CN215059945U - Actuator of thermal valve - Google Patents

Abstract

The utility model discloses a thermal valve actuator, which comprises a shell and a switch valve, wherein an operation assembly and a driving assembly are arranged in the shell, the operation assembly comprises an operation wheel, a first sliding part and a second sliding part, the driving assembly comprises a first wax motor and a second wax motor, the first sliding part is driven to move when the first wax motor is electrified and started, and the operation wheel is driven to rotate in the positive direction to open the switch valve; the second sliding part is driven to move when the second wax motor is electrified and started, and the operating wheel is driven to rotate reversely to close the switch valve, so that the first wax motor and the second wax motor are started in a reciprocating and alternating mode, the opening and closing operation of the switch valve is realized, and the design has the advantages that after the switch valve is opened or closed, the starting or closing state can be kept for a long time without the participation of the first wax motor and the second wax motor, so that the first wax motor or the second wax motor is prevented from being in an electrified and heated state for a long time, the whole structure is simple, the power consumption of the product is small, and the service life is long.

Description

Actuator of thermal valve

Technical Field

The utility model relates to an executor technical field, concretely relates to thermal valve executor.

Background

The actuator is an essential important component of an automatic control system. The actuator can be divided into pneumatic, hydraulic and electric according to its energy form.

Chinese patent document CN108426076A discloses a ball valve electric actuator, which comprises an outer shell, the inner chamber left side of shell is provided with the spring, the rack is installed on the right side of spring, the right side of rack is provided with temperature-sensing element, temperature-sensing element's outer wall has cup jointed the PTC heating plate, be connected with the electric wire on the PTC heating plate, the rear surface meshing of rack is connected with the gear, and the top of shell is provided with the handle, the driving medium is installed to the bottom of handle, the inner chamber at the gear is installed to the bottom of driving medium, the bottom of shell is connected with the valve body through the colored cap, the bottom of rack is passed through the transfer line and is connected with the disk seat of valve body inner chamber.

However, the ball valve electric actuator has the following problems in practical use:

1, when the PTC heating plate is electrified, the temperature sensing element is heated to extend and push the rack, the rack is moved to extrude the spring and drive the gear to rotate, the gear drives the transmission rod to rotate to open the ball valve, and when the PTC heating plate is powered off, the spring pushes the rack to reset to close the ball valve, the structure arrangement leads to the fact that when the ball valve is opened, the electrified state of the PTC heating plate needs to be kept for a long time, thereby ensuring that the temperature sensing element can be continuously heated and extend to push the rack, meanwhile, when the temperature sensing element works, the rack is pushed to extrude the spring, the rotating torque force of the ball valve needs to be overcome, so that the high-power PTC heating plate needs to be used, the output driving force of a product is increased, the power consumption of the product is large when the product works, the use cost of a user is high, and the PTC heating plate is electrified for a long time to use, and the loss rate is high, resulting in a shorter product life.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the ball valve electric actuator among the prior art and need keep the heating state of PTC hot plate for a long time when opening the valve, leads to product power consumption big, problem that life is short to it is simple to provide an open the valve, need not to add the wax motor for a long time, and product power consumption is little, long service life's thermal valve executor.

The utility model provides a thermal valve executor, including the casing, and wear out casing connection switch valve's action bars, the action bars is used for control opening and closing of switch valve, still be equipped with in the casing:

the operating assembly comprises an operating wheel which is sleeved on the operating rod in a linkage manner, and a first sliding part and a second sliding part which are symmetrically arranged at two sides of the operating wheel relative to the center of the operating wheel, the first sliding part and the second sliding part form linkage matching which moves in opposite directions in the shell through the operating wheel, and the operating wheel is driven by the first sliding part or the second sliding part to rotate in the forward direction or in the reverse direction;

the driving assembly comprises a first wax motor connected with the first sliding piece and a second wax motor connected with the second sliding piece, the first wax motor and the second wax motor are alternately in an electrified starting state, the first sliding piece is driven by the first wax motor to move in a single direction and drive the operating wheel to rotate in the positive direction, and then the operating rod is driven to control the opening and closing of the switch valve; the second sliding piece is driven by the second wax motor to move in a single direction and drive the operating wheel to rotate in the reverse direction, and then the operating rod is driven to control the on-off valve to be closed.

