CN205654878U - Gravity compensation mechanism and governing valve of governing valve - Google Patents
Gravity compensation mechanism and governing valve of governing valve Download PDFInfo
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- CN205654878U CN205654878U CN201620362945.2U CN201620362945U CN205654878U CN 205654878 U CN205654878 U CN 205654878U CN 201620362945 U CN201620362945 U CN 201620362945U CN 205654878 U CN205654878 U CN 205654878U
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- valve
- spool
- gravity compensation
- valve rod
- regulation valve
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Abstract
The utility model discloses a governing valve gravity compensation mechanism and adopt the governing valve of this gravity compensation mechanism. The governing valve include the case and with the lower valve rod that the case is connected, governing valve gravity compensation mechanism is including being used for the support the bracing piece of lower valve rod and the resilient means who is used for providing the holding power, resilient means's elasticity passes through the bracing piece supports lower valve rod and case. The case receives the support of addding gravity compensation mechanism, has reduced the effort of case to its top part to reduce its deformation and impaired possibility, further increase the life of governing valve.
Description
Technical field
This utility model relates to chemical production field, is specifically related to a kind of gravity compensation regulating valve and uses the regulation valve of this gravity compensation.
Background technology
The regulation valve that the decarbonization system of Ammonia Production device is used is an important control valve.In use, often break down, cause frequent start-stop car, cause a large amount of energy dissipation.The structure of the regulation valve of prior art one, as it is shown in figure 1, use between valve rod 1 with spool 3 and threaded, is fixed with pin 2, in order to avoid relatively rotating, the other end of valve rod 1 is fixed in valve bonnet (not shown).Finding that a few place is susceptible to the position of fault: the connection thread damage of (1) valve rod 1 to after the regulation valve strip inspection broken down, (2) pin 2 is cut off, and (3) valve rod 1 ruptures, and the damage of three above parts all can cause spool 3 to come off, and causes the accident.
The force analysis of this regulation valve is as it is shown on figure 3, during action, valve rod 1 band movable valve plug 3 slides up and down in valve seat guides.During operation, spool 3 is by three power effects, it may be assumed that the torque T of impulsive force F of fluid, impulsive force generation, the gravity G of self.
It is analyzed separately below: (1) impulsive force F
Under the effect of impulsive force F, spool 3 swings in valve seat.Owing to valve rod 1 is rigidly connected with spool 3, valve rod 1 swings therewith, produces moment of flexure.The connection screw thread position of valve rod 1 and spool 3 is weak part, and after certain time, the thread abrasion on valve rod 1 destroys, and valve rod 1 produces fatigue fracture sometimes.
(2) torque T
Under torque T effect, the pin 2 in Fig. 1 produces shear stress.Owing to media flow is uneven, little time big during shear stress, paroxysmal effect, pin 2 is gradually cut carefully, until fracture.
(3) gravity G
After the connection screw thread on valve rod 1 is impaired, at spool 1 under the effect of self gravitation G, pin 2 producing again vertical shear, spool 1 starts bob in valve seat, exacerbates the most again screw thread and the destruction of pin 1, until coming off.
Above three power exists simultaneously, exacerbates the damage of regulation valve.
Prior art two: the problem being easily damaged for regulation valve, utility model people improve targetedly, change and be rigidly connected as flexibly connecting between valve rod and spool, structure as shown in Figure 2, prior art two is on the basis of prior art one, improving in terms of three, (1) utilizes gland 4 to connect valve rod 1 and spool 3, makes gap and connects.The plush copper promoting dependence valve rod 1 of spool 3 and gland 4.The end face of the plush copper of valve rod 1 and spool 3 curved face contact, make valve rod 1 and spool 3 energy automatic centering.(2) using between gland 4 with spool 3 and threaded, screw thread is used for fixing, not by External Force Acting.(3) pin 2 acts the effect preventing spool 3 from rotating, even if disconnected, spool 3 does not comes off yet, and can continue normally to work.List of references one is asked for an interview in detailed structure and explanation: " decarbonization system regulation valve LRC 91A structure is improved ", carries " big nitrogenous fertilizer " the 4th phase the 265-266 page in 1993, does not repeats them here.
