Thermal expansion valve

Abstract

The utility model discloses a thermostatic expansion valve and relates to the technical field of valves, the thermostatic expansion valve comprises a main body, a resistance adjusting mechanism is arranged in the main body, through the structural arrangement, the thermostatic expansion valve can drive a lead screw to rotate through a rotary knob, so that a sliding block is driven to horizontally move, and the resistance is adjusted along with the horizontal movement of the sliding block. A roller at the top of the sliding block is attached to the inclined face of a trigger block, the roller drives the trigger block to vertically move upwards along with continuous movement of the sliding block, accordingly, a jacking disc vertically moves upwards, the stretching amount of a spring is gradually reduced, the upward thrust of the spring to a resistance plate is increased, and the resistance plate is lifted. The resistance plate is arranged on the valve element, so that the resistance generated by the resistance plate when the valve element vertically moves downwards is larger, the vertical movement speed of the valve element is slower in the process that the downward thrust of the driving rod is increased, the opening and closing size of the valve in the main body is more accurately controlled, and precise regulation and control over the refrigerant flow are facilitated.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a thermal expansion valve. Background Art

[0002] Thermostatic expansion valve is a device that controls the refrigerant flow by changing the cross-sectional area of ​​the channel. It uses the change in the refrigerant superheat at the evaporator outlet to adjust the valve opening, thereby controlling the refrigerant flow entering the evaporator.

[0003] As shown in Chinese patent publication number CN210050354U, a thermal expansion valve still has the following shortcomings in actual use:

[0004] When the thermal expansion valve of the above-mentioned patent is actually used, the spring provides resistance to the movement of the valve core, but the expansion and contraction amount of the spring is always a fixed distance. As the use environment of the valve body is different, in some cases the valve core needs to be able to quickly regulate the refrigerant flow, thereby quickly adjusting the internal refrigerant flow, and sometimes the movement distance of the valve core needs to be finer, and the flow change of the refrigerant inside the valve body needs to be more finely regulated, which requires the spring to have a greater resistance to the valve core. A spring with a fixed expansion and contraction amount cannot achieve the effect of resistance regulation. Utility Model Content

[0005] In order to improve the problem that the spring resistance cannot be adjusted, the present application provides a thermal expansion valve.

[0006] The present application provides a thermal expansion valve that adopts the following technical solution:

[0007] A thermal expansion valve comprises a main body, a water outlet pipe is fixedly connected to the outer wall of the lower half of the main body, a water inlet pipe is fixedly connected to the upper half of the main body, a pressurizing box is fixedly connected to the top of the main body, a connecting end is fixedly connected to the top of the pressurizing box, a balancing pipe is fixedly connected to the side wall of the connecting end, a temperature sensing package is fixedly connected to the end of the balancing pipe away from the connecting end, and a resistance adjustment mechanism is arranged inside the main body;

[0008] The resistance adjustment mechanism is used to raise the vertical height of the lifting disc to adjust the compression of the spring, thereby achieving fine adjustment of the valve core resistance, thereby improving the control ability of the flow rate and making the adjustment more precise;

[0009] The resistance adjustment mechanism includes a screw rod rotatably arranged on the side wall of the main body, a knob is fixedly arranged on the end of the screw rod away from the main body, a locking plate is arranged on the side of the knob away from the screw rod, a turntable is arranged on the side of the locking plate away from the knob, a sliding block is penetrated through the outer wall of the screw rod, a roller is arranged on the top of the sliding block, a lifting disc is arranged on the top of the screw rod, a trigger block is fixedly arranged on the bottom of the lifting disc, a spring is fixedly arranged on the top of the lifting disc, a resistance plate is fixedly arranged on the top of the spring, a valve core is arranged on the top of the resistance plate, and a driving rod is movably arranged on the top of the valve core.

