Wide-temperature programmable controller

Abstract

The invention discloses a wide-temperature programmable controller, which belongs to the technical field of controllers and comprises a plastic shell and a temperature sensor, a central control board and a power supply processing board are respectively arranged on two sides of an inner cavity of the plastic shell, a pin of the temperature sensor is electrically connected with the power supply processing board, and the central control board is electrically connected with the power supply processing board. The power supply processing board is provided with a temperature compensation unit, and further comprises an expansion pipe fixedly connected to one side wall of the plastic shell, an outer control pipe integrally welded to the expansion pipe, and a self-heat-removal module located on the expansion pipe and the outer control pipe; the self-heat-removal module at least comprises a piston rod arranged in the expansion pipe and the outer control pipe in a sliding mode, an air bag filled in an inner cavity of the outer control pipe and a fan installed in an inner cavity of the expansion pipe. According to the wide-temperature programmable controller, the air channel with air inlet at the bottom and air outlet at the top is constructed, the rapid and effective heat dissipation effect is achieved, dust entering the plastic shell is reduced to the maximum extent, and the influence on electronic elements is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of controllers, and in particular relates to a wide-temperature programmable controller. Background Art

[0002] In the field of factory automation, a combined programmable logic controller consisting of multiple control units is often used. In a programmable logic controller in which multiple control units are installed on a base unit, the installation position of the control units is set in the following manner, that is, the adjacent control units are arranged without gaps from each other. In order to ensure normal operation corresponding to the control program, the programmable logic controller sets an upper limit on the ambient temperature during operation and the altitude of the place of use. If the operation is forced to be performed in an environment exceeding the upper limit, the programmable controller becomes the following state, that is, the heat dissipation from the control circuit in the control unit becomes insufficient, and abnormalities caused by overheating may occur.

[0003] Existing programmable controllers are generally only suitable for environments with a temperature range of -10℃ to 70℃, which limits its scope of application and makes it impossible for existing programmable controllers to achieve a wide temperature effect. This is mainly because at lower or higher temperatures, its internal power supply is unstable and can easily cause program errors.

[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the technology: the patent with application number CN201120342550.3 in the prior art - the networked wide-temperature Ethernet programmable controller, not only does not have a wide-temperature adaptation structure that can adapt to different altitudes, but also leads to the internal environment temperature being too high in some scenarios due to factors such as the external environment being too high or the internal electronic components continuing to heat up, thereby causing the electronic components to malfunction; not only that, if an active heat dissipation structure is directly set on the controller, and the operation of the active heat dissipation structure requires air exchange with the external environment, long-term air exchange will definitely cause solid matter such as dust from the external environment to enter the controller, thereby further affecting the operation of the electronic components.

[0005] Therefore, we propose a wide temperature programmable controller to solve the above problems. Summary of the invention

[0006] The main purpose of the present invention is to provide a wide-temperature programmable controller, construct an air duct with bottom air inlet and top air outlet, achieve a quick and effective heat dissipation effect, and minimize the entry of dust into the plastic casing and reduce the impact on electronic components, which can effectively solve the problems in the background technology.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A wide temperature programmable controller, comprising a plastic shell and a temperature sensor, a central control board and a power processing board are respectively arranged on both sides of the inner cavity of the plastic shell, the central control board and the power processing board are connected through a pin row, the pin of the temperature sensor is electrically connected to the power processing board, and a temperature compensation unit is arranged on the power processing board;

[0009] It also includes an extension tube fixedly connected to a side wall of the plastic shell, an external control tube integrally welded to the extension tube, and a self-heat dissipation module located on the extension tube and the external control tube, wherein the self-heat dissipation module at least includes a piston rod slidably arranged in the extension tube and the external control tube, an air bag filled in the inner cavity of the external control tube, and a fan installed in the inner cavity of the extension tube, and two heat dissipation ports are symmetrically formed on one side of the outer wall of the extension tube close to the external control tube, and the piston rod passes through the two heat dissipation ports;

