Temperature sensing driver
By combining shape memory alloy springs and reset springs, the problems of slow response, easy clogging, and poor compatibility of wax-coated temperature-sensing actuators are solved, enabling rapid response and stable equipment upgrades, reducing replacement costs, and improving equipment reliability and lifespan.
Patent Information
- Application Number
- CN202520618995.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-04-03
AI Technical Summary
Traditional wax-coated temperature sensors suffer from slow response, clogging, delamination, and poor compatibility, resulting in high replacement costs and poor equipment stability.
It adopts a combination design of shape memory alloy spring and return spring, which senses temperature changes and drives the push rod to move. The structure is compact and the force transmission path is optimized. It can directly replace the wax pack without modifying the original structure.
It improves response speed and equipment compatibility, reduces replacement costs, ensures equipment stability and control precision, and extends service life.
Smart Images
Figure CN223739577U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to temperature sensing element technical field, especially relate to a temperature sensing driver. BACKGROUND
[0002] Temperature sensing driver is a kind of device that can automatically produce mechanical movement according to the change of ambient temperature or medium temperature, is widely used in temperature control equipment, automobile system, industrial equipment and household appliance etc.
[0003] Wax package, also known as paraffin temperature package, is the most widely used mechanical temperature sensing driving element in the world. Its structure is to inject mixed liquid of paraffin and copper powder into a copper pipe, then add a layer of sealing film at the pipe opening, and install a top rod. When the mixed liquid in the copper pipe absorbs heat from the outside and expands, it pushes the top rod out, realizing the function of temperature sensing driving.
[0004] However, as a traditional temperature sensing element, wax package has some natural drawbacks. On the one hand, wax package needs to heat the mixed liquid in the entire copper pipe to produce sufficient expansion, which requires absorbing a large amount of heat, resulting in that it cannot respond quickly to small fluctuations in temperature, and the driving action has obvious hysteresis. On the other hand, the top rod and the copper shell need to maintain a precise fit gap, but in actual use, the scale and small particles in the temperature sensing medium and other foreign matters are easy to block these gaps, causing the wax package to be stuck and fail. In addition, under repeated cold and hot changes, the mixed liquid of paraffin and copper powder will stratify due to the difference in specific gravity, which greatly affects the service life of the wax package. Although wax package has the above problems, due to its long-term and widespread application, the existing many driver structures are designed around wax package, which makes it face compatibility obstacles when directly replaced by new temperature sensing elements, increasing the replacement cost and technical difficulty. SUMMARY
[0005] To solve the above technical problems, the utility model provides a temperature sensing driver which can directly replace wax package.
[0006] The technical scheme of the utility model is:
[0007] The utility model provides a temperature sensing driver, which comprises:
[0008] A shell having a receiving cavity, the shell being provided with a connecting portion for connecting a to-be-driven member and a liquid passing hole communicating with the receiving cavity;
[0009] A top rod movably connected with the shell, comprising an abutting end and a limiting end arranged oppositely, wherein the abutting end is arranged in the receiving cavity;
[0010] A memory alloy spring is arranged in the accommodating cavity, and one end of the memory alloy spring is in abutment with the shell, and the other end is in abutment with the abutment end of the top rod; the memory alloy spring is configured to sense the temperature of the liquid entering the accommodating cavity through the liquid passing hole, and can drive the driven member to move away from the limiting end.
[0011] A reset spring is arranged outside the shell and is configured to drive the driven member to move towards the limiting end.
[0012] Further, the two sides of the shell are provided with a first limiting member and a second limiting member, wherein the first limiting member is in abutment with the limiting end of the top rod, and the second limiting member is in abutment with one end of the reset spring away from the driven member.
[0013] Further, one end of the reset spring is in abutment with the second limiting member, and the other end is in abutment with the driven member.
[0014] Further, the driven member is provided with a matching part for connecting with the connecting part and a first extension wall extending outward from the matching part, and the first extension wall is in abutment with the other end of the reset spring.
