A biomass flow control valve with bellows seal

Abstract

The present invention belongs to the field of valve technology, and specifically relates to a biomass flow control valve with a bellows seal. The valve cavity of the present invention is provided with an inlet passage on one side thereof, and a valve seat is arranged in the inlet passage; the inner end of the valve seat is pressed against the side wall of the valve core by an elastic member, and forms a sealing surface-type sliding fit relationship with the side wall of the valve core; the valve core is in the shape of a barrel with a barrel mouth, and a flow window is provided on the side wall of the valve core; a guide block for connecting the flow window and the medium outlet in a smooth transition shape is arranged at the barrel mouth of the valve core; a telescopic tube is sleeved on a section of the valve stem between the outer barrel bottom of the valve core and the top wall of the valve cavity, so that the area between the telescopic tube and the valve stem constitutes a central purge cavity, and the area between the telescopic tube and the side wall of the valve cavity constitutes an outer purge cavity. The present invention can achieve the smooth passage of biomass particles or powders, and effectively reduce or even avoid the problem of material blockage caused by the poor fluidity and easy agglomeration characteristics of biomass particles or powders.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a biomass flow control valve with a bellows seal. Background Art

[0002] Biomass is an important renewable energy source; biomass gasification technology can achieve higher utilization rates at a smaller scale and provide a high-grade energy form, making it an important technology for the clean and efficient use of biomass. Currently, the more feasible biomass gasification technology can be referred to the text of patent publication number "CN106705028A". The main process route is: first, biomass is prepared into particles or powder, which is transported to a biomass incinerator or biomass gasifier through a pneumatic conveying pipeline. At the same time, oxygen or oxygen-containing substances are used as gasifying agents to convert the combustible part of the biomass fuel into combustible gases (mainly hydrogen, carbon monoxide and methane) under high temperature conditions. The main technical difficulty in this process is that in order to meet the continuous controllability of the gasification process, it is necessary to stably control the delivery flow of solid phase media such as biomass particles or powders. However, the control valves in the prior art often cannot achieve this goal. The biggest reason is that the poor flowability and easy agglomeration of biomass particles or powders make the control valves in the prior art very prone to blockage during use. Furthermore, the angled design of existing control valves, coupled with the inherent placement of the valve seat on the outlet side of the valve cavity, further exacerbates the aforementioned blockage problem. This particular positioning of the valve seat makes it difficult to achieve a fluidized design between the outlet valve seat and the valve core, exacerbating the blockage problem. Clearly, most current biomass gasification systems require continuous feedstock. If this blockage occurs, it can cause significant fluctuations in the operating conditions of the biomass incinerator or biomass gasifier, or even shut down the furnace, resulting in irreparable production losses. Therefore, a solution is urgently needed. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a biomass particle or powder flow control valve with a bellows seal that has a compact and reasonable structure and flexible and convenient regulation. The valve can achieve smooth passage of biomass particles or powders and effectively reduce or even avoid the blockage problem caused by the poor fluidity and easy agglomeration characteristics of biomass particles or powders.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A biomass flow control valve with a bellows seal, characterized by comprising a valve body having a valve cavity, wherein a valve core is connected to a linear power source via a valve stem, thereby enabling the valve core to perform reciprocating linear motion along the axial direction of the valve cavity, with the bottom of the valve cavity constituting a medium outlet; an inlet passage is provided through one side of the valve cavity, with a valve seat disposed within the inlet passage; and an elastic member capable of applying an inward force along the axial direction of the valve seat, wherein the inner end of the valve seat is pressed against a side wall of the valve core by means of the elastic member, and forms a sealing surface-type sliding fit relationship with the side wall of the valve core.