[0010] The external control tube is designed in an L shape, and the side of the external control tube facing away from the extension tube extends vertically upward, and an installation groove is formed at the top of the inner cavity of the external control tube, and a pressure sensor is installed in the installation groove, and the top of the airbag is close to the pressure sensor, and an external plate is fixedly welded on the side of the external control tube facing away from the plastic shell, and a control box is fixedly connected to the external plate, and a circuit board is fixed in the inner cavity of the control box, wherein a single-chip microcomputer chip is installed on the circuit board, a lower edge rod is fixedly connected to the bottom of the outer wall of the piston rod, and a bottom sealing block is integrally welded to the side of the lower edge rod facing away from the piston rod, and an air inlet adapted to the bottom sealing block is formed at the bottom of the plastic shell on the side where the extension tube is located, the pressure sensor and the fan are electrically connected to the single-chip microcomputer chip, and all power structures on the extension tube and the external control tube need to be powered by external power facilities.

[0011] As a preferred embodiment, a switching power supply circuit is provided on the power processing board, the temperature compensation unit is a PWM control unit, the PWM control unit is connected to the switching power supply circuit, and the temperature sensor is connected to the PWM control unit in sequence through an amplification unit and an A / D conversion unit.

[0012] As a preferred embodiment, a copper plate is fixed under the power processing board.

[0013] As a preferred embodiment, the surfaces of the central control board and the power processing board are coated with conformal coating.

[0014] As a preferred embodiment, extension columns are fixedly connected to the two opposite side walls of the piston rod, and sliders are welded to the opposite sides of the two extension columns; the sliders are designed in an I-shape.

[0015] As a preferred embodiment, edge grooves are formed on both sides of the inner cavity of the extension tube and on both sides of the inner cavity of the outer control tube, and the upper and lower sides of the slider slide into two of the edge grooves respectively and fit against the inner walls of the edge grooves; when the piston rod slides, it can drive the two sliders to slide in the two edge grooves, thereby ensuring the stability of the piston rod. It should be noted that the slider cannot close the inner cavity of the extension tube or the inner cavity of the outer control tube, and the slider located in the outer control tube fits against one side of the airbag, thereby facilitating the squeezing of the airbag.

[0016] As a preferred embodiment, a sliding sleeve is integrally welded on the side of the outer wall of the piston rod close to the extension tube, wherein the sliding sleeve fits the inner wall of the extension tube; the sliding sleeve can better seal the heat dissipation port under normal conditions to prevent air leakage from the inner cavity of the plastic shell through the heat dissipation port.

[0017] As a preferred embodiment, the airbag at least includes a horizontal end and a vertical end connected to each other, wherein the horizontal end and the vertical end are both close to the inner wall of the outer control tube; and the horizontal end and the vertical end can slide smoothly in the outer control tube.

[0018] As a preferred embodiment, a pointed end is provided above the vertical end, and two symmetrical inclined inner walls are provided at the top of the inner cavity of the outer control tube, wherein the pointed end is located between the two inclined inner walls; when the horizontal end and the vertical end are compressed, the pointed end will be driven to move upward and deform with the help of the inclined inner walls, thereby squeezing and contacting the pressure sensor faster.

[0019] As a preferred embodiment, two copper pillars are fixedly connected to the inner wall of the control box, and the circuit board is attached to the two copper pillars. Screws that penetrate into the two copper pillars are installed on the circuit board; thus, the circuit board is fixed to the two copper pillars by screws.

[0020] In summary, the technical effects and advantages of the present invention are as follows:

[0021] The wide-temperature programmable controller is connected with an extension tube and an external control tube on one side of a plastic shell. When a central control board and a power processing board in the plastic shell continue to generate heat and heat the air in the inner cavity of the plastic shell (or the temperature rises due to the external environment), the air will squeeze the airbag through the piston rod and the slider due to the property of thermal expansion and contraction, and the pointed end of the airbag will touch the pressure sensor, so that the pressure sensor transmits an electrical signal to the single-chip microcomputer chip, so that the single-chip microcomputer chip drives the fan to run. Since the piston rod moves toward the side where the airbag is located, the heat dissipation port and the air inlet port can be opened, and the fan is used to actively dissipate heat in a short time, thereby constructing an air duct with bottom air intake and top air outlet (in a short time), achieving a fast and effective heat dissipation effect; when the temperature in the plastic shell drops, the airbag will push the piston rod back to its original position, close the heat dissipation port and the air inlet port, thereby minimizing the dust entering the plastic shell and reducing the impact on electronic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of the plastic housing of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the first viewing angle of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the second viewing angle of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the third viewing angle of the present invention;