[0015] Further, the first extension wall is further provided with a limiting wall connected with the first extension wall and surrounding the outer periphery of the matching part, and the matching part, the first extension wall and the limiting wall together surround the abutment groove for accommodating the reset spring.
[0016] Further, one end of the reset spring is in abutment with the second limiting member, and the other end is in abutment with the shell.
[0017] Further, the shell comprises a first end for connecting the driven member and a second end arranged opposite to the first end, and the first end is provided with a second extension wall extending outward from the connecting part, and the second extension wall is used for abutting with the other end of the reset spring.
[0018] Further, the second end is provided with a groove and a snap spring, one end of the memory alloy spring is in abutment with the snap spring, and the other end is in abutment with the abutment end of the top rod.
[0019] Further, in parallel to the moving direction of the driven member, the length of the reset spring is greater than the length of the memory alloy spring.
[0020] Further, the shell and the driven member are both provided with a channel for the top rod to pass through.
[0021] The beneficial technical effects of the utility model are:
[0022] The temperature sensing driver of the utility model can directly replace the wax package, has high universality and installation convenience, when upgrading or maintaining the equipment, the original driving structure does not need to be complicatedly changed, only needs to directly take down the wax package, replaces the temperature sensing driver of the utility model, can, greatly reduces the replacement cost and time cost, improves the equipment maintenance and upgrading efficiency. In addition, the moving direction of the temperature sensing driver of the utility model is consistent with the original wax package driving when the temperature rises and reduces, so that when the equipment is replaced, the mechanical parts and control system connected therewith do not need to be re-commissioned or modified, ensuring the compatibility and stability of the equipment, reducing the system adaptation problem possibly caused by the replacement of the driving element, ensuring the normal operation and control precision of the equipment.
[0023] By locating the reset spring and the memory alloy spring on the same side and sleeving the reset spring outside the memory alloy spring, the structure of the whole temperature sensing driver is more compact, and the installation space is saved. At the same time, this design helps to optimize the force transmission path of the temperature sensing driver, improve the response speed and action accuracy of the temperature sensing driver, and ensure that the memory alloy spring can quickly and accurately stretch and contract when the temperature changes, so as to drive the to-be-driven member to produce stable mechanical movement, realizing accurate control of the equipment. In addition, this layout helps to balance the force distribution inside the temperature sensing driver, reduces internal friction and wear caused by unbalanced force, and further improves the reliability and service life of the temperature sensing driver. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 is a structure schematic view of the temperature sensing driver according to the preferred embodiment of the utility model;
[0025] Figure 2 is Figure 1 is a sectional view of the temperature sensing driver in a low-temperature state;
[0026] Figure 3 is Figure 1 is a sectional view of the temperature sensing driver in a high-temperature state.
[0027] BRIEF DESCRIPTION OF DRAWINGS
[0028] Temperature sensing driver 100, shell 10, containing cavity 11, connecting part 12, clasp spring 13, liquid passing hole 14, memory alloy spring 20, top rod 30, abutting end 31, limiting end 32, reset spring 40, to-be-driven member 50, first extension wall 51, limiting wall 52, first limiting piece 61, second limiting piece 62. DETAILED DESCRIPTION
[0029] In order to enable the technical means of the utility model to be understood more clearly, and to be implemented in accordance with the contents of the specification, the specific implementation mode of the utility model is described in further detail below in combination with the drawings and examples, and the following examples are used to illustrate the utility model, but are not used to limit the scope of the utility model.
[0030] Please refer to Figures 1 to 3 The utility model provides a temperature sensor 100, including casing 10, top rod 30, memory alloy spring 20 and reset spring 40.