In the above thermal valve actuator, the first wax motor and the second wax motor respectively have two driving rods for driving the first slider and the second slider to move in one direction, the first wax motor and the second wax motor are disposed in parallel and opposite to each other in the housing, and the first slider and the second slider respectively move in opposite directions in parallel along the axial direction of the driving rods.

In the above thermal valve actuator, the first slider and the second slider are connected to the two driving rods through a transmission structure, the transmission structure includes a first transmission rod disposed between the driving rod of the first wax motor and the first slider, and a second transmission rod disposed between the driving rod of the second wax motor and the second slider, an elastic member is disposed between the first transmission rod and the second transmission rod, and the elastic member applies an elastic force to the first transmission rod or the second transmission rod to drive the driving rod to perform a reset motion when the first wax motor or the second wax motor is in a power-off stop state.

In the above thermal valve actuator, the casing includes a first mounting cavity for accommodating the operating assembly, a second mounting cavity for accommodating the driving assembly and the transmission structure, and a partition plate disposed between the first mounting cavity and the second mounting cavity, the first transmission rod and the second transmission rod are disposed between the first mounting cavity and the second mounting cavity along the axial extension of the driving rod, and two through holes for the first transmission rod and the second transmission rod to pass through are respectively disposed on the partition plate.

In the above thermal valve actuator, the elastic member is a torsion spring disposed between the first transmission rod and the second transmission rod, the first transmission rod and the second transmission rod are respectively provided with two limiting grooves having openings facing the first sliding member and the second sliding member, and two torsion spring legs of the torsion spring extend and are respectively engaged with the two limiting grooves.

In foretell thermal valve executor, be equipped with in the casing and be located first transfer line with mounting groove between the second transfer line, the center of mounting groove is equipped with the reference column, the torsional spring cover is established on the reference column, the torsional spring receives first transfer line or second transfer line drive winds the reference column is in rotatable certain angle in the mounting groove.

In the above thermal valve actuator, the elastic member is a first spring and a second spring respectively sleeved on the first transmission rod and the second transmission rod, the first transmission rod and the second transmission rod are respectively provided with an annular boss, and two ends of the first spring and the second spring respectively abut against the annular boss and the partition plate.

In the above thermal valve actuator, the operating wheel is a gear sleeved on the operating rod, the first sliding member and the second sliding member are rack structures engaged with the gear, and the first sliding member and the first transmission rod, and the second sliding member and the second transmission rod are respectively connected in the axial direction of the driving rod.

In the above thermal valve actuator, a guide structure is disposed between each of the first slider and the second slider and the housing to guide a moving direction of each of the first slider and the second slider, the guide structure includes a guide sliding groove disposed in the first mounting cavity along the moving direction of the first slider or the second slider, and a guide protruding strip disposed on each of the first slider or the second slider corresponding to the guide sliding groove, and the guide protruding strip slides along the guide sliding groove when the first slider or the second slider moves.

In the above thermal valve actuator, the drive assembly further includes a control circuit board for controlling the first wax motor and the second wax motor to be turned on or off, and the control circuit board is fixed to the outer side of the casing by bolts.

In the above thermal valve actuator, a protective casing covering the casing and the control circuit board is arranged outside the casing, and an operating handle connected with one end of the operating rod is arranged on the protective casing.

