A thermal expansion valve

Abstract

The present invention discloses a thermal expansion valve, which belongs to the field of expansion valves. A thermal expansion valve comprises a valve body; the valve body is provided with a valve body inlet, a valve body outlet, an air cavity, an inlet cavity connected to the valve body inlet, and a valve cavity connected to the valve body outlet; a diaphragm is provided in the air cavity; a butt ring is provided between the inlet cavity and the valve cavity; a valve ball capable of sealing the butt ring is slidably connected in the valve cavity; the valve ball and the diaphragm are connected through a valve stem; a sliding seat is provided in the valve cavity below the valve ball; a compression spring is provided between the sliding seat and the valve ball; the thermal expansion valve also includes a driver that controls the position of the sliding seat in the valve cavity by magnetic force. This solution controls the movement of the adjusting rod by magnetic force, thereby controlling the movement of the sliding seat and changing the initial elastic force of the compression spring.

Description

Technical Field

[0001] The present invention belongs to the field of expansion valves, and more specifically, relates to a thermal expansion valve. Background Art

[0002] When the thermal expansion valve is not working, the compression spring will drive the valve ball to seal the thermal expansion valve, and the compression spring will have a certain preload force, that is, the initial elastic force. During the use of the thermal expansion valve, the diaphragm will drive the valve ball to move back and forth, and the compression spring in the thermal expansion valve will also move back and forth. With the reciprocating motion of the compression spring, the compression spring will undergo plastic deformation, resulting in a decrease in the initial elastic force. In the long run, the valve ball will not be able to seal the valve body, and the thermal expansion valve will not work properly.

[0003] When adjusting the initial elastic force of the compression spring of existing products, the thermal expansion valve needs to be disassembled and a tool needs to be inserted into the valve body through the port of the thermal expansion valve for adjustment, which is time-consuming and labor-intensive, and the thermal expansion valve is easily damaged during the disassembly process.

[0004] Alternatively, a hole is opened on the side wall of the valve body, and the adjusting rod is extended from the outside into the thermal expansion valve through the hole, and the adjusting rod is rotated outside to adjust the elastic force of the compression spring. This method opens a hole on the side wall of the valve body, and the position needs to be sealed. After long-term use, the hole has a safety hazard of air leakage. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a thermal expansion valve, which can adjust the elastic force of the compression spring without disassembling the thermal expansion valve.

[0006] A thermal expansion valve of the present invention comprises a valve body; the valve body is provided with a valve body inlet, a valve body outlet, an air cavity, an inlet cavity connected with the valve body inlet, and a valve cavity connected with the valve body outlet; a diaphragm is provided in the air cavity; an abutment ring is provided between the inlet cavity and the valve cavity; a valve ball capable of sealing the abutment ring is slidably connected in the valve cavity; the valve ball and the diaphragm are connected via a valve stem; a sliding seat is provided in the valve cavity below the valve ball; a compression spring is provided between the sliding seat and the valve ball; the thermal expansion valve also comprises a driver for controlling the position of the sliding seat in the valve cavity by magnetic force.

[0007] As a further improvement of the present invention, the diaphragm divides the air cavity into two cavities; one cavity is connected to the temperature sensing package, and the other cavity is connected to the external interface on the valve body; the external interface is connected to the rear side of the evaporator through a capillary tube.

[0008] As a further improvement of the present invention, the side wall of the valve cavity is symmetrically provided with an adjustment mechanism; the adjustment mechanism includes an adjustment rod sliding radially along the valve cavity, and an adjustment magnet fixedly connected to one end of the adjustment rod close to the outside of the valve cavity; the outer wall of the sliding seat is provided with an inclined surface; the adjustment rod is against the inclined surface.

[0009] As a further improvement of the present invention, the driver includes a shell and two driving magnets slidably connected in the shell; the sliding direction of the two driving magnets is parallel to the sliding direction of the adjusting rod; when the driver is placed on the valve body, the driving magnet and the adjusting magnet repel each other.

[0010] As a further improvement of the present invention, a pressure sensor for detecting the repulsive force between the driving magnet and the adjusting magnet is arranged at one end of the driving magnet away from the adjusting magnet; and a display screen for displaying the value of the pressure sensor is arranged on the shell.