[0026] Figure 5 It is a partial cross-sectional view of the heat dissipation port and the air inlet of the present invention when they are closed;

[0027] Figure 6 For the present invention Figure 5 The enlarged picture of the heat dissipation port at A in the middle is closed;

[0028] Figure 7 For the present invention Figure 5 A magnified view of the structure at B in the middle;

[0029] Figure 8 It is a partial cross-sectional view of the heat dissipation port and the air inlet of the present invention when they are opened;

[0030] Fig. 9 For the present invention Figure 5 Enlarged view of the heat dissipation vent at A in the middle when it is open.

[0031] In the figure: 1. plastic shell; 2. central control board; 3. power processing board; 4. temperature sensor; 5. pin header; 6. copper plate; 7. extension tube; 8. external control tube; 9. piston rod; 10. sliding sleeve; 11. heat dissipation port; 12. extension column; 13. slider; 14. edge slide groove; 15. air bag; 1501. horizontal end; 1502. vertical end; 1503. pointed end; 16. mounting groove; 17. pressure sensor; 18. external plate; 19. control box; 20. circuit board; 21. single-chip microcomputer chip; 22. copper column; 23. screw; 24. oblique inner wall; 25. lower edge rod; 26. bottom sealing block; 27. air inlet; 28. fan. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Reference Figure 1-Figure 7 The present invention discloses a wide temperature programmable controller.

[0034] By the attached Figure 1 It can be seen that it mainly includes a plastic shell 1 and a temperature sensor 4 located therein. A central control board 2 and a power processing board 3 are respectively arranged on both sides of the inner cavity of the plastic shell 1. The central control board 2 and the power processing board 3 are connected through a pin row 5. The pin of the temperature sensor 4 is electrically connected to the power processing board 3. A temperature compensation unit is arranged on the power processing board 3; a switching power supply circuit is arranged on the power processing board 3, and the temperature compensation unit is a PWM control unit. The PWM control unit is connected to the switching power supply circuit. The temperature sensor 4 is connected to the PWM control unit through an amplification unit and an A / D conversion unit in sequence. A copper plate 6 is fixed under the power processing board 3. The size of the copper plate 6 is the same as that of the power processing board 3. The copper plate 6 is electrically isolated from the power processing board 3. The copper plate 6 has a shielding layer function to enhance the anti-interference performance of the power circuit. The surfaces of the central control board 2 and the power processing board 3 are coated with three-proof paint;

[0035] By the attached Figures 2 to 4 It can be seen that, in addition to the plastic shell 1 and the structure therein, it also includes an extension tube 7 fixedly connected to a side wall of the plastic shell 1, an external control tube 8 integrally welded to the extension tube 7, and a self-heat dissipation module located on the extension tube 7 and the external control tube 8, wherein the self-heat dissipation module at least includes a piston rod 9 slidably arranged in the extension tube 7 and the external control tube 8, an air bag 15 filled in the inner cavity of the external control tube 8, and a fan 28 installed in the inner cavity of the extension tube 7, and two heat dissipation ports 11 are symmetrically formed on one side of the outer wall of the extension tube 7 close to the external control tube 8, and the piston rod 9 passes through the two heat dissipation ports 11;

