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CN-224228984-U - Gradient unloading valve of emulsion pump

CN224228984UCN 224228984 UCN224228984 UCN 224228984UCN-224228984-U

Abstract

The utility model relates to the technical field of unloading valves, in particular to a gradient unloading valve of an emulsion pump, which comprises an unloading valve body, wherein the unloading valve body comprises two main valve bodies, each main valve body is provided with a high-pressure liquid outlet, an unloading liquid return port and a pump liquid supply port, the pump liquid supply port is communicated with the high-pressure liquid outlet, the two high-pressure liquid outlets are communicated, the two unloading liquid return ports are communicated, each main valve body is provided with a pilot valve body, one side of the unloading valve body is provided with two electromagnetic valves, the two electromagnetic valves are connected with the two pilot valve bodies one by one, the set pressure of the two pilot valve bodies is different, when the system pressure of hydraulic oil rises to a first-stage set value, one electromagnetic valve is powered on, one group of main valve bodies is controlled to be opened to realize small-flow unloading, the pressure rise is restrained, and if the pressure continues to rise to a second-stage set value, the other electromagnetic valve is powered on, the other group of main valve bodies is controlled to be opened, so that the large-flow unloading is realized, the system pressure is rapidly reduced to a safe range, and the gradient unloading is realized.

Inventors

  • WANG BO
  • CHEN RENJIAN
  • Wu Binsen
  • ZHENG KAI
  • NI WEIQIANG

Assignees

  • 浙江中煤机械科技有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (7)

  1. 1. The utility model provides a gradient type unloading valve of emulsion pump, includes unloading valve body (1), its characterized in that, unloading valve body (1) includes two main valve body (2), every all be provided with high-pressure outlet (24), unloading back liquid mouth (25) and pump feed liquid mouth (26) on main valve body (2), pump feed liquid mouth (26) with high-pressure outlet (24) intercommunication, two high-pressure outlet (24) intercommunication sets up, two unloading back liquid mouth (25) intercommunication sets up, every all be provided with on main valve body (2) guide valve body (3), unloading valve body (1) one side is provided with two solenoid valves (4), two solenoid valves (4) are connected with two guide valve bodies (3) one by one, and the setting pressure of one guide valve body (3) is greater than the setting pressure of another guide valve body (3).
  2. 2. The gradient unloading valve for an emulsion pump according to claim 1, wherein a pilot spring cavity (33) is formed in the pilot valve body (3), a pilot spring (32) is arranged in the pilot spring cavity (33), a pilot front cavity (34) is communicated with one side of the pilot spring cavity (33), a pilot valve core (31) for blocking the joint of the pilot spring cavity (33) and the pilot front cavity (34) is connected with one end of the pilot spring (32), an adjusting screw is connected with the other end of the pilot spring (32), a damping hole (27) communicated with the pilot front cavity (34) is formed in the pilot valve body (3), an inlet port (41) and an outlet port (42) communicated with the electromagnetic valve (4) are formed in the pilot valve body (3), the inlet port (41) and the outlet port (42) are respectively communicated with the pilot front cavity (34) and the pilot spring cavity (33), a main valve cavity (21) is formed in the main valve body (2), the top of the main valve cavity (21) is communicated with the front cavity (34) through the damping hole (27), the top of the main valve cavity (21) is connected with the top of the main valve cavity (21) through the upper valve core (22), the bottom of the main valve cavity (21) is communicated with the pump liquid supply port (26), the side wall of the lower part of the main valve cavity (21) is communicated with the unloading liquid return port (25), the pump liquid supply port (26) is communicated with the pilot front cavity (34) through the main valve oil inlet channel (28), and the pilot spring cavity (33) is communicated with the unloading liquid return port (25) through the main valve oil return pipeline (29).
  3. 3. Gradient unloading valve for emulsion pumps according to claim 2, characterized in that a first sealing ring is arranged between the pilot valve body (3) and the main valve body (2) and sleeved outside the main valve oil inlet channel (28).
  4. 4. Gradient unloading valve for emulsion pumps according to claim 2, characterized in that a second sealing ring is arranged between the pilot valve body (3) and the main valve body (2) and sleeved outside the main valve oil return pipeline (29).
  5. 5. Gradient unloading valve for emulsion pumps according to claim 1, characterized in that the surface of the unloading valve body (1) is provided with a protective coating.
  6. 6. Gradient unloading valve for emulsion pumps according to claim 1, characterized in that two main valve bodies (2) are arranged symmetrically.
  7. 7. Gradient unloading valve for emulsion pumps according to claim 1, characterized in that the main valve body (2), the pilot valve body (3) and the solenoid valve (4) are detachably arranged on the unloading valve body (1).