[0011] As a further improvement of the present invention, the side wall of the adjusting rod is provided with a longitudinally distributed connecting seat; the connecting seat is provided with connecting teeth equidistantly arranged along the sliding direction of the adjusting rod; the connecting teeth are facing the direction of the adjusting rod; the adjusting mechanism also includes a stop frame slidably connected in the valve cavity; the stop frame is evenly provided with stop teeth that can be plugged into the connecting teeth to prevent the adjusting rod from sliding.

[0012] As a further improvement of the present invention, the adjusting mechanism also includes a stop magnet which slides radially along the valve cavity; the stop magnet is transmission-connected to the stop frame; the driving magnet is rotationally connected in the shell, and the rotating axis of the driving magnet passes through its own center of gravity and is parallel to the sliding direction of the driving magnet; a second magnet located in the middle and a first magnet located on both sides of the second magnet are arranged in the driving magnet; a reset spring for driving the stop magnet to reset is arranged between the stop magnet and the valve cavity; when the driving magnet rotates to vertical, the first magnet is opposite to the stop magnet, and the second magnet is opposite to the adjusting magnet; when the driving magnet rotates to horizontal, the first magnet is not opposite to the stop magnet, and the second magnet is opposite to the adjusting magnet.

[0013] As a further improvement of the present invention, two symmetrically arranged adjustment frames are slidably connected in the shell; the sliding direction of the adjustment frames is parallel to the sliding direction of the driving magnet; a driving magnet is rotatably connected to one adjustment frame; a synchronous gear is rotatably connected in the shell; and each of the adjustment frames is provided with an adjustment rack that meshes with the synchronous gear.

[0014] As a further improvement of the present invention, a reduction gear box is installed in the shell; the synchronous gear is connected to one end of the reduction gear box; the other end of the reduction gear box is provided with a handle wheel; the handle wheel is located outside the shell.

[0015] As a further improvement of the present invention, each of the adjustment frames is slidably connected with a rotating frame; the sliding direction of the rotating frame is perpendicular to the sliding direction of the adjustment frame; a magnetic gear is coaxially arranged on the driving magnet; a rotating rack meshing with the magnetic gear is arranged on the rotating frame; a sliding sleeve is slidably connected to the outer side of the shell, and the sliding sleeve is provided with an extension rod extending into the shell and clamped with the rotating frame.

[0016] Compared with the prior art, the beneficial effect of the present invention is that: the present solution controls the movement of the adjusting rod through magnetic force, thereby controlling the movement of the slide seat and changing the initial elastic force of the compression spring. When adjusting the initial elastic force of the compression spring, there is no need to disassemble the valve body, and the operation is convenient and quick. In addition, no additional holes are provided on the outer surface of the valve body, thereby not additionally reducing the air tightness of the valve body.

[0017] This solution sets an adjustment magnet to control the movement of the stop frame through magnetic force. When the compression spring is adjusted, the stop teeth on the stop frame will connect with the tooth insertion to prevent the adjustment rod from moving, thereby ensuring that the initial elastic force of the compression spring remains in the current state.

[0018] In this solution, by rotating the driving magnet, the driving magnet can cooperate with the adjusting magnet to change the initial elastic force of the clamping spring, and can also cooperate with the adjusting magnet to control the movement of the stop frame.

[0019] This solution sets a driver so that multiple thermal expansion valves can be adjusted by one driver, without the need to match one thermal expansion valve with one driver, thus saving costs.

[0020] This solution detects the repulsive force between the adjustment magnet and the second magnet through a pressure sensor, and then determines the elastic force in the current compression spring, which can change the initial elastic force of the compression spring more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the regulating mechanism of the present invention;

[0024] Figure 4 This is a structural schematic diagram of adjusting the compression spring of the present invention;

[0025] Figure 5 It is a schematic cross-sectional structural diagram of the driver of the present invention;

[0026] Figure 6 It is a schematic diagram of the exploded structure of the driver of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure when the driving magnet of the present invention is in a vertical state;

[0028] Figure 8 It is a schematic diagram of the structure when the driving magnet of the present invention is in a horizontal state.

