Air control valve intermittent lubrication structure, control valve and intermittent lubrication method

Abstract

The invention relates to the technical field of air control valve lubrication, in particular to an air control valve intermittent lubrication structure, a control valve and an intermittent lubrication method.The lubrication structure comprises a main valve body, a main piston rod is arranged in the main valve body, and a lower cover assembly matched with the main piston rod is arranged below the main valve body; a piston oil cavity is formed in the main piston rod and communicates with a piston pressure relief gas circuit structure for intermittent gas relief. A lower cover oil cavity is formed in the lower cover assembly and communicated with a lower cover pressure relief gas circuit structure for intermittent gas relief. Aiming at the situation that lubricating oil is used too fast in an existing lubricating structure, a lower cover pressure relief gas circuit structure and a piston pressure relief gas circuit structure which are used for intermittently releasing gas are additionally arranged on a lower cover assembly and a main piston rod. Continuous lubrication is improved into intermittent lubrication, the problem that lubricating oil in an oil cavity is lacked in the later period is solved, the service life of the lubricating oil can be prolonged, and waste of the lubricating oil when the sliding valve pair does not work can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air control valve lubrication, and in particular to an intermittent lubrication structure of an air control valve, a control valve and an intermittent lubrication method. Background Art

[0002] In railway freight, the braking system is one of the important components to ensure transportation safety. The air brake valve is the most important component of the braking system. Its reliability, stability and service life are closely related to transportation safety. The active lubrication 120 / 120-1 valve is an air brake valve. Since the active lubrication 120 / 120-1 valve was installed, the overall operation has been good. During the operation inspection after a section repair period, it was found that the lubricating oil in the main piston rod oil chamber and the main valve lower cover oil chamber was lacking (by counting the remaining lubricating oil of 300 sets of active lubrication 20 / 120-1 valves in a section repair period, 48.7% of the main piston rod oil chamber and 61.3% of the main valve lower cover oil chamber can be extracted with silicone oil, and the remaining oil chambers have less remaining lubricating oil and cannot be directly extracted with a syringe). In addition, the lubricating oil is used quickly in the early stage and lacks in the later stage. There is a lot of lubricating oil waste in the early stage, and it is discharged from the exhaust port of the active lubrication 120 / 120-1 valve when it is relieved.

[0003] Analysis of the main piston rod lubrication principle: During the test or application of the active lubrication 120 / 120-1 valve, when the train pipe fills the auxiliary air cylinder with air, the pressurized air enters the action part. Since the lubricating oil in the main piston rod oil chamber cannot fill the main piston rod oil chamber completely, the pressurized air in the action part enters the oil chamber through the one-way valve. Since the density of the pressurized air is less than the density of the lubricating oil, the pressurized air is stored in the upper part of the main piston rod oil chamber. During the train pipe decompression braking process, the pressure of the auxiliary air cylinder decreases with the train pipe pressure, while the pressurized air in the oil chamber is in a closed space without pressure changes, so that the main piston rod lubrication oil circuit forms a pressure difference, and the lubricating oil in the oil chamber is transmitted to the working surface of the control valve. Since the pressurized air in the oil chamber always exists, the pressure difference of the oil circuit exists for a long time during the brake pressure maintenance process or after parking. However, the mating surface of the control valve and the slide valve cannot achieve absolute sealing, so the lubricating oil will continue to be transmitted to the control valve surface until the circuit pressure difference reaches a new balance point after the lubricating oil is transmitted. As the number of braking increases, the pressure of air in the oil chamber will also increase. Each time the balance is reached, the amount of lubricating oil delivered by the oil circuit will also increase, resulting in an increasingly rapid trend in the use of lubricating oil. When there is leakage in the oil circuit, such as poor sealing of the control valve surface and damage to the oil pipe O-ring, the consumption of lubricating oil will be doubled. After testing and verifying the control valve with leakage of the oil pipe O-ring, after 3 full-process performance tests, the remaining lubricating oil in the main piston rod oil chamber is small and cannot be directly drawn out with a syringe.

