CN220102227U - High-precision low-cost thermostat - Google Patents

Abstract

The utility model discloses a high-precision low-cost thermostat, wherein a push rod is provided with an opening and closing total stroke for adjusting the flow of a control valve, the opening and closing total stroke is provided with N unit strokes Lx, the sum of the N unit strokes Lx is equal to the opening and closing total stroke, a control circuit is provided with a gear adjusting relation table, the gear adjusting relation table is provided with N unit driving times Tx seconds, the displacement of the push rod is one unit stroke Lx when a motor continuously works for one unit driving time Tx seconds, the surface of an outer shell is provided with a control interface for setting gears, the control interface is electrically connected with a control circuit, the difference value between a target gear and the gear number of the current gear is set to be M in the one-time gear adjusting process, and the control circuit receives a control signal of the control interface and controls the motor to continuously work for M X Tx seconds according to the gear adjusting relation table and then stops. Simple structure, with low costs, the temperature is controlled to the many gears, and constant temperature is effectual, automatic constant temperature, need not manual regulation, convenient to use.

Description

High-precision low-cost thermostat

Technical Field

The utility model relates to the technical field of thermostats, in particular to a high-precision low-cost thermostat.

Background

The heating system controls the flow of hot water flowing into the radiator through a thimble type flow valve so as to adjust the heating temperature, and the thimble type flow valve is different from a traditional rotary opening and closing valve, and is controlled to be opened and closed through a telescopic valve rod, and when the valve rod is slowly pressed down, the flow is reduced until the valve is gradually closed; when the valve stem is slowly released, the flow is increased until the maximum flow of the valve is reached.

In the prior art, a valve rod is driven to stretch out and draw back by a thermostat so as to control the heating temperature, the thermostat drives a push rod to move up and down by a motor through a reduction gear set so as to push against the valve rod to stretch out and draw back, the control precision of the motor on the valve rod is low, the constant temperature effect is poor, the indoor temperature is suddenly high and suddenly low along with the change of the outdoor temperature, the phenomenon of suddenly cold and suddenly hot occurs, and the experience sense is very poor; in order to solve this problem, a servo motor is generally used to solve the problem of control accuracy, but the servo motor needs to be matched with an encoder, which results in complex structure and high cost, so that improvement is needed.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide the high-precision low-cost thermostat which has the advantages of simple structure, low cost, multiple-gear temperature control, good constant temperature effect, automatic constant temperature, no need of manual adjustment and convenient use.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: a high-precision low-cost thermostat is provided with N+1 gears, the thermostat is provided with an outer shell, a control circuit, a motor, a transmission mechanism and an actuating mechanism, the control circuit, the motor, the transmission mechanism and the actuating mechanism are arranged in the inner cavity of the outer shell,

the control circuit is electrically connected with the motor, the motor is connected with the transmission mechanism in a transmission way, the transmission mechanism is connected with the actuating mechanism in a transmission way, the actuating mechanism is provided with a push rod for pushing the valve rod,

the push rod has an opening and closing total stroke for adjusting the flow of the control valve, the opening and closing total stroke is provided with N unit strokes Lx, N is a natural number larger than 1, the sum of the N unit strokes Lx is equal to the opening and closing total stroke,

the control circuit is provided with a gear adjustment relation table provided with N unit driving times Tx seconds, the displacement of the push rod is a unit stroke Lx when the motor continuously works for one unit driving time Tx seconds,

the surface of the outer shell is provided with a control interface for setting preset temperature and a temperature sensor for monitoring ambient temperature, the control interface and the temperature sensor are respectively and electrically connected with a control circuit,

in the one-time gear adjusting process, the difference value of the gear number of the target gear and the current gear is set to be M, and the control circuit receives a control signal of the control interface and controls the motor to continuously work for M multiplied by Tx seconds according to the gear adjusting relation table and then stops.

In a further technical scheme, a temperature-sensitive mounting hole is formed in the outer shell, the temperature sensor is an NTC thermistor, the NTC thermistor is mounted in the temperature-sensitive mounting hole, and the NTC thermistor is electrically connected with the control circuit.

In a further technical scheme, the control interface comprises a control panel composed of a display screen and a plurality of control keys or a touch control screen electrically connected to the control circuit, wherein the control keys of the control panel are electrically connected to the control circuit and used for sending different control signals to the control circuit, and the display screen of the control panel is electrically connected with the control circuit and used for displaying the working state of the thermostat.