[0010] By adopting the above technical solution, the diameter of the knob is smaller than the diameter of the locking plate, so that the locking plate can fix the knob and improve stability. Vertical blocks are provided on the side walls of the turntable to facilitate the staff to grasp the turntable. The connecting end is connected to the pressurized box and the inside of the main body, which facilitates the layout of the structure.

[0011] Preferably, the resistance adjustment mechanism also includes a connecting ring fixedly connected to the outer wall of the main body, the end of the connecting ring away from the main body is fixedly connected to a locking ring, the side wall of the locking ring is penetrated by a driving port, the inner wall of the locking ring is threadedly connected to the outer wall of the turntable, the outer wall of the locking plate is slidably connected to the inner wall of the turntable, the screw rod movably penetrates the side wall of the connecting ring, the screw rod movably penetrates the side wall of the main body, the end of the screw rod away from the knob is movably penetrated by an auxiliary block fixedly connected to the bottom of the inner wall of the main body, the end of the screw rod close to the knob is fixedly connected to the side wall of the knob, and the side wall of the sliding block is threadedly penetrated by the outer wall of the screw rod.

[0012] By adopting the above technical solution, the diameter of the knob is smaller than the inner diameter of the locking ring, which facilitates the rotation of the knob inside the locking ring. The side wall of the knob is provided with friction patterns to increase the friction between the outer wall of the knob and the fingers. The hole position of the side wall of the connecting ring is consistent with the size of the hole position of the side wall of the main body, so that the rotation of the screw rod is more stable.

[0013] Preferably, the side wall of the sliding block is fixedly connected to a limiting block, the side wall of the limiting block movably penetrates a limiting plate fixedly connected to the bottom of the inner wall of the main body, and the top of the sliding block is fixedly connected to a support piece.

[0014] By adopting the above technical solution, the limiting plate and the limiting block are symmetrically arranged, so that the limiting is more stable and the stability of the movement of the sliding block is improved.

[0015] Preferably, a connecting strip connected to the top of the sliding block is fixedly connected to one vertical side of the support member, a round shaft is movably penetrated through the side wall of the connecting strip, and the side wall of the round shaft is fixedly penetrated through the side wall of the drum.

[0016] By adopting the above technical solution, the support member is tilted to support the side wall of the connecting strip.

[0017] Preferably, an arc plate is fixedly connected to the bottom of the inner wall of the main body, a side of the arc plate close to the sliding block is fixedly connected to a limiting vertical plate fixedly connected to the bottom of the inner wall of the main body, and an outer wall of the arc plate is fitted with a lifting cylinder fitted to the side wall of the limiting vertical plate.

[0018] By adopting the above technical solution, the outer wall of the arc plate fits with the inner wall of the lifting tube, a square hole is opened on the side wall of the lifting tube, and the limiting vertical plate passes through the square hole, thereby limiting the lifting tube and preventing the lifting tube from rotating horizontally.

[0019] Preferably, the top of the lifting cylinder is fixedly connected to the bottom of the lifting disc, the bottom of the lifting disc is fixedly connected to the top of the trigger block, the bottom of the trigger block is fixedly connected to a limit strip, and the outer wall of the lifting disc is slidably connected to a water-blocking ring fixedly connected to the inner wall of the main body.

[0020] By adopting the above technical solution, the side of the trigger block close to the connecting strip is set as an inclined surface, so that the roller can drive the trigger block to move vertically.

[0021] Preferably, the top of the water-blocking ring is fixedly connected to a limiting piece, the top of the lifting disc is fixedly connected to a telescopic rod, the top of the telescopic rod is fixedly connected to the bottom of the resistance plate, the side wall of the resistance plate is clamped with the limiting piece, the top of the lifting disc is fixedly connected to the bottom of the spring, and the top of the spring is fixedly connected to the bottom of the resistance plate.

[0022] By adopting the above technical solution, the limiting parts are symmetrically arranged, so that the resistance plate can only move vertically, and the diameter of the lifting disc is consistent with that of the resistance plate, so that the limiting parts can limit the lifting disc when the lifting disc moves vertically.

