Low-flow-resistance forged steel swing check valve

Abstract

The invention discloses a low-flow-resistance forged steel swing check valve, which belongs to the technical field of valves, and comprises a valve seat in which a sealing ring is fixedly mounted; a valve rod is fixedly mounted in the valve body, the valve rod is rotatably mounted in the valve seat, two groups of O-shaped rings are arranged on the outer side of the valve body, and a worm gear is fixedly mounted at one end of the valve rod; the gear box is arranged on one side of the valve seat, a driving shaft, a transmission shaft, a connecting shaft and a worm are rotationally arranged in the gear box, a locking mechanism is arranged between the worm and the connecting shaft, and the locking mechanism comprises a round shell, a sliding lock disc, a fixed lock ring and a connecting cylinder. The valve seat and the sealing ring are made of all-metal materials, abrasion and damage of impurities in media to the sealing ring are eradicated, long-term reliability of sealing is guaranteed, the sealing performance is further improved through two sealing defense lines formed by the O-shaped ring, and the anti-loosening and anti-mistaken-touch effects are improved through the arranged locking mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a low-flow-resistance forged steel swing check valve. Background Art

[0002] At present, most domestic long-distance heat supply pipelines still use manual valves.

[0003] Since long-distance pipelines are all buried (that is, the cultivated land, roads, etc. are dug open before construction, and then backfilled and restored after the pipeline is laid), in order to facilitate the installation of valves and subsequent maintenance, valve wells need to be built. In order to reduce the impact on the environment, valve wells usually have 2-4 maintenance manholes reserved. When the valve needs to be opened or closed, the maintenance hole is opened for ventilation, and then personnel go down to operate the valve, or conduct inspections, maintenance, repairs and other operations on the valve. This method is relatively dangerous, and the anti-miscontact and anti-loosening effects of traditional buried types are relatively poor. The invention is prone to micro-movement during long-term use, affecting the sealing effect; therefore, we propose a low-flow-resistance forged steel swing check valve to solve this problem. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-flow-resistance forged steel swing check valve to solve the problems raised in the above background art.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A low-flow-resistance forged steel swing check valve, comprising: A valve seat, in which a sealing ring is fixedly installed. A valve body, in which a valve stem is fixedly installed. The valve stem is rotatably installed in the valve seat. Two sets of O-rings are arranged on the outer side of the valve body. One end of the valve stem is fixedly installed with a worm gear. A gear box, arranged on one side of the valve seat. A drive shaft, a transmission shaft, a connecting shaft and a worm are rotatably arranged in the gear box. A locking mechanism is arranged between the worm and the connecting shaft. The locking mechanism includes a circular shell, a sliding lock disc, a fixed lock ring and a connecting cylinder.

[0006] Preferably, the circular shell is fixedly connected to one end of the worm. A plurality of locking teeth are integrally formed on the outer side of the sliding lock disc. The sliding lock disc is slidably connected in the circular shell. An arc-shaped protrusion and a square baffle are integrally formed inside the sliding lock disc. A plurality of locking grooves are formed inside the fixed lock ring. The locking teeth are movably clamped in the corresponding locking grooves. Two push plates are fixedly connected to the outer side of the connecting cylinder. The push plates are adapted to the arc-shaped protrusion and the square baffle. The fixed lock ring is fixedly installed in the gear box; On the inner wall of the circular shell, a touch button, a compression spring and a fixed shaft are fixedly connected. The other end of the compression spring is fixedly connected to a sliding lock plate. A positioning disk is fixedly sleeved outside the fixed shaft. The positioning disk is rotatably installed in the connecting cylinder, and a torsion spring is fixedly connected to one side of the positioning disk. The other end of the torsion spring is fixedly connected to the inner wall of the connecting cylinder.

[0007] Preferably, the worm is meshed with the worm gear, and an internal gear ring is fixedly sleeved outside the connecting shaft. Small gears and driven bevel gears are respectively fixedly installed at both ends of the transmission shaft. The small gears are meshed with the internal gear ring. One end of the drive shaft is fixedly connected to a driving bevel gear. The driving bevel gear is meshed with the driven bevel gear; The other end of the drive shaft is fixedly connected to a handle, and a switch angle mark is arranged on one side of the handle.