The structure of prior art two, substantially increases the service life of this regulation valve, but, the structure after this improves the most does not solves the self gravitation G of spool 1 to valve rod and the impact of valve seat construction.
Summary of the invention
In view of the foregoing defects the prior art has, problem to be solved in the utility model is to provide a kind of regulation valve gravity compensation, reduces the impact on regulation valve of the spool gravity, improves the service life of this regulation valve further.
For solving above-mentioned technical problem, this utility model provides a kind of regulation valve gravity compensation, described regulation valve includes spool and the lower valve rod being connected with described spool, described regulation valve gravity compensation includes the support bar for supporting described lower valve rod and for providing the elastic device of support force, and the elastic force of described elastic device is by lower valve rod and spool described in described they sup-port.
Preferably, described support force is 2～3 times of spool gravity.
One of preferably, described elastic device is cylinder piston mechanism, and described support bar is the piston rod of cylinder, the compressed air in described cylinder provide support force.Further, described cylinder bottom is provided with air-filled pore and/or air vent.
One of preferably, described elastic device is hydraulic piston mechanism, and described support bar is the piston rod of hydraulic cylinder, hydraulic oil provide support force.Further, being provided with relief valve bottom described hydraulic cylinder, described relief valve is connected with oil storage tank by pipeline.
One of preferably, described elastic device is spring, and described support bar is arranged at above spring.
This utility model additionally provides a kind of regulation valve, including spool and the lower valve rod that is connected with this spool, its improvement is, the lower end of described lower valve rod is provided with any one regulation valve gravity compensation as above, and thereby compensating for mechanism can be with the gravity of balance valve core (the most also including valve rod and other connectors) self.
As preferably, described lower valve rod is connected with spool by screw thread, and the lower end of described lower valve rod is stretched out outside valve seat, by stuffing-box and valve base sealing.Connect for convenience, as preferably, be connected by adpting flange between the lower end of lower valve rod with described support bar.
This utility model is by the gravity compensation set up, spool is made to be supported by this gravity compensation, decrease the spool active force to the upper part including upper valve rod, thus reduce its deformation and impaired possibility, heighten the service life of regulation valve further.
Accompanying drawing explanation
Fig. 1 is the regulating valve structure schematic diagram of prior art one；
Fig. 2 is the regulating valve structure schematic diagram of prior art two；
Fig. 3 is that the stressing conditions of regulation valve analyzes schematic diagram；
Fig. 4 is regulation valve gravity compensation and the structural representation of regulation valve of an embodiment of the present utility model；
Fig. 5 is the enlarged diagram of the part A in Fig. 4.
Detailed description of the invention
With specific embodiment, this utility model is described in further detail below in conjunction with the accompanying drawings, but not as to restriction of the present utility model.
As shown in Figure 4, the regulation valve of an embodiment of the present utility model, including spool 3 and the lower valve rod 25 that is connected with this spool 3, the lower end of described lower valve rod 25 is connected with regulation valve gravity compensation.Described regulation valve gravity compensation includes the support bar for being connected with described lower valve rod 25, and for providing the elastic device of support force, the elastic force of described elastic device is by lower valve rod 25 described in described they sup-port and spool 3.2～3 times of the gravity that support force is spool 3 of regulation valve gravity compensation, this numerical value gets final product the gravity (the most also including the gravity of valve rod and other connectors) of balance valve core 3, can provide again the most unnecessary support force.Spool 3 is supported by this gravity compensation, decrease spool 3 and upper valve rod 20(upper valve rod 20 be i.e. connected to the valve rod above spool 3) active force, decrease the active force to miscellaneous part, thus reduce its deformation and impaired possibility, heighten the service life of regulation valve further.
