Valve device, detection method thereof and air circulation refrigeration system

Abstract

The invention provides a valve device, a detection method thereof and an air circulation refrigeration system.The valve device comprises a first switch, an elastic component and a power mechanism, the first switch comprises a first switch body and a first pressing piece, and the first pressing piece is connected with the elastic component; when the elastic component is in an initial state, the first pressing sheet is in contact with the first contact of the first switch main body under the action of the elastic component; after the power mechanism drives the first pressing piece to be not in contact with the first contact, the elastic component is in a first deformation state. According to the valve device, when the full-closing or full-opening position indication of the valve device fails, after the power mechanism drives the first pressing piece to be not in contact with the first contact, the power mechanism still continuously drives the first pressing piece to move, and due to the fact that the elastic component is connected with the first pressing piece, the first pressing piece does not make contact with the first contact; therefore, when the power mechanism continuously drives the first pressing piece to move, rigid confrontation is not achieved, the power mechanism can be prevented from being blocked for a long time, and the power mechanism can be prevented from being burnt out due to heating.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air cycle refrigeration equipment, and particularly relates to a damper device, a detection method thereof and an air cycle refrigeration system. BACKGROUND

[0002] In the air cycle refrigeration system, the temperature control damper device valve plate can be used to control the air conditioning system outlet temperature. In important use scenarios, the damper device valve plate position detection is required. If the full-closing or full-opening position indication of the valve plate fails, the damper device will continuously perform the valve closing or opening action, which may cause the motor to be blocked for a long time, resulting in motor heating and burning. SUMMARY

[0003] Therefore, the present application provides a damper device, which can solve the technical problem that the existing damper device will continuously perform the valve closing or opening action after the full-closing or full-opening position indication fails, which may cause the motor to be blocked for a long time, resulting in motor heating and burning.

[0004] To solve the above problems, the present application provides a damper device, which comprises a first switch, an elastic component, a power mechanism and a valve plate. The first switch comprises a first switch body and a first pressing piece. The first switch body has a first contact point. The first pressing piece is connected with the elastic component. The power mechanism comprises a first contact head. The elastic component has an initial state. When the elastic component is in the initial state, the first pressing piece contacts the first contact point under the action of the elastic component to make the first switch in a conduction state. The elastic component also has a first deformed state. The power mechanism is configured to drive the valve plate to rotate. During the process of driving the valve plate to rotate, the first contact head can resist the first pressing piece and the first contact point to be not in contact to make the first switch in a disconnection state. The elastic component is in the first deformed state under the force from the power mechanism.

[0005] In some embodiments, the damper device further comprises a second switch. The second switch comprises a second switch body and a second pressing piece. The second switch body has a second contact point. The second pressing piece is connected with the elastic component. The power mechanism further comprises a second contact head. When the elastic component is in the initial state, the second pressing piece contacts the second contact point under the action of the elastic component to make the second switch in a conduction state. The elastic component also has a second deformed state. During the process of driving the valve plate to rotate, the second contact head can resist the second pressing piece and the second contact point to be not in contact to make the second switch in a disconnection state. The elastic component is in the second deformed state under the force from the power mechanism.

[0006] In some embodiments, the elastic component is a torsion spring, with the first pressure plate and the second pressure plate respectively connected to both sides of the torsion spring.

[0007] In some embodiments, the power mechanism further includes a motor, a worm gear, and a worm wheel, wherein the worm gear meshes with the worm wheel, the first contact and the second contact are both fixed on the worm wheel, and the motor is capable of driving the worm gear to rotate.

[0008] In some embodiments, the power mechanism further includes a first gear, a second gear, a connecting shaft, a third gear, and a fourth gear. The first gear is fixed on the output shaft of the motor, the second gear and the third gear are both fixed on the connecting shaft, the worm gear is fixed on the fourth gear, the first gear meshes with the second gear, the third gear meshes with the fourth gear, the diameter of the first gear is smaller than the diameter of the second gear, the diameter of the second gear is larger than the diameter of the third gear, and the diameter of the third gear is smaller than the diameter of the fourth gear.