Compared with the prior art, the technical scheme of the utility model have the following advantage:

1. the utility model provides a thermal valve actuator, because first wax motor and second wax motor are the circular telegram start in turn, drive first slider when the circular telegram of first wax motor starts and move towards the direction of keeping away from first wax motor, and drive the operating wheel does forward rotation, the control lever is along with the opening of operating wheel forward rotation time control ooff valve, and the operating wheel can drive the second slider in the forward rotation process and move towards being close to second wax motor direction simultaneously, makes preparation for the closing motion of follow-up ooff valve; when the second wax motor is electrified and started, the second sliding piece is driven to move in a direction away from the second wax motor and drives the operating wheel to rotate reversely, the operating rod controls the closing of the switch valve when rotating reversely along with the operating wheel, meanwhile, the operating wheel drives the first sliding piece to move in a direction close to the first wax motor during the reverse rotation, and the switch valve is reciprocated and alternately operated, so that the electric opening and closing operation of the switch valve is realized, the design has the advantage that the opening and closing of the switch valve are realized by switching the electrified states of the first wax motor and the second wax motor, and after the opening or closing of the switch valve is finished, the switch valve can keep the starting or closing state for a long time without the participation of the first wax motor and the second wax motor, namely, the first wax motor and the second wax motor are electrified for a certain time, the power-off processing can be carried out when the switch valve is opened or closed, so that the problem that the power consumption of a product is high due to the fact that the first wax motor or the second wax motor is in an electrified heating state for a long time is solved, the whole structure is simple, the power consumption of the product is low, and the service life is long.

2. The utility model provides a thermal valve executor uses the benefit of wax motor to lie in, and the wax motor does not have traditional motor pivoted noise at the course of the work, and the wax motor drives through inside expend with heat and contract with cold the actuating lever stretches out outside the motor casing, and it does not have traditional electric motor rotor rotational wear problem, product long service life stretching out the in-process.

3. The thermal valve actuator provided by the utility model can transmit motion resultant force between the two driving rods and the first sliding part and the second sliding part by arranging the first driving rod and the second driving rod, so as to ensure that the first wax motor and the second wax motor can reliably act on the first sliding part and the second sliding part by the thrust exerted by the driving rods, and an elastic piece is arranged between the first transmission rod and the second transmission rod, when the first wax motor or the second wax motor is powered off and stops working, the first transmission rod or the second transmission rod drives the driving rod to reset and move under the action of the elastic force of the elastic piece, and the first sliding piece and the second sliding piece are still matched and connected with the operating wheel and are positioned at the position for keeping the opening and closing valve open or closed, so that the two driving rods are separated from the first sliding piece and the second sliding piece respectively and realize automatic resetting.

4. The utility model provides a thermal valve executor, when the elastic component was the torsional spring, its two torsional spring feet difference joints were in first transfer line with the spacing inslot of second transfer line, promptly when the switch valve was opened, one of them torsional spring foot of first transfer line can be extruded makes the torsional spring atress warp, and another torsional spring foot can be right the orientation is applyed to the second transfer line the biasing force is applyed to the second transfer line, makes the second transfer line extrusion it is the action of resetting to the actuating lever drive of second wax motor, ensures can be through the opposite end during the one end pressurized of torsional spring first transfer line or the orientation is applyed to the second transfer line first wax motor or the biasing force that second wax motor removed, simple structure, the transmission cooperation is reliable.

5. The utility model provides a thermal valve executor, through setting up the mounting groove does the torsional spring provides the mounted position, utilizes simultaneously the reference column does the torsional spring rotates and provides the fulcrum, ensures the torsional spring can not break away from at atress pivoted in-process the mounting groove, thereby guarantees the effect that biasing force that the torsional spring produced can be reliable is in first transfer line or on the second transfer line.

6. The utility model provides a thermal valve executor, the action wheel is established for the cover gear on the action bars, first slider with the second slider be with gear engagement's rack structure, through the transmission cooperation of gear and rack structure, be heated the wax motor and support the linear motion that pushes away rack structure and make and convert the rotary motion of gear into to the rotatory opening or closing of action bars that drives the gear center the ooff valve.