[0006] The valve core is in the shape of a barrel with a barrel mouth, and a flow window is opened on the side wall of the valve core. The outer shape of the cylindrical cavity at the inner end of the valve seat is consistent with the shape of the flow window; a guide block for smoothly transitioning the flow window and the medium outlet is arranged at the barrel mouth of the valve core; a telescopic tube is sleeved on a section of the valve stem between the outer barrel bottom of the valve core and the top wall of the valve cavity, so that the area between the telescopic tube and the valve stem constitutes a central purge cavity, and the area between the telescopic tube and the side wall of the valve cavity constitutes an outer purge cavity. The secondary air source enters the purge flow channel arranged in the valve stem through the central purge cavity, and is then blown out through the preset air hole on the guide block. The axis of the air hole is parallel to the axis of the valve core or is arranged obliquely along the slope direction of the guide surface of the guide block; the main air source enters the air flow channel between the valve core and the valve cavity through the outer purge cavity and is then ejected.

[0007] Preferably, the guide sleeve is coaxially arranged in the valve cavity through the valve cover compression type, and the inner wall of the guide sleeve is radially protruded with guide ribs. The inner annular surface formed by the guide ribs constitutes a sliding surface for the valve seat to slide axially, and the gap between adjacent guide ribs constitutes the air flow channel; the flow window is opened between two adjacent guide ribs, and the guide sleeve is provided with an avoidance opening for the inner end of the valve seat to pass through.

[0008] Preferably, a secondary purge port is provided at the end of the valve cover for admitting a secondary gas source; the secondary gas source enters the sliding gap between the valve stem and the valve cover through the secondary purge port, and then enters the purge flow channel through the air inlet on the valve stem.

[0009] Preferably, the cylindrical cavity of the valve cover has a two-stage stepped hole shape with a small diameter at one end close to the valve core and a large diameter at the other end. The small-diameter section of the valve cover is coaxially sleeved with a positioning sleeve, so that a transition cavity is formed between the positioning sleeve and the large-diameter section of the valve cover; a main purge port for the main gas source to pass through is opened on the side wall of the valve cover, and the gas of the main gas source enters the transition cavity through the main purge port, and then enters the outer purge cavity through the gap between the positioning sleeve and the end of the valve cover, and finally enters the air flow channel.

[0010] Preferably, either the length direction of the guide ribs is parallel to the axial direction of the valve core, and each guide rib is evenly distributed on the inner wall of the guide sleeve around the axis of the guide sleeve; or the length direction of the guide ribs intersects with the axial direction of the valve core, and each guide rib is evenly distributed on the inner wall of the guide sleeve around the axis of the guide sleeve to form a multi-helical structure.

[0011] Preferably, the end of the guide sleeve close to the medium outlet is pressed against the top of the outlet bushing, and the bottom end of the outlet bushing is pressed and fixed by the outlet nipple or outlet flange, and the outlet nipple or outlet flange is bolted to the valve body; the cylindrical cavity of the outlet bushing close to the medium outlet is in the shape of a tapered hole with a gradually decreasing aperture.

[0012] Preferably, along the flow direction of the solid medium, a transition bushing, a lofting bushing and a valve seat are arranged in sequence in the inlet cavity; the transition bushing is pressed and fixed by an inlet nipple or an inlet flange, and the inlet nipple or the inlet flange is bolted to the valve body; a sealing ring constituting an elastic part is coaxially clamped between the inlet nipple or the inlet flange and the transition bushing.

[0013] Preferably, the inner cavity of the lofted bushing has a smooth transition structure from a circular inlet to a rectangular outlet.

[0014] Preferably, the axis of the inlet passage and the axis of the valve core intersect with each other, and the tip of the angle formed points in the direction of the medium outlet.

[0015] Preferably, the telescopic tube is a bellows.

