CN210266122U

CN210266122U - Combined type transmission

Info

Publication number: CN210266122U
Application number: CN201920302462.7U
Authority: CN
Inventors: 周长华; 吴章示
Original assignee: Shanghai Xionglian Precision Mechanism Accessory Co ltd
Current assignee: Shanghai Xionglian Precision Mechanism Accessory Co ltd
Priority date: 2019-03-11
Filing date: 2019-03-11
Publication date: 2020-04-07
Anticipated expiration: 2029-03-11

Abstract

The utility model discloses a combined type transmission, its characterized in that: the lead switching mechanism comprises a large lead transmission mechanism and a small lead transmission mechanism, and the large lead transmission mechanism and the small lead transmission mechanism can be switched by a lead switching part. The two-lead combined transmission device can reduce the operation torque force of the high-pressure section and accelerate the opening and closing speed of the low-pressure section in the opening and closing processes of the high-pressure or ultrahigh-pressure valve. So as to meet the requirements of fast opening and closing speed and small operating force of the valve. And simultaneously, the opening and closing stability and safety of the high-pressure or ultrahigh-pressure valve are further improved.

Description

Combined type transmission

Technical Field

The utility model belongs to mechanical transmission specifically says so and relates to a combined type transmission, especially has the combined type transmission of two helical pitches, and is fast when can satisfying high pressure or super high pressure valve and open and close, requirement that operating force is little.

Background

At present, a flat valve is commonly adopted in the fields of petroleum, natural gas, petrochemical industry, throttling and kill-job manifolds, oil and gas gathering and transportation control and the like to connect or cut off pipeline fluid, in the traditional flat valve, the movement of a valve plate is realized by depending on the rotation of a valve rod, the connection and the transmission of the valve rod and a valve rod nut are completed by depending on threads, the friction coefficient of the threads is large, the transmission efficiency is low, the switching moment of the valve is large, the opening and the closing of the valve are very laborious, particularly, the high-pressure valve, the ultrahigh-pressure valve and the large-caliber valve can be opened and closed by using electric power as power, but in the working environments of deserts, Gobi, tropical rainforests and the like far away from a power supply and dispersed oil wells, a proper power supply cannot be found to provide driving force for the.

In order to solve the technical dilemma that a proper power supply is difficult to be used for providing driving force for the valve under the severe environment, chinese patent ZL200920075737.4 discloses a ball screw transmission flat valve, which comprises a valve rod, an upper valve cover, a tail rod and a lower valve cover, wherein one end of the valve rod is inserted into the upper valve cover, one end of the tail rod is inserted into the lower valve cover, spring energy storage sealing rings are arranged between the valve rod and the upper valve cover and between the tail rod and the lower valve cover, and U-shaped springs are arranged in the spring energy storage sealing rings. In the patent technology, the matching surface of the valve seat and the bottom of a valve seat hole on a valve body is provided with a spring energy storage sealing structure with an inner lip and an outer lip; the lifting of the valve rod is realized through the transmission of the ball screw, the sealing performance of the valve is improved through the flat valve driven by the ball screw, and the opening and closing torque of the valve is greatly reduced.

However, with the further development of oil extraction technology, especially in the extraction process of shale oil and shale gas, the pressure to which the flat valve is subjected is further increased, and due to the requirement of extraction cost control, on the one hand, the action time of the flat valve during opening or closing is required to be sufficiently short, and on the other hand, the operating force required by the flat valve during opening and closing can be sufficiently small, which is difficult to meet the technical requirement of the ball screw driven flat valve provided in the above patent technology.

SUMMERY OF THE UTILITY MODEL

The utility model aims at exactly being difficult to realize opening on the one hand or closing the time action time short enough to above-mentioned current wafer valve, on the other hand, wafer valve required operating force can enough little technological problem when opening and closing, provides a combined type transmission who has two helical pitches, can realize that high pressure or super high pressure valve open and close fast, the less purpose of operating force.

Technical scheme

In order to realize the technical purpose, the utility model provides a combined type transmission, its characterized in that: the lead switching mechanism comprises a large lead transmission mechanism and a small lead transmission mechanism, and transmission conversion can be carried out between the large lead transmission mechanism and the small lead transmission mechanism by utilizing the lead switching part.