7. The utility model provides a thermal valve executor, the outside of casing be equipped with wrap up its with the protective housing of control circuit board, be equipped with on the protective housing with operating handle that action bars one end links to each other, at manual operation when the switch valve is opened or is closed, because first wax motor with second wax motor is in outage stop state simultaneously, promptly operating handle drives during the action bars is rotatory, can not with first wax motor or the interference of second wax motor, the rotating resistance is little, convenient operation is reliable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a thermal valve actuator according to the present invention mounted on a switching valve;

FIG. 2 is an exploded view of the thermal valve actuator of FIG. 1 shown with the protective case and operating handle hidden;

FIG. 3 is a top view of the interior of the housing shown in FIG. 2;

FIG. 4 is a schematic view of the hidden parts of the housing shown in FIG. 3;

FIG. 5 is a schematic view of the first and second transfer levers shown in FIG. 3;

FIG. 6 is an exploded view of a second embodiment of the thermal valve actuator of FIG. 1;

FIG. 7 is a top view of the interior of the housing shown in FIG. 6;

description of reference numerals:

1-a shell; 11-a first mounting cavity; 12-a second mounting cavity; 13-a separator; 14-a through hole; 15-mounting grooves; 16-a locating post; 17-a guide chute; 18-a protective shell; 19-operating handle;

2-switching valve; 21-an operating lever;

3-operating the components; 31-an operating wheel; 32-a first slide; 33-a second slide; 34-guiding convex strips;

4-a drive assembly; 41-a first wax motor; 42-a second wax motor; 43-a drive rod; 44-control circuit board;

5-a transmission structure; 51-a first transfer lever; 52-a second transmission rod; 53-torsion spring; 54-a limit groove; 55-a first spring; 56-a second spring; 57-annular boss.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

The present embodiment is described in detail below with reference to the accompanying drawings:

the utility model provides a thermal valve executor as shown in fig. 1-7, including casing 1, and wear out casing 1 connects the action bars 21 of ooff valve 2, action bars 21 is used for control opening and closing of ooff valve 2, still be equipped with in the casing 1:

the operating assembly 3 comprises an operating wheel 31 which is sleeved on the operating rod 21 in a linkage manner, and a first sliding part 32 and a second sliding part 33 which are symmetrically arranged at two sides of the operating wheel 31 relative to the center of the operating wheel 31, the first sliding part 32 and the second sliding part 33 are in linkage fit with each other through the operating wheel 31 to move in opposite directions in the shell 1, and the operating wheel 31 is driven by the first sliding part 32 or the second sliding part 33 to rotate in a forward direction or in a reverse direction;

a driving assembly 4, including a first wax motor 41 connected to the first slider 32 and a second wax motor 42 connected to the second slider 33, where the first wax motor 41 and the second wax motor 42 are alternately in an energized starting state, that is, when the first wax motor 41 is energized and started, the second wax motor 42 is in an de-energized stop state, when the second wax motor 42 is energized and started, the first wax motor 41 is in a de-energized stop state, the first slider 32 is driven by the first wax motor 41 to move in a single direction and drive the operating wheel 31 to rotate in a forward direction, so as to drive the operating rod 21 to control the opening and closing of the on-off valve 2; the second sliding member 33 is driven by the second wax motor 42 to move in a single direction and drive the operating wheel 31 to rotate in a reverse direction, so as to drive the operating rod 21 to control the on-off valve 2 to close.

The above embodiment is a core technical solution of this embodiment, because the first wax motor 41 and the second wax motor 42 are alternately powered on, when the first wax motor 41 is powered on, the first sliding member 32 is driven to move in a direction away from the first wax motor 41, and the operating wheel 31 is driven to rotate in the forward direction, when the operating rod 21 rotates in the forward direction along with the operating wheel 31, the opening of the on-off valve 2 is controlled, and simultaneously, the operating wheel 31 drives the second sliding member 33 to move in a direction close to the second wax motor 42 in the forward direction rotation process, so as to prepare for the subsequent closing movement of the on-off valve 2; when the second wax motor 42 is powered on and started, the second sliding member 33 is driven to move away from the second wax motor 42 and drive the operating wheel 31 to rotate reversely, the operating rod 21 controls the closing of the on-off valve 2 when rotating reversely with the operating wheel 31, and the operating wheel 31 drives the first sliding member 32 to move towards the first wax motor 41 during the reverse rotation, so that the on-off valve 2 is alternately operated in a reciprocating manner, thereby realizing the electric opening and closing operation of the on-off valve 2, which is beneficial in that the opening and closing of the on-off valve 2 are realized by switching the power-on states of the first wax motor 41 and the second wax motor 42, and the on-off valve 2 can be kept in the starting or closing state for a long time without the participation of the first wax motor 41 and the second wax motor 42 after completing the opening or closing, that is, after the first wax motor 41 and the second wax motor 42 are energized for a certain period of time, it is ensured that the switch valve 2 is turned on or off to perform power-off processing, so that the problem of high power consumption of the product due to the fact that the first wax motor 41 or the second wax motor 42 is in an energized heating state for a long time is solved.