[0031] Casing 10 is cylindrical, including the first end for connecting the driven part 50 and the second end opposite to the first end. The first end and the second end are provided with a receiving cavity 11. The receiving cavity 11 can not only provide installation space for the memory alloy spring 20, but also can provide the activity space for the abutting end 31 of the top rod 30 to slide in the receiving cavity 11, to realize the movable connection of the top rod 30 and the casing 10. By setting the casing 10, the expansion and contraction movement of the memory alloy spring 20 in the receiving cavity 11 can be converted into the mechanical displacement of the casing 10, which is transmitted to the driven part, so as to realize the driving control of the temperature change sensing.
[0032] In addition, the casing 10 can provide physical protection for the memory alloy spring 20 in the receiving cavity 11, prevent it from being mechanically damaged by the outside in the use process, and can also isolate the memory alloy spring 20 from the direct contact with the foreign matter in the temperature sensing medium to a certain extent, avoiding the problem that the gap between the top rod 30 and the copper casing 10 in the wax package is blocked, prolonging the service life of the temperature sensor 100 and improving its reliability in harsh environment.
[0033] The first end of the casing 10 is provided with a connecting part 12 for connecting the driven part 50, to ensure the stable connection between the casing 10 and the driven part 50. Optionally, in the embodiment, the connecting part 12 is an external thread arranged outside the protruding part of the first end, which is connected by thread to realize the reliable connection of the casing 10 and the driven part 50. In other embodiments, the connecting part 12 can also be other structures, such as buckle, or interference fit, etc. The utility model does not limit this. The setting of the connecting part 12 not only makes the temperature sensor 100 can be connected with the driven part 50 conveniently and quickly, but also ensures that the movement direction of the driven part 50 is consistent with the casing 10, so as to realize the accurate control and stable operation of the equipment.
[0034] The second end of the shell 10 is provided with a recess and a snap spring 13. The snap spring 13 is clamped in the recess, thereby fixing the snap spring on the shell 10. One end of the memory alloy spring 20 abuts against the snap spring 13, and the other end abuts against the abutting end 31 of the ejector rod 30. The recess and the snap spring 13 provide a stable fixed end for the memory alloy spring 20, ensuring correct installation and reliable operation of the memory alloy spring 20 in the shell 10.
[0035] The shell 10 is further provided with liquid passing holes 14 communicating with the accommodating cavity 11. In the embodiment, a plurality of liquid passing holes 14 are arranged on the peripheral wall of the shell 10. The arrangement of the liquid passing holes 14 enables the temperature sensing medium to smoothly enter the accommodating cavity 11 and contact the memory alloy spring 20 in the accommodating cavity 11, so that the memory alloy spring 20 can accurately sense temperature changes, thereby achieving precise temperature sensing driving.
[0036] The memory alloy spring 20 is made of an alloy material having a shape memory effect. The crystal grains of the memory alloy spring 20 are austenite in a high-temperature state, and the shear modulus and elastic modulus are high. In a low-temperature state, the crystal grains are martensite, and the shear modulus and elastic modulus are low. The elastic force of the memory alloy spring 20 at high temperature is several times larger than that at low temperature. Therefore, the memory alloy spring 20 can sense the temperature of the outside world and respond accordingly.
[0037] In the utility model, the memory alloy spring 20 is arranged in the accommodating cavity 11 of the shell 10. One end of the memory alloy spring 20 abuts against the shell 10, and the other end abuts against the abutting end 31 of the ejector rod 30. The memory alloy spring 20 is configured to sense the temperature of the liquid entering the accommodating cavity 11 through the liquid passing hole 14. When the temperature of the liquid rises, the elastic force of the memory alloy spring 20 increases, thereby driving the shell 10 to move the to-be-driven member 50 away from the limiting end 32. In this way, the movement direction of the temperature sensing driver 100 and the to-be-driven member 50 is consistent with the movement direction before the wax packet (as shown in Figure 2 and Figure 3 The temperature sensing driver 100 of the utility model can quickly and accurately respond to temperature changes after replacing the wax driver, thereby achieving precise temperature control.
