Valve device with variable temperature sensing capability and thermomechanical training method thereof

Abstract

The present application belongs to the technical field of valve, and discloses a valve device with variable temperature sensing capability and a thermal mechanical training method thereof. The valve device comprises, from top to bottom, an upper fixed shell, an upper limiting disc, an upper fixed flange disc, a deformation sheet, a lower fixed flange disc, a lower limiting disc and a lower fixed shell, wherein the upper fixed shell is connected with the lower fixed shell; the deformation sheet is connected with the upper fixed flange disc and the lower fixed flange disc through studs, and a limiting cylinder is arranged in the middle part of the deformation sheet; the deformation sheet is made of nickel-titanium alloy with double-way shape memory; the upper limiting disc and the lower limiting disc are respectively formed with an upper limiting groove and a lower limiting groove; the opposite ends of the limiting cylinder respectively pass through the upper fixed flange disc and the lower limiting flange disc and extend into the upper limiting groove and the lower limiting groove; and the upper limiting disc and the lower limiting disc limit and control the deformation sheet through the limiting cylinder and the upper limiting groove and the lower limiting groove. The present application solves the problem that the temperature sensing control capability of a temperature sensing valve is very single.

Description

Technical Field

[0001] This invention belongs to the field of valve-related technology, and more specifically, relates to a valve device with variable temperature sensing capability and its thermomechanical training method. Background Technology

[0002] An automatic temperature control valve is a new type of valve used to control fluid temperature. It relies on the expansion force of the temperature-sensing material inside a temperature sensor to drive the valve to open and close, thereby regulating the flow rate of cold and hot fluids entering the valve and controlling the fluid outlet temperature. It is an automatic temperature control valve that does not require an external power source; instead, the thermal element absorbs heat from the fluid and converts it into mechanical energy, enabling the actuator to operate according to a specific regulatory pattern.

[0003] Nickel-titanium shape memory alloy is a special functional material that integrates sensing and actuation. It has a very unique shape memory effect and superelasticity. Based on the above characteristics of shape memory alloy materials, its application in automatic temperature control valves has extremely broad application prospects.

[0004] However, existing automatic temperature control valves based on nickel-titanium shape memory alloys have very limited temperature control capabilities. The same automatic temperature control valve often only has a single temperature control capability in different application environments. For example, in a certain application environment, the temperature control valve will gradually close when the fluid temperature rises. However, in application environments with other requirements, the temperature control valve will still only gradually close when the fluid temperature rises. This greatly limits the application of automatic temperature control valves. Summary of the Invention

[0005] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a valve device with variable temperature sensing capability and its thermomechanical training method, which is used to solve the defect that the temperature sensing valve has a very limited temperature control capability, thus providing a greater application prospect for temperature sensing valves.

[0006] To achieve the above objectives, according to one aspect of the present invention, a valve device with variable temperature sensing capability is provided. The valve device includes, from top to bottom, an upper fixed housing, an upper limit plate, an upper fixed flange, a deformable plate, a lower fixed flange, a lower limit plate, and a lower fixed housing, wherein the upper fixed housing and the lower fixed housing are connected.

[0007] The deformable plate is connected to the upper and lower fixed flanges via studs, and a limiting cylinder is provided in the middle. The deformable plate is made of nickel-titanium alloy with two-way shape memory. The upper and lower limiting plates are respectively formed with upper and lower limiting grooves. The two opposite ends of the limiting cylinder pass through the upper and lower fixed flanges and extend into the upper and lower limiting grooves. The upper and lower limiting plates limit the deformable plate through the limiting cylinder and the upper and lower limiting grooves. The deformable plate deforms according to the temperature of the fluid flowing into the valve device, thereby changing its blocking area on the flow channel of the valve device and thus adjusting the valve opening.

[0008] Furthermore, the valve device adjusts the limit deformation degree of the deformable piece for adaptive deformation by rotating the upper limit plate and the lower limit plate.