As a specific structure, the first wax motor 41 and the second wax motor 42 include a PTC heating sheet disposed at the bottom of a motor housing, a temperature sensing material disposed inside the motor housing, and a driving rod 43 penetrating the temperature sensing material, the PTC heating sheet can cause the temperature sensing material to expand when being energized, thereby pressing the driving rod 43 to extend out of the motor housing, thereby driving the first slider 32 or the second slider 33 to move in one direction, the first wax motor 41 and the second wax motor 42 are disposed side by side on one side of the housing 1, the first slider 32 and the second slider 33 are disposed on the other side of the housing 1 in parallel along the moving direction of the driving rod 43, and the first slider 32 and the second slider 33 are driven by the driving rod 43 to move in opposite directions in parallel along the axial direction thereof, the thermal valve actuator using the wax motor has the advantages that the wax motor does not have the working noise of the rotation of the traditional motor in the working process, the wax motor drives the driving rod 43 to extend out of the motor shell through the internal expansion and contraction, the problem of the rotation abrasion of the rotor of the traditional motor in the extending process is avoided, and the service life of the product is long.

Referring to fig. 2 and 6, the first slider 32 and the second slider 33 are connected with the two driving rods 43 through a transmission structure 5, the transmission structure 5 comprises a first transmission rod 51 arranged between the driving rod 43 of the first wax motor 41 and the first slider 32, and a second transmission rod 52 arranged between the driving rod 43 of the second wax motor 42 and the second slider 33, an elastic member is arranged between the first transmission rod 51 and the second transmission rod 52, and by arranging the first transmission rod 51 and the second transmission rod 52 to transmit resultant motion force between the two driving rods 43 and the first slider 32 and the second slider 33, the first wax motor 41 and the second wax motor 42 are ensured to reliably act on the first slider 32 and the second slider 33 through the pushing force exerted by the driving rod 43, and, by providing an elastic member between the first transmission rod 51 and the second transmission rod 52, after the first wax motor 41 or the second wax motor 42 is powered off and stops working, the first transmission rod 51 or the second transmission rod 52 drives the driving rod 43 to move in a resetting manner under the elastic force of the elastic member, and the first slider 32 and the second slider 33 are still connected with the operating wheel 31 in a matching manner to be in a position for keeping the switch valve 2 open or closed, so that the two driving rods 43 are separated from the first slider 32 and the second slider 33 respectively and realize automatic resetting.

Further arranged, the casing 1 includes an accommodating portion for accommodating the first installation cavity 11 of the operation assembly 3 and accommodating portion for accommodating the driving assembly 4 and the second installation cavity 12 of the transmission structure 5, and a partition plate 13 disposed between the first installation cavity 11 and the second installation cavity 12, the first transmission rod 51 and the second transmission rod 52 are arranged between the first installation cavity 11 and the second installation cavity 12 along the axial extension of the driving rod 43, two through holes 14 are respectively formed in the partition plate 13 for allowing the first transmission rod 51 and the second transmission rod 52 to pass through, and the through holes 14 are used for realizing the quick installation and positioning of the first transmission rod 51 and the second transmission rod 52 and guiding the moving direction of the first transmission rod and the second transmission rod 52.