Further, big helical pitch drive mechanism includes long lead screw, the cover is equipped with nut lead screw composite member on the long lead screw, nut lead screw composite member can back and forth movement on the long lead screw, little helical pitch drive mechanism includes main nut, main nut suit is in can back and forth movement on the nut lead screw composite member, the one end side of nut lead screw composite member is provided with helical pitch switching part.

Further, the lead switching part is a friction clutch, the friction clutch and the nut and lead screw composite component are integrated or combined, and the long lead screw penetrates through the friction clutch and the nut and lead screw composite component.

Further, the nut and screw composite component is provided with a nut characteristic portion and a screw characteristic portion, the nut and screw composite component is sleeved on the long screw through the nut characteristic portion, and the main nut is sleeved on the nut and screw composite component through the screw characteristic portion.

Furthermore, a limiting flange is arranged at one end of the nut and lead screw composite component, which is opposite to the lead switching part.

Furthermore, the end of one end of the long lead screw is provided with a connecting part.

Furthermore, the outer circular surface of the main nut is provided with a thread or a flange or a key groove connecting part.

Preferably, the friction clutch is conical in shape.

Advantageous effects

The utility model provides a pair of combined type transmission with two helical pitches can realize that high pressure or super high pressure valve is fast opening and closing, and the valve is opened or is closed the less purpose of operation that needs. And simultaneously, the opening and closing stability and safety of the high-pressure or ultrahigh-pressure valve are further improved.

Drawings

Fig. 1 is a schematic structural diagram of the compound transmission device in the embodiment of the present invention when the high-pressure or ultrahigh-pressure valve is in the closed state.

Fig. 2 is a schematic structural diagram of the compound transmission device in the embodiment of the present invention when the high-pressure or ultrahigh-pressure valve is in the high-pressure section open state.

Fig. 3 is a schematic structural diagram of the compound transmission device in the embodiment of the present invention when the high-pressure or ultrahigh-pressure valve is in the open state.

Fig. 4 is a schematic structural diagram of the compound transmission device in the embodiment of the present invention when the high-pressure or ultrahigh-pressure valve is in the low-pressure section closed state.

Fig. 5 is a schematic structural diagram of a nut and screw composite component in an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of the main nut in the embodiment of the present invention.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Examples

In order to satisfy the needs of present high pressure valve, especially the technical purpose that super high pressure valve opens and close when closing in-process shale oil and shale gas exploitation fast, operating force is little, the utility model provides a combined type transmission, it includes big helical pitch drive mechanism and little helical pitch drive mechanism, big helical pitch drive mechanism with can utilize helical pitch switching part to carry out the transmission conversion between the little helical pitch drive mechanism, the high pressure section of opening or closing the in-process at the valve is little helical pitch drive mechanism and plays, and the low pressure section of opening or closing the in-process at the valve is big helical pitch drive mechanism and plays.

Specifically, as shown in fig. 1 to 4, in the combined type transmission device provided in this embodiment, the large lead transmission mechanism includes a long lead screw 1, a nut and lead screw composite component 2 is sleeved on the long lead screw 1, the nut and lead screw composite component 2 can make a spiral motion with the long lead screw 1, the small lead transmission mechanism includes a main nut 3, the main nut 3 is sleeved on the nut and lead screw composite component 2 and can make a spiral motion, and a lead switching portion is provided at one end side of the nut and lead screw composite component 2. In this embodiment, the lead switching unit is a friction clutch 4, preferably a cone, and the cone and the nut and screw combined component 2 are integrated or combined, and in this embodiment, the cone and the nut and screw combined component 2 are integrated. The long lead screw 1 penetrates through the cone and the nut and lead screw composite component 2.

As shown in fig. 5, the nut-screw composite component 2 is provided with a nut feature 201 and a screw feature 202, the nut-screw composite component 2 is sleeved on the long screw 1 by the nut feature 201, and the main nut 3 is sleeved on the nut-screw composite component 2 by the screw feature 202. The nut and screw composite component 2 is provided with a limiting flange 203 at one end opposite to the lead switching part, and the limiting flange can limit the spiral motion stroke with the main nut 3.

For connecting with the valve rod of the valve, a connecting part 101 is arranged on the end head of one end of the long lead screw 1.

