Double-blocking series drain valve

Abstract

The invention relates to the field of conveying control equipment, and discloses a double-blocking series drain valve which comprises a valve body, a valve element and a valve rod, the valve element is arranged on the inner side of the valve body in a sliding mode in the extending direction of the valve rod, the valve rod penetrates through the valve element and is connected with a plug in a threaded and sleeved mode, and an overflow hole is formed in the side face of the valve element in a penetrating mode. The mode that an existing drain valve simply achieves the medium blocking effect through a valve element is changed, a valve element structure arranged in a carry position in a valve body is arranged, the carry position of a plug is adjusted through the valve rod, the flow of an overflow hole in the middle of the valve element is adjusted, and the flow of the overflow hole is changed along with the change of the flow at the overflow hole. The flow speed of a pressure medium on the outer side of the valve element is also changed, the valve element is pushed by the extending wing to carry through flowing of a carry medium, the valve cavity is plugged, the pipeline is plugged through the pressure difference of the two sides of the valve element, the sealing effect cannot be greatly influenced by abrasion of the valve element, and the service life is long.

Description

Technical Field

[0001] The invention relates to a discharge valve, and relates to the field of valves, and in particular to a double-blocking series discharge valve. Background Art

[0002] A discharge valve is a valve used to control the discharge of fluid in a pipeline. However, it will wear out when used in a pressure vessel. A worn discharge valve is prone to leakage, which may cause safety hazards, thereby increasing the risk of safety hazards, reducing the service life of the equipment and increasing equipment losses. As a result, some multi-stage blocking discharge valve structures have emerged.

[0003] The double-blocking discharge valve in the prior art is usually composed of two valve structures. Two valve bodies are set to increase the blocking effect on the pipeline. Although this structure has a better blocking effect than a single-layer valve body, simply adding a blocking structure cannot avoid the pressure of the medium in the pipeline on the valve body, and it will also increase the equipment cost exponentially. The multi-layer valve body blocking structure also increases the wear on the pipe wall, and generally increases the complexity of the valve body. Once the front valve body leaks, the medium pressure will directly act on the rear valve body. It is just a simple superposition of quantities, and the use effect is not good.

[0004] To this end, technical personnel in this field have proposed a double-blocking series discharge valve. By designing a discharge valve that can increase the blocking effect through medium pressure, the blocking effect can be enhanced by medium pressure when leakage occurs in the valve body, thereby avoiding continuous damage to the rear-end valve body and providing timely feedback to remind maintenance, effectively reducing the risk of medium leakage. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a double-blocking series discharge valve, which replaces the discharge valve in the prior art that simply relies on adding a blocking structure to achieve blocking by designing a valve core with one-way locking through medium pressure. Two groups of this structure are set in opposite directions to block the pressure medium at both ends of the pipeline at the same time, thereby obtaining a valve structure with better use effect than the double-blocking series discharge valve in the prior art, avoiding the problem of poor use effect of the existing equipment.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a double-blocking series discharge valve. The general double-blocking series discharge valve in the prior art usually includes a valve body, a valve core and a valve stem. The valve core is slidably arranged on the inner side of the valve body. One end of the valve stem penetrates the side wall of the valve body and is rotatably connected thereto. One end of the valve stem extends into the inner side of the valve body and penetrates the valve core and is slidably connected thereto. The valve core is driven to advance or deflect on the inner side of the valve body by the valve stem, thereby realizing the blocking of the valve core to the inner cavity of the valve body. A double-blocking series discharge valve is formed by combining two or more structures.

[0007] However, the actual use effect of this structure is not good. Simply adding a blocking structure will increase the cost of the valve exponentially, and only a short-term blocking effect can be obtained. After the pressure medium damages the front-end blocking structure, its pressure directly acts on the rear-end blocking structure, which can only play a simple relief role and cannot actually increase the service life of the valve structure. Therefore, technical personnel in this field have made improvements on the existing discharge valve, hoping to achieve self-tightening of the valve core through the pressure of the pressure medium.