[0038] The force value sensitivity of the memory alloy spring 20 to water temperature can reach 0.1 DEG C, that is, the memory alloy spring 20 can respond to a temperature difference change of 0.1 DEG C. Moreover, the response speed of the memory alloy spring 20 to sharp changes in water temperature is as high as 0.2 seconds. Therefore, after the temperature sensing driver 100 of the utility model replaces the wax driver, the temperature sensing driver 100 can quickly and accurately respond to temperature changes, thereby achieving precise temperature control.
[0039] The top rod 30 is movably connected with the shell 10, and includes oppositely arranged abutting end 31 and limiting end 32. Wherein, the abutting end 31 is located in the accommodating cavity 11 of the shell 10, and abuts with one end of the memory alloy spring 20. The limiting end 32 is located on the outside of the shell 10, and abuts with the first limiting piece 61. By setting the first limiting piece 61, the position of the top rod 30 is fixed. When the memory alloy spring 20 senses temperature rise and the elastic force increases, since the limiting end 32 of the top rod 30 is limited by the first limiting piece 61, the top rod 30 cannot move, so that the memory alloy spring 20 can drive the shell 10 to move away from the limiting end 32.
[0040] The reset spring 40 is arranged on the outside of the shell 10, and is configured to drive the to-be-driven piece 50 to move towards the limiting end 32. The main function of the reset spring 40 is to provide driving force for the to-be-driven piece 50 to move towards the limiting end 32 when the temperature decreases, and cooperate with the temperature response action of the memory alloy spring 20 to realize the reciprocating motion of the temperature sensing driver 100, and ensure the cyclic working ability of the driver.
[0041] In addition, in the utility model, the reset spring 40 and the memory alloy spring 20 are arranged on the same side, so that the structure of the whole temperature sensing driver 100 is more compact, and the installation space is saved. At the same time, it is helpful to balance the force distribution inside the temperature sensing driver 100, reduce the internal friction and wear caused by the unbalance of force, and further improve the reliability and service life of the temperature sensing driver 100.
[0042] Further, in parallel to the moving direction of the to-be-driven piece 50, the length of the reset spring 40 is greater than the length of the memory alloy spring 20. By such arrangement, the reset spring 40 has a greater compression amount in the initial state, thereby providing a space basis for the shell 10 to slide relative to the top rod 30, and the to-be-driven piece 50 can have a greater stroke range in the working process, so that it can better adapt to the demand for driving stroke in different application scenarios, and improve the versatility and flexibility of the equipment.
[0043] Further, two sides of the shell 10 are provided with a first limiting piece 61 and a second limiting piece 62, wherein the first limiting piece 61 is in limiting abutment with the limiting end 32 of the top rod 30 to limit the movement of the top rod 30, so that when the elastic force of the memory alloy spring 20 becomes larger, the shell 10 and the to-be-driven member 50 can only be pulled to move away from the limiting end 32, thereby ensuring that the driving direction of the temperature-sensing driver 100 is consistent with the movement direction before the wax package. The second limiting piece 62 is in limiting abutment with one end of the reset spring 40 away from the to-be-driven member 50 to limit the movement of the reset spring 40, so that when the elastic force of the reset spring 40 is greater than the elastic force of the memory alloy spring 20, the to-be-driven member 50 is driven to move towards the limiting end 32. Through the arrangement of the first limiting piece 61 and the second limiting piece 62, the reset spring 40 and the top rod 30 are both limited, and the to-be-driven member 50 in the middle is pushed by the reset spring 40 and has a tendency to move towards the first limiting piece 61, and is connected with the temperature-sensing driver 100 and has a tendency to move towards the second limiting piece 62 when the memory alloy spring 20 is elongated. The two movement tendencies counteract and balance each other, and the elastic force of the memory alloy spring 20 changes with temperature changes, thereby breaking the balance and pushing the to-be-driven member 50 to slide left and right with temperature changes.