In a further technical scheme, the control signals comprise a forward rotation control signal and a reverse rotation control signal, and in the one-time gear adjusting process, the temperature difference between the preset temperature and the ambient temperature is set as Y,

when the ambient temperature is higher than the preset temperature or the difference M between the gear number of the target gear and the gear number of the current gear is negative, the control circuit sends a forward rotation control signal to the motor, the motor rotates forward,

when the ambient temperature is lower than the preset temperature or the difference value M between the target gear and the current gear is positive, the control circuit sends a reverse control signal to the motor, and the motor rotates reversely.

In a further technical scheme, the control circuit pre-stores a temperature difference-gear automatic execution relation table, the temperature difference-gear automatic execution relation table comprises a plurality of temperature difference adjusting ranges, each temperature difference adjusting range corresponds to one gear, and when the difference Y reaches within one temperature difference adjusting range, the control circuit controls the motor to continuously work for M multiplied by Tx seconds according to the temperature difference-gear automatic execution relation table and the gear adjusting relation table and then stops.

In a further technical scheme, a control circuit pre-stores a time-gear automatic execution relation table, wherein the time-gear automatic execution relation table comprises a plurality of temperature control adjustment time points, each temperature control adjustment time point corresponds to one gear, and the control circuit stops after the time reaches one temperature control adjustment time point according to the time-gear automatic execution relation table and the gear adjustment relation table and controls the motor to continuously work for M multiplied by Tx seconds.

In further technical scheme, the thermostat still is provided with drive casing, drive casing fixed mounting in the shell, and drive mechanism and actuating mechanism set up respectively in drive casing's inside, and shell's upper portion is provided with the connecting block, and the upper portion of connecting block is provided with the connecting piece that is used for connecting block and control valve fixed connection.

In further technical scheme, the drive casing includes drive epitheca and drive drain pan, the bottom opening of drive epitheca, the bottom of drive drain pan installation in the drive epitheca, the upper portion of drive epitheca has a mounting port, the upper portion of mounting port is provided with a slide, the lower part and the drive epitheca integrated into one piece of slide, the drive hole that runs through the drive drain pan has been seted up at the middle part of drive drain pan, actuating mechanism slidable mounting in a slide, transmission mechanism sets up in the inside of drive epitheca, motor fixed mounting is in the bottom of drive drain pan, the output shaft of motor passes the inside that the drive hole stretched into the drive epitheca.

In a further technical scheme, the actuating mechanism comprises a thread cylinder, a rotary column and a push rod, wherein the thread cylinder is rotatably arranged in the driving upper shell, the upper part of the rotary column is provided with a limiting part, the lower part of the rotary column is provided with a transmission part, the push rod is fixed or integrally formed on the upper part of the rotary column, the push rod is in propping fit with the valve rod,

the outer wall of the limiting part is provided with a limiting block, the inner wall of the sliding cylinder is provided with a limiting groove corresponding to the limiting block along the vertical direction, the rotary column is vertically and slidably arranged in the sliding cylinder, the limiting block is in limiting fit with the limiting groove,

the outer wall of the transmission part is provided with external threads, the inner wall of the thread cylinder is provided with internal threads, the transmission part is in threaded connection with the thread cylinder through the external threads and the internal threads, and the transmission mechanism is in transmission connection with the thread cylinder.

In a further technical scheme, the transmission mechanism comprises a plurality of reduction gears, all the reduction gears are meshed with each other, the lower part of the sliding cylinder is provided with a transmission gear, the transmission gear is meshed with the reduction gear at the tail end, the output shaft of the motor is fixed with a driving gear, and the driving gear is meshed with the reduction gear at the front end.

By adopting the structure, compared with the prior art, the utility model has the following advantages: the temperature regulation is carried out to a plurality of gear that are provided with, and temperature regulation precision is more accurate, and is effectual constant temperature, through the drive time of control circuit control motor to control push rod's travel distance, and then adjust heating temperature, need not to adopt servo motor, reduction in production cost, simplified structure, control circuit is according to indoor temperature or at settlement time quantum automatically regulated temperature, need not manual regulation, convenient to use.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is an exploded view of the present utility model;

FIG. 3 is an exploded view of the actuator and transmission of the present utility model;

FIG. 4 is a cross-sectional view of the actuator and transmission of the present utility model;

FIG. 5 is a state reference diagram of gear P6 of the present utility model;

FIG. 6 is a state reference diagram of gear P5 of the present utility model;

FIG. 7 is a state reference diagram of gear P4 of the present utility model;

FIG. 8 is a state reference diagram of gear P3 of the present utility model;

FIG. 9 is a state reference diagram of the P2 shift stage of the present utility model;

FIG. 10 is a state reference diagram of gear P1 of the present utility model;

FIG. 11 is a state reference diagram of the P0 shift stage of the present utility model;

FIG. 12 is a table of gear adjustment relationships of the present utility model;

FIG. 13 is a table of time-gear automatic execution relationships of the present utility model;

FIG. 14 is a table of the temperature difference-shift automatic execution relationship of the present utility model.

