Cold-resistant electric actuator

Abstract

The utility model discloses a cold-resistant electric actuator. The cold-resistant electric actuator comprises an electric actuator body, an output shaft, a downward extending body, a shaft, a heat preservation cavity, an annular heat conduction plate, an operation area, an operation ring body, an inner cavity, a communication inner channel, a first inner hole and a second inner hole. Compared with the prior art, the electric actuator has the advantages that warm air can be injected into the actuator, heat is effectively transmitted to the valve rod through the output shaft of the actuator body, and therefore the valve rod can still rotate normally in the low-temperature environment, the performance and reliability of the electric actuator under the low-temperature condition are improved, and the electric actuator has good application prospects.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric actuator field, especially a kind of cold-resistant electric actuator. BACKGROUND

[0002] In modern industrial field, electric actuator is widely used in valve control field as the key component in automation control system.The main function of electric actuator is to realize the opening and closing operation of valve by motor drive, to satisfy the accurate control of fluid.However, electric actuator faces many challenges in cold environment, especially in northern winter or alpine region, low temperature condition can cause valve rod freezing, liquid viscosity increases, so as to hinder the normal opening and closing of valve.

[0003] Therefore, the utility model provides a kind of cold-resistant electric actuator, can inject warm air into actuator inside, and heat is effectively transferred to valve rod by the output shaft of actuator body, so that valve rod can still rotate normally in low temperature environment.Through the above design, the performance and reliability of electric actuator under low temperature condition are improved, with good application prospect. SUMMARY

[0004] The utility model aims at providing a kind of cold-resistant electric actuator to solve the problems proposed in background art.

[0005] The above technical purpose of the utility model is realized by the following technical scheme: a kind of cold-resistant electric actuator, including electric actuator body, the electric actuator body has with the valve rod in valve and provides power for it output shaft fixed;The lower end of electric actuator body has lower extension body, the lower extension body is vertically downwards and is drawn out the shaft hole of lower extension body to the output shaft, the lower extension body is also opened and is set with heat preservation chamber, the heat preservation chamber is used to retain warm air, the heat preservation chamber is separated by ring type heat conduction plate between shaft hole, the ring type heat conduction plate and output shaft are all made of heat conduction material, to realize the heat transfer between heat preservation chamber and valve rod;

[0006] The operation area is arranged in the lower extension body, and a matched operation ring body is arranged in the operation area, and the operation ring body is rotationally connected with the lower extension body, the central part of the operation ring body is a hollow inner cavity, an annular communication channel is arranged between the inner cavity and the outer wall of the operation ring body, and the communication channel has two ports which are communicated with the outer edge of the operation area respectively; the first inner hole and the second inner hole are arranged in the lower extension body, one end of the first inner hole is communicated with the outside of the lower extension body, the other end is communicated with the operation area, one end of the second inner hole is communicated with the heat preservation chamber, and the other end is communicated with the operation area; the operation ring body locally extends out of the lower extension body for the operator to apply force and rotate; the operation ring body has a first state of mutually connecting the first inner hole and the second inner hole through the communication channel or a second state of sealing the first inner hole and the second inner hole by rotating.

[0007] Further arrangement is that two groups of self-locking members which are symmetrical to each other are arranged in the operation area, and the two groups of self-locking members are located in the inner cavity; the two groups of self-locking members each include a self-locking arm and a damping arm fixed to the outer side of the self-locking arm, the damping arm is arc-shaped to increase the contact area with the inner wall of the operation ring body; the lower end of the self-locking arm is rotationally connected with the lower extension body through a rotating shaft; a driving member is arranged in the operation area, the driving member is located in the inner cavity, and the driving member can simultaneously provide the two damping arms with power for outward rotation to press tightly against the inner wall of the operation ring body.