[0004] Analysis of the lubrication principle of the main valve lower cover: The principle of using the lubricating oil of the main valve lower cover is basically the same as that of the main piston rod lubricating oil. Both use the pressure difference to transmit the lubricating oil to the auxiliary working surface of the sliding valve, but there are two differences. First, the lubricating oil of the main piston rod is transmitted from top to bottom, while the lubricating oil of the main valve lower cover is transmitted from bottom to top; second, the air inlet of the main piston rod oil chamber is at the bottom of the oil chamber, while the air inlet of the main valve lower cover oil chamber is at the top of the oil chamber. Therefore, it is not easy to completely seal the pressurized air entering the oil chamber of the main valve lower cover, and the one-way valve at the air inlet is a possible leakage point. The leakage here helps to slow down the transmission of the lubricating oil, but if the leakage is too large, the lubricating oil cannot be transmitted to the sliding valve surface.

[0005] Combined with the analysis of the lubrication principle of the main piston rod and the lower cover of the main valve, the reason for the lack of lubricating oil after a maintenance period is: the oil chamber is a closed volume, and the pressurized air has no pressure relief air path after entering the air path, resulting in the entered pressurized air being stored in the oil chamber all the time, which continuously squeezes the lubricating oil and achieves the effect of continuous lubrication. There is a certain amount of lubricating oil waste, which leads to a lack of lubricating oil in the later period.

[0006] Therefore, it is necessary to propose a more reasonable technical solution to solve the technical problems existing in the prior art. Summary of the invention

[0007] In order to overcome at least one of the defects mentioned above, the present invention proposes an intermittent lubrication structure, a control valve and an intermittent lubrication method for an air control valve. By improving the main piston rod of the valve body and the cover structure below, intermittent lubrication inside the control valve is achieved in cooperation with the air circuit of the control valve. This can provide effective lubrication for the key moving parts of the brake valve and maintain a normal moving state, and can also extend the service life of the lubricating oil, thereby improving the performance of the brake valve and extending the maintenance cycle.

[0008] In order to achieve the above-mentioned purpose, the intermittent lubrication structure of the air control valve disclosed in the present invention can adopt the following technical solutions:

[0009] An intermittent lubrication structure of an air control valve comprises a main valve body, a main piston rod is arranged in the main valve body, and a lower cover assembly cooperating with the main piston rod is arranged below the main valve body; a piston oil chamber is arranged in the main piston rod, and the piston oil chamber is connected to a piston pressure relief air path structure for intermittent air release; a lower cover oil chamber is arranged in the lower cover assembly, and the lower cover oil chamber is connected to a lower cover pressure relief air path structure for intermittent air release; when the piston pressure relief air path structure and the lower cover pressure relief air path structure are pressurized, the piston oil chamber and the lower cover oil chamber transport lubricating oil to the part to be lubricated; when the piston pressure relief air path structure and the lower cover pressure relief air path structure maintain pressure, the piston oil chamber and the lower cover oil chamber stop transporting lubricating oil; when the piston pressure relief air path structure and the lower cover pressure relief air path structure relieve pressure, the gas in the piston pressure relief air path structure is released to the outside, and the gas in the lower cover pressure relief air path structure flows back in reverse.

[0010] Specifically, in view of the fact that the lubrication structure of the existing active lubrication 120 / 120-1 valve uses lubricating oil too quickly, a lower cover pressure relief air path structure and a piston pressure relief air path structure with intermittent air release are added to the lower cover assembly and the main piston rod.

[0011] Improve continuous lubrication to intermittent lubrication to solve the problem of lack of lubricating oil in the oil chamber in the later stage. The main feature of the present invention is intermittent lubrication. When the control valve is braked, the lubricating oil in the oil chamber will be transmitted by pressurized air to the working surface of the sliding valve pair for lubrication. When the pressure is maintained, the lubricating oil circuit will stop transmitting. In the existing lubrication structure, pressurized air enters the oil chamber through a one-way valve, and there is no gas outlet. The lubricating oil will be squeezed during the braking and pressure-maintaining processes, causing the lubricating oil to be used too quickly. After adopting the solution of the present invention, the use time of the lubricating oil can be extended, and at the same time, the waste of lubricating oil caused by the sliding valve pair when it is not working can be avoided.

