Low-temperature positive pressure control equipment

Abstract

The utility model discloses low-temperature positive pressure control equipment, and particularly relates to the technical field of pneumatic control, the low-temperature positive pressure control equipment comprises an equipment body and further comprises a fixing mechanism, the equipment body comprises a fixing shell, one end of the fixing shell is provided with a compressed air inlet connector, and the air outlet end of the compressed air inlet connector is provided with a filtering pressure reducing valve; a flow regulating valve is mounted at the air outlet end of the filtering pressure reducing valve, a compressed air outlet connector is mounted at the air outlet end of the flow regulating valve, an anti-explosion electric heater is mounted at the bottom of the inner side of the fixing shell, the fixing mechanism comprises a regulating screw, a storage plate is arranged on the outer side of the regulating screw, and a fixing plate is mounted on the inner side of the storage plate. A constant temperature can be provided for the positive pressure control equipment through the anti-explosion electric heater and the heat preservation cotton, the horizontal position of the fixing plate can be adjusted by rotating the adjusting screw rod, and the equipment body can adapt to installation work of different installation parts.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic control, in particular to a low-temperature positive pressure control device. Background Art

[0002] Positive pressure electrical equipment is live equipment used in explosive places. In some industrial places such as petroleum, petrochemical, chemical, steel, etc., dangerous explosive gases will be released during the processing and production process. If electrical equipment is used in places containing explosive gases, electrical equipment with gas explosion-proof function must be used. The explosion-proof principle of positive pressure electrical equipment is to introduce fresh air or inert gas at a certain pressure into the casing of the equipment to replace the dangerous gas in the inner cavity. After the replacement is completed, fresh air or inert gas at a certain pressure is continued to be introduced to prevent the surrounding flammable gas from entering the inside of the casing, thereby preventing the ignition source from contacting the explosive gas and achieving the purpose of preventing explosion. The key measure of positive pressure electrical equipment is that the pressure of the protective gas (fresh air or inert gas) inside the equipment casing is at least 50Pa higher than the pressure of the environment.

[0003] Deficiencies in the existing technology: Existing positive pressure control devices are suitable for use in environments between -20°C and +50°C. When operating in low-temperature environments, the lower the temperature, especially below -20°C, the more likely water vapor in the compressed air will condense. During use, when the compressed air is released from the discharge port, the pressure suddenly drops, the volume expands, and the temperature drops, causing the water vapor in the compressed air to further condense into water. This condensed water accelerates wear on valves in the air circuit and equipment, causing failure or malfunction of pneumatic control equipment. It can also cause rust in the air circuit and pneumatic equipment. If water accumulates and freezes at low points in the air circuit, there is a risk of the air circuit bursting. Utility Model Content

[0004] To this end, the utility model provides a low-temperature positive pressure control device to solve the problem in the prior art that the device cannot adapt to installation work in different positions due to the lack of a heating structure and the inability to adjust the fixed structure, making the device easily damaged in a low-temperature environment.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-temperature positive pressure control device, comprising a device body, and further comprising:

[0006] The junction box is fixedly installed at the bottom of the device body and is used to connect to the cables;

[0007] Explosion-proof cable gland, installed at the bottom of the junction box, used to connect the cable to the junction box;

[0008] There are four fixing mechanisms, which are respectively arranged at the top and bottom ends of the outer wall of one side of the device body, for installing and fixing the device body;

[0009] The device body includes a fixed shell, a compressed air inlet interface is fixedly installed on the inner wall of one end of the fixed shell, a filter pressure reducing valve is installed at the outlet end of the compressed air inlet interface, a flow regulating valve is installed at one outlet end of the filter pressure reducing valve, and a compressed air outlet interface is installed at the outlet end of the flow regulating valve, the inner wall of the fixed shell is paved with thermal insulation cotton, and an explosion-proof electric heater is fixedly installed at the inner bottom of the fixed shell;

[0010] The fixing mechanism includes an adjusting screw, which is arranged on the inner wall of one side of the fixed shell. A storage plate is provided on the outer side of the adjusting screw. A fixing plate is movably installed on the inner side of the storage plate. Fixing pins are provided between both ends of the fixing plate and the storage plate.