[0044] In the embodiment, one end of the reset spring 40 is in abutment with the second limiting piece 62, and the other end is in abutment with the to-be-driven member 50. When the temperature decreases, the elastic force of the reset spring 40 is greater than the elastic force of the memory alloy spring 20, so as to drive the to-be-driven member 50 to move towards the limiting end 32.
[0045] The to-be-driven member 50 is provided with a matching part, a first extension wall 51 and a limiting wall 52. The matching part is used for being connected with the connecting part 12, so that the stable connection of the shell 10 and the to-be-driven member 50 is realized, and the consistency of movement is realized. The first extension wall 51 extends outward from the matching part and is used for abutting against the other end of the reset spring 40. That is, one end of the reset spring 40 abuts against the second limiting part 62, and the other end abuts against the first extension wall 51. The first extension wall 51 provides a stable abutting surface for the reset spring 40, so that the elastic force of the reset spring 40 can be more directly and uniformly transmitted to the to-be-driven member 50. The optimization of the force transmission path reduces the energy loss, improves the working efficiency of the driver, and ensures that the to-be-driven member 50 can quickly respond to the driving force of the reset spring 40, and accurate control is realized. The limiting wall 52 is connected with the first extension wall 51 and surrounds the outer periphery of the matching part, and together with the matching part and the first extension wall 51, forms an abutting groove for accommodating the reset spring 40. The abutting groove provides a stable mounting position for the reset spring 40, ensures the reliable connection and force transmission between the reset spring 40 and the to-be-driven member 50, and provides protection for the linear movement of the reset spring 40.
[0046] The first extension wall 51 is further provided with a liquid flow hole for liquid flow.
[0047] In another optional embodiment, one end of the reset spring 40 abuts against the second limiting part 62, and the other end abuts against the shell 10. That is, the reset spring 40 directly drives the shell 10 to move, and drives the to-be-driven member 50 to move through the shell 10.
[0048] Specifically, the first end is provided with a second extension wall extending outward from the connecting part 12, and the second extension wall is used for abutting against the other end of the reset spring 40, that is, one end of the reset spring 40 abuts against the second limiting part 62, and the other end abuts against the second extension wall. By providing the second extension wall on the shell 10, the structural design on the to-be-driven member 50 can be omitted, and the application range of the temperature sensing driver 100 is improved.
[0049] Further, the shell 10 and the to-be-driven member 50 are both provided with a passage through which the top rod 30 passes. In this way, the linearity and stability of the top rod 30 during movement are ensured, and the working reliability and control accuracy of the temperature sensing driver 100 are improved.
[0050] Please refer to Figure 2 and Figure 3 The movement process of the temperature sensing driver 100 of the utility model is as follows:
[0051] When the temperature is low, the elastic force of the memory alloy spring 20 is smaller than the elastic force of the reset spring 40, the memory alloy spring 20 is compressed, and the reset spring 40 drives the to-be-driven member 50 to move towards the direction close to the limiting end 32. When the temperature rises, the elastic force of the memory alloy spring 20 gradually increases and is greater than the elastic force of the reset spring 40, and since the limiting end 32 of the top rod 30 is limited, the memory alloy spring 20 can pull the shell 10 and the to-be-driven member 50 to move away from the limiting end 32. When the temperature decreases, the elastic force of the reset spring 40 increases, and the to-be-driven member 50 is driven to move towards the direction close to the limiting end 32 again.
[0052] In summary, the temperature-sensitive driver 100 of the utility model can directly replace the wax package, has high universality and installation convenience, and when upgrading or maintaining the equipment, the original driving structure does not need to be complicatedly changed, only the wax package is directly removed, and the temperature-sensitive driver 100 of the utility model is replaced, the replacement cost and time cost are greatly reduced, and the equipment maintenance and upgrading efficiency is improved. In addition, the moving direction of the temperature-sensitive driver 100 of the utility model when the temperature rises and decreases is consistent with the original wax package driving, so that when the equipment is replaced, the mechanical parts and the control system connected thereto do not need to be re-adjusted or modified, the compatibility and stability of the equipment are ensured, the system adaptation problem caused by the replacement of the driving element is reduced, and the normal operation and control precision of the equipment are ensured.