[0023] Preferably, the outer wall of the valve core is clamped with a valve seat fixedly connected to the inner wall of the main body, and the top of the driving rod is fixedly connected with a diaphragm fixedly connected to the inner wall of the pressurizing box.

[0024] By adopting the above technical solution, the valve core is set to be a truncated cone shape, and the hole position opened in the valve seat is adapted to the shape of the valve core, thereby making the sealing performance more excellent.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The knob is used to drive the screw rod to rotate, thereby driving the sliding block to move horizontally. As the sliding block moves horizontally, the roller on the top of the sliding block will fit with the inclined surface of the trigger block. As the sliding block continues to move, the roller drives the trigger block to move vertically upward, thereby causing the lifting disc to move vertically upward, thereby gradually reducing the expansion and contraction amount of the spring, thereby increasing the upward thrust of the spring on the resistance plate, thereby increasing the resistance generated by the resistance plate when the valve core moves vertically downward, thereby making the vertical movement speed of the valve core slower during the process of increasing the downward thrust of the driving rod, thereby making the size of the opening and closing of the valve inside the main body more accurately controlled, and facilitating the precise regulation of the refrigerant flow;

[0027] 2. By rotating the turntable, the turntable moves horizontally toward the side close to the knob, so that the turntable fixes the knob through the locking piece, thereby fixing the knob and preventing the structure from loosening due to the flow of liquid inside the main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a diagram showing the overall structure of the thermal expansion valve of this application;

[0029] Figure 2 Thermal Expansion Valve for this Application Figure 1 A partial enlarged view of the middle A;

[0030] Figure 3 This is a partial cross-sectional view of the knob of the thermal expansion valve of this application;

[0031] Figure 4 This is an overall display diagram of the internal structure of the thermal expansion valve of this application;

[0032] Figure 5 This is a partial display diagram of the thermal expansion valve support of this application;

[0033] Figure 6 This is a diagram showing the internal structure of the lifting cylinder of the thermal expansion valve of this application;

[0034] Figure 7 This is a partial cross-sectional view of the telescopic rod of the thermal expansion valve of this application.

[0035] Reference numerals:

[0036] 1. Main body; 11. Water outlet pipe; 12. Water inlet pipe; 13. Pressurizing box; 14. Connecting end; 15. Balance pipe; 16. Temperature sensing package;

[0037] 2. Resistance adjustment mechanism; 21. Connecting ring; 22. Locking ring; 23. Driving port; 24. Turntable; 25. Locking piece; 26. Screw rod; 27. Knob; 28. Sliding block; 29. ​​Limiting block; 210. Limiting plate; 211. Support member; 212. Connecting strip; 213. Round shaft; 214. Roller;

[0038] 215, curved plate; 216, limit vertical plate; 217, lifting cylinder; 218, lifting disc; 219, trigger block; 220, limit strip; 221, water blocking ring; 222, limit piece; 223, telescopic rod; 224, resistance plate; 225, valve core; 226, driving rod; 227, valve seat; 228, diaphragm; 229, spring; 230, auxiliary block. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-Figure 7 This application is described in further detail.

[0040] The embodiment of the present application discloses a thermal expansion valve.

[0041] Reference Figure 1 A thermal expansion valve includes a main body 1, a water outlet pipe 11 is fixedly connected to the outer wall of the lower half of the main body 1, a water inlet pipe 12 is fixedly connected to the upper half of the main body 1, a pressurizing box 13 is fixedly connected to the top of the main body 1, the pressurizing box 13 is communicated with the inside of a connecting end 14, the connecting end 14 is fixedly connected to the top of the pressurizing box 13, a balancing pipe 15 is fixedly connected to the side wall of the connecting end 14, a temperature sensing bag 16 is fixedly connected to the end of the balancing pipe 15 away from the connecting end 14, and a resistance adjusting mechanism 2 is arranged inside the main body 1, the resistance adjusting mechanism 2 is used to lift the vertical height of the lifting disc 218 so as to adjust the compression amount of the spring 229, so as to realize the fine adjustment of the resistance of the valve core 225, thereby improving the control ability of the flow rate and making the adjustment more precise.

