A modulating automotive expansion valve and method

Abstract

This invention discloses an adjustable automotive expansion valve and method, belonging to the field of expansion valve technology. It includes a valve body, a rotary progressive valve opening assembly connected to the middle of the valve body, a self-locking valve body switch drive assembly connected to the upper end of the valve body, and a self-limiting manual adjustment assembly connected to the lower end of the valve body. The self-locking valve body switch drive assembly senses the temperature at the upper end of the valve body and drives the rotary progressive valve opening assembly to move. The rotary progressive valve opening assembly gradually controls the flow rate of the condensate at the lower end of the valve body, thereby achieving temperature regulation at the upper end of the valve body. When either the self-locking valve body switch drive assembly or the rotary progressive valve opening assembly malfunctions, the self-limiting manual adjustment assembly manually adjusts the condensate flow rate. The self-locking valve body switch drive assembly facilitates disassembly, replacement, and repair.

Description

Technical Field

[0001] This invention relates to the field of expansion valve technology, and specifically to a regulating automotive expansion valve and method. Background Technology

[0002] The expansion valve is an important component in the automotive air conditioning system. It controls the valve flow by controlling the temperature change at the end of the evaporator, thereby preventing insufficient utilization of the evaporator area and knocking.

[0003] Chinese patent CN212457528U discloses an automotive expansion valve, comprising a valve body closed at the bottom and open at the top, a valve body diaphragm, a capillary tube, and a temperature sensing bulb. Inside the valve body, at the upper end, there is a guide block with a guide hole. A valve seat is provided on the lower side of the guide block with a flow guide port. A refrigerant outlet is provided on the side wall of the valve body between the guide block and the valve seat. A refrigerant inlet is provided on the side wall of the valve body below the valve seat. A push rod is connected to the diaphragm, with its lower end passing through the guide hole and the flow guide port in sequence. The lower end of the push rod is connected to a spherical valve core that can close the flow guide port.

[0004] However, when the above-mentioned patent is in operation, because the valve sealing port uses a ball valve, the ball valve has poor gradual adjustment function. Once the ball valve is opened, it will fully open the valve port, making it impossible to achieve precise casting adjustment. This may result in overheating or overcooling, which in turn leads to frequent adjustment of the expansion valve and easy damage to the expansion valve.

[0005] Based on this, the present invention designs an adjustable automotive expansion valve and method to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides an adjustable automotive expansion valve and method.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An adjustable automotive expansion valve, comprising a valve body;

[0009] A rotary progressive valve opening assembly for gradually adjusting the condensate flow rate is connected to the middle of the valve body;

[0010] The upper end of the valve body is connected to a self-locking valve body switch drive assembly for adaptive drive of the rotary progressive valve opening assembly and easy disassembly. The top of the rotary progressive valve opening assembly is rotatably connected to the bottom of the self-locking valve body switch drive assembly.

[0011] The lower end of the valve body is connected to a self-limiting manual adjustment assembly for manually adjusting and switching states to limit the rotary progressive opening valve assembly.

[0012] The rotary progressive valve opening assembly includes a linkage rotary assembly and a progressive valve opening assembly. The linkage rotary assembly is connected to the middle of the upper end of the valve body. The progressive valve opening assembly is fixedly connected to the bottom of the linkage rotary assembly. The self-limiting manual adjustment assembly is fixedly connected to the lower end of the progressive valve opening assembly. The self-locking valve body switch drive assembly is rotatably connected to the top of the linkage rotary assembly.

[0013] Furthermore, a vent hole is provided at the upper end of the valve body, and a condensate inlet and a condensate outlet are provided on both sides of the lower end of the valve body, respectively.

[0014] Furthermore, the linkage rotary assembly includes a limiting groove, a threaded groove, a rotating push plate, a limiting protrusion, a square sliding column, and a rotating cylinder. A limiting groove is provided in the middle of the valve body. The limiting groove tapers in a stepped shape from top to bottom. A threaded groove is provided on the inner wall of the upper end of the limiting groove. A rotating push plate is slidably connected to the upper end of the limiting groove. A limiting protrusion is fixedly connected to the outer end of the rotating push plate. The end of the limiting protrusion near the rotating push plate is slidably connected to the inside of the rotating push plate. A square sliding column is fixedly connected to the bottom of the rotating push plate. The rotating cylinder is rotatably connected to the middle of the limiting groove. A square slot is provided in the middle of the rotating cylinder. The lower end of the square sliding column is slidably connected to the inside of the square slot. The lower end of the limiting groove is connected to the condensate outlet at the lower end of the valve body.

[0015] Furthermore, the progressive valve opening assembly includes a linkage rod, a valve opening slot, a limiting baffle, a rotating plate, and a liquid storage tank. The linkage rod is fixedly connected to the bottom of the rotating cylinder. A valve opening slot is provided on the valve body below the limiting slot, and a liquid storage tank is provided on the valve body below the valve opening slot. The limiting slot, the valve opening slot, and the liquid storage tank are connected. Two sets of horizontally placed limiting baffles with overlapping vertical positions are fixedly connected inside the progressive valve opening assembly. Both sets of limiting baffles are semicircular. A rotating plate is slidably connected to the middle of the two sets of limiting baffles. The rotating plate and the limiting baffles combine to form a complete circle. The linkage rod passes through the two sets of limiting baffles and the rotating plate. The linkage rod is rotatably connected to both sets of limiting baffles. The linkage rod is fixedly connected to the rotating plate. The linkage rod passes through the valve body below the liquid storage tank and is fixedly connected to a self-limiting manual adjustment assembly. The outer side of the upper end of the square sliding column is connected to the condensate inlet at the lower end of the valve body.

[0016] Furthermore, the self-locking valve body switch drive assembly includes an adaptive drive assembly and a press-type locking assembly. The upper end of the valve body is connected to the adaptive drive assembly, the bottom of the adaptive drive assembly is rotatably connected to the top of the rotating push plate, and the outer end of the adaptive drive assembly is connected to the press-type locking assembly, with the outer end of the press-type locking assembly connected to the upper end of the valve body.

