Oil mist lubrication device for regulating valve

Abstract

The present invention provides a regulating valve oil mist lubrication device, which belongs to the technical field of oil mist lubrication, and includes an air supply pipe, a diameter reducing mechanism, a suction pipe and a flow meter. One end of the air supply pipe is connected to an air pump, and the other end is connected to a pneumatic regulating valve; a plurality of variable diameter pipes are arranged on the air supply pipe; the diameter reducing mechanism is arranged on the variable diameter pipe, and is used to change the inner diameter of the variable diameter pipe; there are a plurality of suction pipes, one end of which is connected to the side wall of the variable diameter pipe, and the other end is connected to an oil tank for loading lubricating oil, and is used to transport lubricating oil into the air supply pipe; the flow meter is arranged on the suction pipe, and is used to measure the flow rate of lubricating oil in the suction pipe. The regulating valve oil mist lubrication device provided by the present invention, when the pressure difference between the air supply pipe and the variable diameter pipe is greater than the force required to suck the lubricating oil in the oil tank into the variable diameter pipe through the suction pipe, the lubricating oil is sucked into the variable diameter pipe to form oil mist, which plays a lubricating role on the components in the pneumatic regulating valve, and prevents the components in the pneumatic regulating valve from getting stuck.

Description

Technical Field

[0001] The invention belongs to the technical field of oil mist lubrication, and more specifically, relates to an oil mist lubrication device for a regulating valve. Background Art

[0002] The regulating valve, also known as the control valve, is the final control element in the field of industrial automation process control that changes the process parameters such as medium flow, pressure, temperature, and liquid level by receiving the control signal output by the regulating control unit and using power operation. It is generally composed of an actuator and a valve. According to the stroke characteristics, the regulating valve can be divided into straight stroke and angular stroke; according to the power used by the actuator, it can be divided into three types: pneumatic regulating valve, electric regulating valve, and hydraulic regulating valve; according to its function and characteristics, it can be divided into three types: linear characteristics, equal percentage characteristics, and parabolic characteristics. The regulating valve is suitable for air, water, steam, various corrosive media, mud, oil and other media. In the automatic control of modern factories, regulating valves play a very important role. The production of these factories depends on the correct distribution and control of the flowing medium.

[0003] Among the regulating valves, the pneumatic regulating valve uses compressed gas as the power source, the cylinder as the actuator, and uses accessories such as valve positioners, converters, solenoid valves, position-holding valves, gas storage tanks, gas filters, etc. to drive the valve to achieve switch quantity or proportional regulation, and receive control signals from industrial automation control systems to adjust the pipeline medium: flow, pressure, temperature, liquid level and other process parameters. The characteristics of the pneumatic regulating valve are simple control, fast response, and inherent safety, and no additional explosion-proof measures are required.

[0004] However, in the actual working process, there is a big problem with the regulating valve. The sliding parts in pneumatic machines such as solenoid valves and cylinders need to move frequently. If these mechanical components become stuck, the regulating valve or solenoid valve will not move smoothly or even not move, thus affecting the continuity of production. In particular, there are great safety hazards for important production processes. Summary of the invention

[0005] The object of the present invention is to provide an oil mist lubrication device for a regulating valve, aiming to solve the problem of the regulating valve being stuck.

[0006] To achieve the above object, the technical solution adopted by the present invention is: to provide an oil mist lubrication device for a regulating valve, comprising:

[0007] An air supply pipe, one end of which is used to connect to the air pump, and the other end of which is used to connect to the pneumatic regulating valve; the air supply pipe is provided with a plurality of variable diameter pipes;

[0008] A diameter-changing mechanism, disposed on the variable diameter tube, for changing the inner diameter of the variable diameter tube, thereby changing the air flow rate inside the variable diameter tube;

[0009] A plurality of suction pipes, one end of which is connected to the side wall of the variable diameter pipe and the other end of which is connected to an oil tank for carrying lubricating oil, and is used to transport lubricating oil into the air supply pipe;

[0010] The flow meter is arranged on the suction pipe and is used for measuring the flow of the lubricating oil in the suction pipe.

[0011] As another embodiment of the present application, a plurality of the variable diameter tubes are connected in series to the air supply pipe, and the air in the air supply pipe passes through the plurality of the variable diameter tubes in sequence.

