Explosion-proof electronic expansion valve

Abstract

The utility model relates to the technical field of electronic expansion valves, in particular to an explosion-proof electronic expansion valve. According to the technical scheme, the electronic expansion valve is an electronic expansion valve actuator, the electronic expansion valve actuator comprises a valve body and further comprises a speed reduction transmission device installed on the valve body, an explosion-proof chamber is installed at the top end of the speed reduction transmission device, a liquid viewing mirror is arranged on one side of the speed reduction transmission device, and the liquid viewing mirror and the valve body are installed in a matched mode. The valve body comprises a main body, a refrigerant inlet and a refrigerant outlet are formed in the two ends of the main body respectively, a through-flow sealing face is arranged in the main body, and one end of the speed reduction transmission device is connected with a valve needle installed in the valve body. The expansion valve can adapt to a high-gas environment under an explosive mine, the response speed is high, remote adjustment of a superheat degree set value can be achieved, the flow adjustment range is large, the requirement for large-range flow adjustment can be met, the control precision is high, and energy loss in the start-stop process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, in particular to an explosion-proof electronic expansion valve. Background Technique

[0002] An expansion valve is a throttling control element in a refrigeration device. It forms a closed refrigerant circulation system with a compressor, a condenser, and an evaporator, and is thus called one of the four key components of a refrigeration device. Generally, a thermal expansion valve is used for the expansion valve. This type of expansion valve has disadvantages such as a small control range, slow signal response, low control accuracy, narrow adjustment range, long lag time, and large error, which greatly limit its application in refrigeration units. Especially for large refrigeration units above 1 MW, it is very difficult to find a thermal expansion valve that matches its power.

[0003] Compared with a thermal expansion valve, an electronic expansion valve has very significant advantages: high adjustment accuracy, large adjustment range, fast adaptation to load and operating condition changes; particularly importantly, the adjustment oscillation of the electronic expansion valve is small, it can accurately control the superheat degree, and can keep the evaporator at a very small superheat degree within a wide range of operating conditions, making full use of the heat transfer area of the evaporator and having an obvious energy-saving effect.

[0004] The electronic expansion valve provides conditions for the intelligent control of refrigeration devices. It uses the electrical signals generated by the designed parameters to control the voltage or current applied to the expansion valve, and then adjusts the opening degree of the expansion valve to effectively control the liquid supply to the evaporator. In mine excavation operations, heat hazards in mines prompt us to study cooling equipment suitable for use in coal mines. Therefore, this application proposes an explosion-proof electronic expansion valve suitable for high-temperature heat hazard wells. Summary of the Invention

[0005] The purpose of the utility model is to address the problems in the background technique and propose an explosion-proof electronic expansion valve suitable for high-temperature heat hazard wells.

[0006] The technical solution of the utility model: An explosion-proof electronic expansion valve, the electronic expansion valve is an electronic expansion valve actuator, the electronic expansion valve actuator includes a valve body, and further includes a speed reduction transmission device installed on the valve body. An explosion-proof chamber is installed at the top end of the speed reduction transmission device, and a liquid sight glass is arranged on one side of the speed reduction transmission device. The liquid sight glass is installed in cooperation with the valve body;

[0007] The valve body includes a main body. Refrigerant inlets and refrigerant outlets are respectively arranged at both ends of the main body. A flow-through sealing surface is provided in the main body. One end of the speed reduction transmission device is connected to a valve needle installed in the valve body;

[0008] The explosion-proof chamber includes an explosion-proof housing, in which a stepper motor and an explosion-proof flange are installed. A transmission shaft is further provided inside the explosion-proof flange. An explosion-proof surface is provided between the explosion-proof flange and the transmission shaft. A second pinion is sleeved and installed on the outer ring of one end of the transmission shaft, and a first pinion is connected to the other end. An explosion-proof cable introducing device is installed at one end of the explosion-proof housing.

[0009] The speed reduction and transmission device includes a transmission frame, in which a transmission screw is installed. A guide sleeve is sleeved on the outer ring of the transmission screw. A large gear is installed at one end of the transmission screw. A connecting gear is provided on one side of the large gear, and a gear installation shaft is provided inside the connecting gear.

[0010] The valve needle includes a guide cylinder that is installed in cooperation with the guide sleeve. A guide frame is further provided on the outer ring of the guide cylinder. A conical sealing surface is provided at one end of the guide cylinder.