[0009] The present invention also provides a detection method for the aforementioned valve device, wherein the valve device further includes a controller; one of the first switch and the second switch is used as feedback for the fully open position of the valve plate, and the other is used as feedback for the fully closed position of the valve plate; the detection method includes: during the process of the power mechanism driving the valve plate to fully close or fully open, acquiring the real-time angle of the valve plate and recording it as θ, and determining whether the fully closed or fully open end signal is abnormal based on the relationship between θ and a, b and the fully closed or fully open end signal received by the controller; wherein a is a first angle setting value, b is a second angle setting value, and a < b.

[0010] In some implementations, when θ < a and the controller receives a fully closed end signal, the fully closed end signal is determined to be abnormal; when θ ≥ b and the controller receives a fully open end signal, the fully open end signal is determined to be abnormal.

[0011] In some implementations, when a≤θ<b, the full-off end signal is determined to be abnormal based on the relationship between θ and c; where c is the third angle setting value, and a<c<b.

[0012] In some implementations, when θ > c, the all-off end signal is determined to be abnormal; when θ ≤ c, the all-off end signal is determined to be normal.

[0013] The present invention also provides an air circulation refrigeration system, including the aforementioned valve device.

[0014] The present invention provides a valve device and its detection method, as well as an air circulation refrigeration system, which have the following beneficial effects:

[0015] When the first switch of the valve device is used to provide feedback on either the fully closed or fully open position indication of the valve device, if the fully closed or fully open position indication fails, that is, if the valve device continues to perform valve closing or opening actions, causing the power mechanism to drive the first pressure plate to stop contacting the first contact point, but the power mechanism does not stop, but continues to drive the first pressure plate to move, then because the first pressure plate is connected to the elastic component, the elastic component can deform to provide a certain buffer space, so when the power mechanism continues to drive the first pressure plate to move, it is not a rigid resistance, thus preventing the power mechanism from being stuck for a long time, thereby avoiding the power mechanism from overheating and burning out. Attached Figure Description

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 This is a top view of the valve device according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Side view at point A;

[0019] Figure 3 for Figure 1 Side view at point B;

[0020] Figure 4 This is a schematic diagram of a valve device according to an embodiment of the present invention;

[0021] Figure 5 This is a flowchart illustrating the detection process of the valve device according to an embodiment of the present invention.

[0022] The reference numerals in the attached figures are as follows:

[0023] 1. First switch; 11. First switch body; 12. First pressure plate; 2. Elastic component; 3. Power mechanism; 31. First contact; 32. Second contact; 33. Motor; 34. Worm gear; 35. Worm wheel; 36. First gear; 37. Second gear; 38. Third gear; 39. Fourth gear; 4. Second switch; 41. Second switch body; 42. Second pressure plate; 5. Controller; 6. Valve plate; 7. Valve stem; 8. Support. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0026] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0027] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0028] See also Figures 1 to 5As shown, according to an embodiment of the present invention, a valve device is provided, including a first switch 1, an elastic component 2, a power mechanism 3, and a valve plate 6. The first switch 1 includes a first switch body 11 and a first pressure plate 12. The first switch body 11 has a first contact. The first pressure plate 12 is connected to the elastic component 2. The power mechanism 3 includes a first contact 31. The elastic component 2 has an initial state. When the elastic component 2 is in the initial state, the first pressure plate 12 contacts the first contact under the action of the elastic component 2 to make the first switch 1 in a conducting state. The elastic component 2 also has a first deformation state. The power mechanism 3 is configured to drive the valve plate 6 to rotate. During the process of the power mechanism 3 driving the valve plate 6 to rotate, the first contact 31 can abut against the first pressure plate 12 and not contact the first contact to make the first switch 1 in a disconnected state. The elastic component 2 is subjected to the force from the power mechanism 3 and is in the first deformation state.

[0029] In this technical solution, when the first switch 1 of the valve device is used to provide feedback on either the fully closed or fully open position indication of the valve device, if the fully closed or fully open position indication fails, that is, if the valve device continues to perform valve closing or opening actions, causing the power mechanism 3 to drive the first pressure plate 12 to stop contacting the first contact point, the power mechanism 3 does not stop, but continues to drive the first pressure plate 12 to move. Since the first pressure plate 12 is connected to the elastic component 2, the elastic component 2 can deform to provide a certain buffer space. Therefore, when the power mechanism 3 continuously drives the first pressure plate 12 to move, it is not a rigid resistance. Thus, it can prevent the power mechanism 3 from being stuck for a long time, thereby avoiding the power mechanism 3 from overheating and burning out.