In the figure:

1 a control valve and a valve rod 11;

2 an outer shell, 21 a connecting block, 22 a connecting piece, 23 a motor and 24 a control circuit;

6, a transmission mechanism, a 61 driving upper shell, a 63 sliding cylinder, a 64 limiting groove, a 65 driving bottom shell, a 66 driving hole, a 67 reducing gear, a 68 transmission gear and a 69 driving gear;

the device comprises a 7 executing mechanism, a 71 threaded cylinder, a 72 threaded column, a 73 limiting part, a 74 limiting block, a 75 transmission part and a 77 push rod;

81 display screen, 82 control keys.

Detailed Description

The following are only preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model.

As shown in fig. 1 to 14, the thermostat is provided with 7 gear positions, the thermostat is provided with an outer shell 2, a control circuit 24, a motor 23, a transmission mechanism 6 and an executing mechanism 7, the control circuit 24, the motor 23, the transmission mechanism 6 and the executing mechanism 7 are arranged in an inner cavity of the outer shell 2, the control circuit 24 is electrically connected with the motor 23, the motor 23 is in transmission connection with the transmission mechanism 6, the transmission mechanism 6 is in transmission connection with the executing mechanism 7, the executing mechanism 7 is provided with a push rod 77 for pushing a valve rod 11, the push rod 77 is provided with an opening and closing total stroke for adjusting the flow rate of the control valve 1, the opening and closing total stroke is provided with N unit strokes Lx, N is a natural number greater than 1, the sum of the N unit strokes Lx is equal to the opening and closing total stroke, the control circuit 24 is provided with a gear position adjustment relation table, the gear position adjustment relation table is provided with N unit driving times Tx seconds, the displacement of the push rod 77 is one unit stroke Lx when the motor 23 continuously works for one unit driving time Tx seconds, the surface of the outer shell 2 is provided with a control interface for setting a preset temperature, and a temperature sensor is used for electrically connecting with the temperature sensor 24 in the current gear position adjustment table, the gear position adjustment table is set for the current gear position adjustment table, and the temperature sensor is electrically controlled by the current gear position adjustment table is set for the temperature control interface, and the current position adjustment table is set and the gear position adjustment table is continuously and the temperature control interface is used for the current.

The 7 gears are respectively: the method comprises the steps of setting a gear to be reached by a thermostat as a target gear, and setting the gear currently located by the thermostat as a current gear, wherein the gear is a P0 gear, a P1 gear, a P2 gear, a P3 gear, a P4 gear, a P5 gear and a P6 gear;

in the P0 gear, as shown in fig. 11, the push rod 77 moves upward, the push rod 77 is located at the topmost position, the push rod 77 presses the valve rod 11, and the valve rod 11 is pushed into the valve body of the control valve 1, so that the control valve 1 is in a completely closed state;

in gear P1, as shown in fig. 10, the pushrod 77 is located 5/6 of the total travel of the pushrod 77,

in the P2 gear, as shown in fig. 9, the push rod 77 is located at 4/6 of the total stroke of the push rod 77,

in the P3 gear, as shown in fig. 8, the push rod 77 is located at 3/6 of the total stroke of the push rod 77,

in gear P4, as shown in fig. 7, the pushrod 77 is located at 2/6 of the total travel of the pushrod 77,

in gear P5, as shown in fig. 6, the pushrod 77 is located at 1/6 of the total travel of the pushrod 77,

in the P6 gear, as shown in fig. 5, the push rod 77 moves downward, the push rod 77 is located at the bottommost end, the push rod 77 lightly abuts against the valve rod 11, and the valve rod 11 moves downward under the pressure of the spring or the liquid in the valve body of the control valve 1 to extend, so that the control valve 1 is in a fully opened state;

the P6 gear is set to be in a high gear, the P0 gear is set to be in a low gear, the heating temperature of the P0 gear is smaller than the heating temperature of the P1 gear, the heating temperature of the P1 gear is smaller than the heating temperature of the P2 gear, the heating temperature of the P2 gear is smaller than the heating temperature of the P3 gear, the heating temperature of the P3 gear is smaller than the heating temperature of the P4 gear, and the heating temperature of the P5 gear is smaller than the heating temperature of the P6 gear.