[0011] Optionally, fixing screw holes for integrally fixing and installing the valve body are provided at the bottom of the main body.

[0012] Optionally, an internal gear is sleeved and installed on the outer ring of the first pinion, and a first bearing is further sleeved on the outer ring of the transmission shaft. The first bearing is installed in cooperation with the explosion-proof flange.

[0013] Optionally, a second O-ring seal is provided on the inner ring at one end of the explosion-proof housing away from the explosion-proof cable introducing device.

[0014] Optionally, a second bearing sleeved on the outer ring of the transmission screw is installed in the transmission frame. A compression nut is provided on one side of the second bearing. A fastening screw is provided at one end of the transmission screw for installing the large gear.

[0015] Optionally, a transmission nut is further installed inside the guide cylinder.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] The explosion-proof electronic expansion valve of the present utility model adjusts the liquid supply amount of the evaporator according to a preset program, adapts to the development requirements of the mechatronics of refrigeration equipment in coal mines, has excellent characteristics that cannot be compared with thermal expansion valves, provides conditions for the intelligent control of the refrigeration system, and is a self-control component with great development prospects.

[0018] The present utility model enables the expansion valve to adapt to the high-gas environment in explosion-proof mine shafts, has a fast response speed, can realize the remote adjustment of the superheat setting value, has a large flow adjustment range, can adapt to the requirements of large-range flow adjustment, has high control accuracy, and reduces the energy loss during the start-stop process. Description of the Drawings

[0019] Figure 1 Provide a main schematic diagram of the utility model;

[0020] Figure 2 A front view structural schematic diagram of the utility model is given;

[0021] Figure 3 It is a structural schematic diagram of the valve body;

[0022] Figure 4 It is the structural schematic diagram of the explosion-proof chamber;

[0023] Figure 5 It is a structural schematic diagram of a reduction transmission device;

[0024] Figure 6 is a side view of the valve needle;

[0025] Figure 7 It is a front view schematic diagram of the valve needle.

[0026] 1. Valve body; 2. Flameproof chamber; 3. Flameproof cable lead-in device; 4. Flameproof housing; 5. Stepper motor; 6. First pinion gear; 7. Internal gear; 8. Flameproof flange; 9. Flameproof surface; 10. Transmission shaft; 11. Second pinion gear; 12. First bearing; 13. Second O-ring; 14. Refrigerant outlet; 15. Flow sealing surface; 16. Fixing screw hole; 17. First O-ring; 18. Flameproof chamber; 19. Flameproof cable lead-in device; 20. Flameproof housing; 21. Stepper motor; 22. First pinion gear; 23. Internal gear; 24. Flameproof flange; 25. Flameproof surface; 26. Transmission shaft; 27. Transmission shaft; 28. Second pinion gear; 29. ​​First bearing; 210. Second O-ring; 3. Reduction transmission device; 31. Transmission frame; 32. Guide sleeve; 33. Transmission screw; 34. Pressing nut; 35. Second bearing; 36. Fastening screw; 37. Large gear; 38. Gear mounting shaft; 39. Conical gear; 4. Valve needle; 41. Guide cylinder; 42. Conical sealing surface; 43. Guide frame; 44. Transmission nut; 5. Sight glass. DETAILED DESCRIPTION

[0027] The technical solution of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0028] The components of the embodiments of the present disclosure generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the present disclosure claimed, but merely represents selected embodiments of the present disclosure.

[0029] Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present disclosure.

[0030] In the description of the present disclosure, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present disclosure. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present disclosure, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0032] Embodiment

[0033] As Figures 1-6 shown, a flameproof electronic expansion valve proposed by the present utility model, the electronic expansion valve actuator includes a valve body 1, and further includes a speed reduction and transmission device 3 installed on the valve body 1. A flameproof chamber 2 is installed at the top end of the speed reduction and transmission device 3. A liquid sight glass 5 is arranged on one side of the speed reduction and transmission device 3, and the liquid sight glass 5 is installed in cooperation with the valve body 1;

[0034] The valve body 1 includes a main body 11. Fixing screw holes 15 for fixedly installing the whole valve body 1 are opened at the bottom of the main body 11. A refrigerant inlet 12 and a refrigerant outlet 13 are respectively arranged at both ends of the main body 11. A flow-through sealing surface 14 cooperating with the valve needle 4 is opened in the main body 11; the valve body 1 is the main mechanical carrier of the flameproof electronic expansion valve. The valve body 1, the flameproof chamber 2, the speed reduction and transmission device 3, the valve needle 4 and the liquid sight glass 5 are connected into a whole by means of group welding.