[0009] Furthermore, the upper fixed outer shell and the lower fixed outer shell have the same shape and structure, and are referred to as fixed outer shells; the fixed outer shell includes an annular body and multiple connecting ears, the multiple connecting ears are respectively connected to the outer periphery of the annular body, and the multiple connecting ears are evenly arranged around the central axis of the annular body; the annular body is also provided with a receiving groove.

[0010] Furthermore, the upper limit plate is a disc with a first groove, and an outer octagonal plate is provided on the bottom surface of the first groove. The outer octagonal plate and the first groove form the upper limit groove. The upper limit plate also has a first through hole that penetrates the upper limit plate.

[0011] Furthermore, the outer octagonal plate includes a circular plate and eight wedges, one side of each of the eight wedges is connected to the circumference of the circular plate, and one side of each wedge is tangent to the circular plate; the eight wedges are evenly arranged around the central axis of the circular plate.

[0012] Furthermore, the upper fixed flange includes a circular tube and a circular ring. One end of the circular tube is fixedly connected to the circular ring, and the circular tube and the circular ring form a third through hole. The circular ring is also provided with a fixing hole and an arc-shaped limiting hole. Two fixing holes and one limiting hole form a set of connecting holes. The two corresponding fixing holes are arranged at a radial distance along the circular ring. The limiting hole is arranged adjacent to the one of the two corresponding fixing holes that is closer to the geometric center of the circular ring.

[0013] Furthermore, the structure of the lower fixed flange is the same as that of the upper fixed flange; the deformable piece includes an arc-shaped strip and a willow blade, one end of the arc-shaped strip is connected to an annular piece, the annular piece forms a second mounting hole, and the other end of the arc-shaped strip is connected to the side of the willow blade; the limiting cylinder is disposed at the connection between the arc-shaped strip and the willow blade; a first mounting hole is provided at one end of the willow blade adjacent to the arc-shaped strip, one end of each of the two studs passes through the first mounting hole and the second mounting hole respectively and extends into the two corresponding fixing holes of the upper fixed flange, and the other end extends into the two corresponding fixing holes of the lower fixed flange respectively, so that the deformable piece is connected to the upper fixed flange and the lower fixed flange.

[0014] Furthermore, the lower limiting plate has an outer octagonal groove, and a circular plate is provided on the bottom surface of the outer octagonal groove. The circular plate and the outer octagonal groove form the lower limiting groove. The lower limiting plate also has a second through hole, which penetrates the bottom surface of the outer octagonal groove and the circular plate. The shape of the outer octagonal groove is the same as the shape of the outer octagonal deformable plate.

[0015] Furthermore, the upper limit groove is used to limit the maximum distance the deformable piece can move, and the lower limit groove is used to limit the minimum distance the deformable piece can move; the two receiving grooves are arranged opposite to each other and are used to receive the upper limit plate, the upper fixed flange, the deformable piece, the lower fixed flange, and the lower limit plate; the circular tube of the upper fixed flange passes through the first through hole of the upper limit plate, and the circular tube of the lower fixed flange passes through the second through hole of the lower limit plate; the two third through holes are coaxially arranged and connected to form the flow channel.

[0016] The present invention also provides a thermomechanical training method for a valve device with variable temperature sensing capability as described above, the method comprising the following steps:

[0017] (1) Rotate the upper limit plate and the lower limit plate so that the upper limit plate and the lower limit plate do not restrict the adaptive movement of the deformable piece;

[0018] (2) A fluid with a temperature lower than the martensitic phase transformation end temperature of the deformed sheet is introduced into the valve device. After the deformed sheet completes its adaptive movement and reaches the minimum / maximum distance, the upper limit plate and the lower limit plate are rotated so that the deformed sheet moves in the opposite direction to the adaptive movement to reach the maximum / minimum distance.

[0019] (3) A fluid with a temperature higher than the end temperature of the austenitic phase transformation of the deformed sheet is introduced into the valve device;

[0020] (4) Repeat steps (1) to (3) more than or equal to 30 times to obtain reverse two-way memory for the deformed piece.

[0021] In summary, compared with the prior art, the valve device with variable temperature sensing capability and its thermomechanical training method provided by the present invention mainly have the following advantages:

[0022] Beneficial effects:

[0023] 1. The valve device provided by the present invention can be set to a constant value, and the cross-sectional area through which the fluid passes in the flow channel is constant.