[0017] Furthermore, the adaptive drive assembly includes a mounting groove, a support frame, a frustum-shaped protrusion cover, an elastic heat-sensing plate, and a linkage push rod. The upper end of the valve body has a mounting groove, the lower end of the support frame is snapped into the inside of the mounting groove, the top of the support frame is fixedly connected to the frustum-shaped protrusion cover, the lower end of the frustum-shaped protrusion cover is snapped into the elastic heat-sensing plate, and the bottom middle position of the elastic heat-sensing plate is fixedly connected to the linkage push rod. The lower end of the linkage push rod passes through the bottom plate of the support frame and is rotatably connected to the top of the rotating push plate. The closed space between the elastic heat-sensing plate and the frustum-shaped protrusion cover contains a temperature-sensing reagent. The support frame, the mounting groove, and the limiting groove are connected. When the elastic heat-sensing plate is deformed, the rotating plate and the limiting baffle combine to form a complete circle and completely seal the opening between the liquid storage tank and the limiting groove.

[0018] Furthermore, the press-type locking assembly includes an unlocking groove, a locking slider, a first spring, an unlocking slide post, a pressing ring, a limiting guide slide post, and a second spring. Several sets of unlocking grooves are provided on the side wall of the support frame. Grooves are provided on the valve body outside the unlocking grooves. Locking sliders are slidably connected inside the grooves. A first spring is fixedly connected between the locking slider and the inner wall of the groove away from the support frame. A set of unlocking slide posts is slidably connected inside the unlocking grooves. The lower end of the unlocking slide post is slidably connected to the locking slider. A pressing ring is fixedly connected to the top of the unlocking slide post. Several sets of limiting guide slide posts are fixedly connected to the bottom of the pressing ring. The limiting guide slide posts pass through the top plate of the valve body and are fixedly connected to a baffle. A second spring is fixedly connected between the baffle and the inner top of the valve body. The end of the locking slider near the support frame is an inclined surface.

[0019] Furthermore, the self-limiting manual adjustment assembly includes a ratchet, a rotating plate, a first rotating shaft, a torsion spring, a pawl, a second rotating shaft, a cam, a switching rod, and a limiting stop. The linkage rod passes through the valve body below the liquid storage tank and is fixedly connected to the ratchet. A cylindrical mounting cover is fixedly connected to the bottom of the valve body. The limiting groove passes through the ratchet and the bottom plate of the mounting cover and is fixedly connected to the rotating plate. The first rotating shaft is fixedly connected to the bottom of the valve body outside the ratchet. A torsion spring is fixedly connected to the outer end of the first rotating shaft. A pawl is fixedly connected to the outer end of the torsion spring. The end of the pawl near the ratchet engages with the ratchet. The second rotating shaft is rotatably connected to the bottom of the valve body on the side of the pawl near the ratchet. The second rotating shaft passes through the cam and the bottom plate of the mounting cover and is fixedly connected to the switching rod. Limit stops are fixedly connected to the bottom of the mounting covers on both sides of the switching rod.

[0020] To better achieve the objectives of this invention, the present invention also provides a method for using an adjustable automotive expansion valve, comprising the following steps:

[0021] Step 1: The temperature inside the vent at the top of the valve body is sensed by the temperature-sensing reagent inside the elastic heating plate and the frustum-shaped protrusion. When the temperature inside the vent is high, the temperature-sensing reagent expands and compresses the elastic heating plate, causing it to deform. The expansion of the elastic heating plate drives the linkage push rod downwards, which in turn drives the rotating push plate downwards. When the temperature inside the vent decreases, the temperature-sensing reagent contracts. Under the restoring force of the elastic heating plate, it drives the linkage push rod upwards, which in turn drives the frustum-shaped protrusion upwards. When it is necessary to replace the elastic heating plate or the temperature-sensing reagent, press down on the pressing ring. Pressing the ring causes the limiting guide slide and the unlocking slide to move downwards. The limiting guide slide moves downwards and pulls the second spring, causing it to deform. The unlocking slide moves downwards in the unlocking groove until it contacts the inclined surface of the locking slider and continues to move downwards. The unlocking slide presses against the locking slider, causing it to... The locking slider slides into the groove, compressing the first spring and causing it to deform. When the locking slider leaves the unlocking groove, the support frame is pulled out of the mounting groove. The support frame drives the frustum-shaped protrusion and the elastic heat-sensing plate to move upward. The elastic heat-sensing plate drives the rotating push plate to move upward through the linkage push rod. The support frame is then put back into the mounting groove. At this time, the rotating push plate is aligned with the limiting groove, and the unlocking groove is aligned with the locking slider. When the support frame is fully placed in the mounting groove, the pressing ring is released. Under the action of the second spring's restoring force, the second spring drives the pressing ring to move upward through the limiting guide slide. The pressing ring drives the unlocking slide to move upward. At this time, under the action of the first spring's restoring force, the first spring drives the locking slider to move closer to the support frame. When the end of the locking slider close to the support frame enters the unlocking groove, the locking of the support frame is completed.

[0022] Step Two: The temperature inside the vent at the upper end of the valve body is sensed by the self-locking valve body switch drive assembly. When the temperature at the upper end of the valve body is high, the self-locking valve body switch drive assembly drives the rotating push plate to move downward under the limit of the limiting groove. The rotating push plate drives the limiting protrusion to move downward. At the same time, the limiting protrusion moves downward and drives the rotating push plate to rotate under the limit of the threaded groove. The rotating push plate drives the square sliding column to move downward and rotate. Since the square sliding column and the middle sliding groove of the rotating cylinder are both square, the square sliding column slides downward inside the rotating cylinder and drives the rotating cylinder to rotate. The rotating cylinder drives the linkage rod to rotate. The linkage rod drives the rotating plate to rotate under the limit of the valve opening slot and the two sets of limiting baffles 223. This causes the opening between the storage tank and the limiting groove to gradually increase. The condensate inlet is connected to the condensate outlet through the storage tank and the limiting groove. When the opening between the storage tank and the limiting groove increases, the amount of condensate entering the condensate outlet increases. When the temperature in the vent hole above the valve body is low, the self-locking valve body switch drive assembly drives the rotating push plate to move upward. The rotating push plate drives the limiting protrusion to move upward under the limitation of the threaded groove while rotating. The limiting protrusion drives the linkage rod to rotate through the square sliding column and the rotating cylinder. The linkage rod drives the rotating plate to rotate. The rotating plate rotates and gradually seals the opening between the storage tank and the limiting groove. When the rotating plate rotates, it gradually opens and closes the opening between the storage tank and the limiting groove.