In the gear adjustment relation table, as shown in fig. 12, the P0 gear is set to an initial state, the P1 gear corresponds to 1 unit stroke Lx and 1 unit driving time Tx, the P2 gear corresponds to 2 unit strokes Lx and 2 unit driving times Tx, the P3 gear corresponds to 3 unit strokes Lx and 3 unit driving times Tx, the P4 gear corresponds to 4 unit strokes Lx and 4 unit driving times Tx, the P5 gear corresponds to 5 unit strokes Lx and 5 unit driving times Tx, and the P6 gear corresponds to 6 unit strokes Lx and 6 unit driving times Tx.

Specifically, the control interface includes a control panel composed of a display screen 81 and a plurality of control keys 82 or a touch control screen electrically connected to the control circuit 24, wherein the control keys 82 of the control panel are electrically connected to the control circuit 24 and used for sending different control signals to the control circuit 24, and the display screen 81 of the control panel is electrically connected to the control circuit 24 and used for displaying the working state of the thermostat. The target gear or preset temperature is set by the control key 82 or touch control screen. The display screen 81 only plays a display role, and is matched with the control keys 82 to perform program setting and setting, so that the structure is simple and the cost is low.

Specifically, the outer casing 2 is provided with a temperature-sensitive mounting hole, the temperature sensor adopts an NTC thermistor, the NTC thermistor is mounted in the temperature-sensitive mounting hole, and the NTC thermistor is electrically connected with the control circuit 24. The NTC thermistor converts the resistance change signal into a voltage signal to the control circuit 24, thereby detecting the current ambient temperature.

Specifically, the control signals include a forward rotation control signal and a reverse rotation control signal, in which, in the one-time gear adjustment process, the temperature difference between the preset temperature and the ambient temperature is set to Y, when the ambient temperature is higher than the preset temperature or the difference M between the target gear and the number of gears of the current gear is negative, the control circuit 24 sends the forward rotation control signal to the motor 23, and when the ambient temperature is lower than the preset temperature or the difference M between the target gear and the number of gears of the current gear is positive, the control circuit 24 sends the reverse rotation control signal to the motor 23, and the motor 23 rotates reversely.

The gear switching principle of the utility model is as follows:

when shifting from P0 to P1, as shown in fig. 11 and 10, the target gear is P1, the current gear is P0, the difference M between the gear numbers is equal to 1, the control circuit 24 sends a reverse control signal to the motor 23, the motor 23 rotates reversely for 1×tx seconds, the push rod 77 moves downward for 1 unit stroke Lx, and the valve stem 11 simultaneously moves downward for 1 unit stroke Lx under spring or liquid pressure;

when shifting from P0 to P4, as shown in fig. 11 and 7, the target gear is P4, the current gear is P0, the difference M between the gear numbers is equal to 4, the control circuit 24 sends a reverse control signal to the motor 23, the motor 23 rotates reversely for 4×tx seconds, the push rod 77 moves downward for 4 unit strokes Lx, and the valve rod 11 simultaneously moves downward for 4 unit strokes Lx under spring or liquid pressure;

when shifting from P2 to P5, as shown in fig. 9 and 6, the target gear is P5, the current gear is P2, the difference M between the gear numbers is equal to 3, the control circuit 24 sends a reverse control signal to the motor 23, the motor 23 rotates reversely for 3×tx seconds, the push rod 77 moves downward for 3 unit strokes Lx, and the valve rod 11 simultaneously moves downward for 3 unit strokes Lx under spring or liquid pressure;

when shifting from P4 to P6, as shown in fig. 7 and 5, the target gear is P6, the current gear is P4, the difference M between the gear numbers is equal to 2, the control circuit 24 sends a reverse control signal to the motor 23, the motor 23 rotates reversely for 2×tx seconds, the push rod 77 moves downward for 2 unit strokes Lx, and the valve stem 11 simultaneously moves downward for 2 unit strokes Lx under spring or liquid pressure;

when shifting from P6 to P0, as shown in fig. 5 and 11, the target gear is P0, the current gear is P6, the difference M between the gear numbers is equal to-6, the control circuit 24 sends a forward rotation control signal to the motor 23, the motor 23 rotates forward for 6×tx seconds, the push rod 77 moves up for 6 unit strokes Lx, and the valve rod 11 simultaneously moves up for 6 unit strokes Lx under the pushing of the push rod 77;