Concrete as shown in Figure 4, elastic device uses cylinder piston mechanism, and described support bar is the piston rod 61 of cylinder 6 in the present embodiment, by the compressed air offer support force in cylinder 6.For the ease of connecting, it is attached by adpting flange 27 between piston rod 61 and lower valve rod 25.The bottom of cylinder 6 is filled with compressed air, compressed air provides support force upwards by piston 62, piston rod 61, owing to gas is compressible, so support force can change within the specific limits, concrete gas pressure intensity size, is determined with the gravity size needing the spool 3 supported according to the area of piston 62.In the ordinary course of things, due to gas, there is good compressibility, it is not necessary to be adjusted the balance that i.e. can reach on vertical direction.For the ease of adjusting, the lower end of cylinder 6 is provided with pore 63, when needed, valve thereon is opened the most inflatable or venting, thus adjust the amount of the gas in cylinder, pore 63 may act as pore or air vent, it is also possible to is respectively provided with air-filled pore and air vent, it is clear that should be provided with corresponding valve on pore 63.
As shown in Figure 4, preferably, lower valve rod 25 is connected with spool 3 by screw thread, and the lower end of described lower valve rod 25 is stretched out outside valve seat, is sealed with valve seat 7 by stuffing-box 26.Lower valve rod 25 can also fixing with spool 3 by other means be connected.
In the embodiment shown in fig. 4, cylinder piston mechanism is used also to realize providing support force to be upwards mainly the weight of spool 3 to support spool 3(, certainly also include, the weight of lower valve rod and the weight of connector), the advantage using cylinder is, cylinder takes air as medium, and easy to use and pollution-free, compressibility is good.When needed, air it is directly placed into during pressure release, it is not necessary to special parts are set for accommodating medium.
Obviously, with cylinder piston mechanism similarly, described elastic device can also be hydraulic piston mechanism, and described support bar is the piston rod of hydraulic cylinder, hydraulic oil provide support force.According to the difference of practical situation, can in hydraulic cylinder charged pressure oil or be filled with the oil of normal pressure, hydraulic oil deformation produces pressure and acts on piston, thus is communicated up support force by piston rod.Similarly, hydraulic coupling is also to have certain elasticity, can be that spool offer effectively supports protection.Being provided with relief valve bottom hydraulic cylinder, described relief valve is connected with oil storage tank by pipeline.In the case of using hydraulic oil as medium, if being filled with normal pressure oil in hydraulic cylinder, oil-in can not be separately provided, utilize the deformation after the stress of hydraulic oil to produce elastic force.When charged pressure oil, can arrange oil-in, by oil-in, pressure oil is filled with hydraulic cylinder, to provide support force, it is clear that the valve that should arrange necessity in oil circuit controls, this is the conventional setting of hydraulic system, repeats no more.With take air as compared with medium, take hydraulic oil disadvantageously, need to carry oil storage tank for hydraulic oil, it is provided that special pipeline, in the case of a leak, pollute environment.Owing to the compressibility of liquid is less than gas, therefore in the case of using hydraulic pressure, in addition it is also necessary to arrange the pipeline for pressure release and parts.
In addition to taking above-mentioned cylinder or hydraulic cylinder to produce the support force of elasticity, it is also possible to using spring, support bar is fixedly installed on above spring, provide support force by the deformation of spring.In the vertical direction, is provided support force by spring.Under this situation, using spring to replace cylinder piston mechanism, can provide support force equally, play the effect compensating gravity, simply spring does not has cylinder piston mechanism the most convenient.
Obviously, as long as the elastic device of support force can be provided all can to use for lower valve rod and spool, however it is not limited to the cylinder piston mechanism cited by this specification, hydraulic piston mechanism.