[0029] Description of the numbers in the figure:

[0030] 1. Valve body; 11. Valve body inlet; 12. Valve body outlet; 13. External interface; 14. Valve cavity; 15. Inlet cavity; 16. Raised strip; 17. Air cavity; 18. Butt ring; 21. Temperature sensing bag; 22. Diaphragm; 23. Valve stem; 24. Valve ball; 25. Compression spring; 26. Sliding seat; 261. Inclined surface; 3. Adjustment mechanism; 31. Adjustment magnet; 32. Adjustment rod; 321. Connecting seat; 322. Connecting teeth; 33. Stop frame; 331. Stop teeth; 332 , slide groove; 34, stop magnet; 341, slide column; 35, return spring; 4, driver; 40, housing; 41, display screen; 42, socket; 43, movable groove; 5, driving magnet; 51, magnet gear; 52, first magnet; 53, second magnet; 61, rotating frame; 611, rotating rack; 62, sliding sleeve; 71, adjusting frame; 711, adjusting rack; 72, pressure sensor; 73, synchronous gear; 74, reduction gear box; 75, handle wheel. DETAILED DESCRIPTION

[0031] Specific embodiment 1: Please refer to Figure 1-Figure 8 A thermal expansion valve comprises a valve body 1; the valve body 1 is provided with a valve body inlet 11, a valve body outlet 12, an air cavity 17, an inlet cavity 15 connected with the valve body inlet 11, and a valve cavity 14 connected with the valve body outlet 12; a diaphragm 22 is arranged in the air cavity 17; a collar 18 is arranged between the inlet cavity 15 and the valve cavity 14; a valve ball 24 capable of sealing the collar 18 is slidably connected in the valve cavity 14; the valve ball 24 and the diaphragm 22 are connected via a valve stem 23; a slide seat 26 is arranged in the valve cavity 14 below the valve ball 24; a compression spring 25 is arranged between the slide seat 26 and the valve ball 24; the thermal expansion valve further comprises a driver 4 for controlling the position of the slide seat 26 in the valve cavity 14 by magnetic force.

[0032] The valve body 1 is entirely made of brass.

[0033] The diaphragm 22 divides the air cavity 17 into two cavities; one cavity is connected to the temperature sensing package 21, and the other cavity is connected to the external interface 13 on the valve body 1; the external interface 13 is connected to the rear side of the evaporator through a capillary tube.

[0034] The side wall of the valve cavity 14 is symmetrically provided with an adjustment mechanism 3; the adjustment mechanism 3 includes an adjustment rod 32 that slides radially along the valve cavity 14, and an adjustment magnet 31 fixedly connected to one end of the adjustment rod 32 close to the outside of the valve cavity 14; the outer wall of the slide seat 26 is provided with an inclined surface 261; the adjustment rod 32 abuts against the inclined surface 261.

[0035] The inclined surface 261 has an inclination angle of 45°.

[0036] The driver 4 includes a shell 40 and two driving magnets 5 slidably connected in the shell 40; the sliding direction of the two driving magnets 5 is parallel to the sliding direction of the adjusting rod 32; when the driver 4 is placed on the valve body 1, the driving magnets 5 and the adjusting magnet 31 repel each other.

[0037] A pressure sensor 72 for detecting the repulsive force between the driving magnet 5 and the adjusting magnet 31 is disposed at one end of the driving magnet 5 away from the adjusting magnet 31 ; a display screen 41 for displaying the value of the pressure sensor 72 is disposed on the housing 40 .

[0038] The repulsive force between the driving magnet 5 and the adjusting magnet 31 is detected by the pressure sensor 72, and the horizontal force of the adjusting rod 32 on the inclined surface 261 is determined. Since the inclined surface 261 is at 45°, the horizontal force of the adjusting rod 32 on the inclined surface 261 is approximately equal to the elastic force of the clamping spring 25 on the slide 26 (the gravity of the slide 26 itself is small and can be ignored), and the elastic force in the clamping spring 25 is determined by the pressure sensor 72.