[0035] The flameproof chamber 2 includes a flameproof housing 21, in which a stepper motor 22 and a flameproof flange 25 are installed, a transmission shaft 27 is also arranged in the flameproof flange 25, an outer ring of the first pinion 23 is sleeved with an inner gear 24, an outer ring of the transmission shaft 27 is also sleeved with a first bearing 29, the first bearing 29 is installed in cooperation with the flameproof flange 25, a flameproof surface 26 is arranged between the flameproof flange 25 and the transmission shaft 27, a second pinion 28 is sleeved with an outer ring at one end of the transmission shaft 27, and the other end is connected to the first pinion 23, an explosion-proof cable introduction device 20 is installed at one end of the flameproof housing 21, and a second O-ring seal is arranged at the inner ring of the end of the flameproof housing 21 away from the explosion-proof cable introduction device 20 Sealing ring 210; the flameproof chamber 2 is the driving part of the entire flameproof electronic expansion valve. The gap between the first pinion 23 and the transmission shaft 27 is a flameproof surface 26 that meets the safety standards. Under the protection of this flameproof surface 26, when the spark generated by the stepper motor 22 at work ignites the gas entering the flameproof chamber 2 from the external environment and an explosion occurs, the environment containing gas outside the flameproof chamber 2 will not cause an explosive hazard. Through the arrangement of the first pinion 23, the second pinion 28 and the transmission shaft 27, the rotational motion of the first pinion 23 can be transmitted to the reduction transmission device 3. The explosion-proof cable introduction device 20 is a special device that meets the safety standards. The cable can be easily introduced into the flameproof chamber 2 through this device.

[0036] The reduction transmission device 3 includes a transmission frame 31, in which a transmission screw 33 is installed, and the outer ring of the transmission screw 33 is sleeved with a guide sleeve 32, and a large gear 37 is installed at one end of the transmission screw 33. The outer ring of the transmission screw 33 is also sleeved with a second bearing 35 installed in the transmission frame 31, and a clamping nut 34 is provided on one side of the second bearing 35. A fastening screw 36 is provided at one end of the transmission screw 33 for installing the large gear 37, and a conjoined gear 39 is provided on one side of the large gear 37, and a gear installation shaft 38 is provided in the conjoined gear 39; through the deceleration of the conjoined gear 39 and the large gear 37, the rotational motion of the first pinion 23 and the second pinion 28 in the explosion-proof chamber 2 can be transmitted to the transmission screw 33, so that the transmission screw 33 rotates under the drive of the stepper motor 22.

[0037] The valve needle 4 includes a guide cylinder 41 that is installed in mutual cooperation with the guide sleeve 32. A transmission nut 44 is also installed inside the guide cylinder 41. A guide frame 43 is provided on the outer circle of the guide cylinder 41. One end of the guide cylinder 41 is provided with a conical sealing surface 42. The valve needle 4 is a mechanism for adjusting the actual flow area of the valve body 1 during the operation of the expansion valve. By changing the actual flow area of the valve body 1, the flow rate of the refrigerant is adjusted. When the expansion valve is operating, the rotational motion of the transmission screw 33 of the speed reduction transmission device 3 causes the transmission nut 44 to perform a linear motion of rising or falling, driving the entire valve needle 4 to perform a linear motion of rising or falling in the cavity of the valve body 1. Under the action of the conical sealing surface 42 at the end of the valve needle 4, the actual flow area of the valve port changes to increase or decrease, achieving the purpose of adjusting the flow rate of the refrigerant passing through the expansion valve.

[0038] During installation, the guide frame 43 of the valve needle 4 is inserted into the groove on the cavity wall of the valve body 1 to prevent the valve needle 4 from rotating in the cavity of the valve body 1 during operation, enabling the rotational motion of the transmission nut 44 to be converted into a linear motion of the valve needle 4. The guide cylinder 41 of the valve needle 4 cooperates with the guide sleeve 32 of the speed reduction transmission device 3, making the linear motion of the valve needle 4 up or down in the cavity of the valve body 1 more stable and ensuring the accuracy of flow rate adjustment.

