Cooling structure for pneumatic actuating mechanism

Abstract

The invention relates to a cooling structure for a pneumatic actuating mechanism. The device comprises a mounting body which is arranged on the end face of a cylinder cover; the air inlet cavity is arranged in the mounting body and is annularly arranged, the air inlet cavity is provided with an air inlet for introducing cooling air and a plurality of air spray holes surrounding the push rod, and the air inlet extends in the axial direction of the push rod; the penetrating channel penetrates through the mounting body, one end of the penetrating channel is tightly attached to the end face of the cylinder cover and allows the push rod to penetrate through, and an air outlet is formed between the penetrating channel and the push rod; the gas spraying hole is communicated with the gas inlet cavity and the gas outlet, and cooling gas introduced through the gas inlet can be blown to the surface of the push rod through the gas spraying hole and then is discharged from the gas outlet. According to the invention, real-time temperature detection can be carried out on key components, such as a push rod of a pneumatic actuating mechanism, which are easily influenced by temperature rise due to heat conduction, effective temperature control and cooling adjustment can be realized, and meanwhile, the structure is compact on the premise of keeping the performance.

Description

Technical Field

[0001] The invention relates to the technical field of instruments and meters dedicated to the control valve industry, and in particular to a cooling structure for a pneumatic actuator. Background Art

[0002] In industrial automation control systems, pneumatic actuators, as one of the important driving devices of control valves, are widely used in petrochemical, coal chemical, steel smelting and other fields. The normal operation of pneumatic actuators is directly related to the safe and stable operation of valves and the entire control system. However, in actual application, the medium transported by the valve often causes local heat transfer, resulting in a sharp increase in the temperature of the local area. When there are temperature-sensitive components such as rubber seals in the pneumatic actuator, the high temperature environment will seriously affect the durability of the seals and the overall working reliability, and may even cause the failure of the device.

[0003] At present, in order to deal with this local temperature rise problem, some traditional designs have adopted structural extension or added isolation devices to improve the temperature rise situation. However, these improvement measures often significantly increase the volume and overall size of the pneumatic actuator, thereby affecting the flexibility of the equipment in installation and spatial layout. In addition, this complex structure also makes it difficult to ensure that the pneumatic actuator can maintain a stable and reliable working state under long-term high temperature conditions, thereby limiting its application range in high temperature or strong heat conduction environments. Summary of the invention

[0004] To this end, the present invention provides a cooling structure for a pneumatic actuator, which can not only perform real-time temperature detection on key components of the pneumatic actuator such as the push rod that are easily affected by temperature rise due to heat conduction, but also achieve effective temperature control and temperature reduction regulation, while achieving a compact structure while maintaining performance.

[0005] In order to solve the above technical problems, the present invention provides a cooling structure for a pneumatic actuator, wherein the pneumatic actuator comprises a cylinder cover and a push rod passing through and extending along the cylinder cover, and the cooling structure comprises: A mounting body, arranged on the end surface of the cylinder cover; An air inlet cavity is arranged in the mounting body and is annularly arranged, wherein the air inlet cavity is provided with an air inlet for cooling gas to enter and a plurality of gas spray holes surrounding the push rod, and the air inlet extends along the axial direction of the push rod; A through channel, which passes through the mounting body, one end of which is in close contact with the end surface of the cylinder cover and is used for the push rod to pass through, and an air outlet is formed between the through channel and the push rod; The gas spray hole is connected to the air inlet cavity and the air outlet, and the cooling gas introduced through the air inlet can be blown toward the push rod surface through the gas spray hole and then discharged from the air outlet.

[0006] In one embodiment of the present invention, the gas spray hole is inclined toward the exhaust direction of the gas outlet.

[0007] In one embodiment of the present invention, the plurality of gas injection holes are evenly distributed along the circumference of the central axis of the push rod.