[0030] See also Figure 1 and Figure 4 As shown, the power mechanism 3 also includes a motor 33, a worm 34, a worm wheel 35, a first gear 36, a second gear 37, a connecting shaft, a third gear 38, and a fourth gear 39. The first gear 36 is fixed on the output shaft of the motor 33, the second gear 37 and the third gear 38 are both fixed on the connecting shaft, the worm 34 is fixed on the fourth gear 39, the first gear 36 meshes with the second gear 37, the third gear 38 meshes with the fourth gear 39, the worm 34 meshes with the worm wheel 35, and the first contact 31 is fixed on the worm wheel 35. The diameter of the first gear 36 is smaller than the diameter of the second gear 37, the diameter of the second gear 37 is larger than the diameter of the third gear 38, and the diameter of the third gear 38 is smaller than the diameter of the fourth gear 39.

[0031] In this embodiment, when the motor 33 drives the first gear 36 to rotate, the first gear 36 drives the second gear 37 to rotate. Simultaneously, the second gear 37 drives the third gear 38 to rotate synchronously via the connecting shaft. The third gear 38 then drives the fourth gear 39 to rotate, which in turn drives the worm gear 34 to rotate. Finally, the worm gear 34 drives the worm wheel 35 to rotate. Because the first contact 31 is fixed on the worm wheel 35, the rotation of the worm wheel 35 will cause the first contact 31 to move. This allows the first contact 31 to either abut against the first pressure plate 12 without contacting the first contact point, or the first contact 31 to move away from the first pressure plate 12 so that the first pressure plate 12 contacts the first contact point under the action of the elastic member 2. The combination of the first gear 36 (smaller than the second gear 37) and the second gear 37 achieves a first speed reduction. The second gear 37 (smaller than the third gear 38) and the third gear 38 (smaller than the fourth gear 39) achieve a second speed reduction. Finally, the combination of the worm gear 34 and the worm wheel 35 achieves a third speed reduction. These three speed reductions result in a slower rotation speed for the worm wheel 35, allowing it to drive the first contact 31 to operate slowly and smoothly. Both the worm wheel 35 and the valve plate 6 are mounted on the valve stem 7. The worm wheel 35 can drive the valve plate 6 to rotate via the valve stem 7. The valve plate 6 is located within the air duct, and its rotation opens and closes the air duct. When the worm wheel 35 operates slowly and smoothly, the valve plate 6 can slowly and smoothly open or close the air duct. It is understandable that "fully closed" of the valve device means that the valve plate 6 is rotated to be perpendicular to the axis of the air duct so that the air duct is completely closed, while "fully open" of the valve device means that the valve plate 6 is rotated to be parallel to the axis of the air duct so that the air duct is opened to its maximum.

[0032] See also Figure 1 and Figure 2 As shown, the valve device also includes a second switch 4, which comprises a second switch body 41 and a second pressure plate 42. The second switch body 41 has a second contact, and the second pressure plate 42 is connected to the elastic member 2. The power mechanism 3 also includes a second contact 32. When the elastic member 2 is in its initial state, the second pressure plate 42 contacts the second contact under the action of the elastic member 2, so that the second switch 4 is in the conducting state. The elastic member 2 also has a second deformation state. During the process of the power mechanism 3 driving the valve plate 6 to rotate, the second contact 32 can abut against the second pressure plate 42 and not contact the second contact, so that the second switch 4 is in the open state. The elastic member 2 is subjected to the force from the power mechanism 3 and is in the second deformation state. The elastic member 2 is mounted on the support 8, which is located above the worm gear 35.