[0024] 2. The deformable plate is made of nickel-titanium shape memory alloy. Due to the temperature sensitivity of nickel-titanium shape memory alloy, it can adaptively deform according to the temperature of the inflowing fluid, thereby changing the cross-sectional area through which the fluid passes in the flow channel, and realizing adaptive control according to the temperature of the fluid passing through the valve.

[0025] 3. The valve device can be modified to adapt its size and direction of control according to the needs of use. For example, it can gradually open the valve as the flow rate increases with the temperature, or it can gradually close the valve as the flow rate increases with the temperature.

[0026] 4. The valve device avoids the multi-step and cumbersome working process of temperature detection unit, control unit and mechanical unit in traditional temperature sensing regulating valve. It has the advantages of adaptive regulation function and simple structure. It can realize flexible regulation of flow rate with temperature, with high regulation accuracy, and can make rapid response to fluid temperature fluctuations. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the valve device with variable temperature sensing capability provided by the present invention;

[0028] Figure 2 yes Figure 1 An exploded schematic diagram of a valve device with variable temperature sensing capability;

[0029] Figure 3 yes Figure 1 A schematic diagram of the structure of a deformable plate in a valve device with variable temperature sensing capability;

[0030] Figure 4 yes Figure 3 A schematic diagram of the deformable sheet at another angle;

[0031] Figure 5 yes Figure 1 A schematic diagram of the upper fixed flange of a valve device with variable temperature sensing capability;

[0032] Figure 6 yes Figure 5 A schematic diagram of the upper fixed flange from another angle;

[0033] Figure 7 yes Figure 1 A schematic diagram of the lower fixed flange of a valve device with variable temperature sensing capability;

[0034] Figure 8 yes Figure 7 A schematic diagram of the lower fixed flange;

[0035] Figure 9 yes Figure 1 A schematic diagram of the upper limit plate of a valve device with variable temperature sensing capability;

[0036] Figure 10 yes Figure 9 A schematic diagram of the upper limit dial at another angle;

[0037] Figure 11 yes Figure 1 A schematic diagram of the lower limit plate of a valve device with variable temperature sensing capability;

[0038] Figure 12 yes Figure 11 A schematic diagram of the lower limit plate at another angle;

[0039] Figure 13 yes Figure 1 A schematic diagram of the fixed housing of a valve device with variable temperature sensing capability;

[0040] Figure 14 yes Figure 13 A schematic diagram of the fixed outer casing at another angle;

[0041] Figure 15 yes Figure 1 A schematic diagram illustrating the adaptive principle of a valve device with variable temperature sensing capability, where the deformable plate changes with the temperature of the fluid passing through it.

[0042] Figure 16 This is a phase transition temperature curve of the deformed sheet in Example 1, measured by differential scanning calorimetry (DSC).

[0043] Figure 17 This is a phase transition temperature curve of the deformed sheet in Example 2, measured by differential scanning calorimetry (DSC).

[0044] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-upper fixed housing, 2-upper limit plate, 3-upper fixed flange, 4-stud, 5-bolt, 6-lower fixed housing, 7-deformable plate, 8-lower fixed flange, 9-lower limit plate. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0046] This invention provides a valve device with variable temperature sensing capability. The valve device can either set a constant valve temperature or adaptively regulate the flow rate according to temperature, with the degree of adaptive regulation being modifiable. The adaptive regulation capability can also be modified according to usage requirements; for example, it can gradually open the valve as the temperature of the fluid passing through it increases, or it can gradually close the valve as the temperature of the fluid passing through it increases.

[0047] Please see Figure 1 and Figure 2 The valve device includes, from top to bottom, an upper fixed housing 1, an upper limit plate 2, an upper fixed flange 3, a deformable piece 7, a lower fixed flange 8, a lower limit plate 9, and a lower fixed housing 6. The upper fixed housing 1 and the lower fixed housing 6 are connected together by bolts 5. The deformable piece 7 is connected to the upper fixed flange 3 and the lower fixed flange 8 by studs 4, and forms a movable connection with the upper limit plate 2 and the lower limit plate 9 respectively by limiting cylinders.