[0012] Furthermore, the setting and connection of the oil chamber can adopt a variety of schemes, and its structure is not limited to a single one. Here, an optimization is made and one of the feasible options is proposed: a piston oil filling port connected to the piston oil chamber is arranged on the side wall of the main piston rod, the piston oil chamber extends along the axial direction of the main piston rod, a piston oil outlet connected to the inner cavity of the main valve body is arranged at the bottom of the piston oil chamber, and the top of the piston oil chamber is connected to a balanced counterflow hole for gas to enter and exit; a lower cover air inlet and a lower cover oil filling port connected to the lower cover oil chamber are arranged on the lower cover assembly, and the lower cover oil chamber is provided with a lower cover oil outlet connected to the inner cavity of the main valve body. When the above scheme is adopted, lubricating oil is injected into the piston oil chamber through the piston oil filling port, and lubricating oil is injected into the lower cover oil chamber through the lower cover oil filling port; air pressure regulation in the piston oil chamber is achieved through the balanced counterflow hole, and air pressure regulation in the lower cover oil chamber is achieved through the lower cover air inlet.

[0013] Furthermore, for the intermittent lubrication structure, one of the feasible options is proposed here: it also includes a lubrication pipeline system, the lubrication pipeline system includes a lubrication oil circuit, the oil circuit inlet of the lubrication oil circuit is connected with the piston oil outlet and the lower cover oil outlet at the same time; the oil circuit outlet of the lubrication oil circuit is connected with the working surface of the sliding valve pair. When the above scheme is adopted, the air brake valve mainly relies on the change of pressure air to brake, release and maintain pressure. An oil chamber is designed in the lower cover assembly of the air brake valve and the main piston rod, respectively, to provide lubricating oil for the friction pair between the sliding valve sleeve and the large surface of the sliding valve and the friction pair between the small surface of the sliding valve and the control valve, and compressed air is used as the power source for oil supply. The oil chamber is provided with an air inlet, an oil inlet and an oil outlet. The oil outlet is connected with the sliding valve pair through the lubrication oil circuit and the oil circuit outlet to achieve lubrication of the sliding valve pair.

[0014] Furthermore, in order to realize intermittent oil supply of the lower cover, the pressure relief air path structure of the lower cover can adopt multiple schemes, and its structure is not limited to a single one. Here, it is optimized and one of the feasible options is proposed: the pressure relief air path structure of the lower cover includes a sealing gasket and a throttle hole screw plug arranged in the air inlet of the lower cover. When this scheme is adopted, in order to solve the problem of too fast oil discharge of the lower cover assembly, the original air inlet check valve of the lower cover assembly of the main valve is cancelled, and the check valve screw plug is improved to a throttle hole screw plug. Through structural improvement, the long-term existence of air in the oil chamber of the lower cover can be effectively eliminated. When the train pipe is decompressed, the auxiliary air cylinder follows the decompression, and the air pressure in the oil chamber of the lower cover is instantaneously higher than the air pressure of the action part, and the lubricating oil in the oil chamber of the lower cover is transmitted to the sliding valve surface. As time increases, the pressure air in the oil chamber of the lower cover is discharged to the action part through the throttle hole screw plug, and the lubricating mechanism stops working. Intermittent lubrication replaces the continuous lubrication of the original mechanism to achieve the effect of slow oil discharge and avoid excessive lubricating oil squeezed out of the oil chamber of the lower cover, causing waste.

[0015] Furthermore, the lower cover pressure relief air circuit structure can adopt another scheme: the lower cover pressure relief air circuit structure includes a lower cover pressure relief channel arranged on the lower cover assembly and connected to the lower cover oil chamber, and a sealing gasket and a throttle hole screw plug are arranged in the lower cover pressure relief channel. When the above scheme is adopted, for the lower cover pressure relief air circuit assembly, when the train is inflated and relieved, the pressure air of the auxiliary air cylinder enters the lower cover oil chamber through the air inlet. At this time, there is no pressure difference between the lower cover air inlet and the oil circuit outlet, and the oil will not flow with the oil circuit. When the train brakes, the pressure of the auxiliary air cylinder drops, and the pressure of the oil circuit outlet drops with the pressure of the auxiliary air cylinder. The lower cover air inlet (a throttle hole screw plug is arranged in the lower cover air inlet) can be regarded as a throttle hole. At this time, a pressure difference is generated between the lower cover air inlet and the oil circuit outlet, and the oil reaches the slide valve pair through the oil circuit for lubrication. When the train is in the process of maintaining pressure, the pressure air in the lower cover oil chamber will be discharged back to the auxiliary air cylinder through the lower cover air inlet, and the pressure of the oil circuit outlet will be balanced, thereby interrupting lubrication and achieving the effect of intermittent lubrication.