[0016] The beneficial effects of the present invention are:

[0017] 1) Through the above-mentioned solution, the present invention, on the one hand, takes a novel approach by placing the valve seat on the medium inlet side and forming a seal with the side of the valve core along the solid-phase medium flow direction. Under the action of the elastic member and the medium force, the sealing surface of the valve seat and the valve core forms a sealing pressure ratio. Furthermore, when the valve of the present invention is in the closed state, it effectively confines granular or powdered solid-phase medium to the valve inlet side, eliminating the need for the valve cavity where the valve stem of the valve core is located to withstand high pressure, and the valve stem packing seal also does not need to withstand high pressure, effectively ensuring the service life of the valve stem packing seal. When the valve is in the open state, the flow window on the valve core gradually emerges in the valve seat flow channel, allowing the solid-phase medium to flow from the valve seat flow channel through the flow window on the valve core to the downstream side. Combined with the valve's angled structure, this ensures a clean valve cavity with no dead corners, preventing solid-phase medium from accumulating. Furthermore, the downward movement of the valve core, combined with the medium outlet at the bottom of the valve body, creates a closed-flow structure for the entire valve that protects the sealing surface. This also effectively reduces erosion and abrasion of the valve trim, extending the service life of the valve. At the same time, since the flow direction of the solid-containing medium when flowing out of the valve core is parallel to the axis of the valve cavity outlet flow channel and is located in the center of the flow channel, the erosion of the downstream valve cavity wall by the solid-containing medium after throttling is avoided, with significant results.

[0018] On the other hand, when actually designing the present invention, it is preferred that the valve core is a sleeve-type structure. At this time, the solid-phase medium flows from the valve seat through the flow window on the valve core to the internal cavity of the valve core, and the flow window opened on the valve core can be set to different forms such as circular, rectangular, triangular, and teardrop-shaped, thereby achieving different flow regulation characteristics. Compared with the control valve in the prior art, under the same throttling area conditions, the valve opening of the present invention is larger, the passability of the solid-phase medium is better, and it is more conducive to avoiding the obstruction and blockage of the solid-phase medium. On this basis, the present invention also adds a guide block inside the valve core, which is conducive to guiding the fluid to flow into the internal cavity of the valve core, and then it can flow smoothly to the downstream through the guide surface on the guide block, avoiding the turbulent flow of the solid-phase medium after throttling, and slowing down its erosion of the valve internals and even the valve cavity. In particular, with the air holes on the guide block, external gas is flowed into the purge flow channel of the valve stem through the air inlet purge chamber and finally blown out through the purge port. At this time, the airflow and the solid phase medium travel in the same direction, which helps the solid phase medium to form a more passable gas-containing state with a higher initial velocity, and ultimately effectively reduces or even avoids the blockage problem caused by the poor fluidity and easy agglomeration characteristics of biomass particles or powders.

[0019] Finally, the dual-air source design of this invention allows areas around the valve core, such as those requiring greater wind force to enclose and envelop the solid-phase medium, to be supplied with a greater airflow via the primary air source. Meanwhile, the air holes in the guide block only require less wind force to achieve the desired effect of enveloping and pushing the solid-phase medium on the guide surface, thus sufficing for the intended purpose with a single, low-volume secondary air source. The air volume ratio between the primary and secondary air sources can even be adaptively adjusted based on the flow of the solid-phase medium on site, ensuring smooth passage of the solid-phase medium while preventing it from backwashing toward the valve cover area, thereby maximizing the energy efficiency and service life of the equipment.

[0020] 2) During the design, considering the need to balance the gas flow state of the main gas source and the efficient sliding effect of the valve core, it is preferred to set a guide sleeve with guide ribs on the outside of the valve core, which is beneficial to the stable guidance of the valve core during the reciprocating movement; the valve core is subject to a certain lateral force under the condition of valve seat sealing, and the guide sleeve with guide ribs can provide support. The contact area between the guide ribs and the valve core is small, so that the friction resistance during the movement of the valve core is also small, which is beneficial to the effective movement of the valve core. The arrangement of the guide ribs not only has the above-mentioned functions of facilitating guidance and providing support, but also has the effect of forming an airflow channel, thereby achieving the purpose of unobstructed air flow from the main gas source, the periphery of the valve core to the medium outlet.