[0048] Please see Figure 13 and Figure 14 The upper fixed outer shell 1 and the lower fixed outer shell 6 have the same shape and structure, and for ease of description, they are referred to as fixed shells. The fixed shell includes an annular body and multiple connecting ears, which are respectively connected to the outer periphery of the annular body and are evenly arranged around the central axis of the annular body. The annular body also has a receiving groove, the central axis of which coincides with the central axis of the annular body. In this embodiment, the number of connecting ears is four.

[0049] Please see Figure 9 and Figure 10 The upper limit plate 2 is a disc with a first groove. An octagonal plate is provided on the bottom surface of the first groove, forming an upper limit groove with the first groove. The upper limit plate 2 also has a first through hole that penetrates the upper limit plate 2. The central axis of the first through hole, the central axis of the first groove, and the central axis of the octagonal plate coincide. A protrusion is provided on the end face of the upper limit plate away from the first groove, and the first through hole penetrates the protrusion.

[0050] In this embodiment, the outer octagonal plate includes a circular plate and eight wedges. One side of each of the eight wedges is connected to the circumference of the circular plate, and one side of each wedge is tangent to the circular plate. The eight wedges are evenly arranged around the central axis of the circular plate.

[0051] Please see Figure 5 and Figure 6 The upper fixed flange 3 includes a circular tube and a circular ring. One end of the circular tube is fixedly connected to the circular ring. The circular tube and the circular ring form a third through hole, and the central axis of the third through hole, the central axis of the circular tube, and the central axis of the circular ring coincide. The circular ring also has fixing holes and an arc-shaped limiting hole. Two fixing holes and one limiting hole form a set of connecting holes. Corresponding fixing holes are arranged radially spaced along the circular ring, and the limiting hole is positioned closest to the geometric center of the circular ring among the two adjacent fixing holes. In this embodiment, the number of sets of connecting holes is 8, and the eight sets of connecting holes are evenly arranged around the central axis of the circular ring.

[0052] Please see Figure 7 and Figure 8 The structure of the lower fixed flange 8 is the same as that of the upper fixed flange 3.

[0053] Please see Figure 3 and Figure 4 The deformable piece 7 is made of a nickel-titanium alloy with two-way shape memory. It includes an arc-shaped strip and a willow leaf. One end of the arc-shaped strip is connected to an annular piece, which forms a second mounting hole. The other end of the arc-shaped strip is connected to the side of the willow leaf. A limiting cylinder is provided at the connection between the arc-shaped strip and the willow leaf. The two ends of the limiting cylinder pass through the limiting holes of the upper fixed flange 3 and the lower fixed flange 8, respectively, and extend into the upper limit groove of the upper limit plate 2 and the lower limit groove of the lower limit plate 9, so that the limiting cylinder is movably connected to the upper limit groove and the lower limit groove, respectively. The upper limit plate 2 and the lower limit plate 9 limit the deformable piece 7 through the limiting cylinder and the upper limit groove and the lower limit groove.

[0054] The large end of the willow blade is provided with a first mounting hole. One end of each of the two studs 4 passes through the first mounting hole and the second mounting hole respectively and extends into the two fixing holes corresponding to the upper fixing flange 3. The other end extends into the two fixing holes corresponding to the lower fixing flange 8 respectively, so that the deformable piece 7 is connected to the upper fixing flange 3 and the lower fixing flange 8.

[0055] Please see Figure 11 and Figure 12The lower limiting plate 9 has an octagonal groove, and a circular plate is provided on the bottom surface of the octagonal groove. The circular plate and the octagonal groove together form the lower limiting groove. The lower limiting plate 9 also has a second through hole, which penetrates the bottom surface of the octagonal groove and the circular plate. In this embodiment, the shape of the octagonal groove is the same as the shape of the octagonal deformable plate.