[0053] By arranging the reset spring 40 and the memory alloy spring 20 on the same side and sleeving the reset spring 40 outside the memory alloy spring 20, the structure of the temperature-sensitive driver 100 is more compact, and the installation space is saved. Meanwhile, the design helps to optimize the force transmission path of the temperature-sensitive driver 100, improve the response speed and action accuracy of the temperature-sensitive driver 100, ensure that the memory alloy spring 20 can quickly and accurately stretch and contract when the temperature changes, so as to drive the to-be-driven member 50 to generate stable mechanical movement and realize accurate control of the equipment. In addition, the arrangement helps to balance the force distribution inside the temperature-sensitive driver 100, reduces the internal friction and wear caused by the unbalanced force, and further improves the reliability and service life of the temperature-sensitive driver 100.
[0054] The preferred embodiments of the utility model are described above, and the utility model is not limited to the above, and it should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made without departing from the technical principles of the utility model, and the improvements and modifications should be regarded as the protection scope of the utility model.
Claims
1. A temperature sensing driver, characterized by, The utility model relates to a temperature-driven device, comprising: a housing having a receiving cavity, the housing being provided with a connecting portion for connecting a to-be-driven member and a liquid passage communicating with the receiving cavity; a top rod movably connected to the housing and comprising an abutting end and a limiting end arranged oppositely, wherein the abutting end is arranged in the receiving cavity; a memory alloy spring arranged in the receiving cavity and abutting against one end of the housing and the other end of the abutting end, the memory alloy spring being configured to sense the temperature of liquid entering the receiving cavity through the liquid passage and drive the to-be-driven member to move away from the limiting end; a return spring arranged outside the housing and configured to drive the to-be-driven member to move towards the limiting end.
2. The temperature-sensitive driver of claim 1, wherein The housing is provided with a first limiting member and a second limiting member on two sides, wherein the first limiting member is in limiting abutment with the limiting end of the top rod, and the second limiting member is in limiting abutment with one end of the return spring away from the to-be-driven member.
3. The temperature-sensitive driver of claim 2, wherein, One end of the return spring is in abutment with the second limiting member, and the other end is in abutment with the to-be-driven member.
4. The temperature-sensitive driver of claim 3, wherein, The to-be-driven member is provided with a matching portion for connecting the connecting portion and a first extension wall extending outward from the matching portion, and the first extension wall is used for abutting against the other end of the return spring.
5. The temperature-sensitive driver of claim 4, wherein, The first extension wall is further provided with a limiting wall connected to the first extension wall and surrounding the outer periphery of the matching portion, and the matching portion, the first extension wall and the limiting wall jointly surround to form an abutting groove for accommodating the return spring.
6. The temperature sensing driver of claim 2, wherein, One end of the return spring is in abutment with the second limiting member, and the other end is in abutment with the housing.
7. The temperature-sensitive driver of claim 6, wherein The housing comprises a first end for connecting the to-be-driven member and a second end arranged oppositely to the first end, and the first end is provided with a second extension wall extending outward from the connecting portion, and the second extension wall is used for abutting against the other end of the return spring.
8. The temperature-sensitive driver of claim 7, wherein, The second end is provided with a groove and a snap spring, one end of the memory alloy spring is in abutment with the snap spring, and the other end is in abutment with the abutting end of the top rod.
9. The temperature sensing driver of claim 1, wherein, In parallel to the moving direction of the to-be-driven member, the length of the return spring is greater than the length of the memory alloy spring.
10. The temperature sensing driver of claim 1, wherein, The housing and the to-be-driven member are both provided with a channel for the top rod to pass through.