[0016] Furthermore, the setting structure of the balanced reverse flow hole can adopt multiple schemes, and one feasible option is proposed here: the balanced reverse flow hole is radially arranged on the side wall of the main piston rod. In order to eliminate the problem of long-term oil chamber pressure, a balanced reverse flow hole is added to the piston oil chamber of the main piston rod. After adding the balanced reverse flow hole, the pressure air in the piston oil chamber forms a state of inflow and outflow, and will not always exist in the oil chamber. At the same time, due to the small area and short stroke of the control valve, the required lubricating oil is limited. Therefore, the injection amount of the original lubricating oil can be reduced, for example, adjusted from 12ml to 6ml, saving the amount of silicone oil.

[0017] Furthermore, the structure in the piston oil filling port can adopt a variety of schemes, and its structure is not limited to a single one. Here, an optimization is performed and one of the feasible options is proposed: a sealing gasket and a solid one-way valve plug are provided in the piston oil filling port. When the above scheme is adopted, the slow oil discharge scheme of the main piston rod is optimized, and improvements are mainly made in two aspects, namely, eliminating the problem of long-term pressure in the oil chamber and avoiding leakage of the piston oil filling port. In order to avoid leakage of the piston oil filling port, the one-way valve plug structure of the existing piston oil filling port is improved. By eliminating the middle hole of the one-way valve plug, the middle hole of the one-way valve plug can be effectively prevented from flowing out the lubricating oil through the middle hole of the one-way valve plug under the action of the piston oil chamber pressure, thereby avoiding the excessive use and waste of the lubricating oil.

[0018] Furthermore, the piston oil outlet and the balanced reverse flow hole coordinate to supply lubricating oil in the piston oil chamber. The two can be set in a variety of ways, and their structure is not limited to the only one. Here, we optimize and propose one of the feasible options: the effective area of ​​the piston oil outlet is larger than the effective area of ​​the balanced reverse flow hole; the effective area of ​​the lower cover air inlet is smaller than the effective area of ​​the lower cover oil outlet. When the above solution is adopted, the air inlet and the oil circuit outlet are both within the pressure air coverage of the auxiliary air cylinder.

[0019] The above content discloses an intermittent lubrication structure of an air control valve. The present invention also discloses a control valve which adopts the intermittent lubrication structure.

[0020] A control valve adopts the intermittent lubrication structure mentioned above.

[0021] The present invention also discloses a method for intermittent lubrication:

[0022] An intermittent lubrication method for an air control valve adopts the control valve described above.

[0023] Furthermore, in the present method, when the control valve is braked, the lubricating oil in the piston oil chamber and the lower cover oil chamber is transmitted by pressurized air to the slide valve auxiliary working surface for lubrication; when the control valve maintains pressure, the lubricating oil circuit stops transmitting.

[0024] Compared with the prior art, some beneficial effects of the technical solution disclosed in the present invention include:

[0025] In view of the fact that the existing lubrication structure uses lubricating oil too quickly, the lower cover assembly and the main piston rod are added with an intermittent air release lower cover pressure relief gas path structure and a piston pressure relief gas path structure. The continuous lubrication is improved to intermittent lubrication, which solves the problem of lack of lubricating oil in the oil chamber in the later stage, can extend the use time of lubricating oil, and avoid the waste of lubricating oil when the slide valve pair is not working. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is the overall structure diagram of the control valve.

[0028] Figure 2 It is a schematic diagram of the cross-sectional structure of the control valve.

[0029] Figure 3 Schematic diagram of the overall structure inside the control valve.

[0030] Figure 4 This is a schematic diagram of the front view structure inside the control valve.

[0031] Figure 5 It is a schematic diagram of the cross-sectional structure inside the control valve.

[0032] Figure 6 It is a schematic diagram of the structure of the throttle hole screw plug.

[0033] Figure 7 It is a structural schematic diagram of a solid one-way valve screw plug.