[0056] The upper limit groove is used to limit the maximum distance the deformable piece 7 can move, and the lower limit groove is used to limit the minimum distance the deformable piece 7 can move. The two receiving grooves are arranged opposite each other and together house the upper limit plate 2, the upper fixed flange 3, the deformable piece 7, the lower fixed flange 8, and the lower limit plate 9. The circular tube of the upper fixed flange 3 passes through the first through hole of the upper limit plate 2, and the circular tube of the lower fixed flange 8 passes through the second through hole of the lower limit plate 9. The upper limit plate 2 and the lower limit plate 9 are respectively disposed in the two receiving grooves. The upper fixed outer shell 1 and the lower fixed outer shell 6 are connected together by connecting lugs and bolts 5. The two third through holes are coaxially arranged and connected to form a flow channel for fluid passage. The deformable piece 7 is located between the upper fixed flange 3 and the lower fixed flange 8. The deformable plate 7 deforms according to the temperature of the fluid, thereby changing its blocking area on the flow channel and thus adjusting the valve opening. The degree of adaptive deformation of the deformable plate 7 can be adjusted by rotating the upper limit plate 2 and the lower limit plate 9. Figure 15 , Figure 16 and Figure 17 .

[0057] This invention also provides a thermomechanical training method for a valve device with variable temperature sensing capability, the method mainly comprising the following steps:

[0058] Step 1: Rotate the upper limit plate 2 and the lower limit plate 9 so that the upper limit plate 2 and the lower limit plate 9 do not restrict the adaptive movement of the deformable piece 7.

[0059] Step 2: Pass fluid with a temperature lower than the martensitic phase transformation end temperature of the deformable plate 7 into the valve device. After the deformable plate 7 completes its adaptive movement and reaches the minimum / maximum distance, rotate the upper limit plate 2 and the lower limit plate 9 so that the deformable plate 7 moves in the opposite direction to the adaptive movement to reach the maximum / minimum distance.

[0060] Step 3: Introduce a fluid at a temperature higher than the end temperature of the austenitic phase transformation of the deformed sheet 7 into the valve device.

[0061] Step 4: Repeat steps 1 to 3 at least 30 times to obtain reverse two-way memory for the deformable piece 7.

[0062] The present invention will be further described in detail below with reference to several embodiments.

[0063] Example 1

[0064] Embodiment 1 of the present invention provides a valve device with variable temperature sensing capability. The valve device consists of an upper fixed housing 1, an upper limit plate 2, an upper fixed flange 3, a deformable piece 7, a stud 4, a lower fixed flange 8, a lower limit plate 9, a lower fixed housing 6, and bolts 5.

[0065] The deformable piece 7 is made of a nickel-titanium alloy with an atomic ratio of Ni. 50.05 Ti, measured by differential scanning calorimetry (DSC), showed that the martensitic transformation end temperature of deformed piece 7 was 10.2℃ and the austenitic transformation end temperature was 91.8℃ (DSC measurement results are shown in the figure). Figure 16 );

[0066] When water at temperatures ranging from 15°C to 90°C is introduced into the valve device, it can be observed that the valve device gradually opens as the water temperature rises and gradually closes as the water temperature decreases.

[0067] Thermomechanical training of the valve device specifically includes the following steps:

[0068] S1: Rotate the upper limit plate 2 and the lower limit plate 9 so that the upper limit plate 2 and the lower limit plate 9 do not restrict the adaptive movement of the deformable piece 7.

[0069] S2: Water at 0°C is introduced into the valve device. After the deformable piece 7 completes its adaptive movement, the valve device gradually closes. The upper limit plate 2 and the lower limit plate 9 are rotated so that the deformable piece 7 moves in the opposite direction to the adaptive movement and opens the valve device.

[0070] S3: Introduce 98°C water into the valve device.

[0071] S4: Repeat steps S1-S3 40 times, and the deformed piece 7 obtains reverse two-way memory.

[0072] When water at temperatures ranging from 15°C to 90°C is introduced into the valve device, it can be observed that the valve device gradually closes as the water temperature rises and gradually opens as the water temperature decreases.

[0073] Example 2

[0074] Embodiment 2 of the present invention provides a valve device with variable temperature sensing capability. The valve device consists of an upper fixed housing 1, an upper limit plate 2, an upper fixed flange 3, a deformable piece 7, a stud 4, a lower fixed flange 8, a lower limit plate 9, a lower fixed housing 6, and bolts 5.