[0042] The staff fixes the temperature sensing package 16 to the outer wall of the water outlet pipe 11 by means of binding tape or claw clamps, so that the temperature sensing package 16 can timely sense the temperature change of the liquid inside the water outlet pipe 11, and then connects the water outlet pipe 11 and the water inlet pipe 12 to the pipeline system.

[0043] Reference Figure 2 , Figure 3The resistance adjustment mechanism 2 includes a screw rod 26 rotatably arranged on the side wall of the main body 1, a knob 27 fixedly arranged at the end of the screw rod 26 away from the main body 1, a locking piece 25 arranged on the side of the knob 27 away from the screw rod 26, a rotating disk 24 arranged on the side of the locking piece 25 away from the knob 27, a sliding block 28 penetratingly arranged on the outer wall of the screw rod 26, a roller 214 arranged on the top of the sliding block 28, a lifting disc 218 arranged on the top of the screw rod 26, a trigger block 219 fixedly arranged at the bottom of the lifting disc 218, a spring 229 fixedly arranged on the top of the lifting disc 218, and a resistance plate 22 The valve core 225 is fixedly arranged on the top of the spring 229, the valve core 225 is arranged on the top of the resistance plate 224, the driving rod 226 is movably arranged on the top of the valve core 225, the resistance adjustment mechanism 2 also includes a connecting ring 21 fixedly connected to the outer wall of the main body 1, the locking ring 22 is fixedly connected to the end of the connecting ring 21 away from the main body 1, the outer wall of the locking ring 22 is consistent with the outer wall of the connecting ring 21, the driving port 23 is penetrated and opened in the side wall of the locking ring 22, the inner wall of the locking ring 22 is provided with a thread one, and the outer wall of the rotating disk 24 is threadedly connected with the thread one, so that the locking ring 22 is threadedly connected with the rotating disk 24.

[0044] When the opening and closing resistance of the valve core 225 needs to be increased, the staff rotates the knob 27, the knob 27 will drive the screw rod 26 to rotate, and the screw rod 26 will drive the sliding block 28 to move horizontally.

[0045] Reference Figure 4 The diameter of the locking piece 25 is matched with the inner diameter of the locking ring 22, so that the locking piece 25 is slidably connected to the rotating disk 24. A circular hole 1 is formed through the side wall of the connecting ring 21, and a circular hole 2 is formed through the side wall of the main body 1. The diameters of the circular holes 1 and 2 are consistent. The screw rod 26 movably passes through the circular holes 1 and 2, so that the screw rod 26 is rotatably connected to the connecting ring 21 and the main body 1. A circular hole 3 is formed through the side wall of the auxiliary block 230, and the screw rod 26 movably passes through the circular hole 3, so that the screw rod 26 is rotatably connected to the connecting ring 21 and the main body 1. It is rotatably connected with the auxiliary block 230, the bottom of the auxiliary block 230 is fixedly connected to the bottom of the inner wall of the main body 1, the side wall of the knob 27 is fixedly connected to the end of the screw rod 26 close to the knob 27, and the side wall of the knob 27 corresponds to the driving port 23, so that the staff can contact the outer wall of the knob 27 through the driving port 23 to rotate the knob 27, and the side wall of the sliding block 28 is penetrated by an internal threaded hole, and the outer wall of the screw rod 26 and the internal threaded hole are threadedly penetrated, so that the sliding block 28 is threadedly connected to the screw rod 26.

[0046] The sliding block 28 will drive the top connecting strip 212 to move horizontally toward the trigger block 219 , and the roller 214 on the top of the connecting strip 212 will fit with the inclined surface of the trigger block 219 , and then continue to move horizontally with the sliding block 28 .

