A method for manufacturing an electronic expansion valve body

Abstract

The application discloses a kind of electronic expansion valve valve body production manufacturing method, belong to electronic expansion valve production manufacturing technical field.Mainly including beforehand ready valve seat assembly, valve needle assembly, magnetic ring assembly, sleeve, installation support to prepare to use;Valve needle assembly is assembled with valve seat assembly, and is welded integrally to obtain a weld semi-finished product;One weld semi-finished product is assembled with magnetic ring assembly integrally to obtain electronic expansion valve semi-finished product assembly;The magnetic ring assembly of electronic expansion valve semi-finished product assembly is welded integrally with valve needle assembly to obtain two weld semi-finished product and the like operation steps.The present application realizes the automation intelligent manufacturing of electronic expansion valve valve body to the greatest extent, simplifies electronic expansion valve production procedure, and synchronous method is unique, ingenious, while guaranteeing the reliability of electronic expansion valve valve body, provides optimal scheme for the automation manufacturing of electronic expansion valve valve body, has very important significance in electronic expansion valve manufacturing field.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electronic expansion valve production and manufacturing, in particular, especially relates to an electronic expansion valve valve body production and manufacturing method with the advantages of easy intelligent manufacturing, greatly reduced proportion of manual operation, significantly reduced influence of human factors on product quality, simplified electronic expansion valve production process, unique opening degree synchronization method, high product reliability, high valve body opening degree synchronization precision, great convenience for subsequent product detection work, high product yield, and provision of an optimal solution for the automated intelligent manufacturing of electronic expansion valve valve bodies. BACKGROUND

[0002] An electronic expansion valve used for adjusting the flow of refrigerant in a refrigeration system such as an air conditioner includes a valve body and a coil. The flow of refrigerant is controlled by driving the opening degree of a valve needle in the valve body through the coil, thereby achieving the effect of controlling the temperature. The components of the electronic expansion valve valve body have the characteristics of large quantity, small size, complex assembly, and high precision requirements. As introduced in the background art of the Chinese patent document with the authorization announcement number CN214197267U: the valve body mainly includes a rotor (magnetic ring), a valve needle assembly, a stop lever, a rotary spring (stop ring), a valve core, a valve core fixing ring, a guide rail spring, a valve seat, a gas outlet (vertical connecting pipe), and a gas inlet (horizontal connecting pipe).

[0003] The Chinese patent with the authorization announcement number CN109424750B discloses an assembly method of an electronic expansion valve, which mainly includes:

[0004] Step S1: manually connect the guide vane and the valve needle part and adjust the positional relationship between the two. The guide vane is installed into the end of the screw part away from the valve needle, that is, the first section of the guide vane is first installed into the middle section position of the screw part; then the screw part is twisted to find the required flow position, and the stop valve on the second section of the guide vane is rotated to find the specified lower limit position.

[0005] Step S2: weld and fix the guide vane and the valve needle part.

[0006] Step S3: if the flow is qualified, weld and fix the rotor body and the valve needle part. The rotor body formed by the connecting plate in the rotor part and the magnet steel is turned into the top section position of the screw part, and then the rotor body and the screw part are welded and fixed.

[0007] The valve body manufacturing method of the electronic expansion valve provided in the CN109424750B patent document is to assemble the guide vane (stopper rod) first and then assemble the rotor body to meet the valve needle opening degree as consistent as possible, that is, the welding of the traditional guide vane and the connecting plate is changed to the welding of the guide vane and the valve needle. However, in fact, the structural design reliability is relatively poor, the product is easy to break, and the service life is short; that is, the technical solution provided in the CN109424750B patent document sacrifices the reliability of the product in order to make the product flow (the size of the opening degree determines the size of the flow) as consistent as possible. The specific reason is analyzed as follows: the guide vane is relatively thin (which is also mentioned in the CN109424750B patent document in paragraph 0038 of the specification), the valve needle diameter is also relatively small, the guide vane is directly welded with the valve needle, and the guide vane is naturally provided with a circular hole with a small diameter matched with the valve needle, the welding area is small, the welding thickness is thin, the welding firmness between the valve needle and the guide vane is relatively poor, the guide vane rotates with the rotor, and is limited by the upper and lower limit positions of the stop ring. The impact force caused by the limit will inevitably occur at the upper and lower limit positions, although the impact force is not large, the welding firmness between the valve needle and the guide vane is relatively poor, and the welding between the valve needle and the guide vane will fail after a period of use.

