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CN-121993609-A - Indicator valve

CN121993609ACN 121993609 ACN121993609 ACN 121993609ACN-121993609-A

Abstract

The invention belongs to the technical field of engines, and particularly relates to an indicator valve. The indicator valve comprises a valve body, a valve assembly, a screw plug, a valve seat and a valve core, wherein the valve assembly is inserted in the inclined hole, the screw plug is in sealing connection with the large-diameter hole of the inclined hole, the valve assembly comprises a valve seat and a valve core which are sleeved together, the valve seat is fixed in the small-diameter hole of the inclined hole, the valve seat is provided with an axial through hole and an air outlet hole, a conical valve seat sealing surface is arranged at a hole end of a first end of the valve seat, a hole body part of a second end of the valve seat is provided with a valve seat threaded hole, the valve core comprises a coiled head which is arranged corresponding to the first end of the valve seat, a valve rod which is fixed on the coiled head and penetrates through the axial through hole, a conical valve core sealing surface which is matched with the conical valve seat sealing surface is arranged on one side of the coiled head, and a rod body part of the valve rod body part, which is far away from one side of the coiled head, is provided with a threaded rod section which is matched with the valve seat threaded hole. The indicator valve solves the problem of air leakage caused by poor contact due to poor coaxiality between the sealing surface of the valve core and the sealing surface inside the valve body of the existing indicator valve.

Inventors

  • ZHENG XIAOHUA
  • WANG CHUNYAN

Assignees

  • 重庆潍柴发动机有限公司
  • 潍柴重机股份有限公司

Dates

Publication Date
20260508
Application Date
20260211

Claims (10)

  1. 1. The indicator valve comprises a valve body (10), wherein the valve body (10) is provided with a gas channel and an inclined hole (11) penetrating the valve body (10), the inclined hole (11) divides the gas channel into a gas inlet channel (12) and a gas outlet channel (13), and is characterized in that the inclined hole (11) comprises a large-diameter hole arranged corresponding to one side of the gas inlet channel (12) and a small-diameter hole arranged corresponding to one side of the gas outlet channel (13), a positioning platform (14) is formed between the large-diameter hole and the small-diameter hole, the positioning platform (14) is intersected with the gas channel, the large-diameter hole is provided with a large-diameter threaded hole, the indicator valve further comprises a valve assembly inserted into the inclined hole (11) and a screw plug (60) connected with the large-diameter threaded hole in a sealing mode, and the valve assembly comprises a valve seat (20) and a valve core (40) which are sleeved together; The valve seat (20) is provided with an axial through hole and an air outlet hole (22) for connecting the axial through hole with the air outlet channel (13), a conical valve seat sealing surface (24) is arranged at the hole end of the first end of the valve seat (20), and a valve seat threaded hole (25) is arranged at the hole body part of the second end of the valve seat (20), the valve seat (20) is fixed on the small-diameter hole, a valve seat axial positioning structure is arranged between the valve seat (20) and the positioning platform (14), and a valve seat radial positioning structure is arranged between the valve seat (20) and the small-diameter hole; The valve core (40) comprises a disc head (41) arranged at the first end of the valve seat (20), and a valve rod which is fixed on the disc head (41) and penetrates through the axial through hole, one side, close to the valve rod, of the disc head (41) is provided with a conical valve core sealing surface (411) which is matched with the conical valve seat sealing surface (24), the rod body part, far away from one side of the disc head (41), of the valve rod is provided with a threaded rod section (42) which is matched with the valve seat threaded hole (25), and a valve core radial positioning structure is formed between the valve rod and the axial through hole.
  2. 2. The indicator valve according to claim 1, wherein the small-diameter hole is provided with a smooth positioning hole section (15), the valve seat (20) comprises a pipe body, the pipe hole of the pipe body is the axial through hole, the pipe body is provided with a positioning circular pipe section (23) matched with the smooth positioning hole section (15), a radial positioning structure of the valve seat is formed between the positioning circular pipe section (23) and the smooth positioning hole section (15), the indicator valve further comprises a convex ring (21) arranged at the first end of the pipe body, and the axial positioning structure of the valve seat is formed between the convex ring (21) and the positioning platform (14).
  3. 3. Indicator valve according to claim 2, wherein the smooth locating hole section (15) is arranged adjacent to the large diameter hole, the small diameter hole further comprises a small diameter threaded hole section (16) connected to the side, away from the large diameter hole, of the smooth locating hole section (15), the inner diameter of the smooth locating hole section (15) is larger than the inner diameter of the small diameter threaded hole section (16), the pipe body portion, close to the convex ring (21), of the pipe body is arranged to be a locating circular pipe section (23), and the pipe body portion, close to the second end of the pipe body, of the pipe body is arranged to be an external threaded pipe section (26) matched with the small diameter threaded hole section (16).
  4. 4. A indicator valve according to claim 3, wherein the second end of the tube body is provided with a valve seat bayonet (27) at the outside, the diameter of the outer circumference of the valve seat bayonet (27) is smaller than or equal to the outer diameter of the externally threaded tube section (26), and a locknut (30) is arranged at the externally threaded tube section (26) penetrating out of the small-diameter hole.
  5. 5. A indicator valve according to claim 3, wherein an annular groove (28) is provided at the outer peripheral side of the tube body corresponding to the air outlet channel (13), and at least two air outlet holes (22) are provided at intervals along the circumferential direction at the bottom surface of the annular groove (28).
  6. 6. Indicator valve according to claim 5, characterized in that the annular groove (28) is provided on the outer circumferential side of the positioning circular tube section (23).
  7. 7. Indicator valve according to claim 2, characterized in that a valve core bayonet (45) is connected to an end of the valve rod remote from the disc head (41), the diameter of the outer circumference of the valve core bayonet (45) is smaller than or equal to the outer diameter of the threaded rod section (42), and a lock nut (50) is arranged at the threaded rod part of the threaded rod section (42) penetrating out of the valve seat threaded hole (25).
  8. 8. Indicator valve according to any of claims 2 to 7, characterized in that a section of the shank between the threaded shank section (42) and the pan head (41) is provided as a positioning cylindrical section (43) adapted to the bore of the tube, the outer diameter of the positioning cylindrical section (43) being larger than the outer diameter of the threaded shank section (42), the spool radial positioning structure being formed between the positioning cylindrical section (43) and the bore of the tube.
  9. 9. Indicator valve according to claim 8, characterized in that the positioning cylinder section (43) is arranged at a distance from the pan head (41), the portion of the rod body between the pan head (41) and the positioning cylinder section (43) being provided as a connecting shaft section (44), the outer diameter of the connecting shaft section (44) being smaller than the outer diameter of the positioning cylinder section (43).
  10. 10. Indicator valve according to claim 9, wherein the bore portion of the tube body adjacent to the valve seat threaded bore (25) is provided as a locating bore section adapted to the locating cylindrical section (43), the bore portion between the first end of the tube body and the locating bore section having an inner diameter greater than the inner diameter of the locating bore section.