As a specific structural arrangement, the elastic member is a torsion spring 53 disposed between the first transmission rod 51 and the second transmission rod 52, as shown in fig. 5, the first transmission rod 51 and the second transmission rod 52 are respectively provided with a limiting groove 54 having an opening facing the first sliding member 32 or the second sliding member 33, two legs of the torsion spring 53 are respectively extended and clamped in the two limiting grooves 54, a protruding block is disposed in the limiting groove 54, the two legs of the torsion spring 53 are correspondingly provided with a bending portion hooked with the protruding block, so as to ensure that the two legs of the torsion spring 53 are not easily separated from the limiting groove 54, when the switch valve 2 is opened by setting the opening direction of the limiting groove 54, the first transmission rod 51 extrudes one leg of the torsion springs 53 to deform the torsion spring 53, and the other leg of the torsion spring 53 applies a biasing force to the second transmission rod 52, the second transmission rod 52 is made to extrude the driving rod 43 of the second wax motor 42 to drive the second wax motor to perform a resetting action, so that when one end of the torsion spring 53 is pressed, a biasing force towards the first wax motor 41 or the second wax motor 42 is applied to the first transmission rod 51 or the second transmission rod 52 through the other end, the structure is simple, the transmission matching is reliable, the arrangement is further improved, an installation groove 15 positioned between the first transmission rod 51 and the second transmission rod 52 is arranged in the shell 1 to provide an installation position for the torsion spring 53, a positioning column 16 is arranged in the center of the installation groove 15, the torsion spring 53 is sleeved on the positioning column 16, the torsion spring 53 is driven by the first transmission rod 51 or the second transmission rod 52 to rotate for a certain angle around the positioning column 16 in the installation groove 15, and the positioning column 16 can ensure that the torsion spring 53 can be quickly positioned and installed, and a pivot can be provided for the rotation of the torsion spring 53, so that the torsion spring 53 is ensured not to be separated from the installation groove 15 of the torsion spring 53 in the process of stressed rotation, and the biasing force generated by the torsion spring 53 can reliably act on the first transmission rod 51 or the second transmission rod 52.

As an alternative to the above embodiment, the elastic members are a first spring 55 and a second spring 56 respectively sleeved on the first transmission rod 51 and the second transmission rod 52, the first transmission rod 51 and the second transmission rod 52 are respectively provided with an annular boss 57, both ends of the first spring 55 and the second spring 56 abut on the annular boss 57 and the partition plate 13 respectively, the annular projection 57 changes a distance from the partition 13 when moving along with the first driving lever 51 or the second driving lever 52, thereby pressing the first spring 55 or the second spring 56 to be deformed, and when the first spring 55 or the second spring 56 is elastically restored, the elastic force drives the first transmission rod 51 or the second transmission rod 52 to drive the driving rod 43 of the first wax motor 41 or the second wax motor 42 to move in a resetting manner.

As shown in fig. 3 and 7, the operating wheel 31 is a gear sleeved on the operating rod 21, the first sliding member 32 and the second sliding member 33 are rack structures engaged with the gear, and through transmission cooperation of the gear and the rack structures, linear motion of a wax motor heated to push against the rack structures is converted into rotary motion of the gear so as to drive the operating rod 21 at the center of the gear to rotate, so as to open or close the switch valve 2, and the first sliding member 32 and the first transmission rod 51, and the second sliding member 33 and the second transmission rod 52 are respectively connected in the axial direction of the driving rod 43, so that the structure is simple and the installation is convenient.

In order to guide the moving direction of the first sliding part 32 and the second sliding part 33 moving in the housing 1, a guiding structure is respectively arranged between the first sliding part 32 and the second sliding part 33 and the housing 1, the guiding structure comprises a guiding sliding groove 17 arranged in the first installation cavity 11 along the moving direction of the first sliding part 32 or the second sliding part 33, and a guiding convex strip 34 respectively arranged on the first sliding part 32 or the second sliding part 33 corresponding to the guiding sliding groove 17, because the guiding sliding groove 17 is arranged on the upper side and the lower side of the inner wall of the first installation cavity 11, the guiding convex strip 34 is arranged on the upper side and the lower side of the first sliding part 32 and the second sliding part 33, when the first sliding part 32 or the second sliding part 33 moves, the guiding convex strips 34 on the upper side and the lower side respectively slide along the guiding sliding grooves 17 on the upper side and the lower side, thereby increasing the reliability of the sliding of the first sliding part 32 and the second sliding part 33, the problem of slip deflection is avoided, and the two are in reliable transmission fit with the operating wheel 31.