[0075] The deformable piece 7 is made of a nickel-titanium alloy with an atomic ratio of Ni. 50.43 Ti, measured by differential scanning calorimetry (DSC), showed that the martensitic transformation end temperature of deformed piece 7 was -35℃ and the austenitic transformation end temperature was 10.8℃ (DSC measurement results are shown in the figure). Figure 17 ).

[0076] When alcohol at temperatures ranging from -30°C to 10°C is introduced into the valve device, it can be observed that the valve device gradually opens as the alcohol temperature rises and gradually closes as the alcohol temperature decreases.

[0077] Thermomechanical training of the valve device specifically includes the following steps:

[0078] S1: Rotate the upper limit plate 2 and the lower limit plate 9 so that the upper limit plate 2 and the lower limit plate 9 do not restrict the adaptive movement of the deformable piece 7.

[0079] S2: Introduce -40°C alcohol into the valve device. After the deformable piece 7 completes its adaptive movement, the valve device gradually closes. Rotate the upper limit plate 2 and the lower limit plate 9 to move the deformable piece 7 in the opposite direction to the adaptive movement before the valve device opens.

[0080] S3: Introduce 15°C alcohol into the valve device.

[0081] S4: Repeat steps S1-S3 50 times, and the deformed piece 7 obtains reverse two-way memory.

[0082] When alcohol at temperatures ranging from -30°C to 10°C is introduced into the valve device, it can be observed that the valve device gradually closes as the alcohol temperature rises and gradually opens as the alcohol temperature decreases.

[0083] This invention also provides a method for fabricating a valve device with variable temperature sensing capability, which uses 3D or 4D printing technology to integrally fabricate the valve device with variable temperature sensing capability. The specific steps are as follows:

[0084] S1: Model the valve device using 3D modeling software such as Magics, UG, and PROE, and save it as an STL format file.

[0085] S2: Input the saved STL format file into the selective laser melting and forming equipment, select a metal substrate, and after the substrate is ground flat, perform sandblasting treatment so that the alloy powder can be evenly spread on it.

[0086] S3: Close the molding chamber door, turn on the gas circulation system, inject argon protective gas to make the oxygen content in the molding chamber lower than 200ppm, and preheat the substrate to 100-200℃.

[0087] S4: When the oxygen content and preheating temperature in the forming chamber reach the set values, the laser forming adaptive variable cross-sectional area valve device is started. The laser power is 100W to 500W, the scanning speed is 300mm / s to 1500mm / s, the powder layer thickness is 30 to 50μm, and the scanning interval is 120μm.

[0088] S5: After the valve device is formed, it is cut off from the substrate by wire cutting and then sandblasted to remove surface defects.

[0089] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is 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 scope of protection of the present invention.

Claims

1. A valve device with variable temperature sensing capability, characterized in that: The valve device includes, from top to bottom, an upper fixed housing, an upper limit plate, an upper fixed flange, a deformable plate, a lower fixed flange, a lower limit plate, and a lower fixed housing, wherein the upper fixed housing and the lower fixed housing are connected. The deformable plate is connected to the upper and lower fixed flanges via studs, and a limiting cylinder is provided in the middle. The deformable plate is made of nickel-titanium alloy with two-way shape memory. The upper and lower limiting plates are respectively formed with upper and lower limiting grooves. The two opposite ends of the limiting cylinder pass through the upper and lower fixed flanges and extend into the upper and lower limiting grooves. The upper and lower limiting plates limit the deformable plate through the limiting cylinder and the upper and lower limiting grooves. The deformable plate deforms according to the temperature of the fluid flowing into the valve device, thereby changing its blocking area on the flow channel of the valve device and thus adjusting the valve opening. The upper limit plate is a circular disk with a first groove. An outer octagonal plate is provided on the bottom surface of the first groove, and the outer octagonal plate and the first groove form the upper limit groove. The upper limit plate also has a first through hole that penetrates the upper limit plate. The outer octagonal plate includes a circular plate and eight wedges. One side of each of the eight wedges is connected to the circumference of the circular plate, and one side of each wedge is tangent to the circular plate. The eight wedges are evenly arranged around the central axis of the circular plate.