[0034] In the above drawings, the meanings of the symbols are as follows:

[0035] 1. Main valve body; 2. Lower cover assembly; 201. Lower cover oil filling port; 202. Lower cover air inlet; 203. Lower cover oil chamber; 3. Main piston rod; 301. Piston oil chamber; 302. Piston oil outlet; 304. Piston oil filling port; 303. Balanced reverse flow hole; 4. Sliding valve pair; 5. Control valve friction pair; 6. Solid one-way valve screw plug; 7. Throttle hole screw plug. DETAILED DESCRIPTION

[0036] The present embodiment is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] like Figure 1 to Figure 7As shown, an intermittent lubrication structure of an air control valve comprises a main valve body 1, a main piston rod 3 is arranged in the main valve body 1, and a lower cover assembly 2 cooperating with the main piston rod 3 is arranged below the main valve body 1; a piston oil chamber 301 is arranged in the main piston rod 3, and the piston oil chamber 301 is connected to the piston pressure relief air path structure of intermittent air release; a lower cover oil chamber 203 is arranged in the lower cover assembly 2, and the lower cover oil chamber 203 is connected to the lower cover pressure relief air path structure of intermittent air release; when the piston pressure relief air path structure and the lower cover pressure relief air path structure are pressurized, the piston oil chamber 301 and the lower cover oil chamber 203 transport lubricating oil to the part to be lubricated; when the piston pressure relief air path structure and the lower cover pressure relief air path structure maintain pressure, the piston oil chamber 301 and the lower cover oil chamber 203 stop transporting lubricating oil; when the piston pressure relief air path structure and the lower cover pressure relief air path structure relieve pressure, the gas in the piston pressure relief air path structure is released to the outside, and the gas in the lower cover pressure relief air path structure flows back in reverse.

[0039] Specifically, in view of the fact that the lubrication structure of the existing active lubrication 120 / 120-1 valve uses lubricating oil too quickly, a lower cover pressure relief air path structure and a piston pressure relief air path structure with intermittent air release are added to the lower cover assembly 2 and the main piston rod 3.

[0040] Improve continuous lubrication to intermittent lubrication to solve the problem of lack of lubricating oil in the oil chamber in the later stage. The main feature of the present invention is intermittent lubrication. When the control valve is braked, the lubricating oil in the oil chamber will be transmitted by pressurized air to the working surface of the sliding valve pair 4 for lubrication. When the pressure is maintained, the lubricating oil circuit will stop transmitting. In the existing lubrication structure, pressurized air enters the oil chamber through a one-way valve, and there is no gas outlet. The lubricating oil will be squeezed during the braking and pressure-maintaining processes, causing the lubricating oil to be used too quickly. After adopting the solution of the present invention, the use time of the lubricating oil can be extended, and at the same time, the waste of lubricating oil caused by the sliding valve pair 4 when it is not working can be avoided.

[0041] There are many options for setting up and connecting the oil chamber, and its structure is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: a piston oil filling port 304 connected to the piston oil chamber 301 is provided on the side wall of the main piston rod 3, the piston oil chamber 301 extends along the axial direction of the main piston rod 3, and a piston oil outlet 302 connected to the inner cavity of the main valve body 1 is provided at the bottom of the piston oil chamber 301, and a balancing countercurrent hole 303 for gas inlet and outlet is connected to the top of the piston oil chamber 301; a lower cover air inlet 202 and a lower cover oil filling port 201 connected to the lower cover oil chamber 203 are provided on the lower cover assembly 2, and the lower cover oil chamber 203 is provided with a lower cover oil outlet connected to the inner cavity of the main valve body 1. When the above scheme is adopted, lubricating oil is injected into the piston oil chamber 301 through the piston oil filling port 304, and lubricating oil is injected into the lower cover oil chamber 203 through the lower cover oil filling port 201; the air pressure in the piston oil chamber 301 is regulated by the balancing counterflow hole 303, and the air pressure in the lower cover oil chamber 203 is regulated by the lower cover air inlet 202.

[0042] For the intermittent lubrication structure, this embodiment adopts one of the feasible options: it also includes a lubrication pipeline system, the lubrication pipeline system includes a lubrication oil circuit, the oil circuit inlet of the lubrication oil circuit is connected with the piston oil outlet 302 and the lower cover oil outlet at the same time; the oil circuit outlet of the lubrication oil circuit is connected with the working surface of the slide valve pair 4. When the above scheme is adopted, the air brake valve mainly relies on the change of pressure air to brake, release and maintain pressure. An oil chamber is designed in the lower cover assembly 2 of the air brake valve and the main piston rod 3 to provide lubricating oil for the friction pair between the slide valve sleeve and the large surface of the slide valve and the friction pair 5 between the small surface of the slide valve and the control valve, respectively. Compressed air is used as the power source for oil supply. The oil chamber is provided with an air inlet, an oil inlet and an oil outlet. The oil outlet is connected with the slide valve pair 4 through the lubrication oil circuit and the oil circuit outlet to achieve lubrication of the slide valve pair 4.