[0008] A tapered valve sleeve is fixedly connected to the low-pressure end of the valve core on the inner wall of the valve body corresponding to the valve core. The tapered valve sleeve forms a valve cavity in the valve body that regularly shrinks toward one end, thereby facilitating the valve core to press against the side of the tapered valve sleeve under the pressure of the medium at one end of the pipeline, thereby blocking the advance of the valve body.

[0009] An overflow hole is formed through the axis of the valve core, and a plug is threadedly connected to the side of the valve stem corresponding to the overflow hole. The plug is driven by the valve stem to advance, thereby controlling the distance between the plug and the overflow hole. The change in the distance is intuitively reflected in the flow of the medium at the overflow hole. When the overflow hole passage becomes smaller, the pressure brought by the medium flow pushes the valve core to move along the direction of the valve stem, thereby achieving a tight blockage between the valve core and the tapered valve sleeve.

[0010] A push block is also provided on the side of the valve stem corresponding to the valve core thread. After the valve core is opened, the push block is driven to advance by rotating the valve stem, and the push block presses against the valve core to continue to advance, thereby ensuring the regulation of the maximum flow of the valve body and avoiding the problem of the valve core blocking the valve body and causing the flow to be too small.

[0011] The valve core comprises a main body, which is slidably arranged inside the valve body along the extension direction of the valve stem, the valve stem penetrates the main body, and the main body is the main structure of the valve core.

[0012] A conical platform is fixedly connected to one end of the main body close to the tapered valve sleeve. The conical platform cooperates with the tapered valve sleeve to advance as the pressure medium at one end of the pipeline acts on the main body, and the medium blocking effect is achieved by the close contact and advancement of the conical platform and the tapered valve sleeve.

[0013] An extension wing is fixedly provided on the side of the main body and away from the conical platform installation side. As the flow at the overflow hole decreases, the flow rate of the medium outside the valve core increases, and the flow of the medium pushes the valve core as a whole to advance through the extension wing, thereby achieving the purpose of blocking the flow of the medium by the medium pressure.

[0014] A spring is arranged between the main body and the valve body. When the structure needs to be closed or opened, the valve stem is rotated to drive the plug to advance. The pressure medium on one side of the valve core communicates with both sides of the valve core through the overflow hole, so that the medium pressure on both sides of the valve core is equal. After the valve core loses the pressure exerted by the medium, it is pushed to move under the elastic force of the spring, thereby continuing to adjust the opening of the valve body.

[0015] Preferably, a fixing ring is fixedly connected to the inner wall of the valve body and located between the tapered valve sleeve and the main body, and an advance rod is rotatably connected to the side of the main body. The end of the advance rod away from the main body passes through the fixing ring and is slidably connected to it, and the spring is tightly arranged between the main body and the fixing ring.

[0016] The fixing ring is fixed to the inner wall of the valve body, and the installation position of the valve core inside the valve body is positioned by the fixing ring. Meanwhile, the advancement rod can also guide the advancement of the valve core inside the valve body.

[0017] Preferably, an advance hole is formed through the side of the fixing ring, the spring is tightly arranged on the inner side of the advance hole, and the side of the advance rod corresponds to the spring thread sleeve with a limit ring. The spring is installed through the advance hole, and the advance hole can be used to achieve anti-corrosion installation of the spring, and the adjustment of the spring elastic force is convenient, thereby avoiding problems such as loose fitting of the equipment and the lack of continuity due to the gap between the plug and the push block.

[0018] Preferably, a protrusion is fixedly connected to the side of the limit ring, and a guide groove is provided on the inner wall of the feed hole corresponding to the protrusion. The limit ring is slidably connected to the guide groove through the protrusion on the side. The limit ring limits the protrusion through the guide groove to achieve adjustment of the installation position in the feed hole, thereby avoiding the problem that the limit ring rotates with the feed rod and cannot adjust the installation position when the feed rod is rotated.