[0023] Step 3: When the self-locking valve body switch drive assembly malfunctions and cannot drive the rotary progressive valve opening assembly for adjustment, rotate the rotating plate. The rotating plate drives the ratchet to rotate via the linkage rod, which in turn drives the rotating plate to rotate, thereby adjusting the opening size between the liquid storage tank and the limiting tank, thus achieving manual adjustment. Rotate the switching rod so that the switching rod contacts a set of limiting stops away from the pawl. At this time, the pawl rotates towards the ratchet under the restoring force of the torsion spring, and the end of the pawl near the ratchet engages with the ratchet. At this time, the ratchet is locked by the pawl. When the self-locking valve body switch drive assembly is repaired, rotate the switching rod so that the switching rod contacts a set of limiting stops near the pawl. At this time, the second rotating shaft drives the cam to rotate until the cam contacts the pawl. Continue to rotate the second rotating shaft, and the cam squeezes the pawl, causing the pawl to rotate away from the ratchet, thus unlocking the ratchet. Beneficial effects

[0024] When the expansion valve is working, the self-locking valve body switch drive assembly senses the temperature inside the vent at the upper end of the valve body. When the temperature at the upper end of the valve body is high, the self-locking valve body switch drive assembly drives the rotating push plate to move downward under the limit of the limiting groove. The rotating push plate drives the limiting protrusion to move downward. At the same time, the limiting protrusion moves downward and drives the rotating push plate to rotate under the limit of the threaded groove. The rotating push plate drives the square sliding column to move downward and rotate. Since both the square sliding column and the sliding groove in the middle of the rotating cylinder are square, the square sliding column slides downward inside the rotating cylinder and drives the rotating cylinder to rotate. The rotating cylinder drives the linkage rod to rotate. The linkage rod drives the rotating plate to rotate under the limit of the valve opening slot and the two sets of limiting baffles 223, thereby gradually increasing the opening between the liquid storage tank and the limiting groove. Since the condensate inlet is connected to the condensate outlet through the liquid storage tank and the limiting groove, when the liquid storage tank and the limiting groove are connected... When the opening between the slots increases, the amount of condensate entering the condensate outlet increases, thus increasing the cooling effect. When the temperature inside the vent hole above the valve body is low, the self-locking valve body switch drive assembly drives the rotating push plate to move upward. The rotating push plate drives the limiting protrusion to move upward under the limit of the threaded groove while rotating. The limiting protrusion drives the linkage rod to rotate through the square sliding column and the rotating cylinder. The linkage rod drives the rotating plate to rotate. The rotating plate rotates and gradually seals the opening between the liquid storage tank and the limiting slot, thus reducing the condensate flow rate and decreasing the cooling effect. This, in turn, increases the temperature inside the vent hole at the top of the valve body. Because the rotating plate gradually opens and closes the opening between the liquid storage tank and the limiting slot when rotating, the condensate flow rate can be controlled more precisely, thus allowing for more precise control of the temperature inside the vent hole at the top of the valve body, preventing overheating or overcooling.

[0025] When the expansion valve is working, this invention senses the temperature inside the vent at the upper end of the valve body through an elastic heating plate and a temperature-sensing reagent within the frustum-shaped protrusion. When the temperature inside the vent is high, the temperature-sensing reagent expands and compresses the elastic heating plate, causing it to deform. This expansion drives a linkage push rod downwards, which in turn drives a rotating push plate downwards. When the temperature inside the vent decreases, the temperature-sensing reagent contracts. Under the restoring force of the elastic heating plate, it drives the linkage push rod upwards, which in turn drives the frustum-shaped protrusion upwards. This achieves adaptive adjustment of the working state of the rotary progressive valve opening assembly, thus regulating the temperature of the vent at the upper end of the valve body. When it is necessary to replace the elastic heating plate or the temperature-sensing reagent, press down on the pressing ring. The ring drives the limiting guide slide and the unlocking slide downwards. The limiting guide slide moves downwards and pulls the second spring, causing it to deform. The unlocking slide moves downwards within the unlocking groove until it contacts the inclined surface of the locking slider, then continues downwards. The unlocking slide presses against the locking slider, causing it to slide into the groove. At this time, the locking slider presses against the first spring, causing it to deform. When the locking slider leaves the unlocking groove, it pulls the support frame out of the mounting slot. The support frame drives the frustum-shaped protrusion and the elastic heat-sensing plate upwards. The elastic heat-sensing plate, through a linkage push rod, drives the rotating push plate upwards, thus allowing the elastic heat-sensing plate, linkage push rod, and rotating push plate to be disassembled. This allows the elastic heat-sensing plate and the temperature-sensing reagent to be replaced or filled, thereby making the square... The elastic heating plate is easy to disassemble for repair. After repair, the support frame is repositioned into the mounting slot. Align the rotating push plate with the limiting slot and the unlocking slide with the locking slider. When the support frame is fully inserted into the mounting slot, release the pressing ring. Under the restoring force of the second spring, the second spring drives the pressing ring upwards via the limiting guide slide. The pressing ring then drives the unlocking slide upwards. At this point, under the restoring force of the first spring, the first spring drives the locking slider towards the support frame. When the end of the locking slider near the support frame enters the unlocking slide, the support frame is locked. This makes installation and locking simple and convenient. Additionally, if the self-locking valve body switch drive assembly malfunctions and cannot drive the rotary valve... When adjusting the progressive valve opening assembly, rotating the vane causes the ratchet to rotate via a linkage rod, which in turn rotates the rotating plate. This adjusts the opening size between the reservoir and the limiting groove, allowing for manual adjustment. Rotating the switching rod brings it into contact with a set of limiting stops away from the pawl. At this point, the pawl, under the restoring force of the torsion spring, rotates towards the ratchet, locking the ratchet and preventing the rotating plate from rotating during operation. This prevents incorrect adjustment of the rotary progressive valve opening assembly due to a malfunction in the self-locking valve body switch drive assembly, which could lead to overcooling or overheating. Once the self-locking valve body switch drive assembly is repaired...Rotating the switching lever causes it to contact a set of limit stops near the pawl. At this point, the second shaft drives the cam to rotate until it contacts the pawl. Continuing to rotate the second shaft causes the cam to press against the pawl, rotating it away from the ratchet. This unlocks the ratchet, allowing the expansion valve to function normally. This enables emergency manual adjustment or closure of the condensate passage in case of expansion valve failure. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This invention provides a three-dimensional structure for an adjustable automotive expansion valve. Figure 1 ;

