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CN-224214778-U - Composite safety relief valve

CN224214778UCN 224214778 UCN224214778 UCN 224214778UCN-224214778-U

Abstract

The utility model relates to a composite safety pressure relief valve which comprises a shell and a first piston arranged in the shell, wherein an inner hole of the shell comprises a hole I and a hole II, the outer diameter of the first piston is smaller than the diameter of the hole I and larger than the diameter of the hole II, a first fixing block is arranged on one side, far away from the hole II, of the first piston, the first fixing block is connected with the first piston through a first spring, pressure relief holes are formed in the side wall of a first cavity and the first fixing block, the diameter of a second piston is larger than the diameter of a balance hole and smaller than the diameter of an inner hole of a sleeve, and the second fixing block is connected with the second piston through a second spring. According to the utility model, when the internal pressure of the coupler is too high, the release of the internal pressure of the coupler is realized, and when the internal cooling of the coupler causes the too low pressure, the balance hole is opened through the cooperation of the second spring, the second piston and the balance hole of the first piston, so that the pressure balance inside and outside the coupler is realized, the combination of pressure relief and internal and external balance is realized, and the use safety of the coupler is ensured.

Inventors

  • Fu Shengshuang

Assignees

  • 泰安市德曼驱动机械有限公司

Dates

Publication Date
20260508
Application Date
20250630

Claims (10)

  1. 1. The composite safety pressure release valve is characterized by comprising a shell (5) and a first piston (4) arranged in the shell (5), wherein an inner hole of the shell comprises a hole I and a hole II which are sequentially arranged along the axial direction, the diameter of the hole I is larger than that of the hole II, a step surface (14) is formed at the communication part of the hole I and the hole II, the first piston (4) is positioned in the hole I, the first piston (4) is in sealing contact with the step surface (14), and the outer diameter of the first piston is smaller than that of the hole I and larger than that of the hole II; A first fixed block (1) which is fixedly arranged relative to the shell is arranged on one side of the first piston far away from the hole II, the first fixed block (1) is connected with the first piston (4) through a first spring (2), a first cavity is formed between the first fixed block and the first piston, and a pressure release hole (11) is formed in the side wall of the first cavity and/or the first fixed block; the side sealing rigid coupling that hole I was kept away from to first piston has sleeve (7), has seted up balance hole (3) of intercommunication first cavity and sleeve hole on the first piston, be equipped with second piston (10) that set up relatively with the balance hole in the sleeve, the diameter of second piston is greater than the diameter of balance hole, and is less than the diameter of sleeve hole, one side that the balance hole was kept away from to the second piston is equipped with second fixed block (9) that set up with sleeve relatively fixed, second fixed block (9) are connected with second piston (10) through second spring (6), form the second cavity between second piston and the second fixed block, set up the flow hole of intercommunication second cavity on the second fixed block.
  2. 2. A composite safety relief valve according to claim 1 wherein said sleeve (7) extends into bore II, and a relief passage is formed between the outer side wall of the sleeve and the inner wall of bore II.
  3. 3. A composite safety relief valve according to claim 1 wherein an end face of said first piston is in sealing contact with said stepped surface by a sealing ring (12).
  4. 4. The composite safety pressure relief valve according to claim 1, wherein a fixing groove is formed in the side face, facing the first piston, of the second piston, a sealing gasket (13) is fixedly arranged in the fixing groove, the projection of the balancing hole along the axial direction is located in the projection range of the sealing gasket along the axial direction, and the second piston is in sealing contact with the first piston through the sealing gasket.
  5. 5. The composite safety relief valve according to claim 1, wherein an external thread section (8) is provided on the outer surface of the housing corresponding to the hole II, and extends to an end of the housing away from the hole I.
  6. 6. The composite safety relief valve according to claim 5, wherein the outer contour of the housing corresponding to hole I is regular hexagonal, and the wall thickness of the housing corresponding to hole II is greater than the wall thickness of the housing corresponding to hole I.
  7. 7. The composite safety pressure relief valve of claim 1, wherein the side wall of the first chamber and the first fixed block are provided with pressure relief holes, the pressure relief holes on the side wall of the first chamber are uniformly distributed along the circumferential direction, the pressure relief holes on the first fixed block are axially communicated, the pressure relief holes on the first fixed block are regular hexagons, and the first fixed block is connected with the shell through external threads.
  8. 8. A composite safety relief valve according to claim 1, characterized in that the first spring (2), the first piston (4), the balance hole (3), the second piston (10), the second spring (6) and the sleeve (7) are coaxially arranged.
  9. 9. A composite safety relief valve according to claim 1 wherein said first piston comprises a piston plate and a sealing land (15) extending from the side of said piston plate remote from the first fixed block, the balance hole being located in the center of the piston plate, the outer diameter of said sealing land being greater than the outer diameter of the piston plate and less than the inner diameter of the bore I, the inner diameter of the sealing land being greater than or equal to the inner diameter of the bore II.
  10. 10. The composite safety relief valve according to claim 9, wherein the first spring has an inner diameter greater than the outer diameter of the piston plate and smaller than the outer diameter of the sealing table, and one end of the first spring (2) away from the first fixing block is sleeved on the piston plate and abuts against the sealing table (15).