[0008] In one embodiment of the present invention, it also includes a bracket, a control device and an air source, the bracket is installed on the cylinder head, the control device and the air source are respectively installed on the bracket, the air source and the air inlet are connected by an air pipe, and an electromagnetic valve is connected between the control device and the air source.

[0009] In one embodiment of the present invention, it further includes a first temperature sensor electrically connected to the control device, wherein the first temperature sensor is installed between the cylinder head and the bracket and is used to detect the temperature of the cylinder head.

[0010] In one embodiment of the present invention, a second temperature sensor electrically connected to the control device is further included, and the second temperature sensor is mounted on the mounting body and is used to detect the temperature of the push rod.

[0011] In one embodiment of the present invention, the mounting body comprises a base connected to the cylinder head and a nozzle body mounted between the base and the cylinder head; The base includes a first disk body and a stepped groove is provided along the axial direction of the first disk body, wherein the stepped groove has a first step; The nozzle body includes a second disk body, a boss extending axially along the second disk body, and a second step formed between the boss and the disk body. The through channel is opened in the middle of the second disk body, and an annular groove is formed at the connection between the second disk body and the boss. The nozzle body extends into the stepped groove, and the first step and the second step abut against each other to close the annular groove and form the air inlet cavity. The air inlet is axially arranged on the first disk body.

[0012] In one embodiment of the present invention, the first step includes a first axial contact surface and a first radial contact surface, the second step includes a second axial contact surface and a second radial contact surface corresponding to the first axial contact surface and the first radial contact surface, a first sealing ring is arranged between the first axial contact surface and the second axial contact surface, a second sealing ring is arranged between the first radial contact surface and the second radial contact surface, and the first sealing ring and the second sealing ring are arranged adjacent to the air inlet cavity.

[0013] In one embodiment of the present invention, a mounting groove is provided on the axial end face of the second disk body close to the through channel, a mounting hole is provided on the mounting groove, a thermistor is installed on the mounting groove, a fixing screw for fixing the thermistor is installed in the mounting hole, and the detection end of the thermistor extends into the through channel and faces the push rod.

[0014] In one embodiment of the present invention, each of the gas injection holes is disposed through the common wall between the annular groove and the through channel.

[0015] The above technical solution of the present invention has the following advantages compared with the prior art: The cooling structure for a pneumatic actuator described in the present invention can achieve temperature control by installing a mounting body (including a base and a nozzle body) at the end of the cylinder head, and cooperating with a bracket, a control device, an air source, etc. The overall size is relatively compact, which will not have a significant impact on the original space layout, and is also convenient for more adaptation in industrial scenarios. By adding a compact cooling structure to the end face of the cylinder head, combining temperature sensors, control devices and compressed gas cooling, efficient cooling of key components of the pneumatic actuator is achieved, which can not only monitor and accurately control in real time, but also maintain a compact structure and easy maintenance, and has broad industrial application prospects.

[0016] The air intake chamber of the present invention is arranged in a ring shape, and multiple gas spray holes are distributed around the push rod, so that compressed air can be evenly sprayed onto the push rod surface from all sides to achieve rapid and effective cooling. The first temperature sensor and the second temperature sensor are arranged at key components such as the cylinder head and the push rod, which can monitor the temperature condition of the actuator in real time. When the temperature reaches or exceeds the preset threshold, the control device immediately takes cooling measures to effectively avoid problems such as aging, performance degradation and even failure of the seal caused by local overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of a cooling structure for a pneumatic actuator according to the present invention.

[0019] Figure 2 yes Figure 1 A partial enlarged schematic diagram of .

[0020] Figure 3 It is a schematic structural diagram of the nozzle body of the present invention.

[0021] Figure 4 It is a structural schematic diagram of the base of the present invention.