[0036] It is worth noting that the two opposite side walls of the piston rod 9 are respectively fixedly connected with extension columns 12, and the two extension columns 12 are welded with sliders 13 on the opposite sides. The sliders 13 are designed in an I-shape, and edge grooves 14 are formed on both sides of the inner cavity of the extension tube 7 and the inner cavity of the external control tube 8. The upper and lower sides of the sliders 13 slide into two of the edge grooves 14 and fit with the inner walls of the edge grooves 14, so that when the piston rod 9 slides, the two sliders 13 can be driven to slide in the two edge grooves 14, thereby To ensure the stability of the piston rod 9, it should be noted that the slider 13 cannot close the inner cavity of the extension tube 7 or the inner cavity of the external control tube 8. The slider 13 located in the external control tube 8 fits with one side of the airbag 15, so as to facilitate the squeezing of the airbag 15. A sliding sleeve 10 is also integrally welded to the side of the outer wall of the piston rod 9 close to the extension tube 7, wherein the sliding sleeve 10 fits with the inner wall of the extension tube 7. The sliding sleeve 10 can better close the heat dissipation port 11 under normal conditions to prevent air leakage from the inner cavity of the plastic shell 1 through the heat dissipation port 11.

[0037] By the attached Figure 5 , Attachment Figure 7It can be seen that the external control tube 8 is designed in an L shape, and the side of the external control tube 8 facing away from the extension tube 7 extends vertically upward, and a mounting groove 16 is formed on the top of the inner cavity of the external control tube 8, and a pressure sensor 17 is installed in the mounting groove 16, and the top of the airbag 15 is close to the pressure sensor 17, and an external plate 18 is fixedly welded on the side of the external control tube 8 facing away from the plastic shell 1, and a control box 19 is fixedly connected to the external plate 18, and a circuit board 20 is fixed in the inner cavity of the control box 19, wherein a single-chip microcomputer chip 21 is installed on the circuit board 20, and the model of the single-chip microcomputer chip 21 can be STC89C51 or others, and two copper pillars 22 are fixedly connected to the inner wall of the control box 19, and the circuit board 20 is attached to the two copper pillars 22, and screws 23 respectively inserted into the two copper pillars 22 are installed on the circuit board 20, so that the circuit board 20 is fixed to the two copper pillars 22 by using the screws 23;

[0038] By the attached Figures 2 to 5 It can be seen that a lower edge rod 25 is fixedly connected to the bottom of the outer wall of the piston rod 9 (the lower edge rod 25 is L-shaped, and a reinforcing rod is welded on the inner side thereof), and a bottom sealing block 26 is integrally welded on the side of the lower edge rod 25 facing away from the piston rod 9, and an air inlet 27 adapted to be inserted with the bottom sealing block 26 is formed at the bottom of the plastic shell 1 on the side where the extension tube 7 is located, and the pressure sensor 17 and the fan 28 are both electrically connected to the single-chip microcomputer chip 21. The pressure sensor 17 can refer to the technical principle of the HZC-M1 model, and all power structures on the extension tube 7 and the external control tube 8 need to be powered by external power facilities;

[0039] By the attached Figure 5 , Attachment Figure 7 It can be seen that the airbag 15 at least includes a horizontal end 1501 and a vertical end 1502 that are connected to each other, wherein the horizontal end 1501 and the vertical end 1502 are both close to the inner wall of the outer control tube 8, and the horizontal end 1501 and the vertical end 1502 can both slide smoothly in the outer control tube 8, a pointed end 1503 is provided above the vertical end 1502, and two symmetrical inclined inner walls 24 are provided on the top of the inner cavity of the outer control tube 8, and the angle between the plane where the inclined inner wall 24 is located and the horizontal plane is 50°~80°, which belongs to a steeper type of inner wall, and the pointed end 1503 is located between the two inclined inner walls 24, so that when the horizontal end 1501 and the vertical end 1502 are compressed, it is easy to drive the pointed end 1503 to move upward and deform with the help of the inclined inner wall 24, so as to squeeze and contact the pressure sensor 17 faster.