In addition, incorporated by reference to Fig. 4 and Fig. 5 illustrate in the present embodiment regulation valve top situation is set, identical structure is taked with prior art two in the top of the regulation valve in the present embodiment, wherein the top of spool 3 connects the valve rod in upper valve rod 20(i.e. prior art two), connect upper valve rod 20 and spool 3 by gland 4, be allowed to connect into gap.The plush copper promoting dependence upper valve rod 20 of spool 3 and gland 4, specifically refer to document one, do not repeat them here.As shown in Figure 4 and Figure 5, being provided with guide pin bushing 23 between gland 4 and valve seat 7, sealed by filler 22 between upper valve rod 20 top and valve seat 7, the upper end of upper valve rod 20 is connected with actuator by valve block 21, to operate valve.This superstructure is identical with prior art two, by changing the attachment structure between upper valve rod 20 and spool 3, reduces the impact on valve rod (i.e. upper valve rod 20 in Fig. 5) of impulsive force.Obviously, use the upper valve rod of regulation valve of regulation valve gravity compensation of the present utility model might not take the structure shown in Fig. 4 with the connection of valve seat, take any mounting structure of the prior art the most permissible.
Certainly, the above is preferred implementation of the present utility model, it should be pointed out that; for those skilled in the art; on the premise of without departing from this utility model principle, it is also possible to make some improvements and modifications, these improvements and modifications are also considered as protection domain of the present utility model.
Claims (9)
1. a regulation valve gravity compensation, described regulation valve includes spool and the lower valve rod being connected with described spool, it is characterized in that, described regulation valve gravity compensation includes the support bar for supporting described lower valve rod and for providing the elastic device of support force, and the elastic force of described elastic device is by lower valve rod and spool described in described they sup-port.
Regulation valve gravity compensation the most according to claim 1, it is characterised in that described elastic device is cylinder piston mechanism, described support bar is the piston rod of cylinder, the compressed air in described cylinder provide support force.
Regulation valve gravity compensation the most according to claim 1, it is characterised in that described elastic device is hydraulic piston mechanism, described support bar is the piston rod of hydraulic cylinder, hydraulic oil provide support force.
Regulation valve gravity compensation the most according to claim 1, it is characterised in that described elastic device is spring, described support bar is arranged at above spring.
Regulation valve gravity compensation the most according to claim 2, it is characterised in that described cylinder bottom is provided with air-filled pore and/or air vent.
Regulation valve gravity compensation the most according to claim 3, it is characterised in that be provided with relief valve bottom described hydraulic cylinder, described relief valve is connected with oil storage tank by pipeline.
7. a regulation valve, including spool and the lower valve rod that is connected with this spool, it is characterised in that the lower end of described lower valve rod is connected with the regulation valve gravity compensation described in any one of claim 1-6.
Regulation valve the most according to claim 7, it is characterised in that described lower valve rod is connected with spool by screw thread, and the lower end of described lower valve rod is stretched out outside valve seat, by stuffing-box and valve base sealing.
Regulation valve the most according to claim 7, it is characterised in that be connected by adpting flange between the lower end of described lower valve rod with described support bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620362945.2U CN205654878U (en) | 2016-04-27 | 2016-04-27 | Gravity compensation mechanism and governing valve of governing valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620362945.2U CN205654878U (en) | 2016-04-27 | 2016-04-27 | Gravity compensation mechanism and governing valve of governing valve |
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| CN205654878U true CN205654878U (en) | 2016-10-19 |
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| CN201620362945.2U Active CN205654878U (en) | 2016-04-27 | 2016-04-27 | Gravity compensation mechanism and governing valve of governing valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105805320A (en) * | 2016-04-27 | 2016-07-27 | 北方华锦化学工业集团有限公司 | Regulating valve gravity compensation mechanism and regulating valve |
-
2016
- 2016-04-27 CN CN201620362945.2U patent/CN205654878U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105805320A (en) * | 2016-04-27 | 2016-07-27 | 北方华锦化学工业集团有限公司 | Regulating valve gravity compensation mechanism and regulating valve |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180515 Address after: 124021 Hongqi Street, Shuangtaizi District, Panjin, Liaoning Patentee after: Northern Huajin Formosan Union Chemical Corporation Address before: 124021 Hongqi Street, Shuangtaizi District, Panjin, Liaoning 482 Patentee before: North Hua Jin Chemical Industry Group Co., Ltd |
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| TR01 | Transfer of patent right |