[0022] Description of the Figures in the Specification: 1. Pneumatic actuator; 11. Cylinder head; 12. Push rod; 2. Mounting body; 21. Air inlet cavity; 211. Air inlet; 22. Gas spray hole; 3. Bracket; 4. Control device; 41. First temperature sensor; 42. Second temperature sensor; 43. Air source; 44. Air pipe; 45. Solenoid valve; 46. Wire; 5. base; 51. first disk; 511. stepped groove; 512. first step; 512a. first axial contact surface; 512b. first radial contact surface; 6. Nozzle body; 61. Second disk body; 611. Mounting groove; 612. Fixing screw; 613. Mounting hole; 62. Boss; 63. Second step; 63a. Second axial contact surface; 63b. Second radial contact surface; 64. Through channel; 641. Air outlet; 65. Annular groove; 66. First sealing ring; 67. Second sealing ring. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0024] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0025] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0027] Reference Figure 1 , Figure 2 As shown, a cooling structure for a pneumatic actuator of the present invention, the pneumatic actuator 1 includes a cylinder head 11 and a push rod 12 passing through and extending along the cylinder head 11, and the cooling structure includes: The mounting body 2 is arranged on the end surface of the cylinder head 11; An air inlet cavity 21 is disposed in the mounting body 2 and is annularly arranged. The air inlet cavity 21 is provided with an air inlet 211 for cooling gas to pass through and a plurality of gas spray holes 22 surrounding the push rod 12. The air inlet 211 extends along the axial direction of the push rod 12. A through channel 64 passes through the mounting body 2, one end of the through channel 64 is closely attached to the end surface of the cylinder head 11 and is for the push rod 12 to pass through, and an air outlet 641 is formed between the through channel 64 and the push rod 12; The gas spray hole 22 is connected to the air inlet cavity 21 and the air outlet 641 , and the cooling gas (compressed gas) introduced through the air inlet 211 can be blown toward the surface of the push rod 12 through the gas spray hole 22 and then discharged from the air outlet 641 .

[0028] In one embodiment, the gas spray hole 22 is inclined toward the exhaust direction of the gas outlet 641, which optimizes the air flow channel and reduces energy consumption and gas waste while ensuring the cooling effect.

[0029] In one embodiment, the plurality of gas spray holes 22 are evenly distributed along the circumference of the central axis of the push rod 12. It should be noted that the number of gas spray holes 22, the air inlet 211, and the size of the gas spray holes 22 can also be designed and changed according to actual conditions. The air inlet cavity 21 is arranged in an annular shape, and a plurality of gas spray holes 22 are distributed around the push rod 12, so that the compressed air can be evenly sprayed onto the surface of the push rod 12 from all sides, achieving rapid and effective cooling.

[0030] In one embodiment, referring to Figure 1As shown, it also includes a bracket 3, a control device 4 and an air source 43. The bracket 3 is installed on the cylinder head 11, and the control device 4 and the air source 43 are respectively installed on the bracket 3. The air source 43 and the air inlet 211 are connected by an air pipe 44, and a solenoid valve 45 is connected between the control device 4 and the air source 43.

[0031] Specifically, it also includes a first temperature sensor 41 electrically connected to the control device 4 . The first temperature sensor 41 is installed between the cylinder head 11 and the bracket 3 to detect the temperature of the cylinder head 11 .

[0032] The device further comprises a second temperature sensor 42 electrically connected to the control device 4 . The second temperature sensor 42 is mounted on the mounting body 2 and is used to detect the temperature of the push rod 12 .

[0033] The first temperature sensor 41 and the second temperature sensor 42 are both connected to the control device 4 via a wire 46 .

[0034] The first temperature sensor 41 and the second temperature sensor 42 are thermal sensors. The first temperature sensor 41 is installed between the cylinder head 11 and the bracket 3, and the temperature collection is more accurate. When installed between the bracket 3 and the cylinder head 11, it does not occupy additional space and is not exposed to the outside environment, which also plays a certain protective role for the thermal sensor.