[0008] Preferably, the gearbox includes a mounting shell, a rear cover, a connecting shell, a connecting cover, an intermediate ring and a turning shell. The mounting shell, the rear cover, the connecting shell, the connecting cover, the intermediate ring and the turning shell are fixedly connected in sequence. A positioning cylinder is fixedly connected to one side of the turning shell. The drive shaft is rotatably installed in the positioning cylinder.

[0009] Preferably, an alarm is fixedly connected to one side of the valve seat. The alarm is in signal connection with the touch button.

[0010] The beneficial effects of the present invention are as follows: 1. In the present invention, for the low-flow-resistance forged steel swing check valve, both the valve seat and the sealing ring are made of all-metal materials, fundamentally eliminating the wear and damage of the sealing ring caused by impurities in the medium, ensuring the long-term reliability of the seal. The two sealing defense lines formed by the O-ring can still effectively block the external leakage of the medium even in the extreme case of the failure of one seal, providing a solid guarantee for the safe operation of the heating system. The built-in packing seal further strengthens the overall sealing performance of the valve, reducing the risk of medium leakage to the lowest level when the valve is in the closed state, effectively avoiding energy waste and environmental pollution caused by leakage, and ensuring the efficient and stable operation of the heating system; 2. In the present invention, for the low-flow-resistance forged steel swing check valve, through the precise cooperation among the circular shell, the sliding lock plate, the fixed lock ring and the connecting cylinder, the stable locking of the worm gear is achieved. During normal operation, all components cooperate closely to ensure that the worm gear will not rotate accidentally, thus ensuring the stability of the valve body. When the valve needs to be operated, the manual control handle drives the drive shaft to rotate, causing the push plate to push the sliding lock plate to slide within the circular shell, compressing the compression spring and twisting the torsion spring. After the locking teeth are disengaged from the locking groove, the circular shell is released from fixation, allowing the worm gear and subsequent components to move orderly. After the operation is completed, under the reset action of the torsion spring, the sliding lock plate automatically resets and relocks the worm gear. The whole process is stable and reliable, effectively preventing the valve body from loosening caused by misoperation or external interference, ensuring the stability and safety of the heating system, and extending the service life of the equipment. 3. In the present invention, for the low-flow-resistance forged steel swing check valve, the multi-stage gear meshing structure is the key to achieving precise valve control. The meshing transmissions between the driving bevel gear and the driven bevel gear, the pinion and the internal gear ring, and the worm gear and the worm wheel form an efficient speed reduction and torque increase system. This design enables the small rotation of the drive shaft to be amplified through multiple stages and accurately control the rotation angle of the valve stem, thereby achieving precise adjustment of the medium flow rate. Whether in the process of opening or closing the valve, the operator only needs to slightly rotate the handle to achieve slow and smooth opening and closing of the valve, avoiding water hammer phenomena or sudden changes in the medium flow rate caused by rapid actions, ensuring the pressure stability of the heating system, meeting different heating requirements, and improving the comfort and energy utilization efficiency of heating. 4. In the present invention, for the low-flow-resistance forged steel swing check valve, the meshing combination of the driving bevel gear and the driven bevel gear, and the pinion and the internal gear ring significantly reduces the rotation speed of the connecting shaft. Since the number of teeth of the driving bevel gear is much smaller than that of the driven bevel gear, and the number of teeth of the pinion is much smaller than that of the internal gear ring, according to the gear transmission ratio principle, the rotation speed of the connecting shaft is greatly reduced compared to the drive shaft. This means that in the case of accidental contact, even if the drive shaft rotates to a certain extent, the rotation angle of the connecting shaft is extremely limited, thereby ensuring the stability of the valve body. At the same time, the high transmission ratio characteristic of the multi-stage gear meshing makes the operation more labor-saving and reduces the possibility of accidental contact caused by operation fatigue. In addition, the design of the push plate and the square baffle in the locking mechanism further increases the difficulty of controlling accidental contact. Only after the push plate contacts the square baffle will it drive the connecting shaft to rotate, greatly reducing the risk of accidental contact and effectively protecting the safe and stable operation of the heating system. 5. In the present invention, for the low-flow-resistance forged steel swing check valve, the signal connection between the alarm and the touch button adds an important safety line to the heating system. During the normal operation of the equipment, once an abnormal operation causes the drive shaft to rotate a certain angle (as long as it does not reach the degree of contact between the push plate and the square protrusion), or when the equipment itself fails to trigger the alarm condition, the touch button will immediately transmit the signal to the alarm, and the alarm will immediately emit a prominent alarm sound, reminding the operator to stop the operation in time and check the equipment status. This timely warning function can avoid more serious problems caused by misoperation or equipment failure, such as excessive opening or closing of the valve, abnormal pipeline pressure, etc., ensuring that the operator can quickly take corresponding measures to guarantee the safe and stable operation of the heating system and reduce potential economic losses and safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 FIG. is a three-dimensional structural schematic diagram of a low-flow-resistance forged steel swing check valve proposed by the present invention; Figure 2 FIG. is an exploded three-dimensional structural schematic diagram of a low-flow-resistance forged steel swing check valve proposed by the present invention; Figure 3 FIG. is a sectional structural schematic diagram of a low-flow-resistance forged steel swing check valve proposed by the present invention; Figure 4 FIG. is another sectional structural schematic diagram of a low-flow-resistance forged steel swing check valve proposed by the present invention; Figure 5 FIG. is an overall exploded three-dimensional structural schematic diagram of a low-flow-resistance forged steel swing check valve proposed by the present invention; Figure 6 FIG. is a partial exploded three-dimensional structural schematic diagram of a low-flow-resistance forged steel swing check valve proposed by the present invention; Figure 7 FIG. is a partial three-dimensional structural schematic diagram of a low-flow-resistance forged steel swing check valve proposed by the present invention; Figure 8 FIG. is a partial sectional structural schematic diagram of a low-flow-resistance forged steel swing check valve proposed by the present invention; Figure 9 is Figure 8 a partial enlarged view of part A in Figure 10 FIG. is a schematic diagram of the partial structural disassembly of a low-flow-resistance forged steel swing check valve proposed by the present invention; Figure 11 FIG. is a three-dimensional structural schematic diagram of the sliding lock disc and the connecting cylinder proposed by the present invention.