[0021] 3) The secondary purge port connected to the auxiliary air source is arranged at the end of the valve cover, which allows the purge gas to flow from the packing seal at the end of the valve cover into the gap between the valve stem and the telescopic tube, and then flow into the interior of the valve core through the purge flow channel provided on the valve stem, and then purge to the downstream through the air holes provided on the guide block; since the purge direction of the purge gas is consistent with the flow direction of the solid phase medium, this is conducive to blowing the biomass particles or powder to the downstream, and is less likely to cause risks such as blockage.

[0022] 4) Since clean purge gas always passes through the valve stem and the bellows serving as the expansion tube, even when the bellows is damaged, it can ensure that the solid-containing medium will not enter the above-mentioned packing seal of the valve stem, effectively ensuring the service life of the seal.

[0023] 5) The main purge port is designed to deliver purge gas in layers and stages with the secondary gas source. The gas from the main purge port can enter the outer purge chamber through the transition chamber, achieving the purpose of enveloping and draining the periphery of the solid phase medium's passage path.

[0024] 6) Guide ribs can be parallel or designed to be distributed in a spiral pattern along the reciprocating motion of the valve core. Spiral guide ribs are more effective in providing a counterforce to the valve core when it is subjected to sealing forces, and they also provide better guidance and wrapping of the valve core without increasing the contact area. Spiral guide ribs are particularly beneficial in creating a swirl of purge gas, thereby better agitating the solid phase in the valve cavity and allowing it to be discharged smoothly downstream, minimizing the risk of siltation and blockage. Of course, the purge gas can also be replaced with a flushing fluid to achieve a cleaning function.

[0025] 7) The guide sleeve has an outlet bushing at its lower end and a positioning sleeve at its upper end. The outlet bushing's specific tapered hole shape further ensures efficient discharge of the solid phase medium.

[0026] 8) Regarding the inlet cavity, on the one hand, the axis of the inlet cavity intersects with the axis of the valve core. This creates an angle between the valve inlet cavity and the medium outlet along the solid-phase flow direction, which reduces the throttling angle of the medium flow, facilitates a smoother flow of the solid-phase medium downstream, and further ensures the effectiveness of the present invention. Furthermore, the sequential arrangement of a transition bushing, a lofted bushing, and a valve seat within the inlet cavity, along with the use of an elastic member, ensures functionality and facilitates easy assembly.

[0027] For example, if the flow window on the valve core is rectangular, the inner cavity of the lofted bushing can be designed with a smooth transition from a circular inlet to a rectangular outlet. This change in flow path cross-section is incorporated into the lofted bushing, simplifying the manufacturing process for components such as the valve body. Furthermore, the lofted bushing is easier to replace and maintain later, offering a further advantage.

[0028] 9) As for the telescopic tube, the present invention preferably uses a bellows. In practice, it can also be made of other axially retractable tubes, such as axially retractable elastic tubes, or multi-section sleeves with springs as reset power, etc. The selection can be made according to the actual situation on site and will not be repeated here.

[0029] 10) The inlet duct and the medium outlet of the present invention can be provided with different types of flanges or short sections according to different process requirements, so as to adapt to different on-site application conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 and Figure 4 are structural cross-sectional views of two embodiments of the present invention;

[0031] Figure 2 for Figure 1 A partial enlarged view of part I;

[0032] Figure 3 for Figure 1 A partial enlarged view of part II.