[0008] Further arrangement is that the driving member includes a driving inner shell, driving grooves are arranged on the left and right sides of the driving inner shell, the outer sides of the two driving grooves are slot openings, and the inner sides are groove bottoms; driving blocks are movably arranged in the two driving grooves, contact pads are fixedly arranged on the outer sides of the two driving blocks, power springs are arranged in the two driving grooves to provide the corresponding driving blocks with external moving force; force protrusions are fixedly arranged on the upper ends of the two self-locking arms, and the two force protrusions can respectively extend into the two driving grooves and abut against the corresponding contact pads.

[0009] Further arrangement is that first fixed blocks are fixedly arranged on the groove bottoms of the two driving grooves, second fixed blocks are fixedly arranged on the inner sides of the two driving blocks, and the power springs are located between the first fixed blocks and the second fixed blocks; stop blocks are fixedly arranged in the two driving grooves, and the two stop blocks are located on the outer sides of the corresponding second fixed blocks and can contact the corresponding second fixed blocks to limit.

[0010] Further arrangement is that the first fixed blocks and the second fixed blocks are respectively provided with first inner recesses and second inner recesses into which the power springs extend.

[0011] Further settings are: two said self-locking arms are fixedly provided with pulling blocks on the inner sides, and the two pulling blocks vertically extend out of the lower extension body surface; the lower extension body surface is provided with movable openings for the two pulling blocks to extend out and move.

[0012] Further settings are: the operation ring body surface is provided with an indication mark, and when the operation ring body is in the first state, the indication mark will expose the lower extension body for the operator to observe.

[0013] The utility model has the following beneficial effects:

[0014] 1. In the utility model, the output shaft of the electric actuator body is fixed with the valve rod in the valve, the temperature of the heat preservation chamber will rise after injecting warm air, the output shaft will also rise in temperature, and then the heat will be transferred to the valve rod, so that the valve rod can still rotate normally in a low temperature environment; this design can effectively adapt to various valves without heat preservation function, and make them have the condition of running in a low temperature environment. The operation ring body is provided, which can be rotated by the operator. It not only connects the first inner hole and the second inner hole to inject warm air, but also seals the first inner hole and the second inner hole to prevent the injected warm air from leaking, which is very convenient. The operation ring body will partially extend out of the lower extension body for the operator to exert force and rotate.

[0015] 2. In the utility model, the damping arms in the two groups of self-locking members can be tightly pressed against the inner wall of the operation ring body to prevent the operation ring body from rotating under external interference, and the sealing effect of the injected warm air is better.

[0016] 3. In the utility model, the driving blocks in the two driving grooves will move outwards under the power of the two power springs, and then the two contact pads will be in contact with the corresponding stress protrusions, so that the two damping arms rotate outward to press against the inner wall of the operation ring body. The contact pad can avoid hard contact.

[0017] 4. In the utility model, the two anti-dropping blocks can be in contact with the corresponding second fixed blocks to limit the position.

[0018] 5. In the utility model, the first inner recess and the second inner recess provide a buffer space for the power spring to avoid damage.

[0019] 6. In the utility model, the setting of the pulling block and the movable opening enables the operator to manually control the self-locking arm to move away from the inner wall of the operation ring body, so that the operation ring body can rotate smoothly.

[0020] 7. In the utility model, the setting of the indication mark facilitates the user to understand whether the operation ring body is in the first state of connecting the first inner hole and the second inner hole. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of the embodiment;

[0022] Figure 2 for Figure 1 enlarged view of part A in the middle;

[0023] Figure 3 for Figure 2 enlarged view of part B in the middle;

[0024] Figure 4 for schematic diagram of surface structure of operating ring body in the embodiment.