[0040] The wide temperature programmable controller is in normal working condition, as shown in the attached Figures 1 to 7As shown, when the heat generated by the operation of the central control board 2 and the power processing board 3 in the plastic shell 1 will not cause the ambient temperature of the inner cavity of the plastic shell 1 to overheat, and at the same time, the external ambient temperature of the plastic shell 1 is low and will not cause the gas in the inner cavity of the plastic shell 1 to expand slightly due to the excessive temperature, the piston rod 9 (and the sliding sleeve 10) are located in the extension tube 7 and the external control tube 8 at the same time, that is, a part of the piston rod 9 is located in the extension tube 7, and this part is in contact with the inner wall of the extension tube 7 with the help of the sliding sleeve 10, so as to seal the extension tube 7 from the external environment, and the other part of the piston rod 9 enters the external control tube 8, and this part of the piston rod 9 will not squeeze the airbag 15 with the help of the slider 13 on one side thereof, nor will it trigger the airbag 15 to squeeze the pressure sensor 17, so the fan 28 is in a stopped state, and at this time the heat dissipation port 11 is closed by the piston rod 9, and the air inlet 27 is closed by the bottom sealing block 26, so the environment of the inner cavity of the plastic shell 1 does not produce any gas (and the heat contained therein) exchange with the external environment;

[0041] Based on the above drawings, see the attached Figures 8-9 When the temperature inside the plastic shell 1 rises due to continuous operation of the central control board 2 and the power processing board 3 in the plastic shell 1, or the temperature inside the plastic shell 1 is too high due to external factors such as the high temperature of the external environment in which the plastic shell 1 is located, the air pressure in the plastic shell 1 also increases (slightly exceeding a standard atmospheric pressure). (The inner cavity of the plastic shell 1 can only exchange gas with the outside world through the heat dissipation port 11 or the air inlet 27). At this time, due to the principle of thermal expansion and contraction of the air in the inner cavity of the plastic shell 1, the piston rod 9 in the expansion tube 7 and the bottom sealing block 26 in the air inlet 27 are squeezed, so that the piston rod 9 (cooperating with the lower edge rod 25 and the bottom sealing block 26 connected thereto) moves toward The piston rod 9 and the sliding sleeve 10 slide along the inner walls of the extension tube 7 and the outer control tube 8, and the air inlet 27 slides in the bottom sealing block 26. At the same time, the extension columns 12 on both sides of the piston rod 9 drive the two sliders 13 to translate in their own edge grooves 14 (the design of the two sliders 13 and the edge grooves 14 thereon can prevent the piston rod 9 from being stuck inside the heat dissipation port 11), so that the piston rod 9 and the bottom sealing block 26 both translate in the direction away from the plastic shell 1 and open the air inlet 27 and the two heat dissipation ports 11. At this time, the inner cavity of the plastic shell 1 is connected to the external environment, so that the heat in the plastic shell 1 can be dissipated;

[0042] However, this is not enough (because the external environment may be hotter). Therefore, when the piston rod 9 moves toward the inner side of the outer control tube 8, it will squeeze the horizontal end 1501, and the horizontal end 1501 will squeeze the vertical end 1502 and the pointed end 1503, and finally the pointed end 1503 will contact the pressure sensor 17 and generate pressure thereon. When the pressure sensor 17 detects the pressure, it transmits an electrical signal to the single-chip microcomputer chip 21, so that the single-chip microcomputer chip 21 transmits an electrical signal to drive the fan 28 to be powered on. When the fan 28 is running, it inhales air from the air inlet 27, and blows the heat in the inner cavity of the plastic housing 1 out from the two heat dissipation ports 11 along the air circulation, thereby lowering the temperature of the inner cavity of the plastic housing 1 by active heat dissipation.