[0033] In this technical solution, when the second switch 4 of the valve device is used to provide feedback on either the fully closed or fully open position indication of the valve device, if the fully closed or fully open position indication fails, that is, if the valve device continues to perform valve closing or opening actions, causing the power mechanism 3 to drive the second pressure plate 42 to stop contacting the second contact, the power mechanism 3 does not stop but continues to drive the second pressure plate 42 to move. Because the second pressure plate 42 is connected to the elastic component 2, the elastic component 2 can deform to provide a certain buffer space. Therefore, when the power mechanism 3 continues to drive the second pressure plate 42 to move, it is not a rigid resistance. Thus, it can also prevent the power mechanism 3 from being stuck for a long time, thereby avoiding the power mechanism 3 from overheating and burning out. Among them, the overheating and burning out of the power mechanism 3 mainly refers to the overheating and burning out of the motor 33. The second contact 32 is also fixed to the worm gear 35. Taking the first switch 1 as the fully closed position feedback and the second switch 4 as the fully open position feedback as an example, when the power mechanism 3 is running and its first contact 31 is not in contact with the first pressure plate 12 and its second contact 32 is not in contact with the second pressure plate 42, the elastic component 2 is in the initial state, and both the first switch 1 and the second switch 4 are in the conducting state. When the power mechanism 3 stops contacting the first contact point by pressing against the first pressure plate 12 with the first contact 31, the elastic component 2 is subjected to the force from the power mechanism 3 and is in the first deformation state. When the first switch 1 is in the open state and the second switch 4 is in the closed state, the controller 5 detects the change in the state of the first switch 1 and controls the motor 33 to stop rotating, and the valve plate 6 to the fully closed position. When the power mechanism 3 abuts against the second pressure plate 42 through the second contact 32 and is no longer in contact with the second contact point, the elastic component 2 is subjected to the force from the power mechanism 3 and is in the second deformation state, then the second switch 4 is in the open state and the first switch 1 is in the closed state. The controller 5 detects the change in the state of the second switch 4 and controls the motor 33 to stop rotating, and the valve plate 6 to the fully open position. It can be understood that the first switch 1 can also be used as feedback for the fully open position, in which case the first switch 1 is in the open state and the valve plate 6 is in the fully open position; and the second switch 4 can be used as feedback for the fully closed position, in which case the second switch 4 is in the open state and the valve plate 6 is in the fully closed position.

[0034] In one specific implementation, the elastic component 2 is a torsion spring, with the first pressure plate 12 and the second pressure plate 42 respectively connected to both sides of the torsion spring. When the elastic component 2 is a torsion spring, it can not only achieve the following: when the torsion spring is in its initial state, both the first switch 1 and the second switch 4 are in the on state; when the torsion spring is in its first deformation state, the first switch 1 is in the off state and the second switch 4 is in the on state; when the torsion spring is in its second deformation state, the second switch 4 is in the off state and the first switch 1 is in the on state; but also, the structure of the elastic component 2 is very simple.

[0035] It should be noted that existing technologies can avoid safety accidents caused by the failure to detect valve malfunctions during valve opening or closing, by adding angular displacement sensors or resistance detection to the actuator. However, angular displacement or resistance detection methods require complex circuitry to detect resistance changes and then calculate the position of the valve plate 6, resulting in a complex structure and high cost. In contrast, the mechanical structure combination design of two switches and elastic component 2 adopted in this application is not only simple and compact but also highly sensitive, significantly improving the system's reliability and adaptability.

[0036] This invention also provides a detection method for a valve device, using one of a first switch 1 and a second switch 4 as feedback for the fully open position of the valve plate 6, and the other as feedback for the fully closed position of the valve plate 6. The detection method includes: during the process of the power mechanism 3 driving the valve plate 6 to fully close or fully open, acquiring the real-time angle of the valve plate 6 and recording it as θ, and determining whether the fully closed or fully open end signal is abnormal based on the relationship between θ and a, b, and the fully closed or fully open end signal received by the controller 5; wherein a is a first angle setting value, b is a second angle setting value, and a < b. The formula for the controller 5 to calculate the angle θ of the valve plate 6 is: Among them, v i The rotational speed of valve plate 6 is output by controller 5, and the unit is ° / s; △t i The interval time is expressed in seconds (s).

[0037] In this embodiment, when valve plate 6 is accurately in the fully closed position, the angle θ of valve plate 6 is reset to 0°; when valve plate 6 is accurately in the fully open position, the angle θ of valve plate 6 is reset to 90°. The first angle setting value a is 5° to -10°, and the second angle setting value b is 85° to 100°. When controller 5 receives a fully closed or fully open end signal, it compares the current angle θ of valve plate 6 with a and b to determine whether valve plate 6 is accurately in the fully closed or fully open position, thereby determining whether the fully closed or fully open end signal is abnormal. An abnormal fully closed or fully open end signal refers to signal feedback being premature or delayed.