[0039] The side wall of the adjusting rod 32 is provided with a longitudinally distributed connecting seat 321; the connecting seat 321 is provided with connecting teeth 322 equidistantly arranged along the sliding direction of the adjusting rod 32; the connecting teeth 322 are facing the direction of the adjusting rod 32; the adjusting mechanism 3 also includes a stop frame 33 slidably connected in the valve cavity 14; the stop frame 33 is evenly provided with stop teeth 331 that can be plugged into the connecting teeth 322 to prevent the adjusting rod 32 from sliding.

[0040] The regulating mechanism 3 also includes a stop magnet 34 that slides radially along the valve cavity 14; the stop magnet 34 is transmission-connected to the stop frame 33; the driving magnet 5 is rotationally connected in the housing 40, and the rotation axis of the driving magnet 5 passes through its own center of gravity and is parallel to the sliding direction of the driving magnet 5; the driving magnet 5 is provided with a second magnet 53 located in the middle and a first magnet 52 located on both sides of the second magnet 53; a stop magnet 34 is provided between the stop magnet 34 and the valve cavity 14 for driving the stop magnet 34. The reset spring 35 resets the magnet 34; when the driving magnet 5 rotates to vertical, the length direction of the driving magnet 5 is parallel to the vertical plane, the first magnet 52 is opposite to the stopping magnet 34, and the second magnet 53 is opposite to the adjusting magnet 31. At this time, the driving magnet 5 and the stopping magnet 34 attract each other; when the driving magnet 5 rotates to horizontal, the width direction of the driving magnet 5 is parallel to the vertical plane, the first magnet 52 is not opposite to the stopping magnet 34, and the second magnet 53 is opposite to the adjusting magnet 31.

[0041] The stop frame 33 is provided with an inclined sliding groove 332; the stop magnet 34 is provided with a sliding column 341 slidably connected to the sliding groove 332; when the stop magnet 34 slides radially along the valve cavity 14, the stop frame 33 slides synchronously through the cooperation of the sliding column 341 and the sliding groove 332, thereby controlling the relative relationship between the stop tooth 331 and the connecting tooth 322.

[0042] The pressure sensor 72 is used to detect the pressure of the second magnet 53. The second magnet 53 can slightly move in the driving magnet 5, ensuring that the pressure sensor 72 only detects the pressure of the second magnet 53, while the force between the first magnet 52 and the stop magnet 34 is not transmitted to the pressure sensor 72.

[0043] Two symmetrically arranged adjustment frames 71 are slidably connected in the shell 40; the sliding direction of the adjustment frames 71 is parallel to the sliding direction of the driving magnet 5; one driving magnet 5 is rotatably connected to one adjustment frame 71; the pressure sensor 72 is fixedly connected to the adjustment frame 71; a synchronous gear 73 is rotatably connected in the shell 40; each of the adjustment frames 71 is provided with an adjustment rack 711 meshing with the synchronous gear 73.

[0044] A reduction gear box 74 is installed in the housing 40 ; the synchronous gear 73 is connected to one end of the reduction gear box 74 ; a handle wheel 75 is provided at the other end of the reduction gear box 74 ; the handle wheel 75 is located outside the housing 40 .

[0045] Through the reduction gear box 74 , the transmission ratio between the handle wheel 75 and the synchronous gear 73 is 20:1, and the movement distance of the driving magnet 5 can be precisely controlled by the rotation of the handle wheel 75 .

[0046] Each of the adjustment frames 71 is slidably connected to a rotating frame 61; the sliding direction of the rotating frame 61 is perpendicular to the sliding direction of the adjustment frame 71; a magnetic gear 51 is coaxially arranged on the driving magnet 5; a rotating rack 611 meshing with the magnetic gear 51 is arranged on the rotating frame 61; a sliding sleeve 62 whose sliding direction is parallel to the rotating frame 61 is slidably connected to the outer side of the shell 40; an extension rod extending into the shell 40 and engaged with the rotating frame 61 is arranged on the sliding sleeve 62.

[0047] The sliding sleeve 62 and the rotating frame 61 move synchronously along the sliding direction of the sliding sleeve 62 ; when the adjusting frame 71 drives the rotating frame 61 to move along the sliding direction of the adjusting frame 71 , the sliding sleeve 62 and the rotating frame 61 slide relatively.