[0028] Figure 2 This is a front view of the structure of an adjustable automotive expansion valve according to the present invention;

[0029] Figure 3 This is a top view of an adjustable automotive expansion valve structure according to the present invention;

[0030] Figure 4 This invention provides a three-dimensional structure for an adjustable automotive expansion valve. Figure 2 ;

[0031] Figure 5 For along Figure 3 BB direction sectional view;

[0032] Figure 6 For along Figure 3 A cross-sectional view along the CC direction;

[0033] Figure 7 For along Figure 2 A sectional view along the AA direction;

[0034] Figure 8 for Figure 5 Enlarged view at point D;

[0035] Figure 9 for Figure 6 Enlarged view of point E in the middle.

[0036] The labels in the diagram represent: 1. Valve body; 2. Rotary progressive valve opening assembly; 21. Linked rotary assembly; 211. Limiting groove; 212. Threaded groove; 213. Rotary push plate; 214. Limiting protrusion; 215. Square sliding column; 216. Rotary cylinder; 22. Progressive valve opening assembly; 221. Linked rotating rod; 222. Valve opening slot; 223. Limiting baffle; 224. Rotating plate; 225. Liquid reservoir; 3. Self-locking valve body switch drive assembly; 31. Adaptive drive assembly; 311. Mounting groove; 312. Support frame. Frame 313. Frustum-shaped protruding cover 314. Elastic heating plate 315. Linkage push rod 32. Press-type locking assembly 321. Unlocking slide 322. Locking slider 323. First spring 324. Unlocking slide post 325. Pressing ring 326. Limiting guide slide post 327. Second spring 4. Self-limiting manual adjustment assembly 41. Ratchet 42. Rotating plate 43. First rotating shaft 44. Torsion spring 45. Pawl 46. Second rotating shaft 47. Cam 48. Switching rod 49. Limiting stop post. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] The present invention will be further described below with reference to embodiments.

[0039] In some embodiments, please refer to the appendix to the instruction manual. Figure 1-9 A type of adjustable automotive expansion valve, comprising a valve body 1,

[0040] A rotary progressive valve opening assembly 2 for progressively adjusting the flow rate of condensate is connected to the middle of the valve body 1;

[0041] The upper end of the valve body 1 is connected to a self-locking valve body switch drive assembly 3 for adaptive driving of the rotary progressive valve opening assembly 2 and easy disassembly. The top of the rotary progressive valve opening assembly 2 is rotatably connected to the bottom of the self-locking valve body switch drive assembly 3.

[0042] The lower end of the valve body 1 is connected to a self-limiting manual adjustment component 4, which limits the rotary progressive opening valve assembly 2 for manual adjustment and can switch states.

[0043] The rotary progressive valve opening assembly 2 includes a linkage rotary assembly 21 and a progressive valve opening assembly 22. The linkage rotary assembly 21 is connected to the middle of the upper end of the valve body 1. The progressive valve opening assembly 22 is fixedly connected to the bottom of the linkage rotary assembly 21. The self-limiting manual adjustment assembly 4 is fixedly connected to the lower end of the progressive valve opening assembly 22. The self-locking valve body switch drive assembly 3 is rotatably connected to the top of the linkage rotary assembly 21.

[0044] A vent hole is provided at the upper end of the valve body 1, and a condensate inlet and a condensate outlet are provided on both sides of the lower end of the valve body 1, respectively.

[0045] The linkage rotary assembly 21 includes a limiting groove 211, a threaded groove 212, a rotary pusher 213, a limiting protrusion 214, a square sliding column 215, and a rotating cylinder 216. The limiting groove 211 is provided in the middle of the valve body 1. The limiting groove 211 tapers in a stepped shape from top to bottom. The threaded groove 212 is provided on the inner wall of the upper end of the limiting groove 211. The rotary pusher 213 is slidably connected to the inner wall of the upper end of the limiting groove 211, and the outer end of the rotary pusher 213 is fixedly connected to... There is a limiting protrusion 214, one end of which is slidably connected to the inside of the rotating push plate 213. A square sliding column 215 is fixedly connected to the bottom of the rotating push plate 213. A rotating cylinder 216 is rotatably connected to the middle of the limiting groove 211. A square slot is opened in the middle of the rotating cylinder 216. The lower end of the square sliding column 215 is slidably connected to the inside of the square slot. The lower end of the limiting groove 211 is connected to the condensate outlet at the lower end of the valve body 1.

[0046] The progressive valve opening assembly 22 includes a linkage rod 221, a valve opening slot 222, a limiting baffle 223, a rotating plate 224, and a liquid storage tank 225. The linkage rod 221 is fixedly connected to the bottom of the rotating cylinder 216. The valve body 1 below the limiting slot 211 has a valve opening slot 222, and the valve body 1 below the valve opening slot 222 has a liquid storage tank 225. The limiting slot 211, the valve opening slot 222, and the liquid storage tank 225 are connected. Two sets of horizontally placed limiting baffles 223 with overlapping vertical positions are fixedly connected inside the progressive valve opening assembly 22. 223 are all semicircles. A rotating plate 224 is slidably connected to the middle of the two sets of limiting baffles 223. The rotating plate 224 and the limiting baffles 223 are combined to form a complete circle. The linkage rotating rod 221 passes through the two sets of limiting baffles 223 and the rotating plate 224. The linkage rotating rod 221 is rotatably connected to both sets of limiting baffles 223. The linkage rotating rod 221 is fixedly connected to the rotating plate 224. The linkage rotating rod 221 passes through the valve body 1 below the liquid storage tank 225 and is fixedly connected to the self-limiting manual adjustment component 4. The outer side of the upper end of the square sliding column 215 is connected to the condensate inlet at the lower end of the valve body 1.