[0012] In the figure: 1, valve seat; 2, valve body; 201, O-ring; 202, valve stem; 203, worm gear; 3, mounting shell; 4, rear cover; 401, worm; 5, drive shaft; 501, handle; 502, driving bevel gear; 503, positioning cylinder; 6, transmission shaft; 601, driven bevel gear; 602, pinion gear; 7, connecting shaft; 701, internal gear ring; 702, connecting cylinder; 703, torsion spring; 704, positioning disk; 705, fixed shaft; 706, push plate; 8, fixed lock ring; 9, sliding lock disk; 901, arc-shaped protrusion; 902, square baffle; 903, locking tooth; 904, compression spring; 905, touch button; 10, alarm; 11, turning shell; 12, intermediate ring; 13, connecting shell; 14, round shell. Specific embodiments

[0013] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0014] Referring to Figures 1 - 11 , a low-flow-resistance forged steel swing check valve, comprising: Valve seat 1, in which a sealing ring is fixedly installed. Both the valve seat 1 and the sealing ring are made of all-metal, which can avoid the damage of the sealing ring by particles such as sediment mixed in the pipeline medium; Valve body 2, in which a valve stem 202 is fixedly installed. The valve stem 202 is rotatably installed in the valve seat 1. Two groups of O-rings 201 are arranged on the outer side of the valve body 2. One end of the valve stem 202 is fixedly installed with a worm gear 203. There is a certain play gap between the valve seat 1 and the valve body 2, so that the cooperation and sealing state of the valve seat 1 and the sealing ring under different pressure states are different, thereby realizing the ability of double-sided sealing. Through the sealing of two O-rings, even if the previous sealing fails, the leakage of the medium can be effectively blocked. In addition, an internal packing seal is adopted to improve the sealing performance; Gearbox, arranged on one side of the valve seat 1. In the gearbox, a drive shaft 5, a transmission shaft 6, a connecting shaft 7 and a worm 401 are rotatably arranged. A locking mechanism is arranged between the worm 401 and the connecting shaft 7. The locking mechanism includes a round shell 14, a sliding lock disk 9, a fixed lock ring 8 and a connecting cylinder 702.