[0048] The front side of the housing 40 is provided with a socket 42 plugged into the outer wall of the valve body 1 ; the side wall of the socket 42 is provided with a movable groove 43 for the driving magnet 5 to move; the outer wall of the valve body 1 is provided with a convex strip 16 for positioning the housing 40 .

[0049] The stop magnet 34 , the adjustment magnet 31 , and the driving magnet 5 are all neodymium magnets, which have strong magnetic force and are not easy to decay.

[0050] Initially, the return spring 35 pushes the stop magnet 34 to the limit position close to the inner side of the valve cavity 14. Through the cooperation between the slide groove 332 and the slide column 341, the stop tooth 331 is plugged into the connecting tooth 322, and the adjustment rod 32 cannot move. The driving magnet 5 in the driver 4 is in a vertical state.

[0051] Before adjusting the elastic force of the compression spring 25 , the thermal expansion valve does not work, and the valve ball 24 is sealed against the abutment ring 18 only under the action of the compression spring 25 .

[0052] When the expansion valve needs to adjust the elastic force of the compression spring 25, the socket 42 of the driver 4 is inserted into the valve body 1, and the driver 4 is abutted against the convex strip 16. At this time, the second magnet 53 is opposite to the adjusting magnet 31, and because the driving magnet 5 is in a vertical state, the first magnet 52 is opposite to the stopping magnet 34.

[0053] When the first magnet 52 and the stop magnet 34 are facing each other, the first magnet 52 and the stop magnet 34 attract each other, and the stop magnet 34 overcomes the elastic force of the return spring 35 and moves toward the outside of the valve cavity 14. At the same time, the slide post 341 on the stop magnet 34 cooperates with the slide groove 332, so that the stop frame 33 slides, the stop tooth 331 is separated from the connecting tooth 322, and then the adjusting rod 32 can move freely.

[0054] Then the operator turns the handle wheel 75, and the adjustment frame 71 drives the driving magnet 5 to approach or move away from the adjustment magnet 31 through the transmission of the reduction gear box 74 and the synchronous gear 73. At the same time, the pressure sensor 72 detects the pressure of the driving magnet 5 on the pressure sensor 72.

[0055] When the driving magnet 5 approaches the adjusting magnet 31, the repulsive force between the driving magnet 5 and the adjusting magnet 31 increases, and then the adjusting magnet 31 moves toward the inside of the valve cavity 14 under the action of the repulsive force, and the adjusting magnet 31 drives the adjusting rod 32 to move synchronously, and the adjusting rod 32 abuts against the inclined surface 261. Then the sliding sleeve 62 moves upward, and the initial elastic force of the clamping spring 25 increases. Similarly, when the driving magnet 5 moves away from the adjusting magnet 31, the initial elastic force of the clamping spring 25 decreases.

[0056] When it is observed that the required value is displayed on the display screen 41, it is proved that the initial elastic force of the compression spring 25 at this time reaches the required value.

[0057] Then slide the sleeve 62, the sleeve 62 drives the rotating frame 61 to move synchronously, and then the rotating rack 611 engages with the magnet gear 51, forcing the driving magnet 5 to rotate 90°, and the driving magnet 5 changes from a vertical state to a horizontal state. At this time, the two sides of the driving magnet 5 will not be directly opposite to the stop magnet 34. Then, the stop magnet 34 moves to the outside of the valve cavity 14 under the action of the reset spring 35, and the stop frame 33 moves through the cooperation of the slide column 341 and the slide groove 332, and then the stop tooth 331 is plugged with the connecting tooth 322, so that the adjusting rod 32 cannot slide. Then the adjusting rod 32 remains in this position. In the above process, the driving magnet 5 is always directly opposite to the adjusting magnet 31, and the adjusting magnet 31 and the adjusting rod 32 will not move.

[0058] Then, the driver 4 is removed from the valve body 1 and the sliding sleeve 62 is pushed so that the driving magnet 5 changes from a horizontal state to a vertical state again, so as to facilitate the next use.