[0043] In order to realize the intermittent oil supply of the lower cover, the pressure relief gas path structure of the lower cover can adopt multiple schemes, and its structure is not limited to the only one. This embodiment is optimized and adopts one of the feasible options: the pressure relief gas path structure of the lower cover includes a sealing gasket and a throttle hole screw plug 7 arranged in the lower cover air inlet 202. When this scheme is adopted, in order to solve the problem of too fast oil discharge of the lower cover assembly 2, the original inlet hole check valve of the main valve lower cover assembly 2 is cancelled, and the check valve screw plug is improved to the throttle hole screw plug 7. Through the structural improvement, the long-term existence of air in the lower cover oil chamber 203 can be effectively eliminated. When the train pipe is depressurized, the auxiliary air cylinder follows the depressurization, and the air pressure in the lower cover oil chamber 203 is instantaneously higher than the air pressure of the action part, and the lubricating oil in the lower cover oil chamber 203 is transmitted to the sliding valve surface. As time increases, the pressure air in the lower cover oil chamber 203 is discharged to the action part through the throttle hole screw plug 7, and the lubrication mechanism stops working. Intermittent lubrication is used instead of the original mechanism's continuous lubrication to achieve a slow oil discharge effect, thereby avoiding excessive lubricating oil being squeezed out of the lower cover oil chamber 203 and causing waste.

[0044] The lower cover pressure relief air circuit structure can adopt another scheme: the lower cover pressure relief air circuit structure includes a lower cover pressure relief channel arranged on the lower cover assembly 2 and connected to the lower cover oil chamber 203, and a sealing gasket and a throttle hole screw plug 7 are arranged in the lower cover pressure relief channel. When the above scheme is adopted, for the lower cover pressure relief air circuit assembly, when the train is inflated and relieved, the pressurized air of the auxiliary air cylinder enters the lower cover oil chamber 203 through the air inlet. At this time, there is no pressure difference between the lower cover air inlet 202 and the oil circuit outlet, and the oil will not flow with the oil circuit. When the train brakes, the pressure of the auxiliary air cylinder drops, and the pressure of the oil circuit outlet drops with the pressure of the auxiliary air cylinder. The lower cover air inlet 202 (the lower cover air inlet 202 is provided with a throttle hole screw plug 7) can be regarded as a throttle hole. At this time, a pressure difference is generated between the lower cover air inlet 202 and the oil circuit outlet, and the oil reaches the slide valve pair 4 through the oil circuit for lubrication. When the train is in the process of maintaining pressure, the pressurized air in the lower cover oil chamber 203 will be discharged back to the auxiliary air cylinder through the lower cover air inlet 202, and will reach equilibrium with the oil circuit outlet pressure, thereby interrupting lubrication and achieving the effect of intermittent lubrication.

[0045] The arrangement structure of the balanced reverse flow hole 303 can adopt a variety of schemes. This embodiment adopts one of the feasible options: the balanced reverse flow hole 303 is radially arranged on the side wall of the main piston rod 3. In order to eliminate the problem of long-term oil chamber pressure, a balanced reverse flow hole 303 is added to the piston oil chamber 301 of the main piston rod 3. After adding the balanced reverse flow hole 303, the pressure air in the piston oil chamber 301 forms a state of inflow and outflow, and will not always exist in the oil chamber. At the same time, due to the small area and short stroke of the control valve, the required lubricating oil is limited. Therefore, the injection amount of the original lubricating oil can be reduced, for example, adjusted from 12ml to 6ml, saving the amount of silicone oil.

[0046] The structure in the piston oil filling port 304 can adopt a variety of schemes, and its structure is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: a sealing gasket and a solid one-way valve screw plug 6 are provided in the piston oil filling port 304. When the above scheme is adopted, the slow oil discharge scheme of the main piston rod 3 is optimized, and the improvement is mainly made in two places, namely, eliminating the problem of long-term pressure in the oil chamber and avoiding the leakage of the piston oil filling port 304. In order to avoid leakage of the piston oil filling port 304, the one-way valve screw plug structure of the existing piston oil filling port 304 is improved. By eliminating the middle hole of the one-way valve screw plug, the middle hole of the one-way valve screw plug can be effectively prevented from flowing out the lubricating oil through the middle hole of the one-way valve screw plug under the pressure of the piston oil chamber 301, thereby avoiding the use of the lubricating oil too quickly and wasting it.