[0019] Preferably, a sealing block is threadedly connected to the end of the carry hole, and the carry rod passes through the sealing block and is slidably connected thereto. The carry hole is sealed and installed by the sealing block, thereby preventing the spring in the carry hole from being corroded by the conveying medium. In addition, the carry hole is sealed by the sealing block, so that the limiting ring threaded on the side of the carry rod can adjust the installation position, thereby realizing the adjustment of the spring elastic force.

[0020] Preferably, the inclined side of the conical platform is fixedly connected to a limiting block, and a sealing rubber gasket is provided on the inclined side of the conical platform and is sleeved between two limiting blocks. The sealing rubber gasket can be installed to achieve sealing by deformation when the conical platform is pressed against the tapered valve sleeve. In addition, the limiting block locates the installation position of the sealing rubber gasket to prevent the sealing rubber gasket from sliding and falling off when squeezed.

[0021] Preferably, the overflow hole runs through the main body and the conical platform, and is a tapered through hole whose opening size gradually shrinks along the medium flow direction. The setting of the tapered through hole facilitates the adjustment of the overflow hole flow by driving the plug to advance.

[0022] A fixing strip is fixedly connected to the inner wall of the overflow hole, and a feed groove is provided on the side of the plug corresponding to the fixing strip. The cooperation between the fixing strip and the feed groove can guide the movement of the plug in the overflow hole, so that the cooperation between the plug and the overflow hole is not limited to the truncated cone structure, and the tight fit between the two is guaranteed to have a sealing effect on the medium.

[0023] Preferably, extension rods are symmetrically fixed on the sides of the push block, and a slide rail is fixedly connected to the inner wall of the valve body corresponding to the extension rod. The push block is arranged inside the valve body through two extension rods on both sides and the slide rail. The push block realizes position adjustment along the valve stem through the limiting guidance of the extension rod by the slide rail.

[0024] Preferably, the side surface of the push block close to one end of the valve core is symmetrically fixedly connected with a fixed block, and the side surface of the fixed block is penetrated and threadedly provided with a pitch adjusting screw. The two threadedly installed pitch adjusting screws can adjust the extension length according to the needs of use, and then cooperate with the plug to adjust the advance of the valve core.

[0025] A limiting groove is provided on the side of the valve core corresponding to the pitch adjusting screw, and the pitch adjusting screw extends into the limiting groove to push the valve core tightly, thereby avoiding the problem of sliding and causing errors due to the tight contact between the conical surface of the conical platform and the pitch adjusting screw.

[0026] Preferably, the valve cavity inside the valve body is configured as a tapered cavity along the medium flow direction, and the valve body inner cavity of the tapered cavity is conducive to applying thrust to the valve core through the extending wings when the medium outside the valve core flows.

[0027] The extending wing is made of a material that is easy to deform, and a closing ring is fixed to the inner wall of the valve cavity of the valve body corresponding to the extending wing. When the extending wing contacts the closing ring, it can continue to move forward by deforming, so that there is a certain buffer space in the matching structure here.

[0028] The present invention discloses a double-blocking series discharge valve, which has the following beneficial effects:

[0029] 1. The double-blocking series discharge valve changes the existing discharge valve's method of simply forming a medium blocking effect through a valve core. A valve core structure that advances in the valve body is arranged. The advance of the plug is adjusted by the valve stem to adjust the flow of the overflow hole in the middle of the valve core. As the flow at the overflow hole changes, the flow rate of the pressure medium on the outside of the valve core also changes. The flow of the advancing medium pushes the valve core to advance through the extended wing to achieve the blocking of the valve cavity. The structure uses the pressure difference on both sides of the valve core to achieve pipeline blocking, and the wear of the valve core will not have a significant impact on the sealing effect, with a long service life.