[0033] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0034] a-outer purge chamber; b-center purge chamber; c-transition chamber;

[0035] 10-valve body; 20-valve core; 21-flow window; 30-valve stem; 31-purge flow channel; 32-air inlet;

[0036] 40- linear power source; 50- valve seat; 51- elastic member; 60- guide block; 61- air hole;

[0037] 70-guide sleeve; 71-guide rib; 72-avoidance; 81-outlet bushing; 82-outlet nipple;

[0038] 91-transition bushing; 92-lofting bushing; 93-inlet nipple; 100-telescopic tube;

[0039] 110-valve cover; 111-main purge port; 112-secondary purge port; 113-positioning sleeve. DETAILED DESCRIPTION

[0040] For ease of understanding, here we combine Figure 1-Figure 4 The specific structure and working mode of the present invention are divided into the following two groups of embodiments, which are further described below:

[0041] Example 1:

[0042] In this embodiment, the actual structure of the present invention is referred to Figure 1As shown, the whole adopts an angle structure, with upper inlet and side outlet, that is, the valve cavity is arranged in the valve body 10 and formed as shown in FIG. Figure 1 The side outlet of the medium is connected to the upper part of the valve cavity through the inlet channel; in conjunction with the linear hydraulic actuator constituting the linear power source 40, the reciprocating flow-closing action of the valve core 20 can be achieved, wherein:

[0043] like Figure 1 As shown, the valve seat 50 is located at the side inlet passage, and is positioned sequentially from the inside out by the lofting bushing 92 and the transition bushing 91, and cooperates with the elastic structure such as the sealing ring or compression spring as the elastic member 51 to realize floating elastic compensation, and finally is tightened by the inlet short section 93 to ensure that the valve seat 50 and the outer wall of the cylindrical valve core 20 are sealed against each other. At the same time, since the valve core 20 itself is sleeve-shaped, a guide block 60 can be added inside, and the guide surface of the guide block 60 transitions the inlet flow direction and the outlet flow direction of the valve in an arc. Even a circular limiting sleeve can be added between the guide block 60 and the bottom of the barrel inside the valve core 30 to limit the position of the guide block 60, refer to Figure 3 As shown; of course, the guide block 60 can also be directly integrated with the limiting sleeve.

[0044] In addition, if Figure 2 As shown, a guide sleeve 70 is also provided on the outside of the valve core 20. The guide sleeve 70 is provided with several guide ribs 71 evenly distributed around the axis of the valve core 20, so that the inner sides of the guide ribs 71 cooperate with the valve core 20 for guidance. The arrangement of the guide ribs 71 is also particular. They may be arranged as multiple parallel ribs 71 extending axially, or as a single or multiple spiral structures intersecting the axis of the valve core 20. Taking multiple parallel ribs 71 extending axially as an example, preferably, when there are three guide ribs 71 evenly distributed around the axis of the guide sleeve 70, the side opening 72 on the guide sleeve 70, through which the inner end of the valve seat 50 passes, should be located between two guide ribs 71. The third guide rib 71 is located on the other side of the valve core 20 relative to the flow window 21 and is located in the same direction as the sealing pressure of the valve seat 50. When the valve core 20 is subjected to the sealing force from the valve seat 50, the third guide rib 71 primarily provides the counterforce.

[0045] In actual design, Figure 1 In the structure shown, the valve cavity actually includes the cavity of the valve body 10 and the cavity of the valve cover 110, that is, the two cavities together form the valve cavity; Figure 2 In the figure, it can be seen that the joint between the valve cover 110 and the valve stem 30 adopts a packing seal to ensure the normal reciprocating action of the valve stem 30. On this basis, considering the ventilation effect of the secondary gas source, refer to Figure 2As shown, the gas blown out from the secondary air source enters through the secondary purge port 112 on the valve cover 110, and enters the central purge chamber b through the reserved gap at the packing seal, or the sliding gap, and then enters the purge channel 31 through the air inlet 32 ​​on the valve stem 30, and finally is ejected to the downstream through the air hole 61 provided on the guide surface of the guide block 60. Figure 2 In the figure, the passage path of the gas from the main gas source can also be seen. The main purge port 111 is located beside the valve cover 110 and passes through the valve cover 110. In this way, when the main gas source is ventilated, the gas from the main gas source enters the transition chamber c between the positioning sleeve 113 and the valve chamber wall at the valve cover through the main purge port 111, and then enters the outer purge chamber a between the telescopic tube 100 and the positioning sleeve 113 through the gap between the positioning sleeve 113 and the end of the valve cover 110, and finally enters the air flow channel between the adjacent guide ribs 71, and then is sprayed into the downstream to complete the gas flow path, which is more conducive to blowing the solid phase medium to the downstream and is less likely to cause risks such as blockage.

