hole groove, a sealing sleeve is arranged in a large hole groove of the vertical step hole groove, a V-shaped fluororubber sealing ring in GB/T10708.1-2000 is arranged in a small hole groove of the vertical step hole groove, three annular grooves are formed in an inner hole of the sealing sleeve, an annular groove is formed in the outer diameter of the sealing sleeve, an O-shaped fluororubber sealing ring is arranged in a lower annular groove of the inner hole of the sealing sleeve, lubricating grease is arranged in the annular groove in the inner hole of the sealing sleeve, a GB/T15242.1-1994 ladder-type coaxial sealing element is arranged in an upper annular groove of the inner hole of the sealing sleeve, the material is fluororubber, an upper gland is arranged above an upper flange, and is fixed with the upper flange through screws and tightly presses the V-shaped sealing ring; the arrangement of the structure further increases the sealing reliability between the valve rod and the sealing sleeve, is also favorable for improving the sealing effect between the sealing sleeve and the upper flange, and the fluororubber has long-term heat resistance of more than 150 ℃ and longer and more reliable service life at high temperature.

In an alternative embodiment, a wear-resistant alloy layer with HRC >38 is welded on the sealing surfaces of the valve seat and the valve core, and a pair of sealing surfaces is formed; the wear-resistant alloy with the built-up welding HRC (Rockwell hardness) of more than 38 is beneficial to preventing the deformation of the sealing parts when two sealing surfaces are contacted and impacted, preventing the brittle cracks of the sealing parts, having impact resistance obviously better than that of wear-resistant powder metallurgy, being durable, and effectively solving the problem of tight sealing of the sealing surfaces by mutual grinding of the sealing surfaces.

In an alternative embodiment, the hardfacing alloy is a cobalt-based # 6 material, although other hardfacing alloys may be selected.

The utility model discloses in the embodiment of using the preferred, be provided with bulb form end in the end of valve rod and the junction of case, be provided with the draw-in groove on keeping away from the valve rod of bulb suitable distance, set up two snap rings of running from opposite directions in draw-in groove department, the top of case is provided with the snap ring gland, snap ring gland and case fixed connection, snap ring, case, snap ring gland and valve rod radially are provided with the clearance, and snap ring and draw-in groove are provided with the clearance in the axial.

The ball head shape is arranged at the end of the valve rod, and a proper gap is left at other places, so that the valve core has a proper rotation margin, and the self-adaptive sealing of the valve core surface and the valve seat surface is facilitated.

In the preferred embodiment of the utility model, a first guide rod is arranged below the valve core; the valve seat is provided with a first guide sleeve for guiding the first guide rod. The arrangement is favorable for the valve core to be not easy to deviate from the position under the guidance of the first guide rod and the first guide sleeve, and the stability of the sealing contact between the valve core and the valve seat is improved.

The utility model discloses in the embodiment of using the preferred, the centre of going up the valve body is provided with vertical ring channel, is provided with the second uide bushing that is used for the direction valve rod in the vertical ring channel, goes up the valve body lower extreme and is provided with lower gland, lower gland and last valve body fixed connection to compress tightly the second uide bushing.

The setting of second uide bushing not only has the supporting effect to the valve rod, makes the difficult emergence of valve rod crooked, and the clearance between second uide bushing and the valve rod sets up lessly moreover, is favorable to reducing the heat of the logical steam of valve body to the space transmission more than the second uide bushing.

Furthermore, the second guide sleeve is made of a self-lubricating wear-resistant material filled with graphite; the selection of self-lubricating wear-resistant material is favorable to reducing the friction between valve rod and the second uide bushing, increase of service life.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses replace the seal structure of original bellows with the vertical radiating strengthening rib that valve rod pillar and valve rod pillar periphery set up, avoided the easy defect that produces fatigue crack of bellows. Generally, the temperature of a back-blowing medium used by a high-temperature high-pressure pulse back-blowing valve with a sealing structure is 300-600 ℃, the pressure is controlled to be 0.5-2.0MPa, the temperature of an inner cavity of a valve rod protective pipe connected with a reinforcing rib and objects at two ends of the valve rod protective pipe is greatly reduced through the heat dissipation of a vertical heat dissipation reinforcing rib, the temperature of a flange part is not more than 150 ℃, and a sealing material such as fluororubber in the flange part has longer service life and higher reliability. Proved through inventor's practice, adopt the utility model discloses a structure replaces the seal structure of bellows for the life of pulse blowback valve improves more than 5 times.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic general view of the assembly of a high-temperature high-pressure pulse blowback valve with a sealing structure;

FIG. 2 is a schematic view of the support rod and valve stem in section B-B of FIG. 1 in relation to the upper flange;

FIG. 3 isbase:Sub>A schematic structural view of the valve stem protection tube and vertical heat dissipating ribs of FIG. 1 at section A-A;

FIG. 4 is a schematic vertical cross-sectional view of the valve seat;

FIG. 5 is a schematic top view of a valve seat;

FIG. 6 is a schematic view of the valve cartridge assembly;

FIG. 7 is a schematic view of the assembly between the upper flange and the valve stem;

fig. 8 is a schematic view of the assembly of the upper valve body and the connection between the upper valve body and the lower flange.