As a specific structure, the driving assembly 4 further includes a control circuit board 44 for controlling the first wax motor 41 and the second wax motor 42 to be powered on or powered off, the control circuit board 44 is fixed on the outer side of the casing 1 through bolts, and sends a signal to the control circuit board 44 when an open or close switch is pressed externally, the control circuit board 44 powers on the first wax motor 41 or the second wax motor 42 according to an actual signal, and powers off the first wax motor 41 or the second wax motor 42 after the power is turned on for a certain period of time, that is, after the switch valve 2 is completely opened or closed, so as to reduce the power consumption of the product and prolong the service life of the product.

As shown in fig. 1, a protective casing 18 is disposed outside the housing 1 and covers the housing and the control circuit board 44 to provide waterproof and dustproof functions, an operating handle 19 connected to one end of the operating rod 21 is disposed on the protective casing 18, and when the switch valve 2 is manually operated to open or close, the first wax motor 41 and the second wax motor 42 are in a power-off stop state at the same time, that is, when the operating rod 21 is driven by the operating handle 19 to rotate, the first wax motor 41 or the second wax motor 42 is not interfered with each other, so that the rotation resistance is small, and the operation is convenient and reliable.

The following is a detailed description of the working process of the thermal valve actuator of the present invention for opening the switching valve 2:

when the switch valve 2 needs to be opened, an opening signal is input to the control circuit board 44 from the outside, the control circuit board 44 is electrified after receiving the opening signal, the first wax motor 41 pushes the first transmission rod 51 and the first sliding member 32 to move through the driving rod 43, the first sliding member 32 drives the operating wheel 31 to rotate in the forward direction to open the switch valve 2, at this time, the first sliding member 32 and the operating wheel 31 keep the switch valve 2 in an open state through the cooperation of the gear structures, and after the switch valve 2 is opened, the control circuit board 44 does not supply power to the first wax motor 41 any more, after the first wax motor 41 is powered off, the elastic member is elastically reset to drive the first transmission rod 51 to press the driving rod 43, so that the driving rod 43 is reset, and the first wax motor 41 and the first sliding member 32 are separated from each other, the subsequent operation of manually or automatically closing the on-off valve 2 is facilitated, and the closing resistance is reduced.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (11)

1. A thermal valve actuator comprising a housing (1), and an operating rod (21) extending through the housing (1) and connected to a switching valve (2), the operating rod (21) being adapted to control the opening and closing of the switching valve (2), characterized in that the housing (1) further comprises:

the operating assembly (3) comprises an operating wheel (31) which is sleeved on the operating rod (21) in a linkage manner, and a first sliding piece (32) and a second sliding piece (33) which are symmetrically arranged on two sides of the operating wheel (31) relative to the center of the operating wheel (31), the first sliding piece (32) and the second sliding piece (33) are in linkage fit with each other in a manner of moving in opposite directions in the shell (1) through the operating wheel (31), and the operating wheel (31) is driven by the first sliding piece (32) or the second sliding piece (33) to rotate in the forward direction or in the reverse direction;

the driving assembly (4) comprises a first wax motor (41) connected with the first sliding piece (32) and a second wax motor (42) connected with the second sliding piece (33), the first wax motor (41) and the second wax motor (42) are alternately in an electrified starting state, the first sliding piece (32) is driven by the first wax motor (41) to move in a single direction and drive the operating wheel (31) to rotate in the forward direction, and then the operating rod (21) is driven to control the opening and closing of the switch valve (2); the second sliding piece (33) is driven by the second wax motor (42) to move in a single direction and drive the operating wheel (31) to rotate in the reverse direction, and then the operating rod (21) is driven to control the on-off valve (2) to be closed.

