A puller type electrothermal actuator

Abstract

This application relates to a pull-type electrothermal actuator, including a valve body, a connecting seat movably connected to the valve body, and an adjustment mechanism disposed within the connecting seat. The adjustment mechanism includes a rotary drive assembly and a sealing assembly. The sealing assembly includes a pull rod and a sealing element connected to the pull rod. The sealing element is movably connected to the valve body. The rotary drive assembly is connected to the pull rod. When the rotary drive assembly rotates along the connecting seat, the pull rod follows the rotary drive assembly to move along the valve body to block or open the valve. This application has the effect of avoiding the valve core not being able to fully abut against the valve seat, or the valve core not being able to smoothly separate from the valve seat.

Description

Technical Field

[0001] This application relates to the field of electrothermal actuator technology, and in particular to a pull-up electrothermal actuator. Background Technology

[0002] Electric actuators are key water circuit control components for achieving precise temperature control in fan coil units (core terminal equipment of central air conditioning). The core of the actuator drives the two-way or three-way valve through the conversion of electric, heat and mechanical energy. After being energized, its actuator controls the working state of the valve to regulate the on / off and flow of cold / hot water (or refrigerant).

[0003] Among them, Chinese utility model patent, publication (announcement) number: CN220770300U, discloses a fan coil electric heating actuator, including a mounting base, a support housing threadedly connected to the outer side of the top end face of the mounting base; a protective auxiliary structure disposed on the outer side of the support housing; a drive auxiliary structure disposed on the lower side of the inner end of the protective housing; a valve core disposed on the lower side of the inner end of the support housing; and a spring pressure control structure disposed on the inner side of the connection between the valve core and the piston. This effectively isolates the airflow between the support housing and the protective housing, greatly preventing the flow and intrusion of water vapor in the valve body towards the protective housing and the inner end of the temperature-sensitive paraffin, ensuring the service life of the thermistor and the normal application of the electric heating actuator, as well as the performance of this electric heating actuator in practical applications.

[0004] However, in practical applications, the inventors discovered that during the process of closing the valve by controlling the valve body, in the process of separating the valve core from the valve seat by the upward sliding of the guide column and the positioning frame, and at the same time, the pressure plate squeezes the elastic traction component to open the valve port in the valve body connected to the actuator, as the number of opening and closing increases, the elastic potential energy of the elastic traction component will gradually weaken during the repeated compression and release process, causing the valve to be unable to fully abut against the valve seat, affecting the sealing performance of the valve body, resulting in poor performance and room for improvement. Utility Model Content

[0005] The purpose of this utility model is to provide a pull-type electric heating actuator to avoid the valve core not being able to fully contact the valve seat or the valve core not being able to smoothly separate from the valve seat.

[0006] To achieve the above objectives, the present application provides a pull-up type electrothermal actuator with the following technical solution:

[0007] A pull-type electrothermal actuator includes a valve body with a connecting seat movably connected to it. An adjusting mechanism is disposed within the connecting seat. The adjusting mechanism includes a rotation drive assembly and a sealing assembly. The sealing assembly includes a pull rod and a sealing element connected to the pull rod. The sealing element is movably connected to the valve body. The rotation drive assembly is connected to the pull rod. When the rotation drive assembly rotates along the connecting seat, the pull rod follows the rotation drive assembly to move along the valve body to either block or open the valve.

[0008] Preferably, the rotation drive assembly includes a micro motor, a threaded seat, and a threaded connecting rod. The threaded seat is disposed within the connecting seat, the threaded connecting rod is threadedly engaged with the threaded seat, the output shaft of the micro motor is coaxially fixed with the threaded connecting rod, and the lifting rod is movably connected to the threaded connecting rod.

[0009] Preferably, the threaded connecting rod has a slot at the end away from the output shaft of the micro motor, and the lifting rod has a locking position that engages with the slot.

[0010] Preferably, the connecting seat has an integrally formed connecting part at one end near the valve body, the connecting part has a plurality of snap positions arranged circumferentially, a stress relief port is preset between every two adjacent snap positions, and a threaded sleeve is provided on the connecting part, the threaded sleeve is threadedly engaged with the valve body.