An icon: 1-an upper valve body; 11-vertical step ring groove; 12-a second guide sleeve; 13-lower gland; 2-middle valve body; 21-air intake; 3-a lower valve body; 31-a first outlet hole; 4-a valve core; 41-lower surface of the valve core; 42-snap ring gland; 43-a first guide bar; 5-valve stem; 51-bulb-shaped end; 52-card slot; 53-snap ring; 6-two-position five-way double-coil electromagnetic valve; 7-valve seat; 71-a second air outlet; 72-the upper surface of the valve seat; 73-a first guide sleeve; 8-valve rod seamless tube protection tube; 81-vertical heat dissipation reinforcing ribs; 91-upper flange; 911-vertical hole and groove; 9111-big hole groove; 9112-small hole groove; 9113-sealing sleeve; 91131-inner hole lower annular groove; 91132-ring groove in the inner hole; 91133-an annular groove on the inner bore; 91134-seal cartridge ring groove; 91135-a first O-ring fluoroelastomer seal; 91136-a grease; 91137-a stepped coaxial seal; 91138-outer diameter ring groove; 91139-a second O-ring fluoroelastomer seal; 9114-V type fluororubber sealing ring; 912-pressing the cover; 92-a lower flange; 10-support bar.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and the terms are only used for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element to which the term refers must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Referring to fig. 1, the present embodiment provides a back-pulse valve. It includes valve body 1, well valve body 2, lower valve body 3, valve rod 5, two-position five-way double coil solenoid valve 6, valve body 2 is inside to be provided with case 4 in, the lower part of well valve body 2 is provided with disk seat 7, case 4 is located disk seat 7 top, lower valve body 3 is located disk seat 7 below, and the up end of lower valve body 3 compresses tightly the lower terminal surface of disk seat 7, and lower valve body 3 passes through the fix with screw with well valve body 2, go up the top that valve body 1 is located well valve body 2 and pass through the fix with screw with well valve body 2.

The two-position five-way double-coil solenoid valve 6 comprises a cylinder and a piston (the two are in the valve and are common structures which are not shown in the figure).

Referring to fig. 1 and 4, a valve rod 5 penetrates through the upper valve body 1 and is connected with a valve core 4, and one end of the valve rod 5, which is far away from the valve core 4, is connected with a piston of a two-position five-way double-coil electromagnetic valve 6; the upper surface 72 of the valve seat and the lower surface 41 of the valve core are sealing surfaces; one side of the middle valve body 2 is provided with an air inlet hole 21, and as shown in fig. 5, the lower valve body 3 and the valve seat 7 are respectively provided with a first air outlet hole 31 and a second air outlet hole 71.

The periphery of the valve rod 5 positioned above the upper valve body 1 is provided with a valve rod seamless pipe protective pipe 8, a gap is reserved between the valve rod seamless pipe protective pipe 8 and the valve rod 5, and the valve rod seamless pipe protective pipe 8 is fixed with the upper valve body 1.

The length of the valve rod seamless tube protection tube 8 positioned above the upper valve body is 200mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 700mm, 800mm, 900mm, 1000mm and any length in the middle. In an alternative embodiment, the valve stem protection tube is a valve stem seamless tube protection tube 8.

In the embodiment, a 500mm long valve rod seamless pipe protective pipe 8 and a valve rod 5 are selected to be provided with a single-side gap of 12mm and are welded and fixed with an upper valve body 1, at least 3 (for example, 3, 4, 5, 6 and 8) uniformly-distributed vertical radiating reinforcing ribs 81 are arranged on the periphery of the valve rod seamless pipe protective pipe 8, and 8 uniformly-distributed vertical radiating reinforcing ribs are selected in the embodiment (refer to fig. 3).

The vertical radiating reinforcing ribs arranged on the periphery of the valve rod protective pipe replace the original sealing structure of the corrugated pipe, so that the defect that the corrugated pipe is easy to generate fatigue cracks is overcome. Generally, the temperature of a back-blowing medium used by a high-temperature high-pressure pulse back-blowing valve with a sealing structure is 300-600 ℃, the pressure is controlled to be 0.5-2.0MPa, the temperature of a flange part is not more than 150 ℃ through the heat dissipation of a vertical heat dissipation reinforcing rib, and a sealing material such as fluororubber in the flange part has longer service life and higher reliability.