[0043] As the temperature inside the plastic shell 1 decreases, the air pressure inside the plastic shell 1 gradually decreases. When the air pressure decreases, the airbag 15 will in turn push the piston rod 9, causing it to slide back into the extension tube 7 and gradually close the two heat dissipation ports 11. At the same time, the bottom sealing block 26 will close the air inlet 27, thus returning to a state in which the plastic shell 1 is isolated from the external environment. In this state, dust and other objects from the outside are prevented from entering the plastic shell 1. Thereafter, the pointed end 1503 is separated from the pressure sensor 17, so that the pressure sensor 17 cannot detect pressure, and the circuit board 20 will also drive the fan 28 to stop rotating to restore a calm state.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A wide temperature programmable controller, characterized in that: The invention comprises a plastic shell (1) and a temperature sensor (4), wherein a central control board (2) and a power processing board (3) are respectively arranged on both sides of the inner cavity of the plastic shell (1), the central control board (2) and the power processing board (3) are connected via a pin row (5), the pin of the temperature sensor (4) is electrically connected to the power processing board (3), and a temperature compensation unit is arranged on the power processing board (3); It also includes an extension tube (7) fixedly connected to a side wall of the plastic shell (1), an external control tube (8) integrally welded to the extension tube (7), and a self-heat dissipation module located on the extension tube (7) and the external control tube (8), wherein the self-heat dissipation module at least includes a piston rod (9) slidably arranged in the extension tube (7) and the external control tube (8), an air bag (15) filled in the inner cavity of the external control tube (8), and a fan (28) installed in the inner cavity of the extension tube (7), and two heat dissipation ports (11) are formed on a side of the outer wall of the extension tube (7) close to the external control tube (8); The top of the inner cavity of the external control tube (8) is formed with a mounting groove (16), and a pressure sensor (17) is installed in the mounting groove (16). The top of the airbag (15) is close to the pressure sensor (17). An outer plate (18) is fixedly welded to the side of the external control tube (8) facing away from the plastic shell (1), and a control box (19) is fixedly connected to the outer plate (18). A circuit board (20) is fixed in the inner cavity of the control box (19), wherein the circuit board A single-chip microcomputer chip (21) is installed on (20), a lower edge rod (25) is fixedly connected to the bottom of the outer wall of the piston rod (9), and a bottom sealing block (26) is integrally welded to the side of the lower edge rod (25) facing away from the piston rod (9), and an air inlet (27) adapted to be inserted into the bottom sealing block (26) is formed at the bottom of the plastic shell (1) on the side where the extension tube (7) is located, and the pressure sensor (17) and the fan (28) are both electrically connected to the single-chip microcomputer chip (21).

2. A wide temperature programmable controller according to claim 1, characterized in that: The power processing board is provided with a switching power supply circuit, the temperature compensation unit is a PWM control unit, the PWM control unit is connected to the switching power supply circuit, and the temperature sensor is connected to the PWM control unit via an amplification unit and an A / D conversion unit in sequence.

3. A wide temperature programmable controller according to claim 1, characterized in that: A copper plate is fixed under the power processing board.

4. A wide temperature programmable controller according to claim 1, characterized in that: The surfaces of the central control board and the power processing board are coated with three-proof paint.

5. A wide temperature programmable controller according to claim 1, characterized in that: The two opposite side walls of the piston rod (9) are respectively fixedly connected with extension columns (12), and the two opposite sides of the two extension columns (12) are welded with sliding blocks (13).

6. A wide temperature programmable controller according to claim 5, characterized in that: Edge slide grooves (14) are formed on both sides of the inner cavity of the extension tube (7) and the inner cavity of the external control tube (8), and the upper and lower sides of the slider (13) slide into two of the edge slide grooves (14) respectively and fit with the inner walls of the edge slide grooves (14).

7. A wide temperature programmable controller according to claim 5, characterized in that: A sliding sleeve (10) is integrally welded to a side of the outer wall of the piston rod (9) close to the extension tube (7), wherein the sliding sleeve (10) is in contact with the inner wall of the extension tube (7).

8. A wide temperature programmable controller according to claim 1, characterized in that: The airbag (15) comprises at least a horizontal end (1501) and a vertical end (1502) which are connected to each other, wherein the horizontal end (1501) and the vertical end (1502) are both close to the inner wall of the external control tube (8).

9. A wide temperature programmable controller according to claim 8, characterized in that: A pointed end (1503) is provided above the vertical end (1502), and two symmetrical oblique inner walls (24) are provided at the top of the inner cavity of the external control tube (8), wherein the pointed end (1503) is located between the two oblique inner walls (24).

10. A wide temperature programmable controller according to claim 1, characterized in that: Two copper pillars (22) are fixedly connected to the inner wall of the control box (19), and the circuit board (20) is attached to the two copper pillars (22). Screws (23) respectively inserted into the two copper pillars (22) are installed on the circuit board (20).

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