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CN-224214775-U - Negative pressure integrated valve with switch function

CN224214775UCN 224214775 UCN224214775 UCN 224214775UCN-224214775-U

Abstract

The utility model discloses a negative pressure integrated valve with a switching function, which belongs to the technical field of valves and comprises an integrated valve body, wherein a switching valve core and a pressure limiting valve core are arranged on the integrated valve body, the switching valve core is used for controlling the conduction and the cutoff of a fluid channel, and the pressure limiting valve core is used for controlling the conduction and the cutoff of the fluid channel and the external atmosphere according to the pressure in the fluid channel. The negative pressure integrated valve with the switch function integrates the switch valve and the pressure limiting valve functions, has a compact structure, and reduces the use of independent components. The switching valve function can conduct or cut off a channel communicated with the pressure air source, and the channel can be cut off by closing the switching valve after the pressure air source is closed. The pressure limiting valve function can limit the pressure in the container, so that the system can stably output the negative pressure in a set range when adopting different pressure air sources, and equipment damage and safety accidents caused by different air source pressures are avoided.

Inventors

  • QIAO ZHENG
  • HE GANG

Assignees

  • 济南天工仪器有限公司

Dates

Publication Date
20260508
Application Date
20250624

Claims (10)

  1. 1. The negative pressure integrated valve with the switching function comprises an integrated valve body, wherein a fluid channel is arranged on the integrated valve body in a penetrating way, and two ports of the fluid channel respectively form a first air guide port and a second air guide port; The integrated valve comprises an integrated valve body, a first valve cavity, a switch valve core and a valve rod, wherein the integrated valve body is provided with the first valve cavity, the first valve cavity is communicated with a fluid channel, one end of the switch valve core is inserted into the first valve cavity, and the switch valve core is used for controlling the conduction and the cutoff of the fluid channel; A second valve cavity is arranged on the pressure limiting valve core or the integrated valve body, the second valve cavity is provided with an outer port communicated with the external atmosphere and an inner port directly or indirectly communicated with the fluid channel, the pressure limiting valve core is inserted into the second valve cavity and is used for controlling the conduction and cutoff of the fluid channel and the external atmosphere according to the pressure in the fluid channel.
  2. 2. The negative pressure integrated valve with a switching function according to claim 1, wherein a switching flow passage is provided through an end portion of a switching valve core inserted into the first valve cavity, the switching valve core is rotatable relative to the first valve cavity, a rotation axis of the switching valve core is perpendicular to an axis of the fluid passage and an axis of the switching flow passage, and the switching valve core enables the switching flow passage to be in a state of being conducted or cut off with the fluid passage during rotation.
  3. 3. The negative pressure integrated valve with a switching function according to claim 1, wherein the pressure limiting valve core comprises a pressure limiting valve core body, a ball body and a spring.
  4. 4. The negative pressure integrated valve with a switching function according to claim 3, wherein when the second valve cavity is opened on the switching valve core, an outer port of the second valve cavity is communicated with the external atmosphere, and an inner port of the second valve cavity is communicated with the switching flow channel; The pressure limiting valve core body is provided with a pressure limiting flow passage in a penetrating way, the pressure limiting flow passage is provided with an outer port communicated with the outside atmosphere, and also is provided with an inner port communicated with the second valve cavity, and the inner diameter of the outer port of the pressure limiting flow passage is smaller than the inner diameter of the middle part of the pressure limiting flow passage; the ball body is arranged in the pressure limiting flow channel and is close to the outer port of the pressure limiting flow channel, the diameter of the ball body is larger than the inner diameter of the outer port of the pressure limiting flow channel, two ends of the spring are respectively abutted to the ball body and the cavity wall around the inner port of the second valve cavity, and the ball body is abutted to the outer port of the pressure limiting flow channel under the action of spring force.
  5. 5. The negative pressure integrated valve with a switching function according to claim 3, wherein when the second valve cavity is formed on the integrated valve body, the second valve cavity and the first valve cavity are staggered or are opposite to each other along the axial direction of the fluid channel.
  6. 6. The negative pressure integrated valve with a switching function according to claim 5, wherein a pressure limiting flow passage is provided on the pressure limiting valve core body in a penetrating manner, the pressure limiting flow passage has an outer port communicated with the outside atmosphere, and an inner port communicated with the second valve cavity, and the inner diameter of the pressure limiting flow passage outer port is smaller than the inner diameter of the pressure limiting flow passage middle part; the ball body is arranged in the pressure limiting flow channel and is close to the outer port of the pressure limiting flow channel, the diameter of the ball body is larger than the inner diameter of the outer port of the pressure limiting flow channel, two ends of the spring are respectively abutted to the ball body and the cavity wall around the inner port of the second valve cavity, and the ball body is abutted to the outer port of the pressure limiting flow channel under the action of spring force.
  7. 7. The negative pressure integrated valve with a switching function according to claim 5, wherein when the second valve cavity and the first valve cavity are staggered from each other along the axial direction of the fluid channel, the second valve cavity penetrates through the integrated valve body, the second valve cavity is provided with a first port and a second port which are communicated with the external atmosphere, and the inner diameter of the second port of the second valve cavity is smaller than the inner diameter of the middle part of the second valve cavity; The pressure limiting valve core body is inserted into the first port of the second valve cavity, the ball body is positioned at the second port of the second valve cavity, the diameter of the ball body is larger than the inner diameter of the second port of the second valve cavity, two ends of the spring respectively lean against the ball body and the pressure limiting valve core body, and the ball body is abutted against the second port of the second valve cavity under the action of spring force.
  8. 8. The negative pressure integrated valve with the switching function according to claim 5, wherein when the second valve cavity and the first valve cavity are arranged opposite to each other along the axial direction of the fluid channel, the second valve cavity is directly communicated with the first valve cavity, a conducting runner is arranged on the end face of the switching valve core facing the second valve cavity, and two ports of the conducting runner are respectively communicated with the switching runner and the first valve cavity.
  9. 9. The negative pressure integrated valve with a switching function according to claim 1, wherein sealing rings are arranged on the contact surface of the switching valve core and the first valve cavity and the contact surface of the pressure limiting valve core body and the second valve cavity.
  10. 10. The negative pressure integrated valve with switching function according to claim 1, wherein the pressure limiting valve core body is screwed with the second valve chamber.