[0039] The pulse motor in the expansion valve operates under the control of a preset program and transmits torque to the reduction gear set. The reduction gear set then transmits the torque to the transmission screw. The rotational motion of the transmission screw drives the transmission nut that cooperates with it to perform a linear motion up and down. The up and down linear motion of the transmission nut drives the valve needle connected to it to perform a linear motion up and down, and the flow area of the valve port is adjusted through the conical sealing surface at the end of the valve needle, thereby achieving the adjustment of the flow rate of the refrigerant flowing through the expansion valve. By adjusting the flow rate of the refrigerant flowing through the expansion valve, the amount of refrigerant flowing into the evaporator can be adjusted, ensuring that the most suitable refrigerant is supplied to the evaporator, controlling the superheat at the outlet of the evaporator within a reasonable range, making full use of the heat exchange area of the evaporator, and ensuring the safe and stable operation of the refrigeration system.

[0040] The above specific embodiments are merely several alternative embodiments of the present utility model. Based on the technical solution of the present utility model and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An explosion-proof electronic expansion valve, the electronic expansion valve being an electronic expansion valve actuator, the electronic expansion valve actuator comprising a valve body (1), characterized in that: It further includes a speed reduction and transmission device (3) installed on the valve body (1). An explosion-proof chamber (2) is installed at the top end of the speed reduction and transmission device (3). A liquid sight glass (5) is arranged on one side of the speed reduction and transmission device (3), and the liquid sight glass (5) is installed in cooperation with the valve body (1). The valve body (1) includes a main body (11). A refrigerant inlet (12) and a refrigerant outlet (13) are respectively arranged at both ends of the main body (11). A flow-through sealing surface (14) is provided in the main body (11). One end of the speed reduction and transmission device (3) is connected to a valve needle (4) installed in the valve body (1). The explosion-proof chamber (2) includes an explosion-proof housing (21). A stepping motor (22) and an explosion-proof flange (25) are installed in the explosion-proof housing (21). A transmission shaft (27) is further arranged in the explosion-proof flange (25). An explosion-proof surface (26) is arranged between the explosion-proof flange (25) and the transmission shaft (27). A second small gear (28) is sleeved and installed on the outer circle of one end of the transmission shaft (27), and a first small gear (23) is connected to the other end. An explosion-proof cable introducing device (20) is installed at one end of the explosion-proof housing (21). The speed reduction and transmission device (3) includes a transmission frame (31). A transmission screw (33) is installed in the transmission frame (31). A guide sleeve (32) is sleeved on the outer circle of the transmission screw (33). A large gear (37) is installed at one end of the transmission screw (33). A connecting gear (39) is arranged on one side of the large gear (37), and a gear mounting shaft (38) is arranged in the connecting gear (39). The valve needle (4) includes a guide cylinder (41) installed in cooperation with the guide sleeve (32). A guide frame (43) is further arranged on the outer circle of the guide cylinder (41). A conical sealing surface (42) is arranged at one end of the guide cylinder (41).

2. The explosion-proof electronic expansion valve according to claim 1, wherein Fixing screw holes (15) for integrally fixing the valve body (1) are provided at the bottom of the main body (11).

3. An explosion-proof electronic expansion valve according to claim 1, characterized in that, An internal gear (24) is sleeved and installed on the outer circle of the first small gear (23). A first bearing (29) is also sleeved on the outer circle of the transmission shaft (27), and the first bearing (29) is installed in cooperation with the explosion-proof flange (25).

4. An explosion-proof electronic expansion valve according to claim 1, characterized in that, A second O-ring (210) is arranged on the inner circle at one end of the explosion-proof housing (21) away from the explosion-proof cable introducing device (20).

5. An explosion-proof electronic expansion valve according to claim 1, characterized in that, A second bearing (35) is sleeved on the outer circle of the transmission screw (33) and installed in the transmission frame (31). A compression nut (34) is arranged on one side of the second bearing (35). A fastening screw (36) is arranged at one end of the transmission screw (33) for installing the large gear (37).

6. The explosion-proof electronic expansion valve according to claim 1, wherein, A transmission nut (44) is further installed inside the guide cylinder (41).

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