when shifting from P5 to P1, as shown in fig. 6 and 10, the target gear is P1, the current gear is P5, the difference M between the gear numbers is equal to-4, the control circuit 24 sends a forward rotation control signal to the motor 23, the motor 23 rotates forward for 4×tx seconds, the push rod 77 moves up by 4 unit strokes Lx, and the valve rod 11 simultaneously moves up by 4 unit strokes Lx under the pushing of the push rod 77;

when shifting from P3 to P2, as shown in fig. 8 and 9, the target gear is P2, the current gear is P3, the difference M between the gear numbers is equal to-1, the control circuit 24 sends a forward rotation control signal to the motor 23, the motor 23 rotates forward for 1×tx seconds, the push rod 77 moves upward by 1 unit stroke Lx, and the valve rod 11 simultaneously moves upward by 1 unit stroke Lx under the pushing of the push rod 77;

similarly, when the low gear is shifted to the high gear, the control circuit 24 transmits a reverse rotation control signal to the motor 23, and the motor 23 rotates reversely; when the high gear is switched to the low gear, the control circuit 24 sends a forward rotation control signal to the motor 23, and the motor 23 rotates forward; and the driving time of the motor 23 is 1×2=3s when switching from the P0 gear to the P1 gear, and 2×2=4s when switching from the P4 gear to the P6 gear, based on the difference m×tx seconds between the target gear and the current gear, for example, the unit driving time Tx is 6 s.

Preferably, the gear adjustment relation table is further provided with a idle stroke driving time Ty, and when the current gear is at the P0 gear and the difference M is a positive number, the control circuit 24 sends a reverse control signal to the motor 23, the motor 23 is stopped after reversing m×tx+ty seconds, and the push rod 77 is moved from the current position to the target position. When the valve rod 11 of the control valve 1 has idle stroke due to manufacturing precision or when the push rod 77 is in plastic and can generate certain deformation when being pressed against the valve rod 11, the idle stroke driving time Ty is set to overcome the idle stroke of the valve rod 11 or the deformation of the push rod 77, so that the same opening difference value of the control valve 1 between two adjacent gears is ensured, and the control valve 1 can be opened in the P1 gear; the specific value of the idle stroke driving time Ty can be set through the control interface so as to control the valve 1 according to different accuracies.

The motor 23 of the conventional thermostat has low control precision to the valve rod 11, poor constant temperature effect, and poor experience sense due to the phenomenon that the indoor temperature is suddenly high and suddenly low along with the change of the outdoor temperature. The servo motor or the stepping motor is adopted to control the moving distance of the push rod 77 by controlling the driving stroke amount of the servo motor or the stepping motor, however, the servo motor and the stepping motor have high cost, and particularly the servo motor needs to be matched with an encoder, so that the structure is complex and the cost is high. In the present utility model, the movement distance of the push rod 77 is controlled by controlling the time of the power-on rotation of the motor 23, and the unit driving time Tx refers to the time of the power-on rotation of the motor 23, and when the motor 23 rotates for the unit driving time Tx seconds, the push rod is driven to move by one unit stroke Lx, and the movement distance of the push rod 77 is controlled by controlling the time of the power-on rotation of the motor 23, thereby realizing the temperature adjustment. The temperature adjustment is carried out to the gear that is provided with a plurality of, and temperature regulation precision is more accurate, and constant temperature is effectual, need not to adopt servo motor, reduction in production cost, and the simplified structure, control circuit 24 need not manual regulation according to indoor temperature or at settlement time quantum automatically regulated temperature, convenient to use.

The utility model has the following temperature regulation examples:

temperature adjustment example one:

as shown in fig. 14, the control circuit 24 pre-stores a temperature difference-gear automatic execution relationship table, the temperature difference-gear automatic execution relationship table includes 4 temperature difference adjustment ranges, each temperature difference adjustment range corresponds to one gear, and when the difference Y reaches within one temperature difference adjustment range, the control circuit 24 controls the motor 23 to continuously operate for m×tx seconds according to the temperature difference-gear automatic execution relationship table and the gear adjustment relationship table and then stops.

When the difference Y is greater than 0 ℃ and less than or equal to 2 ℃, the control circuit 24 switches the target gear to the P2 gear, as shown in fig. 9, the push rod 77 is located at 4/6 of the total stroke of the push rod 77, and at this time, the opening of the control valve 1 is 1/3 of the total opening;

when the difference Y is greater than 2 ℃ and less than or equal to 4 ℃, the control circuit 24 switches the target gear to the P4 gear, as shown in fig. 7, the push rod 77 is located at 2/6 of the total stroke of the push rod 77, and at this time, the opening of the control valve 1 is 2/3 of the total opening;

when the difference Y is greater than 4 ℃, the control circuit 24 switches the target gear to the P6 gear, as shown in fig. 5, the push rod 77 is located at the bottommost end, and the control valve 1 is in a fully opened state;

when the difference Y is equal to or less than 0 ℃, the control circuit 24 shifts the target gear to the P0 gear, and as shown in fig. 11, the push rod 77 is located at the topmost position, at which time the control valve 1 is in a fully closed state.