Description

Negative pressure integrated valve with switch function Technical Field The utility model relates to a negative pressure integrated valve with a switching function, and belongs to the technical field of valves. Background The negative pressure system is widely applied in the fields of laboratories, chemical production, medical treatment and the like, for example, when the negative pressure suction filtration equipment in the laboratory works, a threshold value of a pressure relief valve needs to be set, if the negative pressure value reaches minus 0.08MPa, the negative pressure is maintained, and after the negative pressure value exceeds the threshold value, the redundant negative pressure needs to be removed, so that the vacuum pressure environment is maintained. In the process of loading and unloading, chemical enterprises monitor the pressure change in the tank body by utilizing a negative pressure switch, and when the pressure exceeds a safety range (such as +0.3MPa or-0.02 MPa), loading and unloading are automatically suspended and an alarm is given, so that the tank body is prevented from being deformed due to pressure unbalance, and medium expansion pressure caused by temperature change is required to be balanced through a pressure limiting valve in the transportation process, so that overpressure explosion is avoided. In the process of medical diagnosis, treatment and scientific research, a medical institution also uses a negative pressure limiting valve, for example, in a dialysate circuit, the transmembrane pressure needs to be controlled within the range of 100-300mmHg by using the limiting valve, toxin removal efficiency is ensured, meanwhile, red blood cell rupture is avoided, furthermore, the pressure of a pipeline behind a blood pump needs to be monitored by using a negative pressure switch, and when blood coagulation or pipeline discount occurs to cause pressure sudden rise (for example, more than 300 mmHg), the blood pump is immediately alarmed and suspended, so that the risk of thromboembolism is prevented. The utility model aims to provide a novel valve to solve the defects of unstable pressure, complex valve structure and the like of the traditional negative pressure system. Disclosure of utility model The utility model aims to solve the problems in the prior art, and provides a negative pressure integrated valve with a switch function, so that the system can stably output negative pressure in a set range when adopting different pressure air sources, and equipment damage and safety accidents caused by different air source pressures are avoided. The utility model realizes the aim by adopting the following technical scheme: The negative pressure integrated valve with the switching function comprises an integrated valve body, wherein a fluid channel is arranged on the integrated valve body in a penetrating manner, two ports of the fluid channel respectively form a first air guide port and a second air guide port, and a switching valve core and a pressure limiting valve core are arranged on the integrated valve body; The integrated valve comprises an integrated valve body, a first valve cavity, a switch valve core and a valve rod, wherein the integrated valve body is provided with the first valve cavity, the first valve cavity is communicated with a fluid channel, one end of the switch valve core is inserted into the first valve cavity, and the switch valve core is used for controlling the conduction and the cutoff of the fluid channel; A second valve cavity is arranged on the pressure limiting valve core or the integrated valve body, the second valve cavity is provided with an outer port communicated with the external atmosphere and an inner port directly or indirectly communicated with the fluid channel, the pressure limiting valve core is inserted into the second valve cavity and is used for controlling the conduction and cutoff of the fluid channel and the external atmosphere according to the pressure in the fluid channel. Further, a switch runner is arranged at the end part of the switch valve core inserted into the first valve cavity in a penetrating way, the switch valve core can rotate relative to the first valve cavity, the rotation axis of the switch valve core is perpendicular to the axes of the fluid channel and the switch runner, and the switch valve core enables the switch runner to be in a state of being conducted or cut off with the fluid channel in the rotation process. Further, the pressure limiting valve core comprises a pressure limiting valve core body, a ball body and a spring. In a first embodiment, the second valve cavity is arranged on the switch valve core, the outer port of the second valve cavity is communicated with the external atmosphere, and the inner port of the second valve cavity is communicated with the switch flow channel; The pressure limiting valve core body is provided with a pressure limiting flow passage in a penetrating way, the pressure limiting fl