In this embodiment, a back-blowing medium environment of 425 ℃ and 0.8MPa pressure is selected. Used for the back blowing of the dust removal of the pyrolysis coal gas or the coal-to-liquid.

Common media for the high-temperature high-pressure pulse back-flushing valve with the sealing structure comprise nitrogen and clean coal gas. The pulse back-blowing valve provided by the embodiment meets the requirements of the use of the two gases. Preferably, the clean gas is better selected as the medium, so that the gas is purer, in addition, the nitrogen medium is saved, and the cost is correspondingly reduced.

An upper flange and a lower flange are arranged above the valve rod protective pipe and are fixed through screws. The upper end of the valve rod seamless pipe protective pipe 8 is welded and fixed with a lower flange 92, the vertical radiating reinforcing ribs 81 are respectively welded and fixed with the valve rod seamless pipe protective pipe 8, the upper valve body 1 and the lower flange 92, 4 support rods 10 are arranged between the upper flange 91 and the lower flange 92 and the two-position five-way double-coil electromagnetic valve 6 and are fixedly connected with the two-position five-way double-coil electromagnetic valve (shown in the figure 1 and the figure 2), and the valve rod 5 penetrates through the upper flange 91 and the lower flange 92.

Along with the increase of the medium temperature, the length of the valve rod protection pipe can be correspondingly lengthened, and the temperature of the flange part is not more than 150 ℃ through the heat dissipation of the vertical heat dissipation reinforcing rib; the flange portion temperature in this example was 60 ℃.

The upper surface 72 of the valve seat and the lower surface 41 of the valve core are overlaid with cobalt-based 6# or other wear-resistant alloy with HRC >38, and are mutually ground and sealed; the wear-resistant alloy with the built-up welding HRC (Rockwell hardness) of more than 38 is beneficial to preventing the sealing parts from deforming when two sealing surfaces are impacted in contact, is durable, and effectively solves the problem of tight sealing of the sealing surfaces by mutual grinding of the sealing surfaces.

Referring to fig. 6, a ball-shaped end 51 is arranged at a connection position of an end of a valve rod 5 and a valve core 4, a clamping groove 52 is arranged on the valve rod 5 far away from the ball-shaped end 51, two split clamping rings 53 are arranged at the clamping groove 52, a clamping ring gland 42 is arranged at the top end of the valve core 4, the clamping ring gland 42 is fixedly connected with the valve core 4 through screws, and gaps are arranged in radial directions of the clamping rings 53, the valve core 4, the clamping ring gland 42 and the corresponding valve rod 5; the snap ring 53 and the snap groove 52 are axially provided with a single-side gap of 1mm, the radial direction is provided with a single-side gap of 1mm, and the end of the valve rod 5 is provided with a ball head shape, so that the valve core has a proper rotation scope, and the valve core surface and the valve seat surface are more favorably sealed in a self-adaptive manner.

Referring to fig. 4, a first guide sleeve 73 is arranged in the middle of the valve seat 7, connected through a self connecting rib and fixed with the valve seat 7 through a screw, a first guide rod 43 is arranged at the center below the valve core 4, the first guide rod 43 moves up and down in the first guide sleeve 73 along with the opening and closing of the valve core 4, and a 0.05mm gap is formed between the first guide rod 43 and the first guide sleeve 73 along the radial direction; the arrangement is favorable for the valve core to be not easy to deviate from the position under the guidance of the first guide rod and the first guide sleeve, and the stability of the sealing contact between the valve core and the valve seat is improved.

Referring to fig. 8, a vertical step annular groove 11 is formed in the middle of the upper valve body 1, wherein a second guide sleeve 12 is arranged in the middle of the vertical step annular groove 11, a lower gland 13 is arranged at the lower end of the vertical step annular groove 11, the lower gland 13 is fixedly connected with the upper valve body 1 through screws and compresses the second guide sleeve 12, and the second guide sleeve 12 is made of a graphite-filled self-lubricating wear-resistant aluminum-copper material; radial unilateral clearance sets up 0.03mm between second uide bushing 12 and the valve rod 5, and the setting of second uide bushing has the existing supporting effect to the valve rod, makes the difficult emergence of valve rod crooked, simultaneously, makes the high-temperature gas through the valve body again as few as possible to the cavity transfer heat that forms between valve rod 5 and the valve rod seamless pipe pillar 8.