2. The valve device with variable temperature sensing capability as described in claim 1, characterized in that: The valve device adjusts the limit deformation degree of the deformable piece for adaptive deformation by rotating the upper limit plate and the lower limit plate.

3. The valve device with variable temperature sensing capability as described in claim 1, characterized in that: The upper fixed shell and the lower fixed shell have the same shape and structure, and are referred to as fixed shells; the fixed shell includes an annular body and multiple connecting ears, which are respectively connected to the outer periphery of the annular body, and the multiple connecting ears are evenly arranged around the central axis of the annular body; the annular body is also provided with a receiving groove.

4. The valve device with variable temperature sensing capability as described in claim 3, characterized in that: The upper fixed flange includes a circular tube and a circular ring. One end of the circular tube is fixedly connected to the circular ring, and the circular tube and the circular ring form a third through hole. The circular ring is also provided with a fixing hole and an arc-shaped limiting hole. Two fixing holes and one limiting hole form a set of connecting holes. The two corresponding fixing holes are arranged at a radial distance along the circular ring. The limiting hole is arranged adjacent to the one of the two corresponding fixing holes that is closer to the geometric center of the circular ring.

5. The valve device with variable temperature sensing capability as described in claim 4, characterized in that: The structure of the lower fixed flange is the same as that of the upper fixed flange; the deformable piece includes an arc-shaped strip and a willow blade, one end of the arc-shaped strip is connected to an annular piece, the annular piece forms a second mounting hole, and the other end of the arc-shaped strip is connected to the side of the willow blade; the limiting cylinder is disposed at the connection between the arc-shaped strip and the willow blade; a first mounting hole is provided at one end of the willow blade adjacent to the arc-shaped strip, one end of each of the two studs passes through the first mounting hole and the second mounting hole respectively and extends into the two corresponding fixing holes of the upper fixed flange, and the other end extends into the two corresponding fixing holes of the lower fixed flange respectively, so that the deformable piece is connected to the upper fixed flange and the lower fixed flange.

6. The valve device with variable temperature sensing capability as described in claim 5, characterized in that: The lower limiting plate has an outer octagonal groove, and a circular plate is provided on the bottom surface of the outer octagonal groove. The circular plate and the outer octagonal groove form the lower limiting groove. The lower limiting plate also has a second through hole, which penetrates the bottom surface of the outer octagonal groove and the circular plate. The shape of the outer octagonal groove is the same as the shape of the outer octagonal plate.

7. The valve device with variable temperature sensing capability as described in claim 6, characterized in that: The upper limit groove is used to limit the maximum distance the deformable piece can move, and the lower limit groove is used to limit the minimum distance the deformable piece can move. The two receiving grooves are arranged opposite to each other and are used to receive the upper limit plate, the upper fixed flange, the deformable piece, the lower fixed flange, and the lower limit plate. The circular tube of the upper fixed flange passes through the first through hole of the upper limit plate, and the circular tube of the lower fixed flange passes through the second through hole of the lower limit plate. The two third through holes are coaxially arranged and connected to form the flow channel.

8. A thermomechanical training method for a valve device with variable temperature sensing capability as described in any one of claims 1-7, characterized in that, The method includes the following steps: (1) Rotate the upper limit plate and the lower limit plate so that the upper limit plate and the lower limit plate do not restrict the adaptive movement of the deformable piece; (2) A fluid with a temperature lower than the martensitic phase transformation end temperature of the deformed sheet is introduced into the valve device. After the deformed sheet completes its adaptive movement and reaches the minimum / maximum distance, the upper limit plate and the lower limit plate are rotated so that the deformed sheet moves in the opposite direction to the adaptive movement to reach the maximum / minimum distance. (3) A fluid with a temperature higher than the end temperature of the austenitic phase transformation of the deformed sheet is introduced into the valve device; (4) Repeat steps (1) to (3) more than or equal to 30 times to obtain reverse two-way memory for the deformed piece.

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