For connecting with the nut sleeve or the nut seat of the valve, a connecting portion 301 such as a thread, a flange or a key groove is disposed on the outer circumferential surface of the main nut 3, as shown in fig. 6, in this embodiment, a thread is disposed on the outer circumferential surface of the main nut 3. As shown in the attached figure 1, when the valve is in a closed position, the nut and screw compound component 2 is arranged at the left end of the long screw 1, and a gasket 5 is arranged at the position of the shaft shoulder surface of the long screw 1 to facilitate connection with a valve rod and prevent damage to the end surface and internal parts of the nut and screw compound component 2.

When the valve needs to be opened, the nut sleeve or the nut seat of the valve drives the main nut 3 to rotate (the axial direction is restricted), and because the torque forces of the large lead transmission mechanism and the small lead transmission mechanism are different, firstly, the small lead transmission mechanism acts, and the nut lead screw composite component 2 moves leftwards until the combination of the cone and the conical hole of the main nut 3 is limited. As shown in fig. 2. At the moment, the valve is partially opened, and the pressure in the valve cavity is greatly reduced.

And then the nut and screw rod composite component 2 is driven by the main nut 3 to rotate together under the action of friction force, and the long screw rod 1 is driven to move leftwards rapidly from the surface until the valve is completely opened. As shown in fig. 3. In the whole valve opening process, the opening operating force is small in the early stage due to the fact that the torque of the small-lead transmission mechanism is small. In the later stage, the pressure in the valve cavity is greatly reduced, so that the large-lead transmission mechanism can still rapidly complete the opening of the valve with smaller operating force.

When the valve needs to be closed, the friction force generated by the combination of the cone 4 and the conical hole of the main nut 3 is larger than the torque force of the large-lead transmission mechanism, firstly, the large-lead transmission mechanism acts, and the nut and screw composite component 2 rotates along with the main nut 3. The long lead screw 1 is driven to move rightwards quickly until the gasket 5 contacts the nut and lead screw composite component 2 and then is limited. As shown in fig. 4.

And then the cone is combined with and separated from the conical hole of the main nut 3, and the nut and lead screw composite component 2 is converted into linear motion to continue moving rightwards until the valve is completely closed. As shown in figure 1. In the whole valve closing process, the pressure in the valve cavity in the early stage is small and is quickly completed by the large-lead transmission mechanism, and the pressure in the valve cavity in the later stage is large and is completed by the small-lead transmission mechanism.

The structure, ratio, size and the like shown in the drawings attached to the present embodiment are only used for matching with the disclosure of the specification, so as to be known and read by those skilled in the art, and are not used to limit the practical limit condition of the present invention, so that the present invention does not have the essential meaning in the technology, and any structure modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the function and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are considered to be the scope of the present invention without substantial changes in the technical content.

Claims

1. A compound transmission device is characterized in that: the lead switching mechanism comprises a large lead transmission mechanism and a small lead transmission mechanism, wherein the large lead transmission mechanism and the small lead transmission mechanism can perform transmission conversion by utilizing the lead switching part;

the large-lead transmission mechanism comprises a long lead screw (1), a nut and lead screw composite component (2) is sleeved on the long lead screw (1), the nut and lead screw composite component (2) can move back and forth on the long lead screw (1), the small-lead transmission mechanism comprises a main nut (3), the main nut (3) is sleeved on the nut and lead screw composite component (2) and can move back and forth, and a lead switching part is arranged on one end side of the nut and lead screw composite component (2);

the lead switching part is a friction clutch (4), the friction clutch (4) and the nut and lead screw composite component (2) are integrated or combined, and the long lead screw (1) penetrates through the friction clutch (4) and the nut and lead screw composite component (2).

2. A compound transmission as defined in claim 1, wherein: the nut and screw composite component (2) is provided with a nut characteristic part (201) and a screw characteristic part (202), the nut and screw composite component (2) is sleeved on the long screw (1) through the nut characteristic part (201), and the main nut (3) is sleeved on the nut and screw composite component (2) through the screw characteristic part (202).

3. A compound transmission as defined in claim 1, wherein: and a limiting flange (203) is arranged at one end of the nut and lead screw composite component (2) opposite to the end where the lead switching part is arranged.

4. A compound transmission as defined in claim 1, wherein: the end of one end of the long lead screw (1) is provided with a connecting part (101).

5. A compound transmission as defined in claim 1, wherein: and a thread or flange or key groove connecting part (301) is arranged on the outer circular surface of the main nut (3).

6. A compound transmission as defined in claim 1, wherein: the shape of the friction clutch (4) is a cone.