[0011] Preferably, an alarm indicator light is provided on the outer wall of one side of the fixed shell, an observation window is fixedly installed on one end of the alarm indicator light, and a pressure detection point is provided on the bottom of the outer wall of one end of the fixed shell close to the compressed air inlet interface.

[0012] Preferably, a control component is provided at one end of the bottom inner side of the fixed shell away from the explosion-proof electric heater, an alarm switch is provided at the bottom of one end of the control component, a pressure sensor is provided on one side of the outer wall of the control component, and mounting grooves are provided at both ends of the top and bottom of the outer wall of the side of the fixed shell away from the alarm indicator light.

[0013] Preferably, the inner wall of the installation groove is rotatably connected to the adjacent adjusting screw, the outer wall of the adjusting screw is threadedly sleeved with a movable seat, and the inner wall of the installation groove is movably connected to the outer wall of the adjacent movable seat.

[0014] Preferably, the outer wall of the movable seat on one side away from the fixed shell is fixedly connected to the receiving plate, and movable grooves are formed on the inner walls at both ends of the receiving plate.

[0015] Preferably, sliders are fixedly mounted on the bottom of the outer walls at both ends of the fixed plate, and the outer walls of the sliders are movably connected to the inner walls of the adjacent movable grooves.

[0016] Preferably, fixing holes are provided at both ends of the top of the outer wall of one side of the storage plate, the inner wall of the fixing hole is threadedly connected to the outer wall of the adjacent fixing pin, and the side of the fixing pin away from the fixing hole is threadedly connected to the inner wall of the adjacent slider.

[0017] Preferably, the outer wall of the head portion of the adjusting screw is in the same vertical plane as the outer wall of the fixed shell, and the end surface of the receiving plate away from the movable seat is in the same horizontal plane as the adjacent outer wall of the fixed shell.

[0018] The embodiment of the utility model has the following advantages:

[0019] 1. The utility model can control the internal temperature of the fixed shell through the thermostatic controller of the explosion-proof electric heater, and at the same time, the internal environment of the fixed shell can be insulated by the thermal insulation cotton, thereby providing a constant temperature inside the device body, so that the positive pressure control device can work stably in a low temperature environment, which can extend the service life of the positive pressure control device. At the same time, the fixed plate extends from the inside of the storage plate, and then the fixed plate can be fixed by a fixed pin passing through the fixed hole and leveling with the inner wall thread of the slider, and then the movable seat is moved on its outside by adjusting the screw, and the horizontal position of the fixed plate can be adjusted, so that the device body can adapt to the installation work of different installation parts, thereby improving the adaptability of the positive pressure control device;

[0020] 2. The utility model can limit the movement of the slider through the movable groove, so that the fixed plate remains stable during the storage or extension process, and can prevent it from deflecting. At the same time, the installation groove can limit the movement of the movable seat, so that the fixed plate remains stable during the horizontal adjustment process, and thus the equipment body can be stably connected and fixed to the installation part through the fixed plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0022] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0023] Figure 1 This is a front structural diagram of the present utility model;

[0024] Figure 2 This is a diagram of the internal structure of the device body of the utility model;

[0025] Figure 3 This is a rear perspective structural diagram of the present utility model;

[0026] Figure 4 This is a rear perspective structural diagram of the device body of the present invention;

[0027] Figure 5 This is an exploded view of the three-dimensional structure of the fixing mechanism of the present invention.

[0028] Figure: 1. Equipment body; 101. Fixed housing; 102. Compressed air inlet port; 103. Filter pressure reducing valve; 104. Flow control valve; 105. Compressed air outlet port; 106. Pressure detection point; 107. Insulation foam; 108. Explosion-proof electric heater; 109. Alarm switch; 110. Control unit; 111. Pressure sensor; 112. Mounting slot.