Different gears are switched through the difference Y between the preset temperature and the ambient temperature, so that the indoor temperature is quickly increased or decreased, the indoor temperature is kept constant at the preset temperature, the temperature adjusting precision is higher, and the constant temperature effect is better. The temperature difference-gear automatic execution relation table is not limited to setting 4 temperature difference adjusting ranges, and the thermostat frequently switches gears and the temperature is more constant by adding the number of the temperature difference adjusting ranges; the number of the temperature difference adjusting ranges is reduced, so that the frequency of gear switching of the thermostat is reduced, and energy consumption is saved.

Temperature regulation example two:

as shown in fig. 13, the control circuit 24 pre-stores a time-shift automatic execution relationship table including a plurality of temperature control adjustment time points, each corresponding to one shift, and the control circuit 24 stops after continuously operating the motor 23 for mxtx seconds according to the time-shift automatic execution relationship table and the shift adjustment relationship table when the time reaches one temperature control adjustment time point. The temperature control adjustment time point refers to one time point of 24 hours a day, 00: corresponding to P3 gear at 00, 06: corresponding to P5 gear, 07: gear 00 corresponds to gear P0 or P1, 17: corresponding to P6 gear, 18: corresponding to P5 gear, 20: gear 00 corresponds to gear P4, when time reaches 06: the control circuit 24 automatically switches the thermostat to the corresponding P5 gear, automatically and regularly switches the gear according to the time period, manual operation is not needed, the use is more convenient, and meanwhile, the preset time and gear in the time-gear automatic execution relation table can be changed and adjusted according to personal requirements through the control key 82 or the touch control screen, so that the applicability is improved.

Specifically, the thermostat is further provided with an outer casing 2 and a driving casing, the driving casing and the control circuit 24 are respectively disposed in the outer casing 2, the transmission mechanism 6 and the actuating mechanism 7 are respectively disposed in the driving casing, a connecting block 21 is disposed on the upper portion of the outer casing 2, and a connecting piece 22 for fixedly connecting the connecting block 21 with the control valve 1 is disposed on the upper portion of the connecting block 21. The transmission mechanism 6 and the actuating mechanism 7 are arranged in the driving shell, the motor 23 is fixedly arranged outside the driving shell, the structure is more compact, the structure is modularized, the production and the assembly are convenient, the driving shell wraps parts with transmission relation, dust and foreign matters are prevented from entering, the service life is prolonged, and the stability is improved.

Specifically, the drive casing includes drive upper shell 61 and drive drain pan 65, the bottom opening of drive upper shell 61, drive drain pan 65 installs in the bottom of drive upper shell 61, the upper portion of drive upper shell 61 has a mounting hole, the upper portion of mounting hole is provided with a slide tube 63, the lower part and the drive upper shell 61 integrated into one piece of slide tube 63, drive hole 66 that runs through drive drain pan 65 has been seted up at the middle part of drive drain pan 65, actuating mechanism 7 slidable mounting is in slide tube 63, drive mechanism 6 sets up in the inside of drive upper shell 61, motor 23 fixed mounting is in the bottom of drive drain pan 65, the output shaft of motor 23 passes drive hole 66 and stretches into the inside of drive upper shell 61. The motor 23 is fixedly arranged on the driving bottom shell 65, and an output shaft of the motor 23 stretches into the driving shell, so that the sealing performance is further improved.

Specifically, the actuating mechanism 7 includes a screw thread section of thick bamboo 71, a screw post 72 and push rod 77, screw thread section of thick bamboo 71 rotary mounting is in the inside of driving epitheca 61, the upper portion of screw post 72 is provided with spacing portion 73, the lower part of screw post 72 is provided with drive portion 75, push rod 77 integrated into one piece is in the upper portion of screw post 72, push rod 77 and valve rod 11 support the cooperation, the outer wall of spacing portion 73 is provided with stopper 74, the inner wall of slide section of thick bamboo 63 is provided with the spacing groove 64 that corresponds with stopper 74 along vertical direction, screw post 72 slidable mounting is in the inside of slide section of thick bamboo 63 from top to bottom, stopper 74 and spacing groove 64 spacing cooperation, the outer wall of drive portion 75 is provided with the external screw thread, the inner wall of screw thread section of thick bamboo 71 is provided with the internal screw thread, drive portion 75 passes through external screw thread and internal screw thread threaded connection with screw thread section of thick bamboo 71, drive mechanism 6 and drive connection. The transmission mechanism 6 includes a plurality of reduction gears 67, the respective reduction gears 67 are engaged with each other, a transmission gear 68 is provided at a lower portion of the screw cylinder 71, the transmission gear 68 is engaged with the reduction gear 67 at the end, a drive gear 69 is fixed to an output shaft of the motor 23, and the drive gear 69 is engaged with the reduction gear 67 at the front end.