Description

Composite safety relief valve Technical Field The utility model relates to the technical field of valves, in particular to a safety valve applied to a coupler, and specifically relates to a composite safety pressure relief valve. Background The coupler hydraulic coupler is used as an important power transmission device and is widely applied to the fields of mining machinery, engineering equipment, electric power systems and the like. During operation, the temperature of the working fluid in the coupler rises due to friction and impact, so that the internal pressure is obviously increased. Excessive pressure may cause serious safety accidents such as bursting of the coupler housing, sealing failure and the like. For this purpose, the couplings are usually provided with pressure relief valves, which automatically open the pressure relief when the internal pressure exceeds a set threshold, ensuring the safety of the equipment. However, most of the existing relief valves are one-way relief valves, such as spring type safety relief valves, the steel ball seals the channel by utilizing the elasticity of the spring, and when the internal pressure is high, the elasticity of the spring is overcome, so that the steel ball loses the sealing effect and the internal pressure is released. However, the existing unidirectional pressure relief scheme has obvious defects, for example, when the high-temperature liquid in the coupler is gradually cooled, so that the internal pressure is too low and even reaches below 0.1MPa, at the moment, the unidirectional pressure relief valve cannot reversely open the supplementary gas, so that the air pressure difference is formed between the inside of the coupler and the outside, the sealing assembly is accelerated to wear or lose efficacy due to the negative pressure suction effect, the shell structure is extruded by the external atmospheric pressure to deform, and the transmission efficiency is reduced due to the air tightness damage during restarting. At present, in order to solve the defects of the one-way pressure release valve, the one-way pressure release valve and the air compensating valve are installed simultaneously to form a double-valve structure, and when the valves are installed at different positions respectively, the single-point failure rate is increased, so that the use cost of the double-valve structure is increased, and the installation space is increased. Disclosure of utility model Aiming at the defects of the prior art, the utility model provides the composite safety relief valve, which not only realizes relief and balance, but also saves space and reduces the use cost. The utility model is realized by the following technical scheme, and provides a composite safety pressure release valve, which comprises a shell and a first piston arranged in the shell, wherein an inner hole of the shell comprises a hole I and a hole II which are sequentially arranged along the axial direction, the diameter of the hole I is larger than that of the hole II, a step surface is formed at the communication part of the hole I and the hole II, the first piston is positioned in the hole I, the first piston is in sealing contact with the step surface, and the outer diameter of the first piston is smaller than that of the hole I and larger than that of the hole II; The side of the first piston, which is far away from the hole I, is provided with a sleeve fixedly connected with the side surface of the first piston, which is far away from the hole I, a balance hole communicated with the first chamber and an inner hole of the sleeve, a second piston which is arranged opposite to the balance hole is arranged in the sleeve, the diameter of the second piston is larger than that of the balance hole and smaller than that of the inner hole of the sleeve, a second fixed block which is arranged opposite to the sleeve and is fixed with the second piston is arranged on one side of the second piston, which is far away from the balance hole, and is connected with the second piston through a second spring, a second chamber is formed between the second piston and the second fixed block, and a flow hole communicated with the second chamber is formed in the second fixed block. When the pressure release device is used, the first piston is propped against the step surface through the elasticity of the first spring to realize sealing, the second piston is used for plugging the balance hole through the elasticity of the second spring, when the pressure in the coupler is overlarge, the elasticity of the first spring is overcome, the first piston leaves the step surface to provide a channel for the pressure release in the coupler, after the pressure release, the first piston is in sealing contact with the step surface again under the action of the first spring, when the pressure in the coupler is overlarge, the second piston compresses the second spring under the action of internal and external pressure difference