[0029] 2. Junction box; 3. Explosion-proof cable gland; 4. Alarm indicator light; 5. Observation window;

[0030] 6. Fixing mechanism; 601. Adjusting screw; 602. Movable seat; 603. Receiving plate; 604. Movable slot; 605. Fixing hole; 606. Fixing plate; 607. Slider; 608. Fixing pin. DETAILED DESCRIPTION

[0031] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0032] Refer to the instruction manual Figure 1 The low-temperature positive pressure control device of this embodiment includes a device body 1 and further includes:

[0033] The junction box 2 is fixedly mounted on the bottom of the device body 1 and is used to connect to the cables;

[0034] An explosion-proof cable gland 3 is installed at the bottom of the junction box 2 and is used to connect the cable to the junction box 2;

[0035] There are four fixing mechanisms 6 , and the four fixing mechanisms 6 are respectively arranged at the top and bottom ends of the outer wall of one side of the device body 1 , for installing and fixing the device body 1 .

[0036] In order to make the device body 1 work normally in a low temperature environment, Figure 1-2As shown, the device body 1 includes a fixed shell 101, and a compressed air inlet interface 102 is fixedly installed on the inner wall of one end of the fixed shell 101, and a filter pressure reducing valve 103 is installed at the outlet end of the compressed air inlet interface 102, and a flow regulating valve 104 is installed at one outlet end of the filter pressure reducing valve 103, and a compressed air outlet interface 105 is installed at the outlet end of the flow regulating valve 104. The inner wall of the fixed shell 101 is paved with thermal insulation cotton 107, and an explosion-proof electric heater 108 is fixedly installed on the inner bottom of the fixed shell 101. The explosion-proof electric heater 108 with its own constant temperature controller can control the ambient temperature inside the fixed shell 101, and the insulation cotton 107 can keep the inside of the fixed shell 101 warm, thereby providing a constant temperature to the inside of the fixed shell 101, so that the positive pressure control device can work stably in a low temperature environment, and the service life of the device body 1 can be extended.

[0037] In order to conveniently install and fix the device body 1, as Figure 3-5 As shown, the fixing mechanism 6 includes an adjusting screw 601, which is arranged on the inner wall of one side of the fixed shell 101, and a receiving plate 603 is arranged on the outside of the adjusting screw 601. A fixing plate 606 is movably installed on the inner side of the receiving plate 603, and fixing pins 608 are provided between both ends of the fixing plate 606 and the receiving plate 603. The fixing plate 606 can be moved along the inner wall of the receiving plate 603 and can be conveniently extended or stored. At the same time, the operation of the adjusting screw 601 can adjust the horizontal position of the fixing plate 606, so that the device body 1 can adapt to the installation work of different installation parts.

[0038] In order to conveniently control the operation of pneumatic components, such as Figure 1-3 As shown, an alarm indicator light 4 is provided on the outer wall of one side of the fixed shell 101, and an observation window 5 is fixedly installed on one end of the alarm indicator light 4. A pressure detection point 106 is provided on the bottom of the outer wall of the fixed shell 101 close to the compressed air inlet interface 102, and a control component 110 is provided on the end of the inner bottom of the fixed shell 101 away from the explosion-proof electric heater 108. An alarm switch 109 is provided on the bottom of one end of the control component 110, and a pressure sensor 111 is provided on the outer wall of one side of the control component 110. Mounting grooves 112 are provided at both ends of the top and bottom of the outer wall of the side of the fixed shell 101 away from the alarm indicator light 4. The pressure signal fed back from the inner cavity of the positive pressure shell passes through the pressure detection point 106 and is fed back to the pressure sensor 111. When the fed-back pressure value meets the sensor calibration value, the pressure sensor 111 outputs a gas signal to the alarm switch 109, and the passive switching signal of the switch enters the junction box 2, which can be used as a remote alarm signal contact.

[0039] In order to keep the fixing plate 606 stable during the horizontal adjustment process, Figure 3-5As shown, the inner wall of the mounting groove 112 is rotatably connected to the adjacent adjusting screw 601, and the outer wall of the adjusting screw 601 is threadedly sleeved with a movable seat 602. The inner wall of the mounting groove 112 is movably connected to the outer wall of the adjacent movable seat 602. The mounting groove 112 can install and fix the adjusting screw 601 and at the same time limit the movement of the movable seat 602, so that the fixed plate 606 remains stable during the horizontal adjustment process.