[0012] As another embodiment of the present application, a plurality of the variable diameter pipes are connected in parallel to the air supply pipe.

[0013] As another embodiment of the present application, the variable diameter tube includes a rubber tube; both ends of the rubber tube are socketed with the air supply tube; and both ends of the rubber tube are provided with locking pieces for locking the rubber tube and the air supply tube.

[0014] As another embodiment of the present application, the diameter-changing mechanism includes:

[0015] A sleeve, which is sleeved on the outside of the rubber tube, with an inner wall spaced apart from the outer wall of the rubber tube and a length greater than that of the variable diameter tube;

[0016] An air bag is circumferentially arranged between the sleeve and the rubber tube along the side wall of the sleeve;

[0017] an inflatable member, connected to the airbag and used to inflate the airbag;

[0018] End covers are arranged at both ends of the sleeve and are used to seal the sleeve.

[0019] As another embodiment of the present application, a conical head is provided at the connecting end of the air supply pipe and the rubber tube to prevent turbulence when air flows from the air supply pipe to the rubber tube or from the rubber tube to the air supply pipe.

[0020] As another embodiment of the present application, the conical head includes a plurality of arc-shaped sheets arranged at intervals along the circumferential direction of the end surface of the air supply pipe, and the plurality of arc-shaped sheets are all elastic members.

[0021] As another embodiment of the present application, a plurality of arc-shaped rods are arranged in the inner circumference of the sleeve, the radial direction of the plurality of arc-shaped rods is coplanar with the radial direction of the sleeve, and the tops of the plurality of arc-shaped rods are all facing the rubber tube; both ends of the plurality of arc-shaped rods are slidably connected to the end cover.

[0022] As another embodiment of the present application, a rigid frame is provided inside the rubber tube along the axial direction to limit the minimum inner diameter of the rubber tube and prevent blockage when the inner diameter of the rubber tube is reduced.

[0023] As another embodiment of the present application, a nozzle is provided at the connecting end of the suction tube and the variable diameter tube so that the lubricating oil can be sprayed out evenly.

[0024] The beneficial effects of the regulating valve oil mist lubrication device provided by the present invention are as follows: compared with the prior art, the regulating valve oil mist lubrication device of the present invention connects the air pump and the pneumatic regulating valve through an air supply pipe, and the gas in the air pump is transmitted to the pneumatic regulating valve through the air supply pipe to control the opening and closing of the regulating valve; the inner diameters of a plurality of variable diameter pipes are adjusted through a reducing mechanism so that the inner diameter of the variable diameter pipe is smaller than the inner diameter of the air supply pipe. When air enters the variable diameter pipe from the air supply pipe, the cross section is reduced, the flow rate is increased, the pressure in the upstream air supply pipe is P1, and the pressure in the variable diameter pipe is reduced to P2. When the pressure difference △P between P1 and P2 is greater than the force ρgh required to suck the lubricating oil in the oil tank into the variable diameter pipe through the suction pipe, the lubricating oil is sucked into the variable diameter pipe, and the lubricating oil entering the variable diameter pipe is mixed with air to form oil mist. The oil mist enters the pneumatic regulating valve along the air supply pipe to lubricate the components in the pneumatic regulating valve and prevent the components in the pneumatic regulating valve from getting stuck.

[0025] The air pressure supplied by the air pump to the pneumatic regulating valve remains stable, but as the lubricating oil in the oil tank is sucked into the variable diameter pipe, the liquid level in the oil tank drops, the height difference between the liquid level and the variable diameter pipe becomes larger, and the pressure to suck the lubricating oil from the oil tank into the variable diameter pipe increases. The inner diameter of the variable diameter pipe is controlled to decrease through the reducing mechanism. After the inner diameter of the variable diameter pipe is reduced, the flow rate in the variable diameter pipe continues to increase, P2 continues to decrease, and then △P increases, and the lubricating oil after the liquid level is lowered is sucked into the variable diameter pipe, and the oil mist in the air supply pipe is continuously supplied. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of an oil mist lubrication device for a regulating valve provided in one embodiment of the present invention;

[0028] Figure 2 A schematic structural diagram of an oil mist lubrication device for a regulating valve provided in yet another embodiment of the present invention;

[0029] Figure 3A schematic diagram of the structure of a variable diameter pipe provided by an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the structure of a variable diameter pipe provided by another embodiment of the present invention;

[0031] In the figure:

[0032] 1. Air supply pipe; 2. Variable diameter pipe; 21. Locking piece.