The output shaft of the motor 23 drives the driving gear 69 to rotate, the driving gear 69 drives each reduction gear 67 to rotate, each reduction gear 67 plays a role in reducing speed, and the reduction gear 67 at the last end drives the transmission gear 68 to rotate, so that the thread cylinders 71 rotate together; the screw cylinder 71 drives the screw column 72 to move up and down under the action of the internal screw thread, and the screw column 72 is prevented from rotating along with the screw cylinder 71 by the limit block 74 of the screw column 72 and the limit groove 64 of the slide cylinder 63 in limit fit, so that the screw column 72 is only displaced in the vertical direction. Preferably, the center of the rotary column 72 is provided with a rod inserting hole with an upward opening, the push rod 77 is inserted into the rod inserting hole, the upper part of the push rod 77 protrudes out of the upper surface of the rotary column 72, the depth of the push rod 77 inserted into the rod inserting hole is adjusted, so that the extension length of the push rod 77 is adjusted, when the thermostat is installed on the control valve 1 after the motor 23 drives the push rod 77 to descend to the lowest point, a larger gap is reserved between the valve rod 11 and the push rod 77 of the control valve 1, the depth of the push rod 77 inserted into the rod inserting hole is adjusted, the gap between the push rod 77 and the valve rod 11 approaches 0, and idle stroke of the push rod 77 is prevented.

The thermostat is not limited to setting 7 gears, can also set 3 or more than 3 gears, improves the adjustment precision through increasing the gear number, satisfies different demands.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims (10)

1. High-precision low-cost thermostat, the thermostat is provided with N+1 keeps off position, its characterized in that: the thermostat is provided with an outer shell (2), a control circuit (24), a motor (23), a transmission mechanism (6) and an actuating mechanism (7), wherein the control circuit (24), the motor (23), the transmission mechanism (6) and the actuating mechanism (7) are arranged in the inner cavity of the outer shell (2),

the control circuit (24) is electrically connected with the motor (23), the motor (23) is in transmission connection with the transmission mechanism (6), the transmission mechanism (6) is in transmission connection with the execution mechanism (7), the execution mechanism (7) is provided with a push rod (77) for pushing the valve rod (11),

the push rod (77) has an opening and closing total stroke for adjusting the flow rate of the control valve (1), the opening and closing total stroke is provided with N unit strokes Lx, N is a natural number greater than 1, the sum of the N unit strokes Lx is equal to the opening and closing total stroke,

the control circuit (24) is provided with a gear adjustment relation table provided with N unit driving times Tx seconds, the displacement of the push rod (77) is a unit stroke Lx when the motor (23) continuously works for one unit driving time Tx seconds,

the surface of the outer shell (2) is provided with a control interface for setting preset temperature and a temperature sensor for monitoring ambient temperature, the control interface and the temperature sensor are respectively and electrically connected with a control circuit (24),

in the one-time gear adjustment process, the difference value of the gear number of the target gear and the current gear is set to be M, and a control circuit (24) receives a control signal of a control interface and controls a motor (23) to continuously work for M multiplied by Tx seconds according to a gear adjustment relation table and then stops.

2. A high precision low cost thermostat according to claim 1 wherein: the shell body (2) is provided with a temperature-sensitive mounting hole, the temperature sensor adopts an NTC thermistor, the NTC thermistor is mounted in the temperature-sensitive mounting hole, and the NTC thermistor is electrically connected with the control circuit (24).

3. A high precision low cost thermostat according to claim 1 wherein: the control interface comprises a control panel composed of a display screen (81) and a plurality of control keys (82) or a touch control screen electrically connected to the control circuit (24), wherein the control keys (82) of the control panel are electrically connected to the control circuit (24) and used for sending different control signals to the control circuit (24), and the display screen (81) of the control panel is electrically connected with the control circuit (24) and used for displaying the working state of the thermostat.