[0047] Reference Figure 4 , Figure 5The limit block 29 is fixedly connected to the side wall of the sliding block 28, and the limit block 29 is symmetrically arranged on both sides of the sliding block 28. The side wall of the limit plate 210 is penetrated with a horizontal sliding groove, and the side wall of the limit block 29 is movable through the sliding groove, so that the limit block 29 is slidably connected to the limit plate 210, and the bottom of the limit plate 210 is fixedly connected to the bottom of the inner wall of the main body 1, so that the limit plate 210 is fixedly connected to the main body 1, and the support member 211 is fixedly connected to the top of the sliding block 28, and the vertical side of the support member 211 is fixedly connected to the side wall of the connecting strip 212, and the bottom of the connecting strip 212 is fixedly connected to the sliding block 28. The top of the block 28 is connected, and the connecting strip 212 is higher than the highest point of the support 211, so as to avoid interference with the rotation of the roller 214. The circular shaft 213 movably passes through the side wall of the connecting strip 212. A circular hole four is opened through the side wall of the roller 214. The side wall of the circular shaft 213 and the circular hole four are fixedly penetrated, so that the roller 214 and the circular shaft 213 can realize synchronous rotation. The arc plate 215 is fixedly connected to the bottom of the inner wall of the main body 1. The arc plate 215 is symmetrically arranged with the screw rod 26 as the axis. The side of the arc plate 215 close to the sliding block 28 is fixedly connected to the limiting vertical plate 216.

[0048] The roller 214 will rotate on the inclined surface of the trigger block 219, and the trigger block 219 will be driven by the roller 214 to move vertically, so that the trigger block 219 drives the lifting disc 218 to move vertically synchronously.

[0049] Reference Figure 6 The bottom of the limiting vertical plate 216 is fixedly connected to the bottom of the inner wall of the main body 1, the outer wall of the arc plate 215 is fitted with the inner wall of the lifting cylinder 217, and the opening of the lifting cylinder 217 is fitted with the side wall of the limiting vertical plate 216, so that the lifting cylinder 217 can only move vertically, the bottom of the lifting disk 218 is fixedly connected to the top of the lifting cylinder 217, and the diameter of the lifting disk 218 is consistent with the diameter of the lifting cylinder 217, so as to realize the synchronous vertical movement of the lifting disk 218 and the lifting cylinder 217, and the top of the trigger block 219 is fixedly connected to the bottom of the lifting disk 218. It is fixedly connected to the top of the limit strip 220, so that when the roller 214 moves to the bottom of the trigger block 219, the limit strip 220 will limit the roller 214 to prevent the roller 214 from being separated from the trigger block 219, and the outer wall of the lifting disk 218 fits with the inner wall of the water-blocking ring 221, so that the lifting disk 218 and the water-blocking ring 221 are slidingly connected, and the outer wall of the water-blocking ring 221 is fixedly connected to the inner wall of the main body 1, so that when the lifting cylinder 217 drives the lifting disk 218 to move vertically, the lifting cylinder 217 will fit the inside of the water-blocking ring 221.

[0050] At this time, the lifting disc 218 will raise the bottom position of the spring 229, thereby shortening the distance between the lifting disc 218 and the resistance plate 224. As a result, when the valve core 225 drives the resistance plate 224 to move vertically downward, the compression amount of the spring 229 is changed, so that the spring 229 has a greater resistance to the resistance plate 224, so that the vertical movement speed of the valve core 225 is slower under the same downward pressure, thereby making the opening and closing control of the valve more precise.