[0015] In this embodiment, the circular shell 14 is fixedly connected to one end of the worm 401. A plurality of locking teeth 903 are integrally formed on the outer side of the sliding lock plate 9. The sliding lock plate 9 is slidably connected inside the circular shell 14. An arc-shaped protrusion 901 and a square baffle 902 are integrally formed inside the sliding lock plate 9. A plurality of locking grooves are formed inside the fixed lock ring 8. The locking teeth 903 are movably clamped in the corresponding locking grooves. Two push plates 706 are fixedly connected to the outer side of the connecting cylinder 702. The push plates 706 are adapted to the arc-shaped protrusion 901 and the square baffle 902. The fixed lock ring 8 is fixedly installed in the gearbox; A touch button 905, a compression spring 904 and a fixed shaft 705 are fixedly connected to the inner wall of the circular shell 14. The other end of the compression spring 904 is fixedly connected to the sliding lock plate 9. A positioning disk 704 is fixedly sleeved on the outer side of the fixed shaft 705. The positioning disk 704 is rotatably installed inside the connecting cylinder 702. One side of the positioning disk 704 is fixedly connected to a torsion spring 703. The other end of the torsion spring 703 is fixedly connected to the inner wall of the connecting cylinder 702.

[0016] In this embodiment, the worm 401 meshes with the worm wheel 203. An internal gear ring 701 is fixedly sleeved on the outer side of the connecting shaft 7. Small gears 602 and driven bevel gears 601 are respectively fixedly installed at both ends of the transmission shaft 6. The small gears 602 mesh with the internal gear ring 701. One end of the drive shaft 5 is fixedly connected to a driving bevel gear 502. The driving bevel gear 502 meshes with the driven bevel gear 601; The other end of the drive shaft 5 is fixedly connected to a handle 501. A switch angle mark is arranged on one side of the handle 501.

[0017] In this embodiment, the gearbox includes an installation shell 3, a rear cover 4, a connecting shell 13, a connecting cover, an intermediate ring 12 and a turning shell 11. The installation shell 3, the rear cover 4, the connecting shell 13, the connecting cover, the intermediate ring 12 and the turning shell 11 are fixedly connected in sequence. A positioning cylinder 503 is fixedly connected to one side of the turning shell 11. The drive shaft 5 is rotatably installed inside the positioning cylinder 503. A static seal structure design is adopted between the positioning cylinder 503 and the gearbox, and there is no external leakage. The top of the gearbox is integrally sealed by a cover plate. The valve stem 202 has no external leakage structure, and there is no risk of external leakage of the medium. A sealing cover is fixedly installed on one side of the valve seat 1. One end of the valve stem 202 is rotatably installed inside the sealing cover to further improve the sealing effect.

[0018] In this embodiment, an alarm 10 is fixedly connected to one side of the valve seat 1. The alarm 10 is signal-connected to the touch button 905.

[0019] In this embodiment, during use, the driving shaft 5 is driven to rotate by manually controlling the handle 501. The driving shaft 5 drives the transmission shaft 6 to rotate through the meshing of the driving bevel gear 502 and the driven bevel gear 601. The transmission shaft 6 drives the connecting shaft 7 to rotate through the meshing of the pinion gear 602 and the internal gear ring 701. The connecting shaft 7 drives the connecting cylinder 702 to rotate synchronously. The connecting cylinder 702 pushes the sliding locking disc 9 to slide within the circular housing 14 through the abutment of the push plate 706 and the arc-shaped protrusion 901, compresses the compression spring 904, and causes the torsion spring 703 to undergo torsional deformation. When the locking teeth 903 on the sliding locking disc 9 disengage from the locking groove, the circular housing 14 is released from fixation. When the push plate 706 contacts the square protrusion, the sliding locking disc 9 is pushed to rotate. The sliding locking disc 9 drives the circular housing 14 and the worm 401 to rotate. The worm 401 drives the valve stem 202 and the valve body 2 to rotate through the meshing with the worm gear 203, thereby realizing the opening and closing control of the valve body 2. After the control is completed, the handle 501 is released, so that the connecting cylinder 702 resets under the action of the torsion spring 703, and drives the push plate 706 and the handle 501 to reset. Then, the sliding locking disc 9 resets under the action of the compression spring 904, and the locking teeth 903 are reinserted into the locking groove to fix the circular housing 14, thereby locking the worm 401, the worm gear 203, the valve body 2, and the valve stem 202, preventing the valve body 2 from loosening, ensuring the stability of the opening and closing control, and thus ensuring the sealing performance; When there is accidental contact and the driving shaft 5 rotates by a certain angle, as long as the push plate 706 does not contact the square protrusion, the stability of the valve body 2 can be ensured. Moreover, the number of teeth of the driving bevel gear 502 is much smaller than that of the driven bevel gear 601, and the number of teeth of the pinion gear 602 is much smaller than that of the internal gear ring 701. As a result, the rotation angle of the connecting shaft 7 is much smaller than the rotation angle of the driving shaft 5, further reducing the risk of accidental contact. In addition, the above-mentioned transmission and the worm 401 and the worm gear 203 are both deceleration transmissions with a high transmission ratio, which can achieve the effect of saving effort and making the operation more labor-saving; Moreover, when the push plate 706 pushes the sliding locking disc 9 to move horizontally, it can squeeze the touch button 905 and control the alarm 10 to start, reminding that it is in the operation stage. If there is an accidental contact situation, it can be detected in time and corresponding measures can be taken to avoid the influence caused by accidental contact.