[0025] In the figure: 11, electric actuator body; 12, output shaft; 13, lower extension body; 14, shaft hole; 15, heat preservation chamber; 16, ring-shaped heat conduction plate; 21, operating area; 22, operating ring body; 221, communication inner channel; 222, inner cavity; 31, first inner hole; 32, second inner hole; 41, self-locking arm; 411, stress protrusion; 42, damping arm; 43, rotating shaft; 51, driving inner shell; 511, driving groove; 52, driving block; 53, contact pad; 54, power spring; 61, first fixed block; 611, first inner recessed groove; 62, second fixed block; 621, second inner recessed groove; 63, anti-disengagement block; 71, pulling block; 72, movable aperture; 81, indication arrow; 91, micro air pump; 92, air suction pump. DETAILED DESCRIPTION

[0026] The utility model will be made further detailed description in combination with the drawings.

[0027] As shown in the accompanying Figures 1 to 4 ;

[0028] The embodiment discloses a cold-resistant electric actuator, which comprises an electric actuator body 11, the electric actuator body 11 is provided with an output shaft 12 fixed with a valve rod in a valve and providing power for the valve rod, the electric actuator body 11 is provided with a lower extension body 13 at the lower end, the lower extension body 13 is provided with a shaft hole 14 for the output shaft 12 to vertically extend downwards out of the lower extension body 13, and the lower extension body 13 is further provided with a heat preservation chamber 15 for retaining warm air, the heat preservation chamber 15 is separated from the shaft hole 14 by a ring-shaped heat conduction plate 16, the ring-shaped heat conduction plate 16 and the output shaft 12 are both made of heat-conducting material to realize heat transfer between the heat preservation chamber 15 and the valve rod, and the material of the ring-shaped heat conduction plate 16 and the output shaft 12 is copper alloy or aluminum alloy.

[0029] An operation area 21 is formed in the lower extension body 13, and an operation ring body 22 matched with the operation area 21 is arranged in the operation area 21. The operation ring body 22 is rotationally connected with the lower extension body 13. The operation ring body 22 has a hollow inner cavity 222 in the center. An annular communication channel 221 is arranged between the inner cavity 222 and the outer wall of the operation ring body 22. The communication channel 221 has two ports respectively communicating with the outer edge of the operation area 21. A first inner hole 31 and a second inner hole 32 are formed in the lower extension body 13. One end of the first inner hole 31 communicates with the outside of the lower extension body 13, and the other end communicates with the operation area 21. One end of the second inner hole 32 communicates with the heat preservation chamber 15, and the other end communicates with the operation area 21. The operation ring body 22 partially extends out of the lower extension body 13 for the operator to apply force to rotate. The operation ring body 22 has a first state of communicating the first inner hole 31 and the second inner hole 32 through the communication channel 221, or a second state of sealing the first inner hole 31 and the second inner hole 32.

[0030] In the operation area 21, two groups of self-locking members are arranged symmetrically. Both groups of self-locking members are located in the inner cavity 222. Both groups of self-locking members include a self-locking arm 41 and a damping arm 42 fixed to the outer side of the self-locking arm 41. The damping arm 42 is arc-shaped to increase the contact area with the inner wall of the operation ring body 22. The lower end of the self-locking arm 41 is rotationally connected with the lower extension body 13 through a rotating shaft 43. A driving member is arranged in the operation area 21 and located in the inner cavity 222. The driving member can simultaneously provide power for both damping arms 42 to rotate outward to press tightly against the inner wall of the operation ring body 22.

[0031] The driving member includes a driving inner shell 51. Driving grooves 511 are formed on the left and right sides of the driving inner shell 51. The outer sides of the two driving grooves 511 are slot openings, and the inner sides are groove bottoms. Driving blocks 52 are movably arranged in the two driving grooves 511. Contact pads 53 are fixedly arranged on the outer sides of the two driving blocks 52. Power springs 54 are arranged in the two driving grooves 511 to provide external moving force for the corresponding driving blocks 52. The upper ends of the two self-locking arms 41 are fixedly provided with force protrusions 411. The two force protrusions 411 can respectively extend into the two driving grooves 511 and abut against the corresponding contact pads 53. The contact pads 53 are rubber products.

