Screw rod lubricating device of three-way valve

Abstract

The utility model relates to the field of three-way valves, in particular to a screw rod lubricating device of a three-way valve, which comprises an oiling cover arranged at the tail end of a gear box, the inner side of the oiling cover is connected with the inside of the gear box, and an oiling nozzle is arranged on the outer side of the oiling cover. The oil nipple has one-way passing ability allowing lubricating grease to enter the inner side from the outer side of the oil filling cover. According to the embodiment of the utility model, lubricating grease is allowed to be injected into the inner side of the oil filling cover through the oil filling nozzle, so that the lubricating grease overflows along a gap between the screw rod and the copper thread bushing in a closed environment of the gear box, and effective lubrication on key friction parts is realized.

Description

Technical Field

[0001] This utility model relates to the field of three-way valves, specifically to a screw lubrication device for a three-way valve. Background Technology

[0002] The filament junction melt three-way valve is mainly composed of valve body 1, valve core, electric actuator 2, copper threaded sleeve and gearbox 3. The valve body 1 carries the flow channel of the melt. The electric actuator 2 receives instructions from the distributed control system and drives the valve core to move in the valve body 1 to realize the opening and closing control of different outlets. The copper threaded sleeve connects the valve core screw and the electric actuator 2. The gearbox 3 provides the necessary speed change and torque conversion for the transmission process to ensure the smooth movement of the valve core.

[0003] Because copper is relatively soft, copper threaded sleeves are prone to wear during frequent mechanical transmission, which leads to a significant increase in friction between the lead screw and the copper threaded sleeve. This not only causes the torque of the electric actuator to frequently exceed the normal range, but also directly causes the valve to malfunction, posing a serious threat to production and causing adverse consequences such as fluctuations in the quality of filament products and production interruptions.

[0004] Because polyester production is a continuous process, it typically operates 24 hours a day without interruption. The copper sleeve can only be replaced during shutdown maintenance, which results in a long replacement cycle and seriously affects production efficiency. In daily production and maintenance, in order to minimize the friction between the copper threaded sleeve and the valve core screw, operators can only manually apply a small amount of grease to the screw within a limited operating space.

[0005] However, due to the short working stroke of the valve, manual application makes it difficult to ensure that the grease evenly and fully covers the contact area between the lead screw and the copper threaded sleeve, thus failing to achieve comprehensive and effective lubrication. Furthermore, the high ambient temperature at the polyester production site causes the grease applied to the lead screw to easily melt and drip, further weakening the lubrication effect. Utility Model Content

[0006] The purpose of this invention is to provide a lubrication device for the lead screw of a three-way valve, so as to solve the problem that the contact part between the lead screw and the copper threaded sleeve of a traditional three-way valve is difficult to lubricate.

[0007] To solve the above-mentioned technical problems, this utility model specifically provides the following technical solution:

[0008] A lubrication device for a three-way valve screw includes a lubrication cover installed at the end of a gearbox, the inner side of which is connected to the interior of the gearbox, and a lubrication nozzle provided on the outer side of the lubrication cover, the lubrication nozzle having unidirectional permeability allowing lubricating grease to enter the inner side from the outer side of the lubrication cover.

[0009] Furthermore, the top of the refueling cover is provided with an overflow port.

[0010] On the other hand, it also includes a constant pressure grease injection mechanism installed on the grease reservoir. The constant pressure grease injection mechanism is used to store grease and gradually inject it into the interior of the grease reservoir at a preset pressure. The constant pressure grease injection mechanism includes a reservoir cylinder, a piston, and a spring. One end of the reservoir cylinder is connected to the grease reservoir. The piston is axially slidable inside the reservoir cylinder. The spring connects the piston and the other end of the reservoir cylinder. The spring exerts a thrust on the piston toward the grease reservoir through its own elasticity.

[0011] Furthermore, an annular oil-blocking plate is provided at the connection between the oil storage cylinder and the oil filling cover, and the oil-blocking plate is used to form a throat between the oil storage cylinder and the oil filling cover.

[0012] Furthermore, a nut and a lead screw are installed at one end of the oil reservoir. The nut is coaxially connected to the oil reservoir via a bearing seat. The bearing seat allows the nut to rotate while preventing the nut from moving axially. The lead screw is threadedly connected to the nut. The two ends of the spring are respectively connected to the lead screw and the piston.