[0020] The above has introduced in detail a low-flow-resistance forged steel swing check valve provided by the present invention. Specific embodiments are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A low-flow-resistance forged steel swing check valve, characterized in that, Comprising: A valve seat (1) with a sealing ring fixedly installed therein; A valve body (2) with a valve stem (202) fixedly installed inside. The valve stem (202) is rotatably installed in the valve seat (1). There are two sets of O-rings (201) arranged on the outer side of the valve body (2), and a worm gear (203) is fixedly installed at one end of the valve stem (202); A gearbox is arranged on one side of the valve seat (1). Inside the gearbox, a drive shaft (5), a transmission shaft (6), a connecting shaft (7), and a worm (401) are rotatably arranged. A locking mechanism is arranged between the worm (401) and the connecting shaft (7). The locking mechanism includes a circular shell (14), a sliding locking disc (9), a fixed locking ring (8), and a connecting cylinder (702).

2. The low-flow-resistance forged steel swing check valve according to claim 1, characterized in that, The circular shell (14) is fixedly connected to one end of the worm (401). A plurality of locking teeth (903) are integrally formed on the outer side of the sliding locking disc (9). The sliding locking disc (9) is slidably connected inside the circular shell (14). An arc-shaped protrusion (901) and a square baffle (902) are integrally formed inside the sliding locking disc (9). A plurality of locking grooves are formed inside the fixed locking ring (8), and the locking teeth (903) are movably clamped in the corresponding locking grooves. Two push plates (706) are fixedly connected to the outer side of the connecting cylinder (702). The push plates (706) are adapted to the arc-shaped protrusion (901) and the square baffle (902), and the fixed locking ring (8) is fixedly installed inside the gearbox; A touch button (905), a compression spring (904), and a fixed shaft (705) are fixedly connected to the inner wall of the circular shell (14). The other end of the compression spring (904) is fixedly connected to the sliding locking disc (9). A positioning disc (704) is fixedly sleeved on the outer side of the fixed shaft (705). The positioning disc (704) is rotatably installed inside the connecting cylinder (702), and a torsion spring (703) is fixedly connected to one side of the positioning disc (704). The other end of the torsion spring (703) is fixedly connected to the inner wall of the connecting cylinder (702).

3. The swing check valve made of forged steel with low flow resistance according to claim 1, wherein The worm (401) meshes with the worm gear (203). An internal gear ring (701) is fixedly sleeved on the outer side of the connecting shaft (7). Small gears (602) and driven bevel gears (601) are respectively fixedly installed at both ends of the transmission shaft (6). The small gears (602) mesh with the internal gear ring (7), and a driving bevel gear (502) is fixedly connected to one end of the drive shaft (5). The driving bevel gear (502) meshes with the driven bevel gear (601); The other end of the drive shaft (5) is fixedly connected to a handle (501), and a switch angle mark is arranged on one side of the handle (501).

4. The low-flow-resistance forged steel swing check valve according to claim 1, characterized in that, The gearbox includes a mounting shell (3), a rear cover (4), a connecting shell (13), a connecting cover, an intermediate ring (12) and a turning shell (11). The mounting shell (3), the rear cover (4), the connecting shell (13), the connecting cover, the intermediate ring (12) and the turning shell (11) are fixedly connected in sequence. A positioning cylinder (503) is fixedly connected to one side of the turning shell (11), and the drive shaft (5) is rotatably mounted in the positioning cylinder (503).

5. The low-flow-resistance forged steel swing check valve according to claim 1, wherein An alarm (10) is fixedly connected to one side of the valve seat (1), and the alarm (10) is in signal connection with the touch button (905).

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