[0008] In addition, the method of the CN109424750B patent document has large difficulty in automatic implementation, large proportion of manual operation in each process, high production cost, poor valve body opening degree synchronization precision, inaccurate product comprehensive performance test stage data, and relatively poor product quality. SUMMARY

[0009] The purpose of the present application is to overcome the shortcomings of the prior art, provide an electronic expansion valve valve body production and manufacturing method which is easy to integrate with intelligent manufacturing, greatly reduces the proportion of manual operation, significantly reduces the influence of human factors on product quality, simplifies the production process of the electronic expansion valve, has a unique opening degree synchronization method, has high product reliability, high valve body opening degree synchronization precision, brings great convenience to subsequent product detection work, has high product yield, and provides an optimal solution for the automatic intelligent manufacturing of the electronic expansion valve valve body.

[0010] The present application is realized by the following technical solutions:

[0011] An electronic expansion valve valve body production and manufacturing method, comprising the following operation steps:

[0012] Step a: prepare the valve seat assembly, valve needle assembly, magnetic ring assembly, sleeve and mounting bracket in advance for use; the valve seat assembly comprises a valve seat, a vertical connecting pipe and a horizontal connecting pipe; the valve needle assembly comprises a valve needle assembly, a valve core, a valve core fixing ring, a guide rail spring and a stop ring; the magnetic ring assembly comprises a magnetic ring, a magnetic ring insert and a stopper rod integrally welded with the magnetic ring insert;

[0013] Step b: Assemble the valve needle assembly with the valve seat assembly and weld them together to obtain a welded semi-product;

[0014] Step c: Assemble the product of step b with the magnetic ring assembly to obtain an electronic expansion valve semi-product assembly;

[0015] Step d: Weld the product of step c together to obtain a two-welded semi-product;

[0016] Step e: Weld the product of step d with the sleeve and mounting bracket in sequence to obtain the electronic expansion valve body.

[0017] Preferably, the stop ring on the valve needle assembly in step a is rotated to a uniform position on the guide rail spring, which is the initial position.

[0018] After step c and before step d, the valve needle of the electronic expansion valve semi-product assembly is rotated forward until the opening between the valve needle and the valve seat assembly reaches the "zero position" as determined by the flow leak detector, and then the magnetic ring angle calibration action is performed, i.e., the magnetic ring assembly in the electronic expansion valve semi-product assembly is rotated to rotate the stop ring on the valve needle assembly to a new uniform position to reserve a rotation stroke for the pulse-driven valve needle forward rotation.

[0019] The pulse-driven action is performed at any stage during the electronic expansion valve body comprehensive performance test, i.e., the magnetic ring assembly is driven to rotate by a set number of pulses to continue the forward rotation of the valve needle of the valve needle assembly to make the opening between the valve needle and the valve seat assembly reach the "locked" state.

[0020] Preferably, the pulse-driven action is performed as a pre-process of the first performance test in the electronic expansion valve body comprehensive performance test.

[0021] Preferably, the initial position of the stop ring on the valve needle assembly in step a on the guide rail spring is the lower limit position.

[0022] Preferably, the "zero position" is achieved by a closing point synchronization mechanism assembly, which includes a valve needle screwing mechanism and a screwing detection mechanism.

[0023] The valve needle screwing mechanism includes a screwing vertical plate fixed on the workbench and a rotating clamp jaw moving up and down relative to the screwing vertical plate, and a closing screw clamp jaw head adapted to the valve needle of the electronic expansion valve semi-product assembly is fixed on the rotating clamp jaw; the rotating clamp jaw is connected to an elastic member fixing seat fixed at the upper end position of the screwing vertical plate through an elastic member, and the rotating clamp jaw is also slidingly connected to a floating guide shaft with limit points at both ends, and the upper end of the floating guide shaft is fixedly connected to the driving end of a power element.

[0024] The screwing detection mechanism comprises a product connecting seat for bearing the electronic expansion valve semi-finished product assembly, and a connector fixing seat arranged below the product connecting seat for fixing a quick connector for connecting the electronic expansion valve semi-finished product assembly and the flow leak detector.