[0030] 2. The double-blocking series discharge valve adjusts the overflow hole flow by controlling the advance of the plug through the valve stem. When the flow of the overflow hole reaches a certain level, the medium pressures on both sides of the valve core are the same, the valve core loses the thrust of the medium, and the valve core is pushed out by the spring to ensure the flow of the medium from the outside of the valve core. At this time, the distance between the plug and the overflow hole reaches the maximum, and the push block arranged behind the valve core presses against the side of the valve core. With the rotation of the valve stem, the distance between the plug and the valve core remains unchanged, and the push block pushes the valve core to continue to advance, thereby adjusting the flow section of the medium in the valve body and maximizing the adjustment of the medium flow rate in this equipment.

[0031] 3. For the double-blocking series discharge valve, the valve core and the valve body are guided and installed by an advance rod, and the advance rod and the valve core are connected in a rotating manner. A limit ring is threadedly sleeved on the side of the advance rod. The installation position of the limit ring can be adjusted by rotating the advance rod, thereby changing the adjustment of the elastic force of the valve core by the spring. In addition, the installation position of the valve core inside the valve body can also be adjusted, so that the cooperation of various components in the equipment is tighter.

[0032] 4. For the double-blocking series discharge valve, a pitch-adjusting screw is arranged on the side thread of the push block behind the valve core. The push block is pressed against the side wall of the valve core through the pitch-adjusting screw with adjustable extension length. When the valve core is worn to different degrees, the equipment can be calibrated by adjusting the extension length of the pitch-adjusting screw relative to the push block to ensure the push cooperation between the plug and the push block. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 It is a schematic diagram of the installation and driving structure of the valve core of the present invention;

[0036] Figure 3 This is a schematic diagram of the valve core structure of the present invention;

[0037] Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlargement in the middle;

[0038] Figure 5 This is a schematic diagram of the tight installation structure between the valve core and the valve body of the present invention;

[0039] Figure 6 It is a schematic diagram of the valve core and the inner wall of the valve body and the driving structure of the present invention;

[0040] Figure 7 It is a schematic diagram of the installation structure of the valve core and the plug of the present invention;

[0041] Figure 8 For the present invention Figure 6 Enlarged schematic diagram of the structure at point B in the middle.

[0042] In the figure: 1. valve body; 2. valve core; 201. main body; 202. conical platform; 203. extension wing; 204. spring; 3. valve stem; 4. tapered valve sleeve; 5. overflow hole; 6. plug; 7. push block; 8. fixing ring; 9. advance rod; 10. advance hole; 11. limit ring; 12. bump; 13. guide groove; 14. sealing block; 15. limit block; 16. sealing pad; 17. fixing strip; 18. advance groove; 19. extension rod; 20. slide rail; 21. fixing block; 22. pitch adjusting screw; 23. limit groove; 24. closing ring. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The embodiment of the present invention discloses a double-blocking series discharge valve;

[0045] According to the attached Figure 1 As shown, a general double-blocking serial discharge valve in the prior art usually includes a valve body 1, a valve core 2 and a valve stem 3. The valve core 2 is slidably arranged on the inner side of the valve body 1, and one end of the valve stem 3 passes through the side wall of the valve body 1 and is rotatably connected thereto. One end of the valve stem 3 extending into the inner side of the valve body 1 passes through the valve core 2 and is slidably connected thereto. The valve core 2 is driven to advance or deflect on the inner side of the valve body 1 by the valve stem 3, thereby realizing the blocking of the inner cavity of the valve body 1 by the valve core 2. A double-blocking serial discharge valve is formed by combining two or more structures.

[0046] However, the actual use effect of this structure is not good. Simply adding a blocking structure will increase the cost of the valve exponentially, and only a short-term blocking effect can be achieved. When the blocking structure at the front end leaks, it is simply used briefly by the blocking structure at the rear end, rather than avoiding damage to the blocking structure. It does not fundamentally solve the safety hazard of leakage in the existing valve structure during the transportation of pressure media.

[0047] Therefore, it is determined that the double-blocking series discharge valve composed of two general valve combinations in the prior art cannot actually increase the service life of the valve structure. It will not only increase the cost of the equipment exponentially, but also increase the complexity of equipment operation. Therefore, technical personnel in this field have made improvements on the basis of the existing discharge valve, hoping to achieve self-tightening of the valve core 2 through the pressure of the pressure medium, and will not cause leakage problems in its normal use due to the wear of the valve structure.