[0033] 3. Variable diameter mechanism; 31. Sleeve; 32. Air bag; 33. End cover; 34. Inflatable part; 341. Valve;

[0034] 4. Straw; 5. Oil tank; 6. Flow meter; 7. Arc sheet; 8. Arc rod; 9. Rigid frame. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] Please also read Figure 1 and Figure 2, the regulating valve oil mist lubrication device provided by the present invention is now described. The regulating valve oil mist lubrication device includes an air supply pipe 1, a diameter reducing mechanism 3, a suction pipe 4 and a flow meter 6. One end of the air supply pipe 1 is connected to an air pump, and the other end is connected to a pneumatic regulating valve. The air pump supplies air to the pneumatic regulating valve through the air supply pipe 1, provides power to the pneumatic regulating valve, and controls the opening and closing of the pneumatic regulating valve; the air supply pipe 1 is divided into several sections in the middle, and two adjacent sections of the air supply pipe 1 are connected in the middle by a variable diameter pipe 2. Each variable diameter pipe 2 is provided with a diameter reducing mechanism 3, and the inner diameter of the variable diameter pipe 2 can be controlled by the diameter reducing mechanism 3; each variable diameter pipe 2 is connected with a suction pipe 4, and the other end of the suction pipe 4 extends below the liquid level of the lubricating oil in the oil tank 5 located below the variable diameter pipe 2; after the air pump is turned on, the air in the air pump flows in the air supply pipe 1 and the variable diameter pipe 2, and the flowing air has a certain pressure. The pressure of the air in the air supply pipe 1 is P1, and the pressure of the air in the air supply pipe 1 is P1. The inner diameter of the variable diameter tube 2 is reduced by the reducing mechanism 3, and the flow rate of air in the variable diameter tube 2 increases, and the pressure is P2. The variable diameter tube 2 and the air supply pipes 1 at both ends form a Venturi tube. According to Bernoulli's principle, the greater the air flow rate, the smaller the pressure, so P1 is greater than P2, and the pressure difference between the two is △P. The flowing air can suck the lubricating oil in the oil tank 5 into the variable diameter tube 2. The pressure required to suck the lubricating oil from the oil tank 5 into the variable diameter tube 2 is ρgh, where ρ is the density of the lubricating oil, and h is the height difference between the liquid level of the oil tank 5 and the variable diameter tube 2. When △P≥ρgh, the lubricating oil is sucked into the variable diameter tube 2 by air pressure, and the lubricating oil is mixed with the air flowing in the variable diameter tube 2 to form oil mist. The formed oil mist enters the pneumatic control valve through the air supply pipe 1, adheres to the surfaces of various components of the pneumatic control valve, and plays a lubricating role.

[0037] The air pressure supplied by the air pump to the pneumatic regulating valve remains stable, but as the lubricating oil in the oil tank 5 is sucked into the variable diameter tube 2, the liquid level in the oil tank 5 drops, and the height difference between the liquid level and the variable diameter tube 2 becomes larger, the pressure of sucking the lubricating oil from the oil tank 5 into the variable diameter tube 2 increases, and the inner diameter of the variable diameter tube 2 is controlled to decrease through the variable diameter mechanism 3. After the inner diameter of the variable diameter tube 2 is reduced, the flow rate in the variable diameter tube 2 continues to increase, P2 continues to decrease, and then △P increases, and the lubricating oil after the liquid level is lowered is sucked into the variable diameter tube 2, and the oil mist in the air supply pipe 1 is continuously supplied.

[0038] The flow meter 6 is arranged on the suction pipe 4 , and the flow rate of the lubricating oil in the suction pipe 4 is observed in real time by the flow meter 6 . After observing that the flow rate of the lubricating oil in the suction pipe 4 decreases, the inner diameter of the variable diameter pipe 2 is reduced by the diameter reducing mechanism 3 .