[0025] Preferably, the power element is a mini air cylinder; the rotating clamp jaw is an electric rotating clamp jaw;

[0026] The electric rotating clamp jaw is slidingly connected with a linear guide rail fixed on a screwing vertical plate through a slider assembly, the slider assembly is clearance-fitted with a shaft body of a floating guide shaft through a guide seat, an end of the floating guide shaft is fixedly provided with a guide shaft blocking ring, and an upper end of the floating guide shaft is fixedly provided with a limiting connector, which is fixedly connected with a piston rod of the mini air cylinder.

[0027] Preferably, the elastic element is a tension spring, an upper end of the tension spring is connected with a universal joint bolt one fixed on the elastic element fixing seat, and a lower end of the tension spring is connected with a universal joint bolt two fixed on the slider assembly.

[0028] Preferably, an upper end of the quick connector is connected with a vertical connecting pipe of the electronic expansion valve semi-finished product assembly, and a lower end of the quick connector is connected with the flow leak detector through a hose.

[0029] Preferably, the magnetic ring angle calibration action is realized by a magnetic ring angle calibration mechanism assembly.

[0030] The magnetic ring angle calibration mechanism assembly comprises a valve needle clamping mechanism and a magnetic ring driving mechanism.

[0031] The valve needle clamping mechanism comprises a calibration sliding table cylinder fixed on the workbench and reciprocating in the X-axis direction, a calibration finger cylinder is fixed on a calibration sliding table of the calibration sliding table cylinder, and a calibration screw clamp jaw head for stabilizing the valve needle is fixedly arranged at a clamp jaw connecting end of the calibration finger cylinder.

[0032] The magnetic ring driving mechanism comprises a rubber-coated wheel reciprocating in the X-axis direction, and the rubber-coated wheel drives the magnetic ring assembly to rotate under the action of a rotating driving mechanism.

[0033] Preferably, the rotating driving mechanism is a servo motor, and the rotating driving mechanism is connected with a sliding mechanism arranged on the workbench through a motor mounting seat; the sliding mechanism is a structure in which a ball screw is matched with a linear guide rail, and comprises a sliding block fixedly connected with the motor mounting seat, the sliding block moves along the linear guide rail, and a nut seat on the sliding block is threadedly connected with the ball screw, and the ball screw is driven by a linear driving mechanism.

[0034] Compared with the prior art, the present application has the following beneficial effects:

[0035] The present application integrates the parts which must rely on artificial assembly in a modular way, and after integration, all welding processes can be centralized, so that the automatic intelligent manufacturing of the valve body of the electronic expansion valve can be realized to the maximum extent, the production process of the electronic expansion valve is simplified, the proportion of manual operation is greatly reduced, and the influence of human factors on product quality is obviously reduced.

[0036] The synchronization method is unique, ingenious, does not need to sacrifice the reliability of the product to meet the synchronization of the valve body flow, and has very high synchronization precision, which brings great convenience to the subsequent product performance comprehensive detection link, and the accurate opening synchronization makes the product performance detection accurate and free of false measurement and false reporting, and the product yield is very high.

[0037] The present application has very important significance in the field of electronic expansion valve manufacturing, and provides an optimal scheme for the automatic manufacturing of the electronic expansion valve body while ensuring the reliability of the electronic expansion valve body. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is an overall structure schematic diagram of the electronic expansion valve body.

[0039] Figure 2 It is a sectional structure schematic diagram of the electronic expansion valve body.

[0040] Figure 3 It is a structure schematic diagram of the electronic expansion valve semi-finished product assembly part of the present application.

[0041] Figure 4 It is a structure schematic diagram of the valve needle total in the direction of the present application.

[0042] Figure 5 It is a method flow schematic diagram of embodiment 1 of the present application.

[0043] Figure 6 It is a schematic diagram of one of the deformation processes of embodiment 2 of the present application.

[0044] Figure 7 It is a structure schematic diagram of the left side of the closure point synchronization mechanism assembly in the direction of the present application.

[0045] Figure 8 It is a structure schematic diagram of the closure point synchronization mechanism assembly in the direction of the present application Figure 1 (Elastic member is not shown).