[0040] In order to conveniently extend or store the fixing plate 606, Figure 3 and Figure 5 As shown, the outer wall of the movable seat 602 away from the fixed shell 101 is fixedly connected to the storage plate 603, and movable grooves 604 are provided on the inner walls at both ends of the storage plate 603. Sliders 607 are fixedly installed on the bottom of the outer walls of both ends of the fixed plate 606. The outer walls of the sliders 607 are movably connected to the inner walls of the adjacent movable grooves 604. Fixing holes 605 are provided on the top two ends of the outer wall of one side of the storage plate 603. The inner walls of the fixing holes 605 are threadedly connected to the outer walls of the adjacent fixing pins 608. The side of the fixing pin 608 away from the fixing hole 605 is threadedly connected to the inner wall of the adjacent slider 607. The movable groove 604 can limit the movement of the slider 607, so that the fixed plate 606 remains stable during the movement. The fixing pin 608 passes through the fixing hole 605 and is threadedly connected to the inner wall of the adjacent slider 607 to fix the fixed plate 606, so that the device body 1 can be stably connected and fixed to the installation part through the fixing plate 606.

[0041] In order to prevent the fixing mechanism 6 from extending out from the outer wall of the device body 1 and causing damage, Figure 3-5 As shown, the outer wall of the screw head part of the adjusting screw 601 is in the same vertical plane as the outer wall of the fixed shell 101, the end surface of the storage plate 603 away from the movable seat 602 is in the same horizontal plane as the adjacent outer wall of the fixed shell 101, the screw head part of the adjusting screw 601 is in the same plane as the outer wall of the fixed shell 101, and the fixing plate 606 is in the same plane as the outer wall of the fixed shell 101 in the storage state, which can prevent the fixing mechanism 6 from extending from the inner wall of the fixed shell 101 and being damaged during transportation.

[0042] The specific implementation scenario is as follows: when installing and using the positive pressure control device, the fixed plate 606 is stretched outward to extend from the inside of the storage plate 603, and the movable groove 604 can limit the movement of the adjacent slider 607, so that the fixed plate 606 remains stable during the movement. After the fixed plate 606 extends from the inside of the storage plate 603, the fixed pin 608 is used to pass through the fixing hole 605 and be threadedly connected to the inner wall of the adjacent slider 607 to fix the fixed plate 606. Then, by rotating the adjusting screw 601, the movable seat 602 is moved along the inner wall of the adjacent installation groove 112 on its outside, and then the horizontal position of the device fixed plate 606 can be adjusted, and then the fixing mechanism 6 can be conveniently adjusted according to different installation locations, so that the device body 1 can adapt to the installation work of different installation locations.

[0043] The positive pressure protective gas source enters the filter pressure reducing valve 103 through the compressed air inlet interface 102, and then divides into two paths. One path passes through the flow regulating valve 104 and then enters the positive pressure shell through the compressed air outlet interface 105. The other path allows the compressed air as the working air source of the pneumatic components to pass through the control component 110 and enter the pressure sensor 111. At the same time, the pressure signal fed back from the inner cavity of the positive pressure shell passes through the pressure detection point 106 and is fed back to the pressure sensor 111. When the fed-back pressure value meets the sensor calibration value, the pressure sensor 111 outputs a gas signal to the alarm switch 109. The passive switching signal of the switch enters the junction box 2, which can be used as a remote alarm signal contact. When the temperature probe of the explosion-proof electric heater 108 monitors the ambient temperature in the fixed shell 101 When the temperature is lower than the low temperature value set by the explosion-proof electric heater 108, the heater automatically starts to increase the ambient temperature inside the fixed shell 101. After a period of heating, when the ambient temperature reaches the high temperature value of the explosion-proof electric heater 108, the heater stops working. After the above process is circulated, the ambient temperature inside the fixed shell 101 can be kept stable within a constant range. At the same time, the thermal insulation cotton 107 can insulate the internal environment of the fixed shell 101, thereby enabling the positive pressure control device to work stably in a low temperature environment, thereby improving the adaptability of the positive pressure control device and extending the service life of the positive pressure control device. This embodiment specifically solves the problem in the prior art that the positive pressure control device is easily damaged in a low temperature environment, which affects the working state and service life of the device.