[0048] According to the attached Figure 2 As shown, a tapered valve sleeve 4 is fixedly connected to the low-pressure end of the valve core 2 on the inner wall of the valve body 1. The tapered valve sleeve 4 forms a valve cavity that regularly contracts toward one end in the valve body 1, so that the valve core 2 can be pressed against the side of the tapered valve sleeve 4 under the pressure of the medium at one end of the pipeline, thereby realizing the forward blocking of the medium delivery in the valve body 1.

[0049] An overflow hole 5 is opened through the axis of the valve core 2, and a plug 6 is threadedly connected to the side of the valve stem 3 corresponding to the overflow hole 5. The plug 6 is driven by the valve stem 3 to advance, thereby controlling the distance between the plug 6 and the overflow hole 5. The change in the distance is intuitively reflected in the change in the flow velocity of the medium at the overflow hole 5. When the flow path of the medium at the overflow hole 5 becomes smaller, the pressure brought by the medium flow pushes the valve core 2 to move along the extension direction of the valve stem 3, thereby realizing the tight blocking of the valve core 2 and the tapered valve sleeve 4.

[0050] A push block 7 is also provided on the side of the valve stem 3 corresponding to the thread of the valve core 2. After the valve core 2 is opened, the push block 7 is driven to advance by rotating the valve stem 3, and the push block 7 presses against the valve core 2 to continue to advance, thereby ensuring the regulation of the maximum flow of the valve body 1 and avoiding the problem of the valve core 2 blocking the valve body 1 and causing the flow to be too small.

[0051] According to the attached Figure 3 and attached Figure 4 As shown, the valve core 2 includes a main body 201, which is slidably arranged on the inner side of the valve body 1 along the extension direction of the valve stem 3, and the valve stem 3 passes through the main body 201. The main body 201 is the main structure of the valve core 2, and other structures are installed by relying on the main body 201.

[0052] A conical platform 202 is fixedly connected to one end of the main body 201 close to the tapered valve sleeve 4. The conical platform 202 cooperates with the tapered valve sleeve 4 to advance as the pressure medium at one end of the pipeline pushes the main body 201, and the conical platform 202 and the tapered valve sleeve 4 are pressed against each other to achieve the effect of blocking the flow of the medium.

[0053] An extension wing 203 is fixedly provided on the side of the main body 201 and away from the installation side of the conical platform 202. As the cut-off flow at the overflow hole 5 decreases, the flow rate of the medium outside the valve core 2 increases, and the flow of the medium pushes the valve core 2 as a whole to advance through the extension wing 203. The advanced conical platform 202 presses against the tapered valve sleeve 4, thereby achieving the purpose of blocking the flow of the medium through the medium pressure.

[0054] A spring 204 is arranged between the main body 201 and the valve body 1. When the structure needs to be closed to open, the valve stem 3 is rotated to drive the plug 6 to advance, and the pressure medium on one side of the valve core 2 communicates with the two sides of the valve core 2 through the overflow hole 5, so that the medium pressure on both sides of the valve core 2 is equal. After the valve core 2 loses the pressure exerted by the medium, it is pushed to move under the elastic force of the spring 204, so that the opening of the valve body 1 can continue to be adjusted.

[0055] According to the attached Figure 4 As shown, a fixing ring 8 is fixedly connected to the inner wall of the valve body 1 and located between the tapered valve sleeve 4 and the main body 201, and an advance rod 9 is rotatably connected to the side of the main body 201. The end of the advance rod 9 away from the main body 201 passes through the fixing ring 8 and is slidably connected thereto, and a spring 204 is tightly arranged between the main body 201 and the fixing ring 8.

[0056] The fixing ring 8 is fixed to the inner wall of the valve body 1 , and the installation position of the valve core 2 inside the valve body 1 is positioned by the fixing ring 8 . Meanwhile, the advancement rod 9 can also guide the advancement of the valve core 2 inside the valve body 1 .

