CN-122014471-A - Start control valve, method for adjusting start control valve, and engine

CN122014471ACN 122014471 ACN122014471 ACN 122014471ACN-122014471-A

Abstract

The application discloses a starting control valve, a regulating method of the starting control valve and an engine, which belong to the technical field of engines, a rough adjusting component and a fine adjusting component are arranged in a containing cavity of a valve body, the rough adjusting component changes the equivalent bearing area of a valve core, the load generated by the valve core under the action of the starting air pressure is integrally regulated, so that the contact stress between the valve core and the cam is controlled under different air pressure conditions, the contact stress is kept within an allowable range, excessive abrasion of the cam or the valve core caused by overlarge contact stress is avoided, and the running reliability of the engine is improved. The fine adjustment component carries out fine adjustment on the stress of the valve core by adjusting the pre-tightening parameters, and the contact stress is further optimized while ensuring that the valve core can still overcome the acting force of the elastic piece to realize normal action under lower starting air pressure. By the arrangement, the starting control valve can adapt to different starting air pressure working conditions, so that the environmental adaptability is improved, and the maintenance and design cost is reduced.

Inventors

JIANG ZHENGHUI
ZHANG GUOYONG
ZHANG LUYAO
LI LITING
TANG YIHU
XU YUXUAN

Assignees

中国船舶集团有限公司第七一一研究所

Dates

Publication Date: 20260512
Application Date: 20260319

Claims (14)

1. A start control valve, characterized by comprising: a valve body having a receiving chamber; The valve core is positioned in the accommodating cavity; the coarse adjustment assembly is positioned in the accommodating cavity, is arranged on one side of the valve core away from the cam and is used for adjusting the contact stress of the valve core and the cam by controlling the equivalent bearing area of the valve core; and the fine adjustment assembly is positioned in the accommodating cavity, is matched with the coarse adjustment assembly and is used for adjusting the contact stress of the valve core and the cam by controlling the pre-tightening parameter.
2. The start-up control valve of claim 1, wherein the coarse adjustment assembly comprises a valve stem and a valve collar, the valve collar being disposed around the valve stem, the valve stem being coupled to the valve spool.
3. The start-up control valve of claim 2, wherein the coarse adjustment assembly is configured to adjust the equivalent bearing area of the spool by matching the outer diameters of the valve stem and the valve collar.
4. The start-up control valve of claim 2, wherein the coarse adjustment assembly further comprises a first seal disposed between and connected to the valve collar and the valve stem, respectively.
5. The start control valve according to claim 1, wherein the fine adjustment assembly includes an elastic member and an adjusting member, the adjusting member is adjustably sleeved on the valve core, the elastic member is sleeved on the valve core, one end of the elastic member abuts against the adjusting member along an axial direction of the valve core, the other end of the elastic member abuts against the valve body, and the adjusting member is used for adjusting a pre-tightening amount of the elastic member.
6. The start-up control valve of claim 5, wherein the valve body comprises: the body part is provided with an inlet and an outlet, the inlet and the outlet are respectively communicated with the accommodating cavity, and the inlet and the outlet are arranged at intervals in the axial direction of the valve core; A step portion provided on an inner wall of the body portion, the step portion having a plurality of notched portions, each of the notched portions being provided opposite to the inlet and the outlet, respectively; the elastic piece is abutted with one side of the stepped part, which is close to the adjusting piece, and the valve core is used for moving relative to the stepped part along the axial direction of the valve core so as to control the communication or disconnection between the inlet and the outlet.
7. The start-up control valve of claim 2, wherein the valve body further comprises a body portion, a valve cover, and a bonnet, the valve collar being sandwiched between the valve cover and the bonnet, the valve cover being connected to the body portion and the bonnet, respectively.
8. The start-up control valve of claim 7, further comprising: The second sealing piece is arranged around the valve ring and is respectively connected with the valve cover and the valve cap; And the third sealing piece is arranged between the valve cover and the body part and is respectively connected with the valve cover and the body part.
9. A method of regulating a start control valve, comprising the steps of: Confirming a maximum contact stress at the maximum air pressure and a minimum concentrated load at the minimum air pressure based on the maximum air pressure and the minimum air pressure of the use environment of the starting control valve; Controlling the equivalent bearing area of the valve core based on the maximum contact stress, and adjusting the contact stress of the valve core and the cam; and adjusting the contact stress of the valve core and the cam based on the minimum concentrated load control pre-tightening parameter.
10. The method of adjusting a start-up control valve according to claim 9, wherein said confirming the maximum contact stress at the maximum air pressure comprises: determining the maximum concentrated load born by the valve core based on the maximum air pressure, the valve core outer diameter and the valve rod outer diameter; The maximum contact stress is determined based on the maximum concentrated load, a radius of curvature at which the cam contacts the spool, a material elasticity parameter, and a state constant.
11. The method of adjusting a start control valve according to claim 9, wherein said confirming a minimum concentrated load at said minimum air pressure comprises: and determining the minimum concentrated load based on the minimum air pressure, the valve core outer diameter, the valve rod outer diameter, the rigidity of the elastic piece, the pre-tightening amount and the valve core travel.
12. The method of adjusting a start control valve according to claim 9, wherein the controlling the equivalent bearing area of the spool based on the maximum contact stress, adjusting the contact stress of the spool with the cam, comprises: And when the maximum contact stress is larger than the allowable contact stress, changing the equivalent bearing area of the valve core by adjusting the outer diameter of the valve rod, and redefining the maximum contact stress until the maximum contact stress is smaller than or equal to the allowable contact stress.
13. The method of adjusting a start control valve according to claim 9, wherein the adjusting the contact stress of the spool with the cam based on the minimum concentrated load control pretension parameter includes: When the minimum concentrated load is less than zero, the pre-tightening amount of the elastic member is adjusted to change the elastic force acting on the spool, and the minimum concentrated load is redetermined until the minimum concentrated load is greater than or equal to zero.
14. An engine comprising the start control valve according to any one of claims 1 to 8.