[0046] Figure 9 It is a structure schematic diagram of the right side of the closure point synchronization mechanism assembly in the direction of the present application (elastic member is not shown).

[0047] Figure 10 It is a structure schematic diagram of the closure point synchronization mechanism assembly in the direction of the present application Figure 2 (Elastic member is not shown).

[0048] Figure 11 is the overall structure of the magnetic ring angle calibration mechanism in the perspective view Figure 1 .

[0049] Figure 12 is the overall structure of the magnetic ring angle calibration mechanism in the perspective view Figure 2 .

[0050] Figure 13 is the overall structure of the magnetic ring angle calibration mechanism in the side view

[0051] In the figure:

[0052] 21, valve needle screwing mechanism; 211, screwing vertical plate; 212, rotating clamping jaw; 2121, closed screw rod clamping jaw head; 213, elastic member; 214, elastic member fixing seat; 2141, articulated bolt one; 2142, articulated bolt two; 215, floating guide shaft; 2151, shaft main body; 2152, guide shaft blocking ring; 2153, limiting connecting head; 216, power element; 2161, piston rod; 217, sliding block assembly; 218, linear guide rail; 219, guide seat;

[0053] 22, screwing detection mechanism; 221, product connecting seat; 222, quick connector; 223, connector fixing seat; 224, closed sliding table air cylinder; 2241, closed sliding table; 2242, sliding connecting seat;

[0054] 11, tool assembly table; 111, tool base; 112, valve seat positioning seat;

[0055] 31, valve needle clamping mechanism; 311, calibration sliding table air cylinder; 3111, calibration sliding table; 312, calibration finger air cylinder; 3121, calibration screw rod clamping jaw head;

[0056] 32, magnetic ring driving mechanism; 321, rubber-coated wheel; 322, rotating driving mechanism; 323, motor mounting seat; 324, sliding block; 325, linear slide rail; 326, linear driving mechanism;

[0057] 4, electronic expansion valve semi-finished product assembly; 41, valve needle assembly; 413, valve needle assembly; 4131, valve needle; 414, valve core; 415, valve core fixing ring; 416, guide rail spring; 417, stop ring; 42, magnetic ring assembly; 421, magnetic ring; 422, magnetic ring insert; 423, stop rod; 43, valve seat assembly; 431, vertical connecting pipe; 432, valve seat; 433, horizontal connecting pipe; 44, sleeve; 45, mounting bracket. DETAILED DESCRIPTION

[0058] In order for the reader to better understand the design purpose of the present application, the technical solutions described in the present application are further described and explained below in conjunction with the embodiments. It should be noted that the orientation terms that may be involved in the following paragraphs, including but not limited to "up, down, left, right, front, back" and the like, are based on the visual orientation shown in the drawings accompanying the specification, and should not be regarded as limiting the scope of protection or technical solutions of the present application. The purpose is only to facilitate those skilled in the art to better understand the technical solutions described in the present application.

[0059] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] Embodiment 1

[0061] As shown in Figure 5 , a method for producing and manufacturing an electronic expansion valve body, comprising the following operation steps:

[0062] Step a: as shown in Figures 1 to 3 , the valve seat assembly 43, the valve needle assembly 41, the magnetic ring assembly 42, the sleeve 44 and the mounting bracket 45 are prepared in advance for use. The valve seat assembly 43 comprises a valve seat 432, a vertical connecting pipe 431 and a horizontal connecting pipe 433. The magnetic ring assembly 42 comprises a magnetic ring 421, a magnetic ring insert 422 and a stop rod 423 integrally welded with the magnetic ring insert 422. The stop rod 423 is integrally welded with the magnetic ring insert 422, the welding area is large, and the welding is firm. As shown in Figure 4 , the valve needle assembly 41 comprises a valve needle assembly 413, a valve core 414, a valve core fixing ring 415, a guide rail spring 416 and a stop ring 417; at this time, the position of the stop ring 417 on the valve needle assembly 41 on the guide rail spring 416 is rotated to a uniform position, which is the initial position. The lower limit position of the initial position is selected in this embodiment, that is, the stop ring 417 is rotated to the lowermost position of the guide rail spring 416.