[0032] The groove bottoms of the two driving grooves 511 are fixedly provided with first fixed blocks 61. The inner sides of the two driving blocks 52 are fixedly provided with second fixed blocks 62. The power springs 54 are located between the first fixed blocks 61 and the second fixed blocks 62. Stop blocks 63 are fixedly arranged in the two driving grooves 511. The two stop blocks 63 are located on the outer side of the corresponding second fixed blocks 62 and can contact the corresponding second fixed blocks 62 to limit the position.

[0033] The first fixed block 61 and the second fixed block 62 are respectively provided with a first inner recess 611 and a second inner recess 621 into which the power spring 54 extends.

[0034] The two self-locking arms 41 are respectively provided with a pulling block 71 extending vertically out of the surface of the lower extension body 13.

[0035] The surface of the operation ring body 22 is provided with an indication mark, which is exposed out of the lower extension body 13 when the operation ring body 22 is in the first state, so as to be observed by the operator. In the embodiment, the indication mark is symmetrically arranged on the opposite sides of the operation ring body, and each side of the indication mark is composed of three indication arrows 81.

[0036] In the embodiment, the first inner hole 31 can be connected with an external pipeline, and the external pipeline can be provided with a micro air pump 91 for injecting warm air and an air pump 92 for extracting warm air.

[0037] The working principle of the embodiment is as follows:

[0038] Firstly, the operator presses the two pulling blocks 71 together, so that the two self-locking arms 41 are away from the inner wall of the operation ring body 22, and the operation ring body 22 can be rotated smoothly. Then, the operation ring body 22 is controlled to rotate, and the operation ring body 22 is in the first state of connecting the first inner hole 31 and the second inner hole 32 through the communication inner channel 221, so that the three indication arrows 81 are exposed out of the lower extension body 13, and the operator knows that the first inner hole 31 and the second inner hole 32 are connected with each other. Then, the two pulling blocks 71 are loosened, and the two damping arms 42 are tightly pressed against the inner wall of the operation ring body 22 under the pushing of the two driving blocks 52, so as to lock the operation ring body 22. Then, the external pipeline is aligned with and inserted into the first inner hole 31, and the warm air is injected into the first inner hole 31 through the micro air pump, and then enters the heat preservation chamber 15 through the communication inner channel 221 and the second inner hole 32. After the warm air is injected into the heat preservation chamber 15, the temperature of the heat preservation chamber 15 is increased, and the output shaft 12 is also increased in temperature, so that the heat is transferred to the valve rod, and the valve rod can still rotate normally in a low temperature environment. When the injection of the warm air is completed, the operator presses the two pulling blocks 71 together again, so that the operation ring body 22 can be rotated smoothly, and the operation ring body 22 is in the second state of sealing the first inner hole 31 and the second inner hole 32. At this time, the three indication arrows 81 are hidden in the lower extension body 13. Then, the two pulling blocks 71 are loosened, and the two damping arms 42 are tightly pressed against the inner wall of the operation ring body 22 under the pushing of the two driving blocks 52, so as to lock the operation ring body 22. The operation ring body 22 is prevented from rotating under the interference of the outside, and the injected warm air is effectively sealed.

[0039] The specific embodiments are only an explanation of the utility model, and are not a limitation of the utility model, and a person skilled in the art can make a modification without creative contribution according to the need after reading the specification, but as long as it is in the scope of the claims of the utility model, it is protected by the patent law.