[0057] A feed hole 10 is formed through the side surface of the fixing ring 8 , and the spring 204 is tightly arranged on the inner side of the feed hole 10 . The feed hole 10 can also be used to realize anti-corrosion installation of the spring 204 .

[0058] According to the attached Figure 5 As shown, the side of the advance rod 9 corresponds to the spring 204 threaded sleeve with a limit ring 11, which makes it convenient to adjust the elastic force of the spring 204 by adjusting the installation position of the limit ring 11 on the side of the advance rod 9, so as to avoid problems such as loose fitting of the equipment and the lack of continuity of the fitting gap between the plug 6 and the push block 7. When the plug 6 moves to the limit position, the push block 7 contacts and presses against the valve core 2 from one side of the valve core 2, and then pushes the valve core 2 to continue to move as the valve stem 3 continues to rotate.

[0059] A protrusion 12 is fixedly connected to the side of the limiting ring 11, and a guide groove 13 is opened on the inner wall of the feed hole 10 corresponding to the protrusion 12. The limiting ring 11 is slidably connected with the guide groove 13 through the side protrusion 12. The limiting ring 11 limits the protrusion 12 through the guide groove 13 to achieve adjustment of the installation position in the feed hole 10, thereby avoiding the problem that the limiting ring 11 rotates and cannot adjust the installation position when the feed rod 9 is rotated.

[0060] The end of the carry hole 10 is threadedly connected with a sealing block 14, and the carry rod 9 passes through the sealing block 14 and is slidably connected thereto. The carry hole 10 is sealed and installed by the sealing block 14, thereby preventing the spring 204 in the carry hole 10 from being corroded by the conveying medium. In addition, the carry hole 10 is blocked by the sealing block 14, so that the limit ring 11 threadedly sleeved on the side of the carry rod 9 can adjust the installation position, thereby realizing the adjustment of the elastic force of the spring 204.

[0061] According to the attached Figure 6 As shown, the inclined side of the conical platform 202 is fixedly connected to the limiting block 15, and a sealing rubber pad 16 is provided on the inclined side of the conical platform 202 and is sleeved between the two limiting blocks 15. The sealing rubber pad 16 can be installed to achieve sealing by deformation when the conical platform 202 is pressed against the tapered valve sleeve 4. In addition, the limiting block 15 locates the installation position of the sealing rubber pad 16 to prevent the sealing rubber pad 16 from sliding and falling off when it is squeezed.

[0062] According to the attached Figure 7 As shown, the overflow hole 5 runs through the main body 201 and the conical platform 202, and is a tapered through hole whose opening size gradually shrinks along the medium flow direction. The setting of the tapered through hole facilitates the adjustment of the flow rate of the overflow hole 5 by driving the plug 6 to advance.

[0063] A fixing strip 17 is fixedly connected to the inner wall of the overflow hole 5, and an entry groove 18 is provided on the side of the plug 6 corresponding to the fixing strip 17. The cooperation between the fixing strip 17 and the entry groove 18 can guide the movement of the plug 6 in the overflow hole 5, so that the cooperation between the plug 6 and the overflow hole 5 is not limited to the truncated cone structure, and the sealing effect of the medium on the tight fit between the two is guaranteed.

[0064] According to the attached Figure 6 and attached Figure 8 As shown, the side of the push block 7 is symmetrically fixed with an extension rod 19, and the inner wall of the valve body 1 is fixedly connected with a slide rail 20 corresponding to the extension rod 19. The push block 7 is arranged on the inner side of the valve body 1 through the two extension rods 19 on both sides and the slide rail 20. The push block 7 realizes the advancement adjustment along the valve stem 3 through the limiting guidance of the extension rod 19 by the slide rail 20.

[0065] The side of the push block 7 close to one end of the valve core 2 is symmetrically fixedly connected with a fixed block 21, and the side of the fixed block 21 is penetrated and threaded with an adjusting screw 22. The two threaded adjusting screws 22 can adjust the extension length according to the needs of use, and then cooperate with the plug 6 to adjust the advance of the valve core 2.