[0013] Furthermore, the bearing housing includes a first bearing, a second bearing, and an end cap. The end of the oil reservoir is provided with a step. The first bearing is installed below the step, and the second bearing is installed above the step. The first bearing and the second bearing are respectively connected to the two ends of the nut. The end cap connects the second bearing and the end of the oil reservoir.

[0014] Furthermore, the nut has a radially outwardly extending annular flange at its center, which is used to connect to the second bearing.

[0015] Furthermore, one end of the nut is provided with a transmission cylinder portion that extends axially and is away from the piston. The transmission cylinder portion has a prismatic outer wall. The constant pressure oil injection mechanism also includes a handle. The handle includes a sleeve portion that is inserted into the transmission cylinder portion and a handle portion that is connected to the sleeve portion. The sleeve portion has a prismatic inner wall.

[0016] Furthermore, one end of the piston is connected to a guide rod, and the lead screw is provided with a guide hole that axially passes through itself, and the guide rod is slidably connected to the guide hole.

[0017] Furthermore, the axial length of the guide rod is greater than the axial length of the lead screw, the top of the guide rod is always higher than the top of the lead screw, and the outer wall of the guide rod is provided with axially distributed graduations.

[0018] Compared with the prior art, this application has the following advantages:

[0019] A lubrication device for a three-way valve screw is provided, which allows grease to be injected into the inside of the lubrication cover through the grease nipple, so that the grease overflows along the gap between the screw and the copper threaded sleeve in the closed environment of the gearbox, thereby achieving effective lubrication of key friction parts. Attached Figure Description

[0020] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] Figure 1 This is a perspective view of the first embodiment of the present invention;

[0022] Figure 2 This is a perspective view of the second embodiment of the present invention;

[0023] Figure 3 This is a perspective view of a partial structure of the second embodiment of the present invention;

[0024] Figure 4 This is a front view of a partial structure of the second embodiment of the present invention;

[0025] Figure 5 for Figure 4 A cross-sectional view along the AA direction;

[0026] The labels in the diagram represent the following:

[0027] 1-Valve body; 2-Electric actuator; 3-Gearbox; 4-Oil filling cover; 41-Oil filling nozzle; 5-Constant pressure oil filling mechanism; 51-Oil reservoir; 511-Oil baffle plate; 512-Step; 52-Piston; 521-Guide rod; 53-Spring; 54-Nut; 541-Transmission cylinder; 542-Annular flange; 55-Lead screw; 56-Bearing seat; 561-First bearing; 562-Second bearing; 563-End cover; 57-Handle; 571-Sleeve; 572-Handle; 573-Observation window. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] To address the difficulty in lubricating the contact area between the lead screw and the copper threaded sleeve in traditional three-way valves, a lead screw lubrication device for three-way valves is provided, hereinafter referred to as the lead screw lubrication device.

[0030] (First embodiment, reference) Figure 1 )

[0031] The screw lubrication device includes a lubrication cover 4 installed at the end of the gearbox 3. The inside of the lubrication cover 4 is connected to the inside of the gearbox 3, and the outside of the lubrication cover 4 is provided with a lubrication nozzle 41. The lubrication nozzle 41 has one-way passage that allows grease to enter the inside from the outside of the lubrication cover 4.

[0032] Workers inject grease into the inside of the grease cover 4 through the grease nozzle 41. In the sealed environment of the gearbox 3, the grease overflows along the gap between the lead screw 55 and the copper threaded sleeve, effectively lubricating the key friction parts and thus ensuring the stable operation of the three-way valve.

[0033] In addition, the top of the grease filling cover 4 is equipped with an overflow port. By observing the amount of grease overflowing from the overflow port, staff can determine whether there is sufficient grease inside the grease filling cover 4, and whether the grease nipple is clogged.

[0034] (Second embodiment, see reference) Figure 2 , Figure 3 , Figure 4 , Figure 5 )

[0035] Because grease needs to be injected into the inside of the lubrication cover 4 frequently, and it is difficult for staff to observe the amount of grease inside the lubrication cover 4, it is difficult to determine when to replenish the grease, which can easily lead to the problem of insufficient lubrication of the lead screw 55.