Description

Gradient unloading valve of emulsion pump Technical Field The utility model relates to the technical field of unloading valves, in particular to a gradient unloading valve of an emulsion pump. Background At present, a traditional constant-pressure unloading valve is widely adopted for an emulsion pump station of a fully-mechanized mining face of a coal mine, the core of the unloading valve is a single-stage overflow unloading structure, after the system pressure reaches a set value, the unloading valve is fully opened at one time, high-pressure fluid is directly discharged back to a liquid tank, the unloading valve can realize a basic pressure maintaining function under a conventional working condition, but in a large-flow (such as 2000L/min) emulsion pump system, when the emulsion pump station is fully opened at one stage, the system pressure is instantaneously suddenly reduced, the violent vibration of a pipeline is easily caused, the pressure impact is violent, in addition, the instantaneous discharge under the large-flow working condition easily causes the abrupt change of liquid supply flow, and the flow fluctuation is violent. Disclosure of utility model Therefore, the utility model aims to provide a gradient unloading valve of an emulsion pump, which solves the problems of severe pressure impact and severe flow fluctuation under the working condition of large flow. According to the purpose, the utility model provides a gradient unloading valve of an emulsion pump, which comprises an unloading valve body, wherein the unloading valve body comprises two main valve bodies, each main valve body is provided with a high-pressure liquid outlet, an unloading liquid return port and a pump liquid supply port, the pump liquid supply ports are communicated with the high-pressure liquid outlet, the two high-pressure liquid outlets are communicated, the two unloading liquid return ports are communicated, each main valve body is provided with a pilot valve body, one side of the unloading valve body is provided with two electromagnetic valves, the two electromagnetic valves are connected with the two pilot valve bodies one by one, and the set pressure of one pilot valve body is larger than that of the other pilot valve body. When the system pressure of hydraulic oil rises to a first-stage set value, one electromagnetic valve is powered on, a group of main valve bodies are controlled to be opened, low-flow unloading is realized, pressure rising is restrained, and if the pressure continues to rise to a second-stage set value, the other electromagnetic valve is powered on, the other group of main valve bodies are controlled to be opened, high-flow unloading is realized, the system pressure is quickly reduced to a safe range, and gradient unloading is realized. The pilot valve is characterized in that a pilot spring cavity is formed in the pilot valve body, a pilot valve spring is arranged in the pilot spring cavity, one side of the pilot spring cavity is communicated with a pilot front cavity, one end of the pilot valve spring is connected with a pilot valve core for blocking the joint of the pilot spring cavity and the pilot front cavity, the other end of the pilot valve spring is connected with an adjusting screw, a damping hole communicated with the pilot front cavity is formed in the pilot valve body, an inlet and an outlet communicated with the electromagnetic valve are formed in the pilot valve body, the inlet and the outlet are respectively communicated with the pilot front cavity and the pilot spring cavity, a main valve cavity is formed in the main valve body, the top of the main valve cavity is communicated with the pilot front cavity through the damping hole, a main valve core is slidably arranged at the lower part of the main valve cavity, the main valve cavity is connected with the top of the main valve cavity in a propping mode through the main valve spring, the bottom of the main valve cavity is communicated with a pump liquid supply port, the side wall of the lower part of the main valve cavity is communicated with the pilot valve cavity through a main valve oil inlet channel, the main valve liquid supply port is communicated with the pilot front cavity through a main valve oil return channel, and the pilot spring cavity is communicated with the main oil return channel through an oil return channel. Optionally, a first sealing ring sleeved outside the main valve oil inlet channel is arranged between the pilot valve body and the main valve body. Optionally, a second sealing ring sleeved on the outer side of the main valve oil return pipeline is arranged between the pilot valve body and the main valve body. Optionally, the surface of the unloading valve body is provided with a protective coating. Optionally, the two main valve bodies are symmetrically arranged. Optionally, the main valve body, the pilot valve body and the electromagnetic valve are detachably arranged on the unloading valve body. The gradie