[0011] Preferably, the valve body has an integrally formed guide portion, which is threadedly engaged with the threaded sleeve. The guide portion has a guide hole extending through it along the axial direction, and the diameter of the guide hole is in a transition fit with the diameter of the lifting rod.

[0012] Preferably, it further includes a reset assembly, which includes a compression spring sleeved on the lifting rod and located between the threaded connecting rod and the guide portion.

[0013] Preferably, a main control circuit board is provided inside the connector, and the main control circuit board is electrically connected to the micro motor.

[0014] Preferably, the reset assembly further includes a reset spring, which is sleeved on the lifting rod and located between the threaded seat and the threaded connecting rod. A pressure sensor is provided at one end of the threaded seat near the reset spring, and the pressure sensor is electrically connected to the main control circuit board.

[0015] Compared with the prior art, this utility model provides a pull-up type electrothermal actuator, which has the following beneficial effects:

[0016] 1. The lifting rod is connected to the rotary drive assembly. By controlling the working state of the rotary drive assembly, the lifting rod carries the sealing seat to move along the valve body to block or open the valve, instead of using an elastic traction element to drive the valve core to block the valve body. The power applied by the rotary drive assembly drives the lifting rod to move. This achieves the forced movement of the lifting rod by the driving force applied by the rotary drive assembly, which has high reliability and avoids problems such as the valve core not being able to fully abut against the valve seat or the valve core not being able to smoothly separate from the valve seat.

[0017] 2. Through the cooperation of the slot and the locking position, the lifting rod and the threaded connecting rod can be quickly connected, so as to limit the lifting rod, which is convenient for assembly and has high stability;

[0018] 3. During the process of the lifting rod carrying the seal to seal the valve body, the pressure sensor and the return spring work together to detect the pressure on the threaded seat. When the force applied by the return spring to the threaded seat reaches the set threshold, it indicates that the seal has completely sealed the valve body. This effectively solves the problem that when the output shaft of the micro motor drives the threaded connecting rod to rotate along the threaded seat to drive the lifting rod to carry the seal to seal the valve body, the threaded connecting rod applies too much force to the lifting rod, causing deformation of the lifting rod, or the seal is damaged due to excessive force. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a pull-up type electrothermal actuator according to an embodiment of this application.

[0020] Figure 2 yes Figure 1 A cross-sectional structural diagram of a pull-up type electric heating actuator.

[0021] Figure 3 This is a schematic diagram showing the cooperation relationship between the rotating part, the micro motor, and the threaded connecting rod in a pull-type electric heating actuator according to an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the connecting seat in a pull-up type electric heating actuator according to an embodiment of this application.

[0023] Figure 5 This is a schematic diagram showing the fit between the lifting rod and the seal in a lifting-type electrothermal actuator according to an embodiment of this application.

[0024] Explanation of reference numerals in the attached drawings: 1. Valve body; 2. Connecting seat; 21. Connecting part; 22. Snap-in position; 3. Adjusting mechanism; 31. Rotation drive assembly; 311. Micro motor; 312. Threaded seat; 313. Threaded connecting rod; 32. Sealing assembly; 321. Lifting rod; 322. Seal; 4. Slot; 41. Through section; 42. Limiting section; 5. Snap-in position; 6. Stress relief port; 7. Threaded sleeve; 71. Snap-in platform; 8. Guide part; 81. Guide hole; 9. Reset assembly; 91. Compression spring; 92. Reset spring; 10. Pressure sensor; 11. Main control circuit board; 12. Limiting platform; 13. Rotating part; 14. Retaining ring; 15. Limiting plate. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0026] This application discloses a pull-up type electrothermal actuator. (Refer to...) Figure 1 and Figure 2 A pull-type electric heating actuator includes a valve body 1, a connecting seat 2 movably connected to the valve body 1, and an adjusting mechanism 3 disposed in the connecting seat 2. The adjusting mechanism 3 includes a rotation drive assembly 31 and a sealing assembly 32. The sealing assembly 32 includes a pull rod 321 and a sealing element 322 connected to the pull rod 321. The sealing element 322 is movably connected to the valve body 1. When the rotation drive assembly 31 rotates along the connecting seat 2, the pull rod 321 follows the rotation drive assembly 31 to move along the valve body 1 to block or open the valve.