[0036] In order to reduce the frequency of adding grease by the staff, the second embodiment, based on the first embodiment, installs a constant pressure grease injection mechanism 5 on the grease filling cover 4. The mechanism can store a certain amount of grease and can gradually inject it into the grease filling cover 4 at a preset pressure.

[0037] The constant pressure oil injection mechanism 5 includes an oil reservoir 51, a piston 52, and a spring 53. One end of the oil reservoir 51 is connected to the oil filling cover 4. The piston 52 is axially slidable inside the oil reservoir 51. The spring 53 connects the piston 52 and the other end of the oil reservoir 51. The spring 53 exerts a thrust on the piston 52 toward the oil filling cover 4 through its own elasticity, thereby squeezing the grease inside the oil reservoir 51 into the gap between the lead screw 55 and the copper threaded sleeve.

[0038] The oil reservoir 51 is used to store additional grease, and the internal volume of the oil reservoir 51 is gradually reduced by the spring 53 and the piston 52, thereby achieving the purpose of gradually injecting grease into the inside of the oil filling cover 4.

[0039] Furthermore, if the diameter of the oil reservoir 51 is large, the speed at which the oil reservoir 51 delivers grease to the oil filling cover 4 will be too fast; if the diameter of the oil reservoir 51 is small, the capacity of the oil reservoir 51 to store grease will be too small. To solve this problem, an annular oil-blocking plate 511 is provided at the connection between the oil reservoir 51 and the oil filling cover 4. The oil-blocking plate 511 is used to form a narrow throat between the oil reservoir 51 and the oil filling cover 4, thereby slowing down the speed at which the grease moves from the oil reservoir 51 to the oil filling cover 4.

[0040] Furthermore, since the elastic force of the spring 53 gradually decreases as it elongates, in order to ensure that the pressure of the hydraulic oil inside the oil reservoir 51 and the oil filling cover 4 is constant, a nut 54 and a lead screw 55 are installed at one end of the oil reservoir 51. The nut 54 is coaxially connected to the oil reservoir 51 through a bearing seat 56. The bearing seat 56 allows the nut 54 to rotate while preventing the nut 54 from moving axially. The lead screw 55 is threadedly connected to the nut 54. The two ends of the spring 53 are respectively connected to the lead screw 55 and the piston 52.

[0041] The operator can rotate the nut 54 to drive the lead screw 55 to move axially, thereby changing the distance between the lead screw 55 and the piston 52, which in turn causes the extended spring 53 to be compressed again, thus ensuring the constant elastic force of the spring 53.

[0042] Specifically, the bearing housing 56 includes a first bearing 561, a second bearing 562, and an end cap 563. The end of the oil reservoir 51 is provided with a step 512. The first bearing 561 is installed below the step 512, and the second bearing 562 is installed above the step 512. The first bearing 561 and the second bearing 562 are respectively connected to the two ends of the nut 54. The end cap 563 connects the second bearing 562 and the end of the oil reservoir 51.

[0043] One end of the nut 54 is provided with a transmission cylinder portion 541 that extends axially away from the piston 52. The transmission cylinder portion 541 has a prismatic outer wall. The constant pressure oil injection mechanism 5 also includes a handle 57. The handle 57 includes a sleeve portion 571 that is inserted into the transmission cylinder portion 541 and a handle portion 572 that is connected to the sleeve portion 571. The sleeve portion 571 has a prismatic inner wall. The handle portion 572 is used for the operator to hold. The sleeve portion 571 and the transmission cylinder portion 541 are used to transmit torque from the handle portion 572 to the nut 54.

[0044] The nut 54 has a radially outwardly extending annular flange 542 in the middle, which is used to connect the second bearing 562. This allows the inner diameter of the second bearing 562 to be appropriately increased, so that the wall thickness of the transmission cylinder 541 passing between the inner wall of the second bearing 562 and the outer wall of the lead screw 55 meets the strength requirements.

[0045] Furthermore, one end of the piston 52 is connected to a guide rod 521, and the lead screw 55 is provided with a guide hole that axially passes through itself. The guide rod 521 is slidably connected to the guide hole. This design is used to prevent the piston 52 from flipping inside the oil reservoir 51.