[0047] When the expansion valve is working, the temperature inside the vent at the upper end of the valve body 1 is sensed by the self-locking valve body switch drive assembly 3. When the temperature at the upper end of the valve body 1 is high, the self-locking valve body switch drive assembly 3 drives the rotating push plate 213 to move downward under the limit of the limiting groove 211. The rotating push plate 213 drives the limiting protrusion 214 to move downward. At the same time, the limiting protrusion 214 drives the rotating push plate 213 to rotate under the limit of the threaded groove 212. The rotating push plate 213 drives the square sliding column 215 to move downward and rotate. Both the square sliding column 215 and the central sliding groove of the rotating cylinder 216 are square, so that the square sliding column 215 slides downward inside the rotating cylinder 216 while driving the rotating cylinder 216 to rotate. The rotating cylinder 216 drives the linkage rod 221 to rotate, and the linkage rod 221 drives the rotating plate 224 to rotate under the limitation of the valve opening slot 222 and the two sets of limiting baffles 223. This causes the opening between the liquid storage tank 225 and the limiting groove 211 to gradually increase. Since the condensate inlet is connected to the condensate outlet through the liquid storage tank 225 and the limiting groove 211, when... When the opening between the liquid storage tank 225 and the limiting groove 211 increases, the amount of condensate entering the condensate outlet increases, thereby increasing the cooling effect. When the temperature inside the vent hole above the valve body 1 is low, the self-locking valve body switch drive assembly 3 drives the rotating push plate 213 to move upward. The rotating push plate 213 drives the limiting protrusion 214 to move upward under the limitation of the threaded groove 212 and rotate simultaneously. The limiting protrusion 214 drives the linkage rod 221 to rotate through the square sliding column 215 and the rotating cylinder 216. The linkage rod 221 drives the rotating plate 2 Rotating plate 224 rotates and gradually seals the opening between the liquid storage tank 225 and the limiting groove 211, thereby reducing the flow rate of condensate and thus reducing the cooling effect. This, in turn, increases the temperature inside the vent at the upper end of valve body 1. As the rotating plate 224 gradually opens and closes the opening between the liquid storage tank 225 and the limiting groove 211, the flow rate of condensate can be controlled more precisely, and the temperature inside the vent at the upper end of valve body 1 can be controlled more precisely, preventing overheating or overcooling.

[0048] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 ,and Figure 8 As shown, in a preferred embodiment of the present invention, the self-locking valve body switch drive assembly 3 includes an adaptive drive assembly 31 and a press-type locking assembly 32. The upper end of the valve body 1 is connected to the adaptive drive assembly 31, the bottom of the adaptive drive assembly 31 is rotatably connected to the top of the rotating push plate 213, the outer end of the adaptive drive assembly 31 is connected to the press-type locking assembly 32, and the outer end of the press-type locking assembly 32 is connected to the upper end of the valve body 1.

[0049] The adaptive drive assembly 31 includes a mounting groove 311, a support frame 312, a frustum-shaped protrusion 313, an elastic heat-sensing plate 314, and a linkage push rod 315. The upper end of the valve body 1 has a mounting groove 311. The lower end of the support frame 312 is engaged inside the mounting groove 311. The top of the support frame 312 is fixedly connected to the frustum-shaped protrusion 313. The lower end of the frustum-shaped protrusion 313 is engaged with the elastic heat-sensing plate 314. A linkage push rod 315 is fixedly connected to the bottom center of the elastic heat-sensing plate 314. The lower end of the moving push rod 315 passes through the bottom plate of the support frame 312 and is rotatably connected to the top of the rotating push plate 213. The closed space between the elastic heat-sensing plate 314 and the frustum-shaped protrusion cover 313 contains a temperature-sensing reagent. The support frame 312, the mounting groove 311 and the limiting groove 211 are connected. When the elastic heat-sensing plate 314 is deformed, the rotating plate 224 and the limiting baffle 223 combine to form a complete circle and completely seal the opening between the liquid storage tank 225 and the limiting groove 211.

[0050] The push-type locking assembly 32 includes an unlocking groove 321, a locking slider 322, a first spring 323, an unlocking slide post 324, a pressing ring 325, a limiting guide slide post 326, and a second spring 327. Several sets of unlocking grooves 321 are formed on the side wall of the support frame 312. A groove is formed on the valve body 1 outside each unlocking groove 321. A locking slider 322 is slidably connected inside each groove. A first spring 323 is fixedly connected between the locking slider 322 and the inner wall of the groove away from the support frame 312. A set of unlocking slide pins 324 are slidably connected inside the locking slide groove 321. The lower end of the unlocking slide pin 324 is slidably connected to the locking slider 322. A pressing ring 325 is fixedly connected to the top of the unlocking slide pin 324. Several sets of limiting guide slide pins 326 are fixedly connected to the bottom of the pressing ring 325. The limiting guide slide pins 326 pass through the top plate of the valve body 1 and are fixedly connected to a baffle. A second spring 327 is fixedly connected between the baffle and the inner top of the valve body 1. The end of the locking slider 322 near the support frame 312 is an inclined surface.