[0027] First, it should be noted that in this embodiment, preferably, the valve body 1 is a two-way valve. One end of the valve body 1 is connected to the return water end of the fan coil unit, and the other end is connected to the supply water end of the fan coil unit. The valve body 1 is made of copper material to improve its corrosion resistance. The specific composition and working principle of the valve body 1 will not be described in detail here.

[0028] Specifically, the connecting seat 2 is movably connected to the control port of the valve body 1, and the inlet and outlet of the valve body 1 are sealed by the sealing element 322, so as to block the liquid flowing inside the valve body 1.

[0029] The seal 322 can be made of soft plastic or silicone material. In this embodiment, preferably, the seal 322 is made of rubber material, which gives it the properties of easy deformation and corrosion resistance. The lifting rod 321 has a threaded section at one end near the seal 322, and a limiting piece 15 is fixed at the threaded section of the lifting rod 321. The seal 322 passes through the threaded section, and the limiting piece 15 limits the installation position of the seal 322 along the lifting rod 321. After the seal 322 is installed on the lifting rod 321, the nut is threaded into the threaded section to stably fix the seal 322 on the lifting rod 321.

[0030] Meanwhile, a limiting platform 12 is integrally formed inside the valve body 1. When the sealing element 322 blocks the valve body 1 to restrict the flow of liquid inside the valve body 1, the limiting platform 12 limits the path of the sealing element 322 along the valve body 1, thereby improving the sealing performance of the sealing element 322.

[0031] Furthermore, refer to Figure 2 and Figure 3 The rotation drive assembly 31 includes a micro motor 311, a threaded seat 312, and a threaded connecting rod 313. The threaded seat 312 is disposed in the connecting seat 2. The threaded connecting rod 313 is threadedly engaged with the threaded seat 312. The output shaft of the micro motor 311 is coaxially fixed with the threaded connecting rod 313. The lifting rod 321 is movably connected to the threaded connecting rod 313.

[0032] Specifically, a rotating part 13 is fixed on the housing of the micro motor 311 (which has a reduction capability to increase the torque of the output shaft of the micro motor 311 when rotating). The rotating part 13 is covered on the connecting seat 2. The micro motor 311 is protected by the rotating part 13, which improves the safety performance and also makes it easy for the operator to drive the threaded connecting rod 313 to rotate along the threaded seat 312 by rotating the rotating part 13.

[0033] Meanwhile, the threaded connecting rod 313 has a slot 4 at the end away from the output shaft of the micro motor 311, and the lifting rod 321 has a locking position 5 along the axial side wall to the axis of the lifting rod 321 at the end away from the seal 322. The locking position 5 engages with the slot 4.

[0034] The slot 4 includes a through section 41 and a limiting section 42. The through section 41 is connected to the limiting section 42. The diameter of the through section 41 is larger than the outer diameter of the lifting rod 321. The width of the limiting section 42 and the tolerance of the locking position 5 are in clearance fit, so that the lifting rod 321 can slide smoothly along the limiting section 42 through the locking position 5, and the limiting section 42 limits the installation position of the lifting rod 321 along the threaded connection section.

[0035] During assembly, the end of the lifting rod 321 with the locking position 5 is placed inside the through section 41, and the locking position 5 of the lifting rod 321 is driven to slide along the through section 41 toward the limiting section 42 until the lifting rod 321 is engaged with the limiting section 42 through the locking position 5.

[0036] Reference Figure 2 and Figure 4 The connecting seat 2 has an integrally formed connecting part 21 at one end near the valve body 1. The connecting part 21 has a number of snap positions 22 arranged circumferentially. A stress relief port 6 is preset between every two adjacent snap positions 22. A threaded sleeve 7 is provided on the connecting part 21, and the threaded sleeve 7 is threadedly engaged with the valve body 1.

[0037] Specifically, the fastener 22 is formed by the outer wall of the connecting part 21 protruding in the circumferential direction away from the connecting seat 2. The width of the stress relief port 6 formed between two adjacent fasteners 22 is smaller than the width of the fastener 22. The connecting part 21 is made of an elastic material, such as stainless steel. In this embodiment, preferably, the connecting part 21 is made of plastic material so that it has the ability to recover its deformation.