[0046] Furthermore, the axial length of the guide rod 521 is greater than the axial length of the lead screw 55, and the top of the guide rod 521 is always higher than the top of the lead screw 55. The outer wall of the guide rod 521 is provided with axially distributed scales. This design allows the operator to visually estimate the distance between the top of the guide rod 521 and the top of the lead screw 55, thereby determining the length of the spring 53 at this time, and thus determining the internal pressure of the oil reservoir 51.

[0047] Furthermore, both the sleeve portion 571 and the handle portion 572 have observation windows 573 that extend radially through them. The observation windows 573 are used to expose the guide rod 521, thereby facilitating visual inspection of the scale by the operator.

[0048] The above embodiments are merely exemplary embodiments of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this utility model within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of this utility model.

Claims

1. A screw lubrication device for a three-way valve, characterized in that, The system includes a grease cover (4) installed at the end of the gearbox (3), the inside of which is connected to the interior of the gearbox (3), and a grease nozzle (41) provided on the outside of the grease cover (4), which has a one-way passage that allows grease to enter the inside from the outside of the grease cover (4).

2. The screw lubrication device for a three-way valve according to claim 1, characterized in that, The top of the refueling cover (4) is provided with an overflow port.

3. The screw lubrication device for a three-way valve according to claim 1, characterized in that, It also includes a constant pressure oil injection mechanism (5) installed on the oil filling cover (4). The constant pressure oil injection mechanism (5) is used to store grease and gradually inject it into the interior of the oil filling cover (4) at a preset pressure. The constant pressure oil injection mechanism (5) includes an oil reservoir (51), a piston (52) and a spring (53). One end of the oil reservoir (51) is connected to the oil filling cover (4). The piston (52) is axially slidably disposed inside the oil reservoir (51). The spring (53) connects the piston (52) and the other end of the oil reservoir (51). The spring (53) applies a thrust to the piston (52) towards the oil filling cover (4) through its own elastic force.

4. The screw lubrication device for a three-way valve according to claim 3, characterized in that, An annular oil-blocking plate (511) is provided at the connection between the oil storage cylinder (51) and the oil filling cover (4). The oil-blocking plate (511) is used to form a throat between the oil storage cylinder (51) and the oil filling cover (4).

5. The screw lubrication device for a three-way valve according to claim 3, characterized in that, A nut (54) and a lead screw (55) are installed at one end of the oil reservoir (51). The nut (54) is coaxially connected to the oil reservoir (51) through a bearing seat (56). The bearing seat (56) allows the nut (54) to rotate while preventing the nut (54) from moving axially. The lead screw (55) is threadedly connected to the nut (54). The two ends of the spring (53) are respectively connected to the lead screw (55) and the piston (52).

6. The screw lubrication device for a three-way valve according to claim 5, characterized in that, The bearing housing (56) includes a first bearing (561), a second bearing (562), and an end cap (563). The end of the oil reservoir (51) is provided with a step (512). The first bearing (561) is installed below the step (512), and the second bearing (562) is installed above the step (512). The first bearing (561) and the second bearing (562) are respectively connected to the two ends of the nut (54). The end cap (563) connects the second bearing (562) and the end of the oil reservoir (51).

7. The screw lubrication device for a three-way valve according to claim 6, characterized in that, The nut (54) has a radially outwardly extending annular flange (542) at its center, which is used to connect the second bearing (562).

8. The screw lubrication device for a three-way valve according to claim 5, characterized in that, One end of the nut (54) is provided with a transmission cylinder (541) that extends axially away from the piston (52). The transmission cylinder (541) has a prismatic outer wall. The constant pressure oil injection mechanism (5) also includes a handle (57). The handle (57) includes a sleeve (571) that is inserted into the transmission cylinder (541) and a handle (572) that is connected to the sleeve (571). The sleeve (571) has a prismatic inner wall.

9. The screw lubrication device for a three-way valve according to claim 5, characterized in that, One end of the piston (52) is connected to a guide rod (521), and the lead screw (55) is provided with a guide hole that passes through itself axially. The guide rod (521) is slidably connected to the guide hole.

10. The screw lubrication device for a three-way valve according to claim 9, characterized in that, The axial length of the guide rod (521) is greater than the axial length of the lead screw (55), the top of the guide rod (521) is always higher than the top of the lead screw (55), and the outer wall of the guide rod (521) is provided with axially distributed scales.

Images