[0051] Reference Figure 7 The top of the water blocking ring 221 is fixedly connected to the bottom of the limiter 222, the top of the lifting disc 218 is fixedly connected to the fixed end of the telescopic rod 223, and the telescopic end of the telescopic rod 223 is fixedly connected to the bottom of the resistance plate 224, so that the resistance plate 224 is constrained by the telescopic rod 223. The side wall of the resistance plate 224 is clamped with the limiter 222, so as to further improve the stability of the vertical movement of the resistance plate 224, the top of the lifting disc 218 is fixedly connected to the bottom of the spring 229, and the bottom of the resistance plate 224 is fixedly connected to the top of the spring 229, so as to provide reverse vertical resistance to the valve core 225 through the spring 229, the outer wall of the valve core 225 is clamped with the inner wall of the valve seat 227, and the outer wall of the valve seat 227 is fixedly connected to the inner wall of the main body 1, the top of the driving rod 226 is fixedly connected to the bottom of the diaphragm 228, and the outer wall of the diaphragm 228 is fixedly connected to the inner wall of the pressurizing box 13.

[0052] When the adjustment is completed, the staff pinches the turntable 24 to rotate the turntable 24, and the turntable 24 is driven by the thread to move horizontally toward the side of the knob 27, and the turntable 24 drives the locking piece 25 to move horizontally toward the side of the knob 27, thereby fixing the knob 27, thereby completing the locking of the knob 27.

[0053] Among them, the balance tube 15, the temperature sensing package 16, the telescopic rod 223, the valve core 225, the valve seat 227, and the diaphragm 228 are all existing technologies, and their structural principles will not be repeated. They also include straps, external water pipes, etc., which are not the main technologies and will not be repeated.

[0054] The implementation principle of a thermal expansion valve in the embodiment of the present application is:

[0055] When it is necessary to increase the opening and closing resistance of the valve core 225, the staff turns the knob 27, and the knob 27 will drive the screw rod 26 to rotate, and the screw rod 26 will drive the roller 214 at the top of the connecting strip 212 to fit the inclined surface of the trigger block 219. Then, as the sliding block 28 continues to move horizontally, the roller 214 will rotate on the inclined surface of the trigger block 219, and at the same time, the trigger block 219 will be driven by the roller 214 to move vertically, so that the trigger block 219 drives the lifting disk 218 to move vertically synchronously. At this time, the lifting disk 218 will raise the bottom position of the spring 229, thereby changing the compression amount of the spring 229, so that the spring 229 has a greater resistance to the resistance plate 224, thereby more accurately controlling the opening and closing of the valve. When the adjustment is completed, the staff pinches the turntable 24 and rotates the turntable 24. The turntable 24 is driven by the thread to move horizontally toward the side of the knob 27, and the turntable 24 will drive the locking plate 25 to move horizontally toward the side of the knob 27, thereby fixing the knob 27.

[0056] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A thermal expansion valve, comprising a main body (1), a water outlet pipe (11) being fixedly connected to the outer wall of the lower half of the main body (1), a water inlet pipe (12) being fixedly connected to the upper half of the main body (1), a pressurizing box (13) being fixedly connected to the top of the main body (1), a connecting end (14) being fixedly connected to the top of the pressurizing box (13), a balancing pipe (15) being fixedly connected to the side wall of the connecting end (14), and a temperature sensing package (16) being fixedly connected to the end of the balancing pipe (15) away from the connecting end (14), characterized in that: A resistance adjustment mechanism (2) is provided inside the main body (1); The resistance adjustment mechanism (2) is used to raise the vertical height of the lifting disc (218) so as to adjust the compression amount of the spring (229), thereby achieving fine adjustment of the resistance of the valve core (225), thereby improving the control ability of the flow rate and making the adjustment more precise; The resistance adjustment mechanism (2) comprises a screw rod (26) rotatably arranged on a side wall of a main body (1); a knob (27) is fixedly arranged at one end of the screw rod (26) away from the main body (1); a locking plate (25) is arranged on the side of the knob (27) away from the screw rod (26); a rotating disk (24) is arranged on the side of the locking plate (25) away from the knob (27); a sliding block (28) is arranged through the outer wall of the screw rod (26); a roller (214) is arranged on the top of the sliding block (28); a lifting disk (218) is arranged on the top of the screw rod (26); a trigger block (219) is fixedly arranged on the bottom of the lifting disk (218); a spring (229) is fixedly arranged on the top of the lifting disk (218); a resistance plate (224) is fixedly arranged on the top of the spring (229); a valve core (225) is arranged on the top of the resistance plate (224); and a driving rod (226) is movably arranged on the top of the valve core (225).