[0063] Step b: assemble the valve needle assembly 41 with the valve seat assembly 43, and integrally weld to obtain a welded semi-finished product;

[0064] Step c: assemble the product of step b with the magnetic ring assembly 42 to obtain an electronic expansion valve semi-finished product assembly 4;

[0065] Step d: welding the product of step c to obtain a two-weld semi-finished product; that is, welding the magnetic ring insert 422 of the magnetic ring assembly 42 of the electronic expansion valve semi-finished product assembly 4 and the valve needle 4131 of the valve needle assembly 41;

[0066] Step e: welding the product of step d in sequence with the sleeve 44 and the mounting bracket 45 to obtain the electronic expansion valve valve body.

[0067] The valve body structure is small and complex, and currently some processes must rely on manual operation. In this embodiment, the assembly that must rely on manual operation is modularized and integrated, and the valve seat assembly 43, the valve needle assembly 41, and the magnetic ring assembly 42 are the products after manual operation and integration. The modularized assembly is prepared in advance, and the remaining processes are only welding processes. The welding processes are centralized, which is easy to automate, so that the automatic production of the electronic expansion valve valve body can be maximized.

[0068] This embodiment maximizes the automatic intelligent manufacturing of the electronic expansion valve valve body, simplifies the production process of the electronic expansion valve, greatly reduces the proportion of manual operation, and significantly reduces the influence of human factors on product quality.

[0069] Embodiment 2

[0070] On the basis of the above-mentioned embodiments, this embodiment continues to describe the technical features involved therein and the functions and effects of the technical features in the present application in detail, so as to help those skilled in the art to fully understand the technical solutions of the present application and to reproduce them.

[0071] As shown in Figure 6 , a method for producing an electronic expansion valve valve body, comprising the following operation steps:

[0072] Step a: as shown in Figures 1 to 3 , the valve seat assembly 43, the valve needle assembly 41, the magnetic ring assembly 42, the sleeve 44, and the mounting bracket 45 are prepared in advance. The valve seat assembly 43 comprises a valve seat 432, a vertical connecting pipe 431, and a horizontal connecting pipe 433. The magnetic ring assembly 42 comprises a magnetic ring 421, a magnetic ring insert 422, and a stop rod 423 welded with the magnetic ring insert 422. The stop rod 423 is welded with the magnetic ring insert 422, the welding area is large, and the welding is firm. As shown in Figure 4 , the valve needle assembly 41 comprises a valve needle assembly 413, a valve core 414, a valve core fixing ring 415, a guide rail spring 416, and a stop ring 417. At this time, the position of the stop ring 417 on the guide rail spring 416 is rotated to a unified position, which is the initial position. In this embodiment, the initial position is selected to be the lower limit position, that is, the stop ring 417 is rotated to the lowermost position of the guide rail spring 416.

[0073] Step b: Assemble the valve needle assembly 41 with the valve seat assembly 43, and weld them together to get a welded semi-product.

[0074] Step c: Assemble the product of step b with the magnetic ring assembly 42 to get the electronic expansion valve semi-product assembly 4.

[0075] After the operation of step c, before the operation of step d, rotate the valve needle of the electronic expansion valve semi-product assembly in the positive direction until the flow leak detector determines that the opening between the valve needle 4131 and the valve seat assembly 43 reaches the "zero position" (so-called "zero position" or "closed point", which refers to the state that the needle head of the valve needle just contacts the valve port of the valve seat), and then stop rotating. When the flow leak detector determines that the valve body opening reaches the "zero position", the external force applied to the valve needle 4131 should be immediately stopped, otherwise it may cause the valve needle 4131 and the valve port of the valve seat 432 to be too tightly closed, resulting in "stuck" phenomenon. The driving force of the electronic pulse to drive the valve needle 4131 to rotate is relatively small, and if the "stuck" phenomenon occurs, the reverse electronic pulse cannot drive the valve needle 4131 to rotate in the reverse direction. The "zero position" does not mean that the flow between the valve needle 4131 and the valve seat 432 is the same at this time, and the production tolerance is inevitable. If it is expected that the flow between the valve needle 4131 and the valve seat 432 is completely synchronized, the most accurate is no flow, and after giving the reverse pulse, the valve needle 4131 needs to be able to open smoothly, and this "completely closed and smoothly reversed" state is the "locked" state of the valve needle 4131. Therefore, the subsequent magnetic ring angle calibration action needs to be operated, that is, the magnetic ring assembly 42 in the electronic expansion valve semi-product assembly is rotated to rotate the stop ring 417 on the valve needle assembly 41 to a new unified position to reserve a rotation stroke for the pulse driving the valve needle to rotate in the positive direction. The position of the stop ring 417 affects the stroke of the stop rod 423, so the position of the stop ring 417 of each product must also be synchronized; in order to facilitate production, the stop ring 417 is initially rotated to the lower limit position of the guide rail spring 416, but the subsequent valve needle 4131 needs to be driven in the positive direction by the electronic pulse, so this step needs to rotate the stop ring 417 in the reverse direction by a certain angle to reserve a stroke for the subsequent stop rod 423 to continue rotating in the positive direction.