[0044] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.

Claims

1. A low temperature positive pressure control device, comprising a device body (1), characterized in that: Also includes: A junction box (2) is fixedly mounted on the bottom of the device body (1) and is used for connecting to cables; An explosion-proof cable sealing joint (3), installed at the bottom of the junction box (2), for connecting the cable to the junction box (2); Four fixing mechanisms (6) are provided, and the four fixing mechanisms (6) are respectively provided at both ends of the top and bottom of the outer wall of one side of the device body (1), and are used to install and fix the device body (1); The device body (1) comprises a fixed shell (101), a compressed air inlet interface (102) is fixedly mounted on the inner wall of one end of the fixed shell (101), a filter pressure reducing valve (103) is mounted on the outlet end of the compressed air inlet interface (102), a flow regulating valve (104) is mounted on one outlet end of the filter pressure reducing valve (103), a compressed air outlet interface (105) is mounted on the outlet end of the flow regulating valve (104), the inner wall of the fixed shell (101) is paved with heat-insulating cotton (107), and an explosion-proof electric heater (108) is fixedly mounted on the inner bottom of the fixed shell (101); The fixing mechanism (6) comprises an adjusting screw (601), the adjusting screw (601) being arranged on the inner side of one side of the fixed housing (101), a receiving plate (603) being arranged on the outer side of the adjusting screw (601), a fixing plate (606) being movably mounted on the inner side of the receiving plate (603), and fixing pins (608) being arranged between both ends of the fixing plate (606) and the receiving plate (603).

2. The low-temperature positive pressure control device according to claim 1, characterized in that: An alarm indicator light (4) is provided on an outer wall of one side of the fixed housing (101), an observation window (5) is fixedly mounted on one end of the alarm indicator light (4), and a pressure detection point (106) is provided at the bottom of the outer wall of one end of the fixed housing (101) close to the compressed air inlet interface (102).

3. The low-temperature positive pressure control device according to claim 2, characterized in that: A control assembly (110) is provided at one end of the bottom inner side of the fixed housing (101) away from the explosion-proof electric heater (108), an alarm switch (109) is provided at the bottom of one end of the control assembly (110), a pressure sensor (111) is provided on one side of the outer wall of the control assembly (110), and mounting grooves (112) are provided at both ends of the top and bottom of the outer wall of the side of the fixed housing (101) away from the alarm indicator light (4).

4. The low-temperature positive pressure control device according to claim 3, characterized in that: The inner wall of the installation groove (112) is rotatably connected to the adjacent adjusting screw (601), the outer wall of the adjusting screw (601) is threadedly sleeved with a movable seat (602), and the inner wall of the installation groove (112) is movably connected to the outer wall of the adjacent movable seat (602).

5. The low-temperature positive pressure control device according to claim 4, characterized in that: The outer wall of one side of the movable seat (602) away from the fixed shell (101) is fixedly connected to the receiving plate (603), and the inner walls at both ends of the receiving plate (603) are provided with movable grooves (604).

6. The low-temperature positive pressure control device according to claim 5, characterized in that: Sliders (607) are fixedly mounted on the bottom of the outer walls at both ends of the fixed plate (606), and the outer walls of the slides (607) are movably connected to the inner walls of the adjacent movable grooves (604).

7. The low-temperature positive pressure control device according to claim 6, characterized in that: Both ends of the top of the outer wall of one side of the receiving plate (603) are provided with fixing holes (605), the inner wall of the fixing hole (605) is threadedly connected to the outer wall of the adjacent fixing pin (608), and the side of the fixing pin (608) away from the fixing hole (605) is threadedly connected to the inner wall of the adjacent slider (607).

8. The low-temperature positive pressure control device according to claim 5, characterized in that: The outer wall of the screw head portion of the adjusting screw (601) is in the same vertical plane as the outer wall of the fixed housing (101), and the end surface of the receiving plate (603) away from the movable seat (602) is in the same horizontal plane as the adjacent outer wall of the fixed housing (101).

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