[0035] Exemplarily, the air source 43 adopts a compressed air tank. After receiving the relevant signal, the control device 4 controls the on and off of the compressed air delivery switch by transmitting the control signal to the solenoid valve 45. The control device 4 includes a relatively small control box, which can be fixed to the bracket 3 by magnetism or bolts, and the material can be plastic or stainless steel. A display screen is provided on the control box for real-time display of the temperature at the push rod 12 (and the cylinder head 11), and judging whether compressed air needs to be sprayed according to the current temperature. At the same time, a manual device (such as a button) is also provided so that the user can manually start the injection of compressed air when necessary; in addition, the data of the control box can be interconnected with a mobile phone to realize the remote control function. In the specific working process, the real-time temperature of the cylinder head 11 is collected by the first temperature sensor 41, and the real-time temperature of the push rod 12 is collected by the second temperature sensor 42. The temperature data collected by both are transmitted to the control device 4 via the wire 46. The control device 4 displays the received temperature data on the screen in real time. If the current temperature reaches the corresponding preset threshold, the control device 4 transmits a signal to the solenoid valve 45, so that the compressed air is delivered through the air inlet 211 of the base 5 and ejected through the gas nozzle 22 to directly cool the push rod 12.

[0036] The temperature condition of the actuator can be monitored in real time by arranging the first temperature sensor 41 and the second temperature sensor 42 at key components such as the cylinder head 11 and the push rod 12. When the temperature reaches or exceeds the preset threshold, the control device 4 immediately takes cooling measures to effectively avoid problems such as aging, performance degradation or even failure of the seal caused by local overheating.

[0037] In one embodiment, referring to Figure 3 , Figure 4 As shown, the mounting body 2 includes a base 5 connected to the cylinder head 11 by bolts and a nozzle body 6 installed between the base 5 and the cylinder head 11; The base 5 includes a first plate body 51 and a stepped groove 511 is provided along the axial direction of the first plate body 51 , wherein the stepped groove 511 has a first step 512 ; The nozzle body 6 includes a second disk body 61, a boss 62 extending axially along the second disk body 61, and a second step 63 formed between the boss 62 and the disk body. The second disk body 61 is provided with the through channel 64 in the middle portion. An annular groove 65 is formed at the connection between the second disk body 61 and the boss 62. The nozzle body 6 extends into the stepped groove 511. The first step 512 and the second step 63 abut against each other to close the annular groove 65 and form the air inlet cavity 21. The air inlet port 211 is axially arranged on the first disk body 51.

[0038] It should be noted that the split design of the installation body 2 improves the durability and stability of the overall structure, reduces the complexity of the structure, and facilitates installation and subsequent maintenance.

[0039] In one embodiment, the first step 512 includes a first axial contact surface 512a and a first radial contact surface 512b, the second step 63 includes a second axial contact surface 63a and a second radial contact surface 63b corresponding to the first axial contact surface 512a and the first radial contact surface 512b, a first sealing ring 66 is arranged between the first axial contact surface 512a and the second axial contact surface 63a, a second sealing ring 67 is arranged between the first radial contact surface 512b and the second radial contact surface 63b, and the first sealing ring 66 and the second sealing ring 67 are arranged adjacent to the air inlet cavity 21.

[0040] Between the first step 512 and the second step 63 at the junction of the base 5 and the nozzle body 6, the first sealing ring 66 and the second sealing ring 67 are used to achieve good sealing of the air inlet cavity 21, thereby preventing leakage of compressed air and ensuring the efficiency of cooling the compressed air. This not only greatly improves the gas utilization efficiency, but also forms a stable cooling air flow channel inside, reducing the risk and cost caused by leakage.

[0041] Specifically, the second disk body 61 is provided with a mounting groove 611 on the axial end surface close to the through-channel 64, the mounting groove 611 is provided with a mounting hole 613, a thermal sensor (i.e., the second temperature sensor 42) is installed on the mounting groove 611, a fixing screw 612 for fixing the thermal sensor is installed on the mounting hole 613, and the detection end of the thermal sensor extends into the through-channel 64 and faces the push rod 12. The second temperature sensor 42 is close to the push rod 12 of the actuator, so as to accurately measure the temperature of the actuator push rod 12 and feedback the signal in time.