2. A thermal expansion valve according to claim 1, characterized in that: The resistance adjustment mechanism (2) further comprises a connecting ring (21) fixedly connected to the outer wall of the main body (1); an end of the connecting ring (21) away from the main body (1) is fixedly connected to a locking ring (22); a driving opening (23) is formed through a side wall of the locking ring (22); an inner wall of the locking ring (22) is threadedly connected to an outer wall of a rotating disk (24); an outer wall of the locking plate (25) is slidably connected to an inner wall of the rotating disk (24); the screw rod (26) movably penetrates the side wall of the connecting ring (21); the screw rod (26) movably penetrates the side wall of the main body (1); an end of the screw rod (26) away from the knob (27) movably penetrates an auxiliary block (230) fixedly connected to the bottom of the inner wall of the main body (1); an end of the screw rod (26) close to the knob (27) is fixedly connected to the side wall of the knob (27); and a side wall of the sliding block (28) is threadedly penetrated by an outer wall of the screw rod (26).

3. A thermal expansion valve according to claim 2, characterized in that: The side wall of the sliding block (28) is fixedly connected to the limit block (29), the side wall of the limit block (29) is movably penetrated by a limit plate (210) fixedly connected to the bottom of the inner wall of the main body (1), and the top of the sliding block (28) is fixedly connected to a support member (211).

4. A thermal expansion valve according to claim 3, characterized in that: A connecting strip (212) connected to the top of the sliding block (28) is fixedly connected to one vertical side of the support member (211), a round shaft (213) movably penetrates the side wall of the connecting strip (212), and the side wall of the round shaft (213) is fixedly penetrated by the side wall of the roller (214).

5. A thermal expansion valve according to claim 4, characterized in that: The bottom of the inner wall of the main body (1) is fixedly connected to an arc-shaped plate (215); a side of the arc-shaped plate (215) close to the sliding block (28) is fixedly connected to a limiting vertical plate (216) fixedly connected to the bottom of the inner wall of the main body (1); and the outer wall of the arc-shaped plate (215) is fitted with a lifting cylinder (217) fitted with the side wall of the limiting vertical plate (216).

6. A thermal expansion valve according to claim 5, characterized in that: The top of the lifting cylinder (217) is fixedly connected to the bottom of the lifting disc (218), the bottom of the lifting disc (218) is fixedly connected to the top of the trigger block (219), the bottom of the trigger block (219) is fixedly connected to the limit strip (220), and the outer wall of the lifting disc (218) is slidably connected to a water-blocking ring (221) fixedly connected to the inner wall of the main body (1).

7. A thermal expansion valve according to claim 6, characterized in that: The top of the water-blocking ring (221) is fixedly connected to a limiting member (222); the top of the lifting disc (218) is fixedly connected to a telescopic rod (223); the top of the telescopic rod (223) is fixedly connected to the bottom of a resistance plate (224); the side wall of the resistance plate (224) is clamped with the limiting member (222); the top of the lifting disc (218) is fixedly connected to the bottom of a spring (229); and the top of the spring (229) is fixedly connected to the bottom of the resistance plate (224).

8. A thermal expansion valve according to claim 1, characterized in that: The outer wall of the valve core (225) is clamped with a valve seat (227) fixedly connected to the inner wall of the main body (1), and the top of the driving rod (226) is fixedly connected to a diaphragm (228) fixedly connected to the inner wall of the pressurizing box (13).

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