[0039] Compared with the prior art, the oil mist lubrication device for a regulating valve provided by the present invention connects an air pump and a pneumatic regulating valve through an air supply pipe 1, and the gas in the air pump is transmitted to the pneumatic regulating valve through the air supply pipe 1 to control the opening and closing of the regulating valve; the inner diameters of a plurality of variable diameter pipes 2 are adjusted through a reducing mechanism 3 so that the inner diameter of the variable diameter pipe 2 is smaller than the inner diameter of the air supply pipe 1, and when air enters the variable diameter pipe 2 from the air supply pipe 1, the cross section is reduced and the flow rate is increased. The pressure in the upstream air supply pipe 1 is P1, and the pressure in the variable diameter pipe 2 is reduced to P2. When the pressure difference △P between P1 and P2 is greater than the force ρgh required to suck the lubricating oil in the oil tank 5 into the variable diameter pipe 2 through the suction pipe 4, the lubricating oil is sucked into the variable diameter pipe 2, and the lubricating oil entering the variable diameter pipe 2 is mixed with air to form oil mist, which enters the pneumatic regulating valve along the air supply pipe 1 to lubricate the components in the pneumatic regulating valve and prevent the components in the pneumatic regulating valve from getting stuck.

[0040] As a specific implementation of the oil mist lubrication device for the regulating valve provided by the present invention, please refer to Figure 1 A plurality of variable diameter tubes 2 are connected in series on the air supply pipe 1. According to the number of variable diameter tubes 2, the air supply pipe 1 is divided into a plurality of sections. A variable diameter tube 2 is connected between two adjacent sections of the air supply pipe 1. Each variable diameter tube 2 is connected to a suction tube 4. The other end of the suction tube 4 is connected to the main pipe. The main pipe extends below the liquid level of the oil tank 5. The air in the air supply pipe 1 passes through the plurality of variable diameter tubes 2 in sequence. When passing through each variable diameter tube 2, a pressure difference △P is formed, and the lubricating oil in the oil tank 5 is sucked into the variable diameter tube 2. The oil mist in the plurality of variable diameter tubes 2 is mixed together to lubricate the components of the pneumatic valve, thereby ensuring the abundance of oil mist in the air supply pipe 1.

[0041] As a specific implementation of the embodiment of the present invention, please refer to Figure 2 , a plurality of variable diameter tubes 2 are connected in parallel to the air supply pipe 1, and a conversion joint is installed at the outlet of the air supply pipe 1 upstream of the variable diameter tube 2. The conversion joint has an air inlet and a plurality of air outlets. The air inlet is connected to the outlet of the air supply pipe 1, and the air outlets are respectively connected to the inlets of the plurality of variable diameter tubes 2. The air is diverted from the air supply pipe 1 to the plurality of variable diameter tubes 2. It cannot be ensured that the air flow velocity in each variable diameter tube 2 is the same, so a flow meter 6 is provided on the suction pipe 4 connected to each variable diameter tube 2. According to the flow rate of the lubricating oil measured by each flow meter 6, the inner diameter of the variable diameter tube 2 is adjusted in real time to ensure that each variable diameter tube 2 can suck the lubricating oil in the oil tank 5 into the variable diameter tube 2; the outlet of the variable diameter tube 2 is also connected to the downstream air supply pipe 1 through a conversion joint. After the lubricating oil entering each variable diameter tube 2 forms oil mist, it converges in the downstream air supply pipe 1 and then enters the pneumatic control valve, thereby ensuring the supply of oil mist to the pneumatic control valve.

[0042] As a specific implementation of an embodiment of the present invention, the variable diameter tube 2 includes a rubber tube. When the variable diameter tube 2 is connected in series, the two ends of the rubber tube are sleeved on the air supply pipe 1. The rubber tube itself has a certain elasticity. The variable diameter mechanism 3 changes the inner diameter of the rubber tube by radially squeezing the rubber tube inward. In order to prevent the two ends of the rubber tube from falling off the air supply pipe 1 when the rubber tube is deformed, the two ends of the rubber tube are fastened to the air supply pipe 1 with a strapping tape, and the strapping tape serves as a locking piece 21 to lock the rubber tube to the air supply pipe 1.

[0043] In this embodiment, an annular groove is provided on the outer wall of the connecting end of the air supply pipe 1 and the rubber tube. After the rubber tube is put on the air supply pipe 1, the strapping belt is aligned with the groove of the air supply pipe 1, and the strapping belt is tightened. The strapping belt is embedded in the groove to prevent slipping under force.