[0042] In one embodiment, referring to Figure 3 As shown, each of the gas injection holes 22 is disposed through the common wall between the annular groove 65 and the through channel 64 .

[0043] The above-mentioned arrangement makes the structure for realizing temperature detection and cooling simple. The temperature of the push rod 12 can be accurately obtained through the feedback result of the thermistor sensor. The operation is simple, the required installation space is small, the overall size is relatively compact, and it will not cause a large impact on the original space layout. It is also convenient to make more adaptations in industrial scenarios, and it is easy to replace. The design and manufacturing cost is relatively low, and it can greatly improve the service life of the seal.

[0044] The cooling structure is mainly installed on the end face of the cylinder head 11 of the pneumatic actuator 1. The first temperature sensor 41 (installed between the cylinder head 11 and the bracket 3) is used to detect the temperature of the cylinder head 11; the second temperature sensor 42 (installed on the nozzle body 6 and facing the push rod 12) is used to detect the temperature of the push rod 12. In the industrial field, after the pneumatic actuator 1 starts to work, if the temperature of the conveying medium is high or it operates in a high temperature environment, the temperature of the cylinder head 11 and the push rod 12 will gradually rise.

[0045] The first temperature sensor 41 and the second temperature sensor 42 collect temperature data of the cylinder head 11 and the push rod 12 in real time, and transmit the signal to the control device 4 .

[0046] The control device 4 receives and processes the temperature data from the sensor, displays it on the display screen of the control box in real time, and compares it with the set temperature threshold.

[0047] When the temperature at one (or two) of the locations exceeds a preset threshold, the control device 4 will send an opening signal to the solenoid valve 45 to connect the compressed air pipe 44 .

[0048] After the solenoid valve 45 is opened, the air source 43 delivers the compressed air to the air inlet 211 on the base 5 through the air pipe 44 .

[0049] The compressed air is sprayed toward the push rod 12 from all sides through the gas spray holes 22 , so that the surface of the push rod 12 is quickly cooled, and then the cooled hot air is discharged from the air outlet 641 between the through channel 64 and the push rod 12 .

[0050] Under the continuous injection of compressed air, the temperature of the push rod 12 (and the temperature of the cylinder head 11) will gradually decrease. At this time, the sensor continues to feed back the current temperature information to the control device 4.

[0051] If the temperature drops to a safe range or is lower than the temperature threshold, the control device 4 will send a closing signal to the solenoid valve 45 to stop the input of compressed air, thereby realizing automated and energy-saving temperature reduction control.

[0052] If the temperature still does not reach the ideal range, the control device 4 will continue to keep the solenoid valve 45 in the open state, prolonging the injection time until the temperature drops below the set value and then stops the injection.

[0053] Users can also use the manual button on the control box to forcibly turn on or off the cooling spray to deal with emergencies or emergency measures. The control box can also be connected to a mobile phone or other remote control terminal, and users can also view the temperature data of the actuator in real time at the remote end and control the spray switch, further improving the level of industrial automation and intelligence.

[0054] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A cooling structure for a pneumatic actuator, the pneumatic actuator (1) comprising a cylinder head (11) and a push rod (12) passing through and extending along the cylinder head (11), characterized in that: The cooling structure comprises: A mounting body (2) disposed on an end surface of the cylinder cover (11); An air intake cavity (21) is arranged in the mounting body (2) and is arranged in an annular shape, the air intake cavity (21) is provided with an air intake port (211) for cooling gas to enter and a plurality of gas spray holes (22) surrounding the push rod (12), the air intake port (211) extending in the axial direction of the push rod (12); A through channel (64) passes through the mounting body (2), one end of the through channel (64) is in close contact with the end surface of the cylinder cover (11) and is for the push rod (12) to pass through, and an air outlet (641) is formed between the through channel (64) and the push rod (12); The gas spray hole (22) is connected to the air inlet cavity (21) and the air outlet (641), and the cooling gas introduced through the air inlet (211) can be blown toward the surface of the push rod (12) through the gas spray hole (22) and then discharged from the air outlet (641).