[0047] The piston oil outlet 302 and the balanced reverse flow hole 303 coordinate to supply the lubricating oil in the piston oil chamber 301. The two can be set in a variety of ways, and their structure is not limited to the only one. This embodiment is optimized and adopts one of the feasible options: the effective area of ​​the piston oil outlet 302 is larger than the effective area of ​​the balanced reverse flow hole 303; the effective area of ​​the lower cover air inlet 202 is smaller than the effective area of ​​the lower cover oil outlet. When the above solution is adopted, the air inlet and the oil outlet are both within the pressure air coverage of the auxiliary air cylinder.

[0048] Example 2

[0049] The content of the above-mentioned embodiment 1 discloses an intermittent lubrication structure of an air control valve. This embodiment discloses a control valve which adopts the above-mentioned intermittent lubrication structure.

[0050] like Figure 1 to Figure 7 As shown, a control valve adopts the intermittent lubrication structure mentioned above.

[0051] Example 3

[0052] This embodiment also discloses a method of intermittent lubrication:

[0053] like Figure 1 to Figure 7 As shown, a method for intermittent lubrication of an air control valve adopts the control valve described in Example 2.

[0054] Preferably, in this embodiment, when the control valve is braked, the lubricating oil in the piston oil chamber 301 and the lower cover oil chamber 203 is transmitted by pressurized air to the working surface of the sliding valve pair 4 for lubrication; when the control valve maintains pressure, the lubricating oil circuit stops transmitting.

[0055] Some case verification data are listed below to confirm the effect of actual operation according to the above embodiment.

[0056] 1. Scheme verification test:

[0057] In order to verify the oil discharge rate of the new solution, two sets of railway freight car air control valves of this application and four sets of existing active lubrication valves were selected for durability comparison test. According to the requirement of Q / CR 877 "Railway freight car 120 series air control valve" that the main valve durability test is not less than 40,000 times, 54,000 durability tests were carried out respectively to check the remaining amount of lubricating oil in the main piston rod and the oil chamber under the main valve cover. The test results are shown in Table 1 below.

[0058] Table 1 Lubricating oil residue after 54,000 endurance tests of new and existing solutions

[0059]

[0060] The test results show that the main valve lower cover and main piston rod oil chamber lubrication mechanism of the active lubrication valve optimized by this application can achieve the effect of slow oil discharge and meet the normal demand for lubricating oil of the sliding valve pair during the two-stage repair period.

[0061] 2. Static storage verification test

[0062] In order to verify whether the railway freight car air control valve of the present application will have lubricating oil outflow and waste during storage and transportation, the railway freight car air control valve of the present application was trial-produced and the lubricating oil was added to the oil chamber according to the assembly process, 30ml was added to the main valve lower cover, and 11ml was added to the main piston rod. When stored, it was placed in the most likely leakage position, the main piston rod was placed with the oil filling port facing downward, and the main valve lower cover was placed with the air inlet facing downward. After 20 days of storage, the remaining amount of lubricating oil was measured, and 29ml remained in the main valve lower cover, and 10ml remained in the main piston rod.

[0063] The test results show that the lubricating oil in the oil chamber will not be lost due to transportation or storage, thus affecting the lubrication effect.

[0064] 3. Lubrication effect verification test:

[0065] The lubrication effect verification mainly verifies whether the lubricating oil in the oil chamber under the main valve cover of the railway freight car air control valve of this application can be transferred to the valve face during the decompression process. During the test, the oil chamber under the main valve cover and the main piston rod oil chamber are normally refueled, and the slide valve is covered with 5 drops of lubricating oil, and is installed in the slide valve sleeve and moved back and forth 3 times to make the lubricating oil evenly distributed on the slide valve auxiliary working surface to prevent the valve face from being scratched. A 2000-time endurance test is carried out to check the lubricating oil status of the valve face. The results are shown in the figure. Figure 6 The valve face condition shows that the valve face has sufficient oil film and is in good condition.

[0066] The test results show that the diameter of the throttle hole on the throttle hole plug of the main valve lower cover is designed to be 0.3mm, which can meet the needs of transmitting lubricating oil to the valve surface.