[0066] A limit groove 23 is provided on the side of the valve core 2 corresponding to the pitch adjusting screw 22. The pitch adjusting screw 22 extends into the limit groove 23 to push the valve core 2 tightly, so as to avoid the problem of sliding and causing errors due to the tight contact between the conical surface of the conical platform 202 and the pitch adjusting screw 22.

[0067] According to the attached Figure 7 As shown, the valve cavity inside the valve body 1 is configured as a tapered cavity along the medium flow direction. The tapered cavity of the valve body 1 is conducive to applying thrust to the valve core 2 through the extension wing 203 when the medium outside the valve core 2 flows.

[0068] The extension wing 203 is made of a material that is easily deformed, and a closing ring 24 is fixed to the inner wall of the valve cavity of the valve body 1 corresponding to the extension wing 203. When the extension wing 203 contacts the closing ring 24, the extension wing 203 can continue to move forward by deforming, so that there is a certain buffer space in the matching structure here.

[0069] The double-blocking series discharge valve changes the existing discharge valve's method of simply forming a medium blocking effect through the valve core 2. The valve core 2 structure that advances in the valve body 1 is arranged, and the advancement of the plug 6 is adjusted by the valve stem 3 to adjust the flow of the overflow hole 5 in the middle of the valve core 2. As the flow at the overflow hole 5 changes, the flow rate of the pressure medium on the outside of the valve core 2 also changes. The flow of the advancing medium pushes the valve core 2 to advance through the extension wing 203 to achieve the blocking of the valve cavity. The structure uses the pressure difference on both sides of the valve core 2 to achieve pipeline blocking, and the wear of the valve core 2 will not have a significant impact on the sealing effect, and the service life is long.

[0070] Furthermore, the flow of the overflow hole 5 is adjusted by controlling the advancement of the plug 6 through the valve stem 3. When the flow of the overflow hole 5 reaches a certain level, the medium pressures on both sides of the valve core 2 are the same, the valve core 2 loses the thrust of the medium, and the valve core 2 is pushed out by the spring 204 to ensure the flow of the medium from the outside of the valve core 2. At this time, the distance between the plug 6 and the overflow hole 5 reaches the maximum, and the push block 7 arranged behind the valve core 2 presses against the side of the valve core 2. As the valve stem 3 rotates, the distance between the plug 6 and the valve core 2 remains unchanged, and the push block 7 pushes the valve core 2 to continue to advance, thereby realizing the adjustment of the medium flow section in the valve body 1 and realizing the maximum adjustment of the medium flow rate in the device.

[0071] Furthermore, the valve core 2 and the valve body 1 are guided and installed by the advance rod 9, and the advance rod 9 and the valve core 2 are connected in a rotating manner. A limit ring 11 is threadedly sleeved on the side of the advance rod 9. The installation position of the limit ring 11 can be adjusted by rotating the advance rod 9, thereby changing the elastic force of the spring 204 on the valve core 2. In addition, the installation position of the valve core 2 on the inner side of the valve body 1 can also be adjusted, so that the components in the equipment can fit more closely.

[0072] Furthermore, a pitch-adjusting screw 22 is provided on the side thread of the push block 7 behind the valve core 2, and the push block 7 is pressed against the side wall of the valve core 2 through the pitch-adjusting screw 22 with adjustable extension length. When the valve core 2 is worn to different degrees, the equipment can be calibrated by adjusting the extension length of the pitch-adjusting screw 22 relative to the push block 7 to ensure the push cooperation between the plug 6 and the push block 7.