[0038] Furthermore, the end of the snap-fit ​​22 facing the control port of the valve body 1 is chamfered. The threaded sleeve 7 expands along the axial direction to the edge of the threaded sleeve 7 to form a locking platform 71. In the actual assembly process, the snap-fit ​​22 of the connecting part 21 is first abutted against the locking platform 71, and a force is applied to the connecting part 21. Since there is a stress relief port 6 between two adjacent snap-fits 22, when a force is applied to the connecting part 21, the snap-fit ​​22 deforms, thereby reducing the diameter of the area enclosed by several snap-fits 22. Through the guiding effect of the chamfer of the snap-fit ​​22, the snap-fit ​​22 and the locking platform 71 are locked together, so as to achieve the purpose of stably fitting the threaded sleeve 7 onto the connecting seat 2.

[0039] Correspondingly, a guide portion 8 is integrally formed on the valve body 1, and the guide portion 8 is threadedly engaged with the threaded sleeve 7.

[0040] The guide part 8 and the connecting part 21 can be quickly and securely connected by the threaded sleeve 7, thereby achieving the purpose of stably fixing the connecting seat 2 to the valve body 1, which is easy to operate.

[0041] Meanwhile, the guide part 8 has a guide hole 81 extending through it along the axial direction. The diameter of the guide hole 81 and the diameter of the lifting rod 321 are in a transition fit.

[0042] Therefore, as the lifting rod 321 follows the threaded connecting rod 313 along the movement, the guide hole 81 guides the lifting rod 321 to move stably along the valve body 1, so as to prevent the lifting rod 321 from swaying when it carries the sealing element 322 along the valve body 1. At the same time, it realizes the isolation between the control port of the valve body 1 and the connecting seat 2, reducing the amount of liquid entering the connecting seat 2.

[0043] Reference Figure 2 , Figure 3 as well as Figure 5 It also includes a reset assembly 9, which includes a compression spring 91. The compression spring 91 is sleeved on the lifting rod 321 and is located between the threaded connecting rod 313 and the guide part 8.

[0044] Specifically, the lifting rod 321 has an integrally formed retaining ring 14 in the area between the locking position 5 and the seal 322, and the compression spring 91 is located between the guide part 8 and the retaining ring 14.

[0045] Therefore, during the movement of the lifting rod 321 carrying the sealing element 322, there is a gap between the locking 5 of the lifting rod 321 and the limiting section 42, and there is also a gap between the threaded connecting rod 313 and the threaded sleeve 7. Thus, during the actual movement, the compression spring 91 applies a reaction force to the lifting rod 321 following the movement of the threaded connecting rod 313, so that the lifting rod 321 always abuts against the threaded connecting rod 313 during the movement. This avoids the problem that the sealing element 322 cannot fully abut against the limiting platform 12 due to the gap between the locking 5 of the lifting rod 321 and the limiting section 42, and the gap between the threaded connecting rod 313 and the threaded sleeve 7, which would prevent the valve body 1 from being switched on or off.

[0046] Furthermore, refer to Figure 2 and Figure 3 The main control circuit board 11 is provided in the connector 2. The main control circuit board 11 is electrically connected to the micro motor 311. The main control circuit board 11 is used to interact with the controller of the fan coil unit to receive and execute the control commands issued by the fan coil unit, and to provide electrical signal feedback to the controller of the fan coil unit. Its specific composition and working principle will not be described in detail here.

[0047] When the main control circuit board 11 receives the valve opening or closing signal from the controller of the fan coil unit, the main control circuit board 11 processes the received signal and controls the micro motor 311 to start working, so as to drive the output shaft of the micro motor 311 to drive the threaded connecting rod 313 to rotate along the threaded seat 312.

[0048] Correspondingly, the reset assembly 9 also includes a reset spring 92, which is sleeved on the lifting rod 321 and located between the threaded seat 312 and the threaded connecting rod 313. A pressure sensor 10 is provided at one end of the threaded seat 312 near the reset spring 92, and the pressure sensor 10 is electrically connected to the main control circuit board 11.