[0076] Step d: Weld the product of step c to get a two-welded semi-product. After step d, the magnetic ring assembly 42 and the valve needle assembly 41 have been fixed together, and after the magnetic ring assembly 42 and the valve needle assembly 41 are fixed, the pulse driving action can be performed. That is, a positive pulse is given to the magnetic ring assembly 42, the stop rod 423 of the magnetic ring assembly 42 rotates with the magnetic ring 421, the rotation of the stop rod 423 drives the valve needle 4131 to continue rotating in the positive direction, at this time the valve needle 4131 and the valve port of the valve seat 432 are more closely contacted, reaching the state of no flow through, and the valve needle 4131 is continuously rotated by the electronic pulse, so when the reverse electronic pulse is given, the valve needle 4131 can be smoothly reversed and opened.

[0077] The pulse driving action can be performed at any stage after the operation of step d to the electronic expansion valve body comprehensive performance test stage. The pulse driving action refers to driving the magnetic ring assembly 42 to rotate by a set number of pulses, so that the valve needle of the valve needle assembly 41 continues to rotate in the positive direction to make the opening between the valve needle and the valve seat assembly 43 reach the “locked” state. Giving the valve body an electronic pulse requires designing a coil, and the coil must be used in the electronic expansion valve body comprehensive performance test stage. Therefore, placing the pulse driving action in the electronic expansion valve body comprehensive performance test stage can fully save resources. Moreover, the pulse driving action is used to calibrate the opening of the valve body and is the reference point of product testing. Therefore, the optimal operation timing of the pulse driving action is arranged before the electronic expansion valve body comprehensive performance test, that is, as a pre-process of the first performance test in the electronic expansion valve body comprehensive performance test.

[0078] Step e: welding the sleeve 44 and the mounting bracket 45 on the product of step d in sequence to obtain an electronic expansion valve body.

[0079] The embodiment integrates the parts that must be assembled manually in a modular manner. After integration, all welding processes can be centralized. This method is easy to maximize the automation and intelligent manufacturing of the electronic expansion valve body, simplifies the production process of the electronic expansion valve, greatly reduces the proportion of manual operation, and significantly reduces the influence of human factors on product quality.

[0080] The synchronization method of the embodiment is unique and ingenious. It not only does not sacrifice the reliability of the product to meet the synchronization of the valve body flow, but also has very high synchronization precision, which brings great convenience to the subsequent product performance comprehensive detection link. The precise opening synchronization makes the product performance detection accurate and free of false measurement and false reporting, and the product yield is very high.

[0081] The embodiment has very important significance in the field of electronic expansion valve manufacturing. It not only guarantees the reliability of the electronic expansion valve body, but also provides an optimal solution for the automated manufacturing of the electronic expansion valve body.

[0082] Embodiment 3

[0083] On the basis of embodiment 2, the technical features involved in the embodiment and the functions and effects of the technical features in the present application are described in detail to help those skilled in the art fully understand the technical solutions of the present application and reproduce them.