Description

Start control valve, method for adjusting start control valve, and engine Technical Field The application relates to the technical field of engines, in particular to a starting control valve, a regulating method of the starting control valve and an engine. Background The air distributor starting mode is an important starting mode of the diesel engine, wherein a starting control valve is a critical component in the air distributor starting system, and the starting control valve is matched with a cam to distribute compressed air so as to control each cylinder to start in sequence. Whether it can operate properly has a significant impact on the starting performance of the diesel engine. The starting air compression as a peripheral parameter can be obviously changed along with the application scene and the starting performance requirement of the diesel engine, so that the functionality and the safety of the starting control valve under different use environments can be changed, the safety of the starting control valve is reduced, and the long-term reliable operation of the diesel engine cannot be ensured. Disclosure of Invention The embodiment of the application provides a starting control valve, an adjusting method of the starting control valve and an engine, which aim to at least partially solve the technical problem that the starting control valve is low in safety under different use environments. In order to achieve the above object, according to a first aspect of the present application, there is provided a start control valve comprising: a valve body having a receiving chamber; The valve core is positioned in the accommodating cavity; The coarse adjustment assembly is positioned in the accommodating cavity, is arranged on one side of the valve core away from the cam and is used for adjusting the contact stress of the valve core and the cam by controlling the equivalent bearing area of the valve core; the fine adjustment assembly is positioned in the accommodating cavity and matched with the coarse adjustment assembly, and is used for adjusting the contact stress of the valve core and the cam by controlling the pre-tightening parameter. In some embodiments, the coarse adjustment assembly includes a valve stem and a valve collar that is sleeved on the valve stem, the valve stem being connected to the valve core. In some embodiments, the coarse adjustment assembly is used to adjust the equivalent bearing area of the valve spool by matching the outer diameters of the valve stem and the valve collar. In some embodiments, the coarse adjustment assembly further includes a first seal disposed between and coupled to the valve collar and the valve stem, respectively. In some embodiments, the fine tuning assembly comprises an elastic member and an adjusting member, the adjusting member is adjustably sleeved on the valve core, the elastic member is sleeved on the valve core, one end of the elastic member is abutted with the adjusting member along the axial direction of the valve core, the other end of the elastic member is abutted with the valve body, and the adjusting member is used for adjusting the pre-tightening amount of the elastic member. In some embodiments, the valve body comprises: the body part is provided with an inlet and an outlet which are respectively communicated with the accommodating cavity, and the inlet and the outlet are arranged at intervals in the axial direction of the valve core; The elastic piece is abutted with one side of the stepped part, which is close to the adjusting piece, and the valve core is used for moving along the axial direction of the valve core relative to the stepped part so as to control the connection or disconnection between the inlet and the outlet. In some embodiments, the valve body further comprises a body portion, a bonnet, and a bonnet, the bonnet ring being sandwiched between the bonnet and the bonnet, the bonnet being connected to the body portion and the bonnet, respectively. In some embodiments, the start-up control valve further comprises: the second sealing piece is arranged around the valve ring and is respectively connected with the valve cover and the valve cap; And the third sealing piece is arranged between the valve cover and the body part and is respectively connected with the valve cover and the body part. According to a second aspect of the present application, there is provided a method of adjusting a start control valve, comprising the steps of: confirming the maximum contact stress under the maximum air pressure and the minimum concentrated load under the minimum air pressure based on the maximum air pressure and the minimum air pressure of the use environment of the starting control valve; controlling the equivalent bearing area of the valve core based on the maximum contact stress, and adjusting the contact stress of the valve core and the cam; And adjusting the contact stress of the valve core and the cam based on the pre-tightening parameter c