[0051] When the expansion valve is working, the temperature sensing reagent inside the elastic heat-sensing plate 314 and the frustum-shaped protrusion 313 senses the temperature inside the vent at the upper end of the valve body 1. When the temperature inside the vent is high, the temperature sensing reagent expands and compresses the elastic heat-sensing plate 314, causing it to deform. The expansion of the elastic heat-sensing plate 314 drives the linkage push rod 315 downward, which in turn drives the rotating push plate 213 downward. When the temperature inside the vent decreases, the temperature sensing reagent contracts. Under the restoring force of the elastic heat-sensing plate 314, it drives the linkage push rod 315 upward, which in turn drives the frustum-shaped protrusion 313 upward. This achieves adaptive adjustment of the rotary progressive opening. The valve assembly 2 operates by regulating the temperature of the vent at the upper end of the valve body 1. When the elastic heat-sensing plate 314 or the temperature-sensing reagent needs to be replaced, the pressing ring 325 is pressed down. The pressing ring 325 drives the limiting guide slide 326 and the unlocking slide 324 to move downward. The limiting guide slide 326 moves downward and pulls the second spring 327, causing the second spring 327 to deform. The unlocking slide 324 moves downward in the unlocking groove 321 until it contacts the inclined surface of the locking slider 322 and continues to move downward. The unlocking slide 324 presses the locking slider 322, causing the locking slider 322 to slide into the groove. At this time, the locking slider 322 presses the first spring 323, causing the first spring 323 to deform. When the locking slider 322 leaves the unlocking groove 321, the support frame 312 is pulled out of the mounting groove 311. The support frame 312 drives the frustum-shaped protrusion 313 and the elastic heat-sensing plate 314 to move upward. The elastic heat-sensing plate 314 drives the rotating push plate 213 to move upward through the linkage push rod 315, thereby disassembling the elastic heat-sensing plate 314, the linkage push rod 315, and the rotating push plate 213. This allows the elastic heat-sensing plate 314 and the temperature-sensing reagent to be replaced or filled, making it easy to disassemble the elastic heat-sensing plate 314 and facilitate repair. When the repair is completed, the support frame 312 is put back into the mounting groove 311, and the rotating push plate 213 is aligned with the limiting groove 211. When the unlocking groove 321 and the locking slider 322 are aligned, and the support frame 312 is fully inserted into the mounting groove 311, the pressing ring 325 is released. Under the action of the restoring force of the second spring 327, the second spring 327 drives the pressing ring 325 to move upward through the limiting guide slide 326. The pressing ring 325 drives the unlocking slide 324 to move upward. At this time, under the action of the restoring force of the first spring 323, the first spring 323 drives the locking slider 322 to move closer to the support frame 312. When the end of the locking slider 322 close to the support frame 312 enters the interior of the unlocking groove 321, the support frame 312 is locked, thus making the installation and locking simple and convenient to operate.

[0052] In some embodiments, such as Figure 1-2As shown in Figures 4-7, in a preferred embodiment of the present invention, the self-limiting manual adjustment assembly 4 includes a ratchet 41, a rotating plate 42, a first rotating shaft 43, a torsion spring 44, a pawl 45, a second rotating shaft 46, a cam 47, a switching rod 48, and a limiting stop 49. The linkage rod 221 passes through the valve body 1 below the liquid storage tank 225 and is fixedly connected to the ratchet 41. A cylindrical mounting cover is fixedly connected to the bottom of the valve body 1. The limiting groove 211 passes through the ratchet 41 and the bottom plate of the mounting cover and is fixedly connected to the rotating plate 42. A first rotating shaft 43 is fixedly connected to the bottom of the outer valve body 1. A torsion spring 44 is fixedly connected to the outer end of the first rotating shaft 43. A pawl 45 is fixedly connected to the outer end of the torsion spring 44. The end of the pawl 45 near the ratchet 41 is engaged with the ratchet 41. A second rotating shaft 46 is rotatably connected to the bottom of the valve body 1 on the side of the pawl 45 near the ratchet 41. The second rotating shaft 46 passes through the cam 47 and the bottom plate of the mounting cover and is fixedly connected to the switching rod 48. Limiting stops 49 are fixedly connected to the bottom of the mounting cover on both sides of the switching rod 48.