Claims

1. A thermal expansion valve, comprising a valve body; the valve body is provided with a valve body inlet, a valve body outlet, an air cavity, an inlet cavity connected to the valve body inlet, and a valve cavity connected to the valve body outlet; a diaphragm is provided in the air cavity; characterized in that: A butt ring is arranged between the inlet cavity and the valve cavity; a valve ball capable of sealing the butt ring is slidably connected in the valve cavity; the valve ball and the diaphragm are connected through a valve stem; a sliding seat is arranged in the valve cavity below the valve ball; a compression spring is arranged between the sliding seat and the valve ball; the thermal expansion valve also includes a driver that controls the position of the sliding seat in the valve cavity by magnetic force; The side wall of the valve cavity is symmetrically provided with an adjustment mechanism; the adjustment mechanism comprises an adjustment rod sliding along the radial direction of the valve cavity, and an adjustment magnet fixedly connected to one end of the adjustment rod close to the outside of the valve cavity; the outer wall of the sliding seat is provided with an inclined surface; the adjustment rod abuts against the inclined surface; The driver comprises a housing and two driving magnets slidably connected in the housing; the sliding direction of the two driving magnets is parallel to the sliding direction of the adjusting rod; when the driver is placed on the valve body, the driving magnets and the adjusting magnets repel each other; The side wall of the regulating rod is provided with a longitudinally distributed connecting seat; the connecting seat is provided with connecting teeth equidistantly along the sliding direction of the regulating rod; the connecting teeth face the direction of the regulating rod; the regulating mechanism also includes a stop frame slidably connected in the valve cavity; the stop frame is evenly provided with stop teeth that can be plugged with the connecting teeth to prevent the regulating rod from sliding; The adjusting mechanism also includes a stop magnet which slides radially along the valve cavity; the stop magnet is transmission-connected to the stop frame; the driving magnet is rotationally connected in the shell, and the rotating axis of the driving magnet passes through its own center of gravity and is parallel to the sliding direction of the driving magnet; a second magnet located in the middle and a first magnet located on both sides of the second magnet are arranged in the driving magnet; a reset spring for driving the stop magnet to reset is arranged between the stop magnet and the valve cavity; when the driving magnet rotates to vertical, the first magnet is opposite to the stop magnet, and the second magnet is opposite to the adjusting magnet; when the driving magnet rotates to horizontal, the first magnet is not opposite to the stop magnet, and the second magnet is opposite to the adjusting magnet.

2. A thermal expansion valve according to claim 1, characterized in that: The diaphragm divides the air cavity into two cavities; one cavity is connected to the temperature sensing package, and the other cavity is connected to the external interface on the valve body; the external interface is connected to the rear side of the evaporator through a capillary tube.

3. A thermal expansion valve according to claim 1, characterized in that: A pressure sensor for detecting the repulsive force between the driving magnet and the adjusting magnet is arranged at one end of the driving magnet away from the adjusting magnet; and a display screen for displaying the value of the pressure sensor is arranged on the shell.

4. A thermal expansion valve according to claim 1, characterized in that: Two symmetrically arranged adjustment frames are slidably connected in the shell; the sliding direction of the adjustment frames is parallel to the sliding direction of the driving magnet; one driving magnet is rotatably connected to one adjustment frame; a synchronous gear is rotatably connected in the shell; each of the adjustment frames is provided with an adjustment rack meshing with the synchronous gear.

5. A thermal expansion valve according to claim 4, characterized in that: A reduction gear box is installed in the shell; the synchronous gear is connected to one end of the reduction gear box; the other end of the reduction gear box is provided with a handle wheel; the handle wheel is located outside the shell.

6. A thermal expansion valve according to claim 4, characterized in that: Each of the adjustment frames is slidably connected to a rotating frame; the sliding direction of the rotating frame is perpendicular to the sliding direction of the adjustment frame; a magnetic gear is coaxially arranged on the driving magnet; a rotating rack meshing with the magnetic gear is arranged on the rotating frame; a sliding sleeve is slidably connected to the outer side of the shell, and the sliding sleeve is provided with an extension rod extending into the shell and clamped with the rotating frame.

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