2. A thermal valve actuator according to claim 1 wherein the first wax motor (41) and the second wax motor (42) each have two drive rods (43) for driving the first slider (32) and the second slider (33) in one direction, the first wax motor (41) and the second wax motor (42) being disposed in parallel and opposite to each other in the housing (1), and the first slider (32) and the second slider (33) being moved in anti-parallel directions in the axial direction of the drive rods (43).

3. A thermal valve actuator according to claim 2, wherein: the first sliding piece (32) and the second sliding piece (33) are connected with the two driving rods (43) through a transmission structure (5), the transmission structure (5) comprises: a first transmission lever (51) provided between the drive lever (43) of the first wax motor (41) and the first slider (32), and a second transmission lever (52) provided between the drive lever (43) of the second wax motor (42) and the second slider (33), an elastic piece is arranged between the first transmission rod (51) and the second transmission rod (52), the elastic member is in a power-off stop state when the first wax motor (41) or the second wax motor (42) is in a power-off stop state, and applying elastic force for driving the driving rod (43) to do reset motion to the first driving rod (51) or the second driving rod (52).

4. A thermal valve actuator according to claim 3, wherein the housing (1) includes a first mounting cavity (11) for receiving the operating assembly (3), a second mounting cavity (12) for receiving the driving assembly (4), and a partition (13) disposed between the first mounting cavity (11) and the second mounting cavity (12), the first transmission rod (51) and the second transmission rod (52) extend through the first mounting cavity (11) and the second mounting cavity (12) along the axial direction of the driving rod (43), and the partition (13) is provided with two through holes (14) for passing the first transmission rod (51) and the second transmission rod (52) therethrough.

5. A thermal valve actuator according to claim 4, wherein the resilient member is a torsion spring (53) disposed between the first transmission rod (51) and the second transmission rod (52), the first transmission rod (51) and the second transmission rod (52) are respectively provided with two retaining grooves (54) opening toward the first slider (32) and the second slider (33), and two torsion spring legs of the torsion spring (53) respectively extend to be engaged in the two retaining grooves (54).

6. A thermal valve actuator according to claim 5, wherein a mounting groove (15) is formed in the housing (1) and located between the first transmission rod (51) and the second transmission rod (52), a positioning post (16) is disposed at the center of the mounting groove (15), the torsion spring (53) is sleeved on the positioning post (16), and the torsion spring (53) is driven by the first transmission rod (51) or the second transmission rod (52) to rotate around the positioning post (16) in the mounting groove (15) at a certain angle.

7. A thermal valve actuator according to claim 4, wherein the elastic member is a first spring (55) and a second spring (56) respectively fitted over the first driving lever (51) and the second driving lever (52), the first driving lever (51) and the second driving lever (52) are respectively provided with an annular boss (57), and both ends of the first spring (55) and the second spring (56) respectively abut against the annular boss (57) and the partition plate (13).

8. A thermal valve actuator according to any one of claims 4 to 7 wherein the operating wheel (31) is a gear fitted over the operating rod (21), the first slider (32) and the second slider (33) are rack gears engaged with the gear, and the first slider (32) and the first transmission rod (51) and the second slider (33) and the second transmission rod (52) are respectively provided in association with each other in the axial direction of the driving rod (43).

9. A thermal valve actuator according to claim 8, wherein guide means are provided between the first slider (32) and the second slider (33) and the housing (1) for guiding the movement direction of the first slider (32) and the second slider (33), respectively, the guide means comprising a guide runner (17) provided in the first mounting chamber (11) in the movement direction of the first slider (32) or the second slider (33), and a guide rib (34) provided on the first slider (32) or the second slider (33), respectively, in correspondence with the guide runner (17), the guide rib (34) sliding along the guide runner (17) when the first slider (32) or the second slider (33) moves.

10. A thermal valve actuator according to claim 9 wherein the drive assembly (4) further includes a control circuit board (44) for controlling the first wax motor (41) and the second wax motor (42) to be energized and de-energized, the control circuit board (44) being bolted to the outside of the housing (1).

11. A thermal valve actuator according to claim 10 wherein the casing (1) is externally provided with a protective case (18) surrounding the control circuit board (44), the protective case (18) being provided with an operating handle (19) connected to one end of the operating rod (21).

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