[0073] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A double-blocking serial discharge valve, comprising a valve body (1), a valve core (2) and a valve stem (3), wherein the valve core (2) is slidably arranged inside the valve body (1), one end of the valve stem (3) penetrates through the side wall of the valve body (1) and is rotatably connected thereto, and one end of the valve stem (3) extending into the inside of the valve body (1) penetrates through the valve core (2) and is slidably connected thereto, characterized in that: The inner wall of the valve body (1) is fixedly connected with a tapered valve sleeve (4) corresponding to the low-pressure end of the valve core (2); an overflow hole (5) is penetrated through the axis of the valve core (2); a plug (6) is threadedly connected to the side of the valve stem (3) corresponding to the overflow hole (5); and a push block (7) is also threadedly provided on the side of the valve stem (3) corresponding to the valve core (2); The valve core (2) comprises a main body (201), the main body (201) is slidably arranged on the inner side of the valve body (1) along the extension direction of the valve stem (3), one end of the main body (201) close to the tapered valve sleeve (4) is fixedly connected to a conical platform (202), an extension wing (203) is fixedly arranged on the side of the main body (201) and away from the installation side of the conical platform (202), and a spring (204) is arranged between the main body (201) and the valve body (1).

2. The double-block tandem drain valve according to claim 1, characterized in that: A fixing ring (8) is fixedly connected to the inner wall of the valve body (1) and located between the tapered valve sleeve (4) and the main body (201); an advancing rod (9) is rotatably connected to the side of the main body (201); an end of the advancing rod (9) away from the main body (201) passes through the fixing ring (8) and is slidably connected thereto; and the spring (204) is tightly arranged between the main body (201) and the fixing ring (8).

3. The double-block tandem drain valve according to claim 2, characterized in that: The side surface of the fixing ring (8) is provided with an advance hole (10), the spring (204) is tightly arranged on the inner side of the advance hole (10), and the side surface of the advance rod (9) is threadedly sleeved with a limit ring (11) corresponding to the spring (204).

4. The double-block tandem drain valve according to claim 3, characterized in that: A protrusion (12) is fixedly connected to the side of the limiting ring (11), and a guide groove (13) is provided on the inner wall of the feed hole (10) corresponding to the protrusion (12). The limiting ring (11) is slidably connected to the guide groove (13) via the protrusion (12) on the side.

5. The double-block tandem drain valve according to claim 3, characterized in that: The end of the advancement hole (10) is threadedly connected with a sealing block (14), and the advancement rod (9) passes through the sealing block (14) and is slidably connected thereto.

6. The double block series drain valve according to claim 1, characterized in that: The inclined surface side of the conical platform (202) is fixedly connected to a limiting block (15), and a sealing rubber pad (16) is sleeved and arranged on the inclined surface side of the conical platform (202) through and between two limiting blocks (15).

7. The double block series drain valve according to claim 1, characterized in that: The overflow hole (5) penetrates the main body (201) and the conical platform (202) and is a tapered through hole whose opening size gradually shrinks along the flow direction of the medium. A fixing strip (17) is fixedly connected to the inner wall of the overflow hole (5), and a carry groove (18) is provided on the side of the plug (6) corresponding to the fixing strip (17).

8. The double block series drain valve according to claim 1, characterized in that: Extension rods (19) are symmetrically fixed to the side surfaces of the push block (7); a slide rail (20) is fixedly connected to the inner wall of the valve body (1) corresponding to the extension rods (19); and the push block (7) is arranged on the inner side of the valve body (1) by cooperating with the slide rail (20) through two extension rods (19) on both sides.

9. The double block series drain valve according to claim 1, characterized in that: A fixed block (21) is symmetrically fixedly connected to the side surface of the push block (7) close to one end of the valve core (2); a pitch adjusting screw (22) is threadedly provided through the side surface of the fixed block (21); and a limiting groove (23) is provided on the side surface of the valve core (2) corresponding to the pitch adjusting screw (22).

10. The double block series drain valve according to claim 1, characterized in that: The valve cavity inside the valve body (1) is arranged as a tapered cavity that tapers along the medium flow direction; the extension wing (203) is made of a material that is easily deformed; and a constricting ring (24) is fixed to the inner wall of the valve cavity of the valve body (1) corresponding to the extension wing (203).

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