[0053] When the self-locking valve body switch drive assembly 3 malfunctions and cannot drive the rotary progressive valve opening assembly 2 for adjustment, the rotating plate 42 is rotated. The rotating plate 42 drives the ratchet 41 to rotate via the linkage rod 221, and the linkage rod 221 drives the rotating plate 224 to rotate, thereby realizing the adjustment of the opening size between the liquid storage tank 225 and the limiting groove 211, thus realizing manual adjustment. Rotating the switching rod 48 causes the switching rod 48 to contact a set of limiting stops 49 away from the pawl 45. At this time, the pawl 45 rotates towards the ratchet 41 under the restoring force of the torsion spring 44, and the end of the pawl 45 near the ratchet 41 engages with the ratchet 41. At this time, the ratchet 41 is locked by the pawl 45, so that the rotating plate 224 can be locked when the expansion valve is in use. 24 will not rotate, thus preventing the rotary progressive valve opening assembly 2 from being incorrectly adjusted due to a malfunction of the self-locking valve body switch drive assembly 3, which could lead to overcooling or overheating. When the self-locking valve body switch drive assembly 3 is repaired, the switching lever 48 is rotated so that it contacts a set of limit stops 49 near the pawl 45. At this time, the second shaft 46 drives the cam 47 to rotate until the cam 47 contacts the pawl 45. The second shaft 46 is then rotated again, and the cam 47 presses the pawl 45, causing the pawl 45 to rotate away from the ratchet 41, thereby unlocking the ratchet 41 and allowing the expansion valve to be used normally. This enables emergency manual adjustment or closure of the condensate passage in case of expansion valve failure.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A regulating automotive expansion valve, comprising a valve body (1), characterized in that: A rotary progressive valve assembly (2) for progressively regulating the flow of condensate is connected to the middle of the valve body (1). The upper end of the valve body (1) is connected to a self-locking valve body switch drive assembly (3) for adaptive drive of rotary progressive valve opening assembly (2) and easy disassembly. The top of the rotary progressive valve opening assembly (2) is rotatably connected to the bottom of the self-locking valve body switch drive assembly (3). The lower end of the valve body (1) is connected to a self-limiting manual adjustment assembly (4) for manually adjusting and switching the state of the rotary progressive opening valve assembly (2). The rotary progressive valve opening assembly (2) includes a linkage rotary assembly (21) and a progressive valve opening assembly (22). The linkage rotary assembly (21) is connected to the middle of the upper end of the valve body (1). The progressive valve opening assembly (22) is fixedly connected to the bottom of the linkage rotary assembly (21). The self-limiting manual adjustment assembly (4) is fixedly connected to the lower end of the progressive valve opening assembly (22). The self-locking valve body switch drive assembly (3) is rotatably connected to the top of the linkage rotary assembly (21). The upper end of the valve body (1) is provided with a vent hole that penetrates the upper end of the valve body (1), and the lower end of the valve body (1) is provided with a condensate inlet and a condensate outlet on both sides respectively. The linkage rotating assembly (21) includes a limiting groove (211), a threaded groove (212), a rotating pusher (213), a limiting protrusion (214), a square sliding column (215), and a rotating cylinder (216). The valve body (1) has a limiting groove (211) in the middle. The limiting groove (211) tapers in a stepped shape from top to bottom. A threaded groove (212) is provided on the inner wall of the upper end of the limiting groove (211). The rotating pusher (213) is slidably connected to the inner wall of the upper end of the limiting groove (211). The outer end of the rotating pusher (213) is... A fixed connection is provided with a limiting protrusion (214). The end of the limiting protrusion (214) near the rotating push plate (213) is slidably connected to the inside of the rotating push plate (213). A square sliding column (215) is fixedly connected to the bottom of the rotating push plate (213). A rotating cylinder (216) is rotatably connected to the middle of the limiting groove (211). A square slot is opened in the middle of the rotating cylinder (216). The lower end of the square sliding column (215) is slidably connected to the inside of the square slot. The lower end of the limiting groove (211) is connected to the condensate outlet at the lower end of the valve body (1). The progressive valve opening assembly (22) includes a linkage rod (221), a valve opening slot (222), a limiting baffle (223), a rotating plate (224), and a liquid storage tank (225). The bottom of the rotating cylinder (216) is fixedly connected to the linkage rod (221). The valve body (1) below the limiting slot (211) has a valve opening slot (222), and the valve body (1) below the valve opening slot (222) has a liquid storage tank (225). The limiting slot (211), the valve opening slot (222), and the liquid storage tank (225) are connected. The progressive valve opening assembly (22) is internally fixedly connected to two sets of horizontally placed limiting baffles (223) with overlapping vertical positions. All baffles (223) are semicircular. A rotating plate (224) is slidably connected in the middle of the two sets of limiting baffles (223). The rotating plate (224) and the limiting baffles (223) are combined to form a complete circle. The linkage rotating rod (221) passes through the two sets of limiting baffles (223) and the rotating plate (224). The linkage rotating rod (221) is rotatably connected to both sets of limiting baffles (223). The linkage rotating rod (221) is fixedly connected to the rotating plate (224). The linkage rotating rod (221) passes through the valve body (1) below the liquid storage tank (225) and is fixedly connected to the self-limiting manual adjustment component (4). The outer side of the upper end of the square sliding column (215) is connected to the condensate inlet at the lower end of the valve body (1). The self-locking valve body switch drive assembly (3) includes an adaptive drive assembly (31) and a press-type locking assembly (32). The upper end of the valve body (1) is connected to the adaptive drive assembly (31). The bottom of the adaptive drive assembly (31) is rotatably connected to the top of the rotating push plate (213). The outer end of the adaptive drive assembly (31) is connected to the press-type locking assembly (32). The outer end of the press-type locking assembly (32) is connected to the upper end of the valve body (1). The adaptive drive assembly (31) includes a mounting groove (311), a support frame (312), a frustum-shaped protrusion (313), an elastic heat-sensing plate (314), and a linkage push rod (315). The upper end of the valve body (1) is provided with a mounting groove (311). The lower end of the support frame (312) is snapped into the interior of the mounting groove (311). The top of the support frame (312) is fixedly connected to the frustum-shaped protrusion (313). The lower end of the frustum-shaped protrusion (313) is snapped into the elastic heat-sensing plate (314). The bottom middle position of the elastic heat-sensing plate (314) is fixedly connected to... There is a linkage push rod (315). The lower end of the linkage push rod (315) passes through the bottom plate of the support frame (312) and is rotatably connected to the top of the rotating push plate (213). The closed space between the elastic heat-sensing plate (314) and the frustum-shaped protrusion (313) contains a temperature-sensing reagent. The support frame (312), the mounting groove (311) and the limiting groove (211) are connected. When the elastic heat-sensing plate (314) is deformed, the rotating plate (224) and the limiting baffle (223) combine to form a complete circle and completely seal the opening between the liquid storage tank (225) and the limiting groove (211). The rotating plate (224) rotates under the limit of the valve opening slot (222) and the two sets of limiting baffles (223), which can adjust the size of the opening between the liquid storage tank (225) and the limiting slot (211); The condensate inlet is connected to the condensate outlet through the storage tank (225) and the limiting tank (211).

2. The adjustable automotive expansion valve according to claim 1, characterized in that, The press-type locking assembly (32) includes an unlocking groove (321), a locking slider (322), a first spring (323), an unlocking slide post (324), a pressing ring (325), a limiting guide slide post (326), and a second spring (327). Several sets of unlocking grooves (321) are provided on the side wall of the support frame (312). A groove is provided on the valve body (1) outside each unlocking groove (321). A locking slider (322) is slidably connected inside each groove. A first spring (323) is fixedly connected between the locking slider (322) and the inner wall of the groove away from the support frame (312). The unlocking slide (321) is slidably connected to a set of unlocking slides (324). The lower end of the unlocking slide (324) is slidably connected to the locking slider (322). The top of the unlocking slide (324) is fixedly connected to a pressing ring (325). The bottom of the pressing ring (325) is fixedly connected to several sets of limiting guide slides (326). The limiting guide slides (326) pass through the top plate of the valve body (1) and are fixedly connected to a baffle. A second spring (327) is fixedly connected between the baffle and the inner top of the valve body (1). The end of the locking slider (322) near the support frame (312) is an inclined surface.

3. The adjustable automotive expansion valve according to claim 2, characterized in that, The self-limiting manual adjustment assembly (4) includes a ratchet (41), a rotating plate (42), a first rotating shaft (43), a torsion spring (44), a pawl (45), a second rotating shaft (46), a cam (47), a switching rod (48), and a limiting stop (49). The linkage rod (221) passes through the valve body (1) below the liquid storage tank (225) and is fixedly connected to the ratchet (41). A cylindrical mounting cover is fixedly connected to the bottom of the valve body (1). The limiting groove (211) passes through the bottom plate of the ratchet (41) and the mounting cover and is fixedly connected to the rotating plate (42). The valve body (1) outside the ratchet (41) is fixedly connected to the rotating plate (42). A first rotating shaft (43) is fixedly connected to the bottom of the valve body (1). A torsion spring (44) is fixedly connected to the outer end of the first rotating shaft (43). A pawl (45) is fixedly connected to the outer end of the torsion spring (44). The end of the pawl (45) near the ratchet (41) is engaged with the ratchet (41). A second rotating shaft (46) is rotatably connected to the bottom of the valve body (1) on the side of the pawl (45) near the ratchet (41). The second rotating shaft (46) passes through the cam (47) and the bottom plate of the mounting cover and is fixedly connected to the switching rod (48). Limiting stops (49) are fixedly connected to the bottom of the mounting cover on both sides of the switching rod (48).