2. A cooling structure for a pneumatic actuator according to claim 1, characterized in that: The gas spray hole (22) is inclined toward the exhaust direction of the gas outlet (641).

3. A cooling structure for a pneumatic actuator according to claim 1, characterized in that: The plurality of gas injection holes (22) are evenly distributed along the circumference of the central axis of the push rod (12).

4. A cooling structure for a pneumatic actuator according to claim 1, characterized in that: It also includes a bracket (3), a control device (4) and an air source (43), wherein the bracket (3) is mounted on the cylinder head (11), the control device (4) and the air source (43) are respectively mounted on the bracket (3), an air pipe (44) is connected between the air source (43) and the air inlet (211), and an electromagnetic valve (45) is connected between the control device (4) and the air source (43).

5. A cooling structure for a pneumatic actuator according to claim 4, characterized in that: It also includes a first temperature sensor (41) electrically connected to the control device (4), wherein the first temperature sensor (41) is installed between the cylinder head (11) and the bracket (3) and is used to detect the temperature of the cylinder head (11).

6. A cooling structure for a pneumatic actuator according to claim 4, characterized in that: It also includes a second temperature sensor (42) electrically connected to the control device (4), wherein the second temperature sensor (42) is mounted on the mounting body (2) and is used to detect the temperature of the push rod (12).

7. A cooling structure for a pneumatic actuator according to claim 1, characterized in that: The mounting body (2) comprises a base (5) connected to the cylinder head (11) and a nozzle body (6) mounted between the base (5) and the cylinder head (11); The base (5) comprises a first disk body (51) and a stepped groove (511) is provided axially along the first disk body (51), wherein the stepped groove (511) has a first step (512); The nozzle body (6) comprises a second disk body (61), a boss (62) extending axially along the second disk body (61), and a second step (63) formed between the boss (62) and the disk body; the through channel (64) is provided in the middle of the second disk body (61); an annular groove (65) is formed at the connection between the second disk body (61) and the boss (62); the nozzle body (6) extends into the stepped groove (511); the first step (512) and the second step (63) abut against each other to close the annular groove (65) and form the air inlet cavity (21); and the air inlet port (211) is axially arranged on the first disk body (51).

8. A cooling structure for a pneumatic actuator according to claim 7, characterized in that: The first step (512) comprises a first axial contact surface (512a) and a first radial contact surface (512b); the second step (63) comprises a second axial contact surface (63a) and a second radial contact surface (63b) corresponding to the first axial contact surface (512a) and the first radial contact surface (512b); a first sealing ring (66) is arranged between the first axial contact surface (512a) and the second axial contact surface (63a); a second sealing ring (67) is arranged between the first radial contact surface (512b) and the second radial contact surface (63b); and the first sealing ring (66) and the second sealing ring (67) are arranged adjacent to the air inlet cavity (21).

9. A cooling structure for a pneumatic actuator according to claim 7, characterized in that: The second disk body (61) is provided with a mounting groove (611) on an axial end surface close to the through-channel (64), the mounting groove (611) is provided with a mounting hole (613), a thermal sensor is mounted on the mounting groove (611), and a fixing screw (612) for fixing the thermal sensor is mounted on the mounting hole (613), and a detection end of the thermal sensor extends into the through-channel (64) and faces the push rod (12).

10. A cooling structure for a pneumatic actuator according to claim 7, characterized in that: Each of the gas injection holes (22) is arranged through the common wall between the annular groove (65) and the through channel (64).

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