[0067] In summary, the railway freight car air control valve of the present application optimizes the lubrication mode from continuous lubrication to intermittent lubrication, solves the problem of too fast oil discharge from the oil chamber, and verifies through experiments that the scheme has good feasibility, obvious lubrication effect, can meet the use requirements of two maintenance periods, and has no adverse effects on transportation and storage.

[0068] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods under the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the protection scope of this embodiment. The protection scope of this embodiment should be based on the definition in the claims.

Claims

1. An intermittent lubrication structure of an air control valve, comprising a main valve body (1), a main piston rod (3) is arranged inside the main valve body (1), and a lower cover assembly (2) cooperating with the main piston rod (3) is arranged below the main valve body (1); characterized in that: The main piston rod (3) is provided with a piston oil chamber (301), and the piston oil chamber (301) is connected to a piston pressure relief air circuit structure with intermittent air release; the lower cover assembly (2) is provided with a lower cover oil chamber (203), and the lower cover oil chamber (203) is connected to a lower cover pressure relief air circuit structure with intermittent air release; when the piston pressure relief air circuit structure and the lower cover pressure relief air circuit structure are pressurized, the piston oil chamber (301) and the lower cover oil chamber (203) transport lubricating oil to the part to be lubricated; when the piston pressure relief air circuit structure and the lower cover pressure relief air circuit structure are pressurized, the piston oil chamber (301) and the lower cover oil chamber (203) stop transporting lubricating oil; when the piston pressure relief air circuit structure and the lower cover pressure relief air circuit structure are depressurized, the gas in the piston pressure relief air circuit structure is released to the outside, and the gas in the lower cover pressure relief air circuit structure flows back in reverse.

2. The intermittent lubrication structure of the air control valve according to claim 1, characterized in that: A piston oil filling port (304) connected to the piston oil chamber (301) is arranged on the side wall of the main piston rod (3); the piston oil chamber (301) extends along the axial direction of the main piston rod (3); a piston oil outlet (302) connected to the inner cavity of the main valve body (1) is arranged at the bottom of the piston oil chamber (301); and a balancing counterflow hole (303) for gas inlet and outlet is connected to the top of the piston oil chamber (301); a lower cover air inlet (202) and a lower cover oil filling port (201) connected to the lower cover oil chamber (203) are arranged on the lower cover assembly (2); and the lower cover oil chamber (203) is provided with a lower cover oil outlet connected to the inner cavity of the main valve body (1).

3. The intermittent lubrication structure of the air control valve according to claim 2, characterized in that: The lower cover pressure relief gas path structure comprises a sealing gasket and a throttle hole screw plug (7) arranged in the lower cover air inlet (202); Alternatively, the lower cover pressure relief gas path structure comprises a lower cover pressure relief channel arranged on the lower cover assembly (2) and connected to the lower cover oil chamber (203), and a sealing gasket and a throttle hole screw plug (7) are arranged in the lower cover pressure relief channel.

4. The intermittent lubrication structure of the air control valve according to claim 2, characterized in that: The balancing backflow hole (303) is radially arranged on the side wall of the main piston rod (3).

5. The intermittent lubrication structure of the air control valve according to claim 2, characterized in that: A sealing gasket and a solid one-way valve screw plug (6) are arranged in the piston oil filling port (304).

6. The intermittent lubrication structure of the air control valve according to claim 3, characterized in that: The effective area of ​​the piston oil outlet (302) is larger than the effective area of ​​the balanced counterflow hole (303); and the effective area of ​​the lower cover air inlet (202) is smaller than the effective area of ​​the lower cover oil outlet.

7. The intermittent lubrication structure of the air control valve according to claim 2, characterized in that: It also includes a lubrication pipeline system, which includes a lubrication oil circuit, the oil circuit inlet of the lubrication oil circuit is connected to the piston oil outlet (302) and the lower cover oil outlet at the same time; the oil circuit outlet of the lubrication oil circuit is connected to the working surface of the slide valve pair (4).

8. A control valve, characterized in that: The intermittent lubrication structure according to any one of claims 1 to 7 is adopted.

9. An intermittent lubrication method for an air control valve, characterized in that: The control valve described in claim 8 is used.

10. The intermittent lubrication method for an air control valve according to claim 9, characterized in that: When the control valve is braked, the lubricating oil in the piston oil chamber (301) and the lower cover oil chamber (203) is transported by pressurized air to the working surface of the slide valve pair (4) for lubrication; when the control valve maintains pressure, the lubricating oil circuit stops transporting the oil.

Images