4. A method of using the adjustable automotive expansion valve as described in claim 3, characterized in that: The specific steps are as follows: Step 1: The temperature inside the vent at the top of the valve body (1) is sensed by the temperature-sensing reagent inside the elastic heat-sensing plate (314) and the frustum-shaped protrusion (313). When the temperature inside the vent is high, the temperature-sensing reagent expands and squeezes the elastic heat-sensing plate (314), causing the elastic heat-sensing plate (314) to deform. The expansion of the elastic heat-sensing plate (314) drives the linkage push rod (315) to move downward. The linkage push rod (315) drives the rotating push plate (213) to move downward. When the temperature inside the vent decreases, the temperature-sensing reagent contracts. Under the action of the restoring force of the elastic heat-sensing plate (314), the elastic heat-sensing plate (314) drives the linkage push rod (315) to move upward. The linkage push rod (315) drives the frustum-shaped protrusion (313) to move downward. The platform-shaped protrusion (313) moves upward. When it is necessary to replace the elastic heat-sensing plate (314) or the temperature-sensing reagent, press down the pressing ring (325). The pressing ring (325) drives the limiting guide slide (326) and the unlocking slide (324) to move downward. The limiting guide slide (326) moves downward and pulls the second spring (327), causing the second spring (327) to deform. The unlocking slide (324) moves downward in the unlocking groove (321) until it contacts the inclined surface of the locking slider (322) and continues to move downward. The unlocking slide (324) squeezes the locking slider (322), causing the locking slider (322) to slide into the groove. At this time, the locking slider (322) is locked. 22) Squeezing the first spring (323) causes the first spring (323) to deform. When the locking slider (322) leaves the unlocking groove (321), the support frame (312) is pulled out of the mounting groove (311). The support frame (312) drives the frustum-shaped protrusion (313) and the elastic heat-sensing plate (314) to move upward. The elastic heat-sensing plate (314) drives the rotating push plate (213) to move upward through the linkage push rod (315). The support frame (312) is put back into the mounting groove (311). At this time, the rotating push plate (213) is aligned with the limiting groove (211), and the unlocking groove (321) is aligned with the locking slider (322). When the support frame... When the frame (312) is fully inserted into the mounting slot (311), the pressing ring (325) is released. Under the action of the restoring force of the second spring (327), the second spring (327) drives the pressing ring (325) to move upward through the limiting guide slide (326). The pressing ring (325) drives the unlocking slide (324) to move upward. At this time, under the action of the restoring force of the first spring (323), the first spring (323) drives the locking slider (322) to move towards the support frame (312). When the end of the locking slider (322) close to the support frame (312) enters the unlocking slide (321), the locking of the support frame (312) is completed. Step 2: The temperature inside the vent at the upper end of the valve body (1) is sensed by the self-locking valve body switch drive assembly (3). When the temperature at the upper end of the valve body (1) is high, the self-locking valve body switch drive assembly (3) drives the rotating push plate (213) to move downward under the limit of the limiting groove (211). The rotating push plate (213) drives the limiting protrusion (214) to move downward. At the same time, the limiting protrusion (214) moves downward and drives the rotating push plate (213) to rotate under the limit of the threaded groove (212). The plate (213) drives the square sliding column (215) to move downwards and rotate. Since the sliding groove in the middle of the square sliding column (215) and the rotating cylinder (216) are both square, the square sliding column (215) slides downwards inside the rotating cylinder (216) while driving the rotating cylinder (216) to rotate. The rotating cylinder (216) drives the linkage rod (221) to rotate. The linkage rod (221) drives the rotating plate (224) to rotate under the limitation of the valve opening slot (222) and the two sets of limiting baffles (223), thereby making the storage The opening between the liquid tank (225) and the limiting groove (211) gradually increases. The condensate inlet is connected to the condensate outlet through the liquid storage tank (225) and the limiting groove (211). When the opening between the liquid storage tank (225) and the limiting groove (211) increases, the amount of condensate entering the condensate outlet increases. When the temperature inside the vent hole above the valve body (1) is low, the self-locking valve body switch drive assembly (3) drives the rotating push plate (213) to move upward. The rotating push plate (213) drives the limiting protrusion (211) to move upward. 14) While moving upward under the limit of the threaded groove (212), the limiting protrusion (214) drives the linkage rod (221) to rotate through the square sliding column (215) and the rotating cylinder (216). The linkage rod (221) drives the rotating plate (224) to rotate. The rotating plate (224) rotates and gradually seals the opening between the liquid storage tank (225) and the limiting groove (211). When the rotating plate (224) rotates, it gradually opens and closes the opening between the liquid storage tank (225) and the limiting groove (211). Step 3: When the self-locking valve body switch drive assembly (3) fails to drive the rotary progressive opening valve assembly (2) for adjustment, rotate the rotating plate (42). The rotating plate (42) drives the ratchet (41) to rotate through the linkage rod (221). The linkage rod (221) drives the rotating plate (224) to rotate, thereby realizing the adjustment of the opening size between the liquid storage tank (225) and the limiting groove (211), thus realizing manual adjustment. Rotate the switching rod (48) so that the switching rod (48) contacts a set of limiting stops (49) away from the pawl (45). At this time, the pawl (45) moves closer to the ratchet (41) under the restoring force of the torsion spring (44). The direction is rotated and the pawl (45) is close to the ratchet (41) and engaged with the ratchet (41). At this time, the ratchet (41) is locked by the pawl (45). When the self-locking valve body switch drive assembly (3) is repaired, the switching rod (48) is rotated so that the switching rod (48) contacts a set of limit stops (49) close to the pawl (45). At this time, the second shaft (46) drives the cam (47) to rotate until the cam (47) contacts the pawl (45). At this time, the second shaft (46) continues to rotate, and the cam (47) squeezes the pawl (45) so that the pawl (45) rotates away from the ratchet (41) so that the ratchet (41) is unlocked.

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