[0046] In actual arrangement, the axis of the air hole 61 can be directly parallel to the axis of the valve core 20, or it can be slightly inclined to one side along the slope direction of the guide surface of the guide block 60, all to ensure that the purge direction of the purge gas is consistent or roughly consistent with the flow direction of the solid phase medium.

[0047] Furthermore, an outlet bushing 81 can be installed at the medium outlet, cooperating with an outlet nipple 82 to secure the outlet bushing 81. The outlet bushing 81 can be straight, flared, or contracted, depending on the design to fit within the lower portion of the valve cavity. Furthermore, the barrel of the outlet bushing 81 near the medium outlet is tapered with a gradually decreasing diameter, facilitating more efficient and accelerated flow of solid-phase media.

[0048] Example 2:

[0049] The actual structure of this embodiment is basically the same as that of embodiment 1, and the only difference is that the axis of the inlet channel and the axis of the valve core 20 intersect with each other. At this time, the inlet channel and the medium outlet form a specific angle of 60° along the flow direction of the solid phase medium, which can make the throttling reversing angle of the medium flow smaller, which is conducive to a smoother flow of the solid phase medium to the downstream, further ensuring the working effect of the present invention. For specific reference Figure 4 shown.

[0050] Of course, it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but also encompasses the same or similar embodiments that can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description.

[0051] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0052] The technical parts not described in detail in the present invention are all well-known technologies.

Claims

1. A biomass flow control valve with bellows seal, characterized by: The invention comprises a valve body (10) having a valve cavity, characterized in that: a valve core (20) is connected to a linear power source (40) via a valve stem (30), so that the valve core (20) can perform reciprocating linear motion along the axial direction of the valve cavity, and the bottom of the valve cavity constitutes a medium outlet; an inlet passage is provided through one side of the valve cavity, and a valve seat (50) is arranged in the inlet passage; and an elastic member (51) can be provided to apply force inward along the axial direction of the valve seat (50), and the inner end of the valve seat (50) is pressed against the side wall of the valve core (20) by the elastic member (51), and a sealing surface-type sliding fit relationship is formed between the valve seat (50) and the side wall. The valve core (20) is in the shape of a barrel with a barrel mouth, and a flow window (21) is provided on the side wall of the valve core (20). The outer shape of the cylindrical cavity at the inner end of the valve seat (50) matches the outer shape of the flow window (21). A guide block (60) for connecting the flow window (21) and the medium outlet in a smooth transition shape is arranged at the barrel mouth of the valve core (20). A telescopic tube (100) is sleeved on a section of the valve stem between the outer barrel bottom of the valve core (20) and the top wall of the valve cavity, so that the area between the telescopic tube (100) and the valve stem (30) forms a central blow hole. The area between the telescopic tube (100) and the side wall of the valve cavity forms an outer purge cavity (a), the secondary air source enters the purge flow channel (31) arranged in the valve stem (30) through the central purge cavity (b), and is then blown out through the preset air hole (61) on the guide block (60), the axis of the air hole (61) is parallel to the axis of the valve core (20) or is arranged obliquely along the slope direction of the guide surface of the guide block (60); the main air source enters the air flow channel between the valve core (20) and the valve cavity through the outer purge cavity (a) and is then ejected; The wind force in the air flow channel is greater than the wind force at the air hole (61).