Description

Indicator valve Technical Field The invention belongs to the technical field of engines, and particularly relates to an indicator valve. Background The indicator valve is a valve applied to a diesel engine, and is arranged corresponding to each cylinder respectively and used for installing an indicator gauge to measure the burst pressure in the cylinder and used for knowing the working condition of the cylinder. The structure of the existing indicator valve is shown in Chinese patent publication No. CN208793742U, and comprises a valve body and a valve core, wherein a gas channel is arranged in the valve body, an inclined hole penetrating the valve body is arranged on the valve body, the inclined hole divides the gas channel into an air outlet channel at the upper part and an air inlet channel at the lower part, the valve core is inserted into the inclined hole of the valve body and is in threaded connection with an internal thread at the upper end of the inclined hole, a lower sealing surface in a conical surface shape is arranged at the lower part of the valve core, and an upper sealing surface in a conical surface shape is correspondingly arranged in the valve body. When the measuring is not needed, the valve core moves upwards to enable the lower sealing surface of the valve core to be tightly attached to the upper sealing surface in the valve body to form a seal, the indicator valve is in a closed state, when the measuring is needed, the valve core moves downwards to enable the lower sealing surface to be separated from the upper sealing surface, the inclined hole is opened to enable the air inlet channel to be communicated with the air outlet channel, and the indicator valve is in an open state. Because the movement of the valve core is realized through threaded connection, the coaxiality between the lower sealing surface and the upper sealing surface is difficult to ensure, and when the indicator valve is closed, air leakage is easily caused by poor contact between the lower sealing surface of the valve core and the upper sealing surface in the inclined hole, so that the normal operation of the diesel engine is seriously influenced. Disclosure of Invention The invention aims to solve the technical problem of providing an indicator valve, and aims to solve the problem of air leakage caused by poor contact due to poor coaxiality between a sealing surface of a valve core of the existing indicator valve and a sealing surface in a valve body. The invention discloses an indicator valve, which comprises a valve body, wherein the valve body is provided with a gas channel and an inclined hole penetrating through the valve body, and the inclined hole divides the gas channel into a gas inlet channel and a gas outlet channel; the inclined hole comprises a large-diameter hole arranged corresponding to one side of the air inlet channel and a small-diameter hole arranged corresponding to one side of the air outlet channel, a positioning platform is formed between the large-diameter hole and the small-diameter hole, the positioning platform is intersected with the air channel, the large-diameter hole is provided with a large-diameter threaded hole, and the small-diameter hole is provided with a smooth positioning hole section; The valve seat is fixed in the small-diameter hole, a valve seat axial positioning structure is arranged between the valve seat and the positioning platform, and a valve seat radial positioning structure is arranged between the valve seat and the small-diameter hole; the valve core comprises a coiled head arranged at the first end of the valve seat, and a valve rod fixed on the coiled head and penetrating through the axial through hole, wherein a conical valve core sealing surface matched with the conical valve seat sealing surface is arranged on one side of the coiled head, which is close to the valve rod, a rod body part of the valve rod, which is far away from one side of the coiled head, is arranged into a threaded rod section matched with the valve seat threaded hole, and a valve core radial positioning structure is formed between the valve rod and the axial through hole. The valve seat comprises a pipe body, wherein a pipe hole of the pipe body is the axial through hole, the pipe body is provided with a positioning circular pipe section matched with the smooth positioning hole section, a radial positioning structure of the valve seat is formed between the positioning circular pipe section and the smooth positioning hole section, the valve seat further comprises a convex ring arranged at the first end of the pipe body, and the axial positioning structure of the valve seat is formed between the convex ring and the positioning platform. As an improvement, the smooth positioning hole Duan Linjie is arranged in the large-diameter hole, the small-diameter hole further comprises a small-diameter threaded hole section connected to one side of the large-diameter hole of the smooth positioning hole