Claims

1. A cold resistant electric actuator comprising an electric actuator body (11) having an output shaft (12) fixed to and providing power for a valve stem in a valve; characterized in that: The electric actuator body (11) has a lower extension body (13) at the lower end, the lower extension body (13) is provided with an axle hole (14) for the output shaft (12) to vertically extend downward, and a heat preservation chamber (15) is also provided in the lower extension body (13) for retaining warm air, the heat preservation chamber (15) is separated from the axle hole (14) by a ring-shaped heat conducting plate (16), and the ring-shaped heat conducting plate (16) and the output shaft (12) are both made of heat conducting material to realize heat transfer between the heat preservation chamber (15) and the valve rod. An operation area (21) is provided in the lower extension body (13), and a matching operation ring body (22) is arranged in the operation area (21), the operation ring body (22) is rotationally connected with the lower extension body (13), the operation ring body (22) has a hollow inner cavity (222) in the center, an annular communication channel (221) is arranged between the inner cavity (222) and the outer wall of the operation ring body (22), and the communication channel (221) has two ports respectively communicating with the outer edge of the operation area (21); a first inner hole (31) and a second inner hole (32) are provided in the lower extension body (13), one end of the first inner hole (31) communicates with the outside of the lower extension body (13), the other end communicates with the operation area (21), one end of the second inner hole (32) communicates with the heat preservation chamber (15), and the other end communicates with the operation area (21); the operation ring body (22) partially extends out of the lower extension body (13) for the operator to rotate and exert force; the operation ring body (22) has a first state of connecting the first inner hole (31) and the second inner hole (32) through the communication channel (221) and a second state of sealing the first inner hole (31) and the second inner hole (32) by rotating.

2. A cold-resistant electric actuator according to claim 1, characterized in that: Two groups of self-locking members are arranged in the operation area (21) and symmetrically located in the inner cavity (222); each group of self-locking members includes a self-locking arm (41) and a damping arm (42) fixed to the outer side of the self-locking arm (41), the damping arm (42) is arc-shaped to increase the contact area with the inner wall of the operation ring body (22); the lower end of the self-locking arm (41) is rotationally connected with the lower extension body (13) through a rotating shaft (43); a driving member is arranged in the operation area (21) and located in the inner cavity (222), and the driving member can simultaneously provide power for the two damping arms (42) to rotate outward to tightly press against the inner wall of the operation ring body (22).

3. A cold-resistant electric actuator according to claim 2, characterized in that: The driving member comprises a driving inner shell (51), both sides of which are provided with driving grooves (511), the outer sides of which are notched and the inner sides of which are grooved; both the driving grooves (511) are movably provided with driving blocks (52), both the driving blocks (52) are fixedly provided with contact pads (53) on the outer sides, and both the driving grooves (511) are provided with power springs (54) for providing external moving force for the corresponding driving blocks (52); both the self-locking arms (41) are fixedly provided with stress protrusions (411) on the upper ends, which can respectively extend into the driving grooves (511) and abut against the corresponding contact pads (53).

4. A cold-resistant electric actuator according to claim 3, characterized in that: Both the groove bottoms of the driving grooves (511) are fixedly provided with first fixed blocks (61), both the inner sides of the driving blocks (52) are fixedly provided with second fixed blocks (62), and the power springs (54) are located between the first fixed blocks (61) and the second fixed blocks (62); both the driving grooves (511) are fixedly provided with escape blocks (63), which are located on the outer sides of the corresponding second fixed blocks (62) and can be in contact with the corresponding second fixed blocks (62) to limit the position.

5. A cold-resistant electric actuator according to claim 4, characterized in that: The first fixed blocks (61) and the second fixed blocks (62) are respectively provided with first recessed grooves (611) and second recessed grooves (621) for the power springs (54) to extend into.

6. The cold-resistant electric actuator according to claim 2, characterized in that: Both the self-locking arms (41) are fixedly provided with pulling blocks (71) on the inner sides, both the pulling blocks (71) vertically extend out of the surface of the lower extension body (13); the surface of the lower extension body (13) is provided with movable apertures (72) for both the pulling blocks (71) to extend out and move.

7. A cold-resistant electric actuator according to claim 6, characterized in that: The surface of the operation ring body (22) is provided with an indication mark, when the operation ring body (22) is in the first state, the indication mark will be exposed out of the lower extension body (13) for the operator to observe.

Images