2. The biomass flow control valve with bellows seal according to claim 1, characterized in that: The guide sleeve (70) is coaxially arranged in the valve cavity through the valve cover (110) in a compressed manner. The inner wall of the guide sleeve (70) is radially protruded with guide ribs (71). The inner annular surface formed by the guide ribs (71) constitutes a sliding surface for the valve seat (50) to slide axially, and the gaps between adjacent guide ribs (71) constitute the air flow channel; the flow window (21) is opened between two adjacent guide ribs (71), and the guide sleeve (70) is provided with an avoidance opening (72) for the inner end of the valve seat (50) to pass through.

3. The biomass flow control valve with bellows seal according to claim 2, characterized in that: A secondary purge port (112) for admitting a secondary gas source is provided at the end of the valve cover (110); the secondary gas source enters the sliding gap between the valve stem (30) and the valve cover (110) through the secondary purge port (112), and then enters the purge flow channel (31) through the air inlet (32) on the valve stem (30).

4. The biomass flow control valve with bellows seal according to claim 3, characterized in that: The outer shape of the cylindrical cavity of the valve cover (110) is a two-stage stepped hole with a small diameter at one end close to the valve core (20) and a large diameter at the other end. The small-diameter section of the valve cover (110) is coaxially sleeved with a positioning sleeve (113), so that a transition cavity (c) is formed between the positioning sleeve (113) and the large-diameter section of the valve cover (110); a main purge port (111) for the main gas source to pass through is opened on the side wall of the valve cover (110), and the gas of the main gas source enters the transition cavity (c) through the main purge port (111), and then enters the outer purge cavity (a) through the gap between the positioning sleeve (113) and the end of the valve cover (110), and finally enters the air flow channel.

5. A biomass flow control valve with bellows seal according to claim 2, 3 or 4, characterized in that: Alternatively, the length direction of the guide ribs (71) is parallel to the axial direction of the valve core (20), and each guide rib (71) surrounds the axis of the guide sleeve (70) and is uniformly distributed on the inner wall of the guide sleeve (70); or the length direction of the guide ribs (71) intersects the axial direction of the valve core (20), and each guide rib (71) surrounds the axis of the guide sleeve (70) and is uniformly distributed on the inner wall of the guide sleeve (70) to form a multi-helical structure.

6. A biomass flow control valve with bellows seal according to claim 2, 3 or 4, characterized in that: One end of the guide sleeve (70) close to the medium outlet is pressed against the top of the outlet bushing (81), and the bottom end of the outlet bushing (81) is pressed and fixed by the outlet nipple (82) or the outlet flange. The outlet nipple (82) or the outlet flange is bolted to the valve body (10); the cylindrical cavity of the outlet bushing (81) close to the medium outlet is in the shape of a tapered hole with a gradually decreasing aperture.

7. A biomass flow control valve with bellows seal according to claim 1, 2, 3 or 4, characterized in that: Along the flow direction of the solid phase medium, a transition bushing (91), a lofting bushing (92) and a valve seat (50) are arranged in sequence in the inlet cavity; the transition bushing (91) is pressed and fixed by an inlet nipple (93) or an inlet flange, and the inlet nipple (93) or the inlet flange is bolted to the valve body (10); a sealing ring constituting an elastic member is coaxially sandwiched between the inlet nipple (93) or the inlet flange and the transition bushing (91).

8. The biomass flow control valve with bellows seal according to claim 7, characterized in that: The inner cavity of the lofting bushing (92) is in a smooth transitional structure from a circular inlet to a rectangular outlet.

9. A biomass flow control valve with bellows seal according to claim 1, 2, 3 or 4, characterized in that: The axis of the inlet passage and the axis of the valve core (20) intersect with each other, and the tip of the angle formed points in the direction of the medium outlet.

10. A biomass flow control valve with bellows seal according to claim 1, 2, 3 or 4, characterized in that: The telescopic tube (100) is a bellows.

Images