[0038] As a specific implementation method, taking the first switch 1 as the fully closed position feedback and the second switch 4 as the fully open position feedback as an example, when θ < a, it indicates that there is a large difference between the current angle of the valve plate 6 and the angle when the valve plate 6 is in the fully closed position. That is, after the power mechanism 3 drives the first pressure plate 12 to stop contacting the first contact, the power mechanism 3 is not controlled to stop running, resulting in the valve plate 6 rotating too much. If the controller 5 receives the fully closed end signal at this time, it determines that the fully closed end signal is abnormal, the unit stops running, and it is necessary to check whether the power mechanism 3 and the first switch 1 are abnormal. When θ ≥ b, it indicates that there is a large difference between the current angle of the valve plate 6 and the angle when the valve plate 6 is in the fully open position. That is, after the power mechanism 3 drives the second pressure plate 42 to stop contacting the second contact, the power mechanism 3 is not controlled to stop running, resulting in the valve plate 6 rotating too much. If the controller 5 receives the fully open end signal at this time, it determines that the fully open end signal is abnormal, the unit stops running, and it is necessary to check whether the power mechanism 3 and the second switch 4 are abnormal.

[0039] As a specific implementation method, when a≤θ<b, it indicates that the position of valve plate 6 is between fully closed and fully open. At this time, it is necessary to determine whether the fully closed end signal is abnormal based on the relationship between θ and c. Here, c is the third angle setting value, which is 5°~15°, and a<c<b.

[0040] More specifically, when θ > c, it indicates that there is a large difference between the current angle of valve plate 6 and the angle when valve plate 6 is in the fully closed position. If the controller 5 receives the fully closed end signal at this time, it is determined that the fully closed end signal is abnormal, the unit stops running, and it is necessary to check whether the power mechanism 3 and the first switch 1 are abnormal. When θ ≤ c, it indicates that the current angle of valve plate 6 is basically in line with the angle when valve plate 6 is in the fully closed position. If the controller 5 receives the fully closed end signal at this time, it is determined that the fully closed end signal is normal, and the unit runs normally.

[0041] It should be noted that the valve device performs a self-test control as follows upon initial power-on:

[0042] 1. Controller 5 controls motor 33 to make the valve device close at full speed. Within the designed full-speed valve closing time, controller 5 should receive a full-closing end signal feedback and stop rotating. If controller 5 does not detect the signal of the first switch 1 being open, it is determined that the full-closing end signal is abnormal, and the power mechanism 3, elastic component 2, and first switch 1 should be checked for abnormalities.

[0043] 2. When the full-close end signal is normal, proceed as follows: Controller 5 controls motor 33 to make the valve device open at full speed. Within the designed full-speed valve opening time, controller 5 should receive the full-open end signal feedback and stop rotating. If controller 5 does not detect the second switch 4 disconnect signal, it is determined that the full-open end signal is abnormal. The power mechanism 3, elastic component 2, and second switch 4 should be checked for abnormalities.

[0044] 3. When the fully open signal is normal, perform a reset and fully close operation: Controller 5 controls motor 33 to make the valve device close at full speed. Within the designed full-speed valve closing time, controller 5 should receive a full-close end signal feedback and stop rotating. If controller 5 does not detect the signal that the first switch 1 is open, it is determined that the full-close end signal is abnormal, and the power mechanism 3, elastic component 2, and first switch 1 should be checked for abnormalities.

[0045] IV. In the above operation, if both the first switch 1 and the second switch 4 are detected to be in the open state at the same time, it is determined that the fully closed and fully open end signals are abnormal (because the first switch 1 and the second switch 4 cannot be in the open state at the same time under the action of the torsion spring). The power mechanism 3, the elastic component 2, the first switch 1, and the second switch 4 should be checked for abnormalities.

[0046] Figure 5 This is a flowchart illustrating the detection process of the valve device according to an embodiment of the present invention. Figure 5 In the diagram, Y represents yes, N represents no, the valve angle calculation is the position calculation of valve plate 6, the fully closed signal is the fully closed end signal, the fully open signal is the fully open end signal, and if θ < a is not satisfied, it means θ > b.

[0047] The present invention also provides an air circulation refrigeration system, including the aforementioned valve device.