Referring to fig. 7, a vertical hole groove 911 is formed in the middle of the upper flange 91, the vertical hole groove 911 is a vertical step hole groove, a large hole groove 9111 of the vertical step hole groove 911 is arranged below the large hole groove 9111, a sealing sleeve 9113 is arranged in the vertical step hole groove, a small hole groove 9112 of the vertical step hole groove is arranged above the large hole groove 9111, a V-shaped fluororubber seal 9114 of GB/T10708.1-2000 is arranged in the vertical step hole groove, an inner hole of the sealing sleeve 9113 is provided with three annular grooves (a lower inner hole annular groove 91131, an inner hole intermediate annular groove 91132, an inner hole upper inner hole annular groove 91133), a sealing sleeve 91134 is arranged on the outer diameter of the sealing sleeve 9113, a first O-shaped fluororubber seal 91135 is arranged in the lower inner hole annular groove 91131 of the sealing sleeve, lubricating grease 91136 is arranged in the inner hole intermediate groove 91132 of the sealing sleeve, GB/T42.1-1994 step coaxial seal 91137 is made of fluororubber, a fluororubber is made of fluororubber, a second O-shaped fluororubber seal 91139 is arranged in the outer diameter annular groove 91138, an upper screw 912 is arranged above the upper flange 91, the upper gland 912 is fixed with the upper flange 91 through the upper gland, and compresses the V-shaped fluororubber seal 9114, and the outer diameter of the upper gland is made of the fluororubber seal 9114; the arrangement of the structure further increases the sealing reliability between the valve rod and the sealing sleeve, simultaneously enables the sealing effect between the sealing sleeve and the upper flange, and the fluororubber has the heat resistance of more than 150 ℃ for a long time and has longer and more reliable service life at high temperature.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A pulse blowback valve comprises an upper valve body, a middle valve body, a lower valve body, a valve rod and an electromagnetic valve, wherein a valve core is arranged in the middle valve body, a valve seat is arranged at the lower part of the middle valve body, the valve core is positioned above the valve seat, the lower valve body is positioned below the valve seat, the upper end surface of the lower valve body presses the lower end surface of the valve seat, the lower valve body is fixedly connected with the middle valve body, and the upper valve body is positioned above the middle valve body and is fixedly connected with the middle valve body;

the valve rod penetrates through the upper valve body and is connected with the valve core, and one end, far away from the valve core, of the valve rod is connected with a piston of the electromagnetic valve; the upper surface of the valve seat and the lower surface of the valve core are sealing surfaces; one side of the middle valve body is provided with an air inlet hole, the valve seat and the lower valve body are both provided with air outlet holes, and the valve is characterized in that,

a valve rod protective pipe is arranged on the periphery of the valve rod above the upper valve body, a gap is reserved between the valve rod protective pipe and the valve rod, the valve rod protective pipe is fixed with the upper valve body, and at least 3 vertical heat dissipation reinforcing ribs are arranged on the periphery of the valve rod protective pipe; an upper flange and a lower flange are arranged above the valve rod protection pipe, the upper portion of the valve rod protection pipe is fixedly connected with the lower flange, the upper flange is fixedly connected with the lower flange, and the valve rod penetrates through the upper flange and the lower flange.

2. The pulse blowback valve of claim 1, wherein each of the ribs is fixedly connected to the valve stem guard, the upper valve body, and the lower flange, respectively.

3. The pulse blowback valve of claim 2, wherein the number of the ribs is 4, 6 or 8 and is uniformly distributed around the periphery of the valve stem protection tube.

4. The pulse blowback valve of claim 3, wherein the valve stem guard is a seamless steel tube, and the length of the valve stem guard is 200mm-1000mm.

5. The pulse blowback valve of claim 2, wherein a plurality of support rods are disposed between the upper flange and the solenoid valve.

6. The pulse blowback valve of claim 2, wherein a vertical hole groove is further formed in the middle of the upper flange, a sealing sleeve is arranged in the vertical hole groove, an upper gland is arranged above the upper flange, and the upper gland is fixed with the upper flange and compresses the sealing sleeve.

7. The pulse blowback valve of claim 1, wherein a wear-resistant alloy layer with HRC >38 is deposited on the sealing surfaces of the valve seat and the valve core, and a pair of sealing surfaces is formed.

8. The pulse back-blowing valve according to claim 1, wherein a ball-shaped end is disposed at a connection position of the end of the valve rod and the valve core, a clamping groove is disposed on the valve rod away from the ball at a proper distance, two split clamping rings are disposed at the clamping groove, a clamping ring pressing cover is disposed at the top end of the valve core, the clamping ring pressing cover is fixedly connected with the valve core, a gap is radially disposed between the clamping ring, the valve core, the clamping ring pressing cover and the valve rod, and a gap is axially disposed between the clamping ring and the clamping groove.

9. The blowback valve of claim 8, wherein a first guide rod is disposed below the spool; the valve seat is provided with a first guide sleeve for guiding the first guide rod.

10. The pulse blowback valve of claim 9, wherein a vertical ring groove is formed in the middle of the upper valve body, a second guide sleeve for guiding the valve rod is arranged in the vertical ring groove, a lower gland is arranged at the lower end of the upper valve body, and the lower gland is fixedly connected with the upper valve body and compresses the second guide sleeve.

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