4. A high precision low cost thermostat according to claim 3 wherein: the control signals comprise a forward rotation control signal and a reverse rotation control signal, in the one-time gear adjusting process, the temperature difference value between the preset temperature and the environment temperature is set to be Y,

when the ambient temperature is higher than the preset temperature or the difference M between the gear number of the target gear and the gear number of the current gear is negative, the control circuit (24) sends a forward rotation control signal to the motor (23), the motor (23) rotates forward,

when the ambient temperature is lower than the preset temperature or the difference M between the target gear and the current gear is positive, the control circuit (24) sends a reverse control signal to the motor (23), and the motor (23) rotates reversely.

5. A high precision low cost thermostat according to claim 4 wherein: the control circuit (24) pre-stores a temperature difference-gear automatic execution relation table, the temperature difference-gear automatic execution relation table comprises a plurality of temperature difference adjusting ranges, each temperature difference adjusting range corresponds to one gear, and when the difference Y reaches within one temperature difference adjusting range, the control circuit (24) controls the motor (23) to continuously work for M multiplied by Tx seconds according to the temperature difference-gear automatic execution relation table and the gear adjusting relation table and then stops.

6. A high precision low cost thermostat according to claim 4 wherein: the control circuit (24) pre-stores a time-gear automatic execution relation table, the time-gear automatic execution relation table comprises a plurality of temperature control adjustment time points, each temperature control adjustment time point corresponds to one gear, and when the time reaches one temperature control adjustment time point, the control circuit (24) controls the motor (23) to continuously work for M multiplied by Tx seconds according to the time-gear automatic execution relation table and the gear adjustment relation table and then stops.

7. A high precision low cost thermostat according to any one of claims 1 to 6 wherein: the thermostat is characterized in that the thermostat is further provided with a driving shell, the driving shell is fixedly installed in the outer shell (2), the transmission mechanism (6) and the actuating mechanism (7) are respectively arranged in the driving shell, a connecting block (21) is arranged on the upper portion of the outer shell (2), and a connecting piece (22) used for fixedly connecting the connecting block (21) with the control valve (1) is arranged on the upper portion of the connecting block (21).

8. A high precision low cost thermostat according to claim 7 wherein: the utility model provides a drive casing includes drive epitheca (61) and drive drain pan (65), the bottom opening of drive epitheca (61), the bottom of drive epitheca (61) is installed in drive drain pan (65), the upper portion of drive epitheca (61) has a mounting hole, the upper portion of mounting hole is provided with slide (63), the lower part and the drive epitheca (61) integrated into one piece of slide (63), drive hole (66) that run through drive drain pan (65) are seted up at the middle part of drive drain pan (65), actuating mechanism (7) slidable mounting is in slide (63), drive mechanism (6) set up in the inside of drive epitheca (61), motor (23) fixed mounting is in the bottom of drive drain pan (65), the inside that drive hole (66) were passed to the output shaft of motor (23) stretches into drive epitheca (61).

9. A high precision low cost thermostat according to claim 8 wherein: the actuating mechanism (7) comprises a threaded cylinder (71), a rotary column (72) and a push rod (77), the threaded cylinder (71) is rotatably arranged in the driving upper shell (61), a limiting part (73) is arranged on the upper part of the rotary column (72), a transmission part (75) is arranged on the lower part of the rotary column (72), the push rod (77) is fixed or integrally formed on the upper part of the rotary column (72), the push rod (77) is in propping fit with the valve rod (11),

the outer wall of the limiting part (73) is provided with a limiting block (74), the inner wall of the sliding cylinder (63) is provided with a limiting groove (64) corresponding to the limiting block (74) along the vertical direction, the rotary column (72) is vertically and slidably arranged in the sliding cylinder (63), the limiting block (74) is in limiting fit with the limiting groove (64),

the outer wall of drive portion (75) is provided with the external screw thread, and the inner wall of screw thread section of thick bamboo (71) is provided with the internal screw thread, and drive portion (75) and screw thread section of thick bamboo (71) pass through external screw thread and internal screw thread threaded connection, drive mechanism (6) are connected with screw thread section of thick bamboo (71) transmission.

10. A high precision low cost thermostat according to claim 9 wherein: the transmission mechanism (6) comprises a plurality of reduction gears (67), the reduction gears (67) are meshed with each other, a transmission gear (68) is arranged at the lower part of the sliding cylinder (63), the transmission gear (68) is meshed with the reduction gear (67) at the tail end, a driving gear (69) is fixed on the output shaft of the motor (23), and the driving gear (69) is meshed with the reduction gear (67) at the front end.