[0048] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0049] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A valve device, characterized in that, The device includes a first switch (1), an elastic component (2), a power mechanism (3), and a valve plate (6). The first switch (1) includes a first switch body (11) and a first pressure plate (12). The first switch body (11) has a first contact. The first pressure plate (12) is connected to the elastic component (2). The power mechanism (3) includes a first contact (31). The elastic component (2) has an initial state. When the elastic component (2) is in the initial state, the first pressure plate (12) contacts the first contact under the action of the elastic component (2) to make the first switch (1) in a conducting state. The elastic component (2) also has a first deformation state. The power mechanism (3) is configured to drive the valve plate (6) to rotate. During the process of the power mechanism (3) driving the valve plate (6) to rotate, the first contact (31) can abut against the first pressure plate (12) and not contact the first contact to make the first switch (1) in a disconnected state. The elastic component (2) is subjected to the force from the power mechanism (3) and is in the first deformation state.

2. The valve device according to claim 1, characterized in that, It also includes a second switch (4), which includes a second switch body (41) and a second pressure plate (42). The second switch body (41) has a second contact, and the second pressure plate (42) is connected to the elastic member (2). The power mechanism (3) also includes a second contact (32). When the elastic member (2) is in the initial state, the second pressure plate (42) contacts the second contact under the action of the elastic member (2) so that the second switch (4) is in the conducting state. The elastic member (2) also has a second deformation state. During the process of the power mechanism (3) driving the valve plate (6) to rotate, the second contact (32) can abut against the second pressure plate (42) and not contact the second contact so that the second switch (4) is in the disconnected state. The elastic member (2) is subjected to the force from the power mechanism (3) and is in the second deformation state.

3. The valve device according to claim 2, characterized in that, The elastic component (2) is a torsion spring, and the first pressure plate (12) and the second pressure plate (42) are respectively connected to both sides of the torsion spring.

4. The valve device according to claim 2, characterized in that, The power mechanism (3) also includes a motor (33), a worm (34) and a worm wheel (35). The worm (34) meshes with the worm wheel (35). The first contact (31) and the second contact (32) are both fixed on the worm wheel (35). The motor (33) can drive the worm (34) to rotate.

5. The valve device according to claim 4, characterized in that, The power mechanism (3) further includes a first gear (36), a second gear (37), a connecting shaft, a third gear (38), and a fourth gear (39). The first gear (36) is fixed on the output shaft of the motor (33). The second gear (37) and the third gear (38) are both fixed on the connecting shaft. The worm gear (34) is fixed on the fourth gear (39). The first gear (36) meshes with the second gear (37), and the third gear (38) meshes with the fourth gear (39). The diameter of the first gear (36) is smaller than the diameter of the second gear (37), the diameter of the second gear (37) is larger than the diameter of the third gear (38), and the diameter of the third gear (38) is smaller than the diameter of the fourth gear (39).

6. A method for detecting a valve device as described in any one of claims 2 to 5, characterized in that, The valve device further includes a controller (5); one of the first switch (1) and the second switch (4) is used as the feedback of the fully open position of the valve plate (6), and the other is used as the feedback of the fully closed position of the valve plate (6); the detection method includes: during the process of the power mechanism (3) driving the valve plate (6) to fully close or fully open, the real-time angle of the valve plate (6) is obtained and recorded as θ, and the full-close or full-open end signal received by the controller (5) is used to determine whether the full-close or full-open end signal is abnormal; wherein, a is the first angle setting value, b is the second angle setting value, and a < b.

7. The detection method according to claim 6, characterized in that, When θ < a, and the controller (5) receives a fully closed end signal, the fully closed end signal is determined to be abnormal; when θ ≥ b, and the controller (5) receives a fully open end signal, the fully open end signal is determined to be abnormal.

8. The detection method according to claim 6, characterized in that, When a≤θ<b, the full-off end signal is determined to be abnormal based on the relationship between θ and c; where c is the third angle setting value, and a<c<b.

9. The detection method according to claim 8, characterized in that, When θ > c, the all-off end signal is determined to be abnormal; when θ ≤ c, the all-off end signal is determined to be normal.

10. An air circulation refrigeration system, characterized in that, Includes the valve device as described in any one of claims 1 to 5.

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