[0049] When the output shaft of the micro motor 311 drives the threaded connecting rod 313 to rotate along the threaded seat 312, the return spring 92 will gradually release its elastic potential energy. At the same time, the pressure sensor 10 continuously detects the change in the force exerted by the return spring 92 on the threaded seat 312. When the pressure sensor 10 detects that the force exerted by the return spring 92 on the threaded seat 312 has decreased to a set threshold (set according to the effective formation of the threaded connecting rod 313 and the effective length of the lifting rod 321, which is not limited here), it indicates that the seal 322 has sealed the valve body 1. This avoids the probability that the seal 322 will be damaged or the lifting rod 321 will be deformed because the output shaft of the micro motor 311 continues to drive the threaded connecting rod 313 to rotate along the threaded seat 312.

[0050] The implementation principle of the pull-type electric heating actuator in this application embodiment is as follows: When it is necessary to block the valve body 1, the output shaft of the micro motor 311 drives the threaded connecting rod 313 to rotate along the threaded seat 312, thereby causing the threaded connecting rod 313 to move along the threaded seat 312 towards the control port of the valve body 1. Since the lifting rod 321 is movably connected to the limiting section 42 through the locking position 5, during the process of the threaded connecting rod 313 moving towards the control port of the valve body 1, the lifting rod 321 moves linearly towards the control port of the valve body 1 until the sealing member 322 abuts against the limiting platform 12, thereby achieving the purpose of blocking the liquid flow in the valve body 1. Compared with the method of using an elastic traction member for reset, the liquid on / off response of the electric heating actuator controlled by this application is faster and more stable, effectively solving the problem that the valve core cannot fully abut against the valve seat, or that the valve core cannot smoothly separate from the valve seat.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pull-up type electrothermal actuator, characterized in that: The device includes a valve body (1), on which a connecting seat (2) is movably connected. An adjusting mechanism (3) is provided inside the connecting seat (2). The adjusting mechanism (3) includes a rotation drive assembly (31) and a sealing assembly (32). The sealing assembly (32) includes a lifting rod (321) and a sealing element (322) connected to the lifting rod (321). The sealing element (322) is movably connected to the valve body (1). The rotation drive assembly (31) is connected to the lifting rod (321). When the rotation drive assembly (31) rotates along the connecting seat (2), the lifting rod (321) follows the rotation drive assembly (31) to move along the valve body (1) to block or open the valve.

2. A puller electrically heated actuator according to claim 1, characterized in that: The rotation drive assembly (31) includes a micro motor (311), a threaded seat (312), and a threaded connecting rod (313). The threaded seat (312) is disposed in the connecting seat (2). The threaded connecting rod (313) is threadedly engaged with the threaded seat (312). The output shaft of the micro motor (311) is coaxially fixed with the threaded connecting rod (313). The lifting rod (321) is movably connected to the threaded connecting rod (313).

3. A puller electrically heated actuator according to claim 2, characterised in that: The threaded connecting rod (313) has a slot (4) at the end away from the output shaft of the micro motor (311), and a locking position (5) is provided on the lifting rod (321), which engages with the slot (4).

4. A puller electrically heated actuator according to claim 3, characterised in that: The connecting seat (2) has an integrally formed connecting part (21) at one end near the valve body (1). The connecting part (21) has a plurality of snap positions (22) arranged circumferentially. A stress relief port (6) is preset between every two adjacent snap positions (22). A threaded sleeve (7) is provided on the connecting part (21), and the threaded sleeve (7) is threadedly engaged with the valve body (1).

5. A puller-type electrothermal actuator according to claim 4, characterised in that: The valve body (1) is integrally formed with a guide part (8), which is threadedly engaged with the threaded sleeve (7). The guide part (8) has a guide hole (81) through it along the axial direction. The diameter of the guide hole (81) and the diameter tolerance of the lifting rod (321) are in a transition fit.

6. A puller-type electrothermal actuator according to claim 5, characterised in that: It also includes a reset assembly (9), which includes a compression spring (91) sleeved on the lifting rod (321) and located between the threaded connecting rod (313) and the guide portion (8).

7. A puller-type electrothermal actuator according to claim 6, characterised in that: The connector (2) is equipped with a main control circuit board (11), which is electrically connected to the micro motor (311).

8. A puller electrically heated actuator according to claim 7, characterised in that: The reset assembly (9) also includes a reset spring (92), which is sleeved on the lifting rod (321) and located between the threaded seat (312) and the threaded connecting rod (313). A pressure sensor (10) is provided at one end of the threaded seat (312) near the reset spring (92), and the pressure sensor (10) is electrically connected to the main control circuit board (11).

Images