[0044] Similarly, when the variable diameter tubes 2 are connected in parallel, the two ends of the rubber tube are respectively put on the conversion joints and tied tightly with binding tape.

[0045] As a specific implementation of the embodiment of the present invention, please refer to Figures 1 to 4 The diameter-changing mechanism 3 includes a sleeve 31, an airbag 32, an inflatable member 34 and an end cover 33; the sleeve 31 is sleeved on the rubber tube, and the inner wall of the sleeve 31 is spaced a certain distance from the outer wall of the rubber tube. The airbag 32 is arranged in the gap between the inner wall of the sleeve 31 and the outer wall of the rubber tube. The two ends of the sleeve 31 are blocked by the end cover 33. The sleeve 31, the rubber tube and the end cover 33 form a closed space. The airbag 32 is located in the closed space. The inflatable member 34 penetrates the side wall of the sleeve 31 and is connected to the airbag 32 to inflate the airbag 32. After the airbag 32 is inflated, it expands in the closed space, compresses the side wall of the rubber tube, and reduces the inner diameter of the rubber tube.

[0046] In this embodiment, the inflatable member 34 is an air pump, which is electrically connected to the PLC controller. The flow meter 6 is an electronic flow meter 6, which is also electrically connected to the PLC controller. The minimum flow value of the flow meter 6 is preset in the controller. When the flow rate of the lubricating oil measured in real time by the flow meter 6 is less than the preset minimum flow value, the controller turns on the air pump to inflate the airbag 32. After being inflated, the airbag 32 expands and squeezes the rubber tube. The inner diameter of the rubber tube decreases, △P increases, and the flow rate of the lubricating oil in the straw 4 is increased to prevent the straw 4 from being interrupted.

[0047] A valve 341 is provided between the air pump 34 and the air bag 32. When inflating, the valve 341 is opened, and after the inflation is completed, the valve 341 is closed.

[0048] As a specific implementation of the embodiment of the present invention, please refer to Figure 3A conical head is provided at the connecting end of the air supply pipe 1 and the rubber tube. The large-diameter end of the conical head is connected to the end face of the air supply pipe 1. The top of the cone is open to form a conical channel. When the air enters the variable-diameter tube 2 from the air supply pipe 1 or enters the air supply pipe 1 from the variable-diameter tube 2, it passes through the conical channel. The air flows smoothly in the conical channel, preventing turbulence when the air flows from the air supply pipe 1 to the rubber tube or from the rubber tube to the air supply pipe 1, thereby affecting the mixing of air and lubricating oil.

[0049] In this embodiment, the conical head includes a plurality of arc-shaped pieces 7 arranged at circumferential intervals along the end face of the air supply pipe 1, one end of the plurality of arc-shaped pieces 7 is connected to the end face of the air supply pipe 1, and the other end is a free end. When the inner diameter of the variable diameter tube 2 is reduced, the arc-shaped pieces 7 are compressed toward the axis and bent. After being bent, the plurality of arc-shaped pieces 7 form a conical head.

[0050] The arc-shaped piece 7 is an elastic piece made of stainless steel. After the force disappears, the arc-shaped piece 7 returns to its original state without affecting the flow of air in the air supply pipe 1 and the variable diameter pipe 2.

[0051] As a specific implementation of the embodiment of the present invention, please refer to Figure 4 A plurality of arc-shaped rods 8 are arranged circumferentially inside the sleeve 31, and the radial direction of the plurality of arc-shaped rods 8 is coplanar with the radial direction of the sleeve 31, that is, the sector surrounded by the arc-shaped rods 8 is parallel to the radial direction of the sleeve 31, and the tops of the plurality of arc-shaped rods 8 are all facing the rubber tube; both ends of the plurality of arc-shaped rods 8 are slidably connected with the end covers 33, and after the airbag 32 is inflated, the arc-shaped rods 8 are pressed toward the axis of the rubber tube, and the arc-shaped rods 8 press the rubber tube, and the plurality of arc-shaped rods 8 arranged circumferentially press the rubber tube into a spindle shape with a thin middle and thick ends, and combined with the air supply pipes 1 at both ends of the rubber tube, a Venturi tube is formed.

[0052] The arc rod 8 is made of elastic material. After the force disappears, the arc rod 8 returns to its original state to ensure the fluidity inside the rubber tube.

[0053] As a specific implementation of the embodiment of the present invention, please refer to Figure 4 A rigid skeleton 9 is axially arranged inside the rubber tube, and the rigid skeleton 9 is formed into a cylindrical shape coaxial with the rubber tube, which is used to limit the minimum inner diameter of the rubber tube. The rubber tube shrinks continuously under pressure, and after shrinking until the inner wall fits with the rigid skeleton 9, the rigid skeleton 9 prevents the rubber tube from continuing to shrink, thereby avoiding blockage when the inner diameter of the rubber tube is reduced.

[0054] As a specific implementation of the embodiment of the present invention, please refer to Figure 4 A nozzle is provided at the connection end of the suction pipe 4 and the variable diameter pipe 2 to spray the lubricating oil evenly. After the lubricating oil is sprayed, it is fully combined with the air in the variable diameter pipe 2 to form oil mist.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Oil mist lubrication device for regulating valve, characterized in that: include: An air supply pipe, one end of which is used to connect to the air pump, and the other end of which is used to connect to the pneumatic regulating valve; the air supply pipe is provided with a plurality of variable diameter pipes; A diameter-changing mechanism, disposed on the variable diameter tube, for changing the inner diameter of the variable diameter tube, thereby changing the air flow rate inside the variable diameter tube; A plurality of suction pipes, one end of which is connected to the side wall of the variable diameter pipe and the other end of which is connected to an oil tank for carrying lubricating oil, and is used to transport lubricating oil into the air supply pipe; A flow meter, disposed on the suction pipe, for measuring the flow of the lubricating oil in the suction pipe; The variable diameter tube comprises a rubber tube; both ends of the rubber tube are sleeved with the air supply tube; both ends of the rubber tube are provided with locking pieces for locking the rubber tube and the air supply tube; The diameter-changing mechanism comprises: A sleeve, which is sleeved on the outside of the rubber tube, with an inner wall spaced apart from the outer wall of the rubber tube and a length greater than that of the variable diameter tube; An air bag is circumferentially arranged between the sleeve and the rubber tube along the side wall of the sleeve; an inflatable member, connected to the airbag and used to inflate the airbag; End covers are arranged at both ends of the sleeve and are used to seal the sleeve.

2. The oil mist lubrication device for a regulating valve according to claim 1, characterized in that: A plurality of the variable diameter tubes are connected in series to the air supply pipe, and the air in the air supply pipe passes through the plurality of the variable diameter tubes in sequence.

3. The oil mist lubrication device for a regulating valve according to claim 1, characterized in that: A plurality of the variable diameter pipes are connected in parallel to the air supply pipe.

4. The oil mist lubrication device for a regulating valve according to claim 1, characterized in that: The connecting end of the air supply pipe and the rubber tube is provided with a conical head for preventing turbulence when air flows from the air supply pipe to the rubber tube or from the rubber tube to the air supply pipe.

5. The oil mist lubrication device for a regulating valve according to claim 4, characterized in that: The conical head comprises a plurality of arc-shaped pieces which are arranged at intervals along the circumferential direction of the end surface of the air supply pipe, and the plurality of arc-shaped pieces are all elastic parts.

6. The oil mist lubrication device for a regulating valve according to claim 1, characterized in that: A plurality of arc-shaped rods are arranged circumferentially inside the sleeve, the radial direction of the arc-shaped rods is coplanar with the radial direction of the sleeve, and the tops of the arc-shaped rods are all facing the rubber tube; both ends of the arc-shaped rods are slidably connected to the end cover.

7. The oil mist lubrication device for a regulating valve according to any one of claims 4 to 6, characterized in that: A rigid frame is provided inside the rubber tube along the axial direction, which is used to limit the minimum inner diameter of the rubber tube and prevent the rubber tube from being blocked when the inner diameter is reduced.

8. The oil mist lubrication device for a regulating valve according to claim 1, characterized in that: The connection end of the suction pipe and the variable diameter pipe is provided with a spray head so that the lubricating oil can be sprayed out evenly.

Images