[0084] The “zero position” state in the above embodiment 2 is realized by a closing point synchronization mechanism assembly. As shown in FIG. 2, the closing point synchronization mechanism assembly includes a valve needle screwing mechanism 21 and a screwing detection mechanism 22. Figures 7 to 10

[0085] ​The valve needle screwing mechanism 21 comprises a screwing vertical plate 211 fixed on the workbench and a rotating clamp jaw 212 moving up and down relative to the screwing vertical plate 211, and the rotating clamp jaw 212 is fixedly provided with a closed screw jaw head 2121 matched with the valve needle 4131 of the electronic expansion valve semi-finished product assembly 4. The rotating clamp jaw 212 is connected with an elastic element fixing seat 214 fixed at the upper end position of the screwing vertical plate 211 through an elastic element 213, and the rotating clamp jaw 212 is also slidably connected with a floating guide shaft 215 provided with limiting points at both ends, and the upper end of the floating guide shaft 215 is fixedly connected with the driving end of a power element 216. The power element 216 drives the rotating clamp jaw 212 to move up and down reciprocatingly through the floating guide shaft 215.

[0086] The screwing detection mechanism 22 comprises a product connecting seat 221 for bearing the electronic expansion valve semi-finished product assembly 4, and a connector fixing seat 223 provided below the product connecting seat 221 for fixing a quick connector 222 for connecting the electronic expansion valve semi-finished product assembly 4 and the flow leak detector. The electronic expansion valve semi-finished product assembly 4 is placed in the product connecting seat 221 without freedom in the circumferential direction, and the quick connector 222 is fixed on the connector fixing seat 223, the upper end gas outlet of the quick connector 222 is directly connected with the vertical connecting pipe 431, and the lower end of the quick connector 222 is connected with the flow leak detector through a hose.

[0087] The so-called electronic expansion valve semi-finished product assembly 4 refers to including a valve needle assembly 41, a valve seat assembly 43 and a magnetic ring assembly 42, and is in a state that the valve needle assembly has been welded with the valve seat assembly, and the magnetic ring assembly and the valve needle assembly are only assembled and have not been welded. The action process of the closing point synchronization mechanism assembly in this embodiment is that the driving end of the power element 216 drives the floating guide shaft 215 to move downward. The floating guide shaft 215 is limited at both ends, and the middle section is slidably connected with the rotating clamp jaw 212, so that the floating guide shaft 215 cannot immediately drive the rotating clamp jaw 212 to move downward when it moves downward. The upper limit point of the floating guide shaft 215 needs to contact the rotating clamp jaw 212 to push the rotating clamp jaw 212 to move downward. When the closing screw jaw head 2121 of the rotating clamp jaw 212 reaches the specified position, the power element 216 stops acting. At this time, the elastic element 213 is in a stretched state, and the rotating clamp jaw 212 keeps in contact with the upper limit point of the floating guide shaft 215 under the action of the elastic element 213. At this time, the closing screw jaw head 2121 of the rotating clamp jaw 212 tightly holds the valve needle 4131 of the electronic expansion valve semi-finished product assembly 4, waiting for driving the valve needle 4131 to rotate. The gas flow released by the flow leak detector enters the quick connector 222, which is a mature connector used in air tightness test. After entering the quick connector 222, on the one hand, it uses gas pressure to tightly hold the vertical connecting pipe 431 through the side path, so that the vertical connecting pipe 431 and the quick connector 222 form a tight external connection; on the other hand, it enters the inside of the vertical connecting pipe 431 through the main path, which is used for the flow leak detector to detect the flow value in the path in real time. After the flow leak detector is connected, the rotating clamp jaw 212 drives the closing screw jaw head 2121 to rotate the valve needle in the positive direction. The valve port gradually becomes smaller, that is, the opening between the valve needle and the valve seat gradually becomes smaller. Correspondingly, the flow detected by the flow leak detector will change. When the detected flow value reaches the set threshold value, it means that the opening between the valve needle and the valve seat reaches "zero position", and the rotating clamp jaw 212 will stop rotating instantly. In this way, the opening between the valve needle and the valve seat of the electronic expansion valve reaches the "zero position" state, that is, not only the automatic rotation function of the valve needle is realized, but also the automatic judgment function of the "zero position" state of the opening is realized. The basic synchronization and consistency of the opening of the electronic expansion valve valve body are quickly realized in the manufacturing link of the product, the automation degree is high, the flow leak is accurately identified by cleverly using the flow leak, the valve needle position is accurate, the structure design is very clever, the device implementation cost is low, and it can be combined into the production line of the electronic expansion valve valve body without obstacles, which has very strong practicality and very important significance for the production and manufacturing of the electronic expansion valve valve body.

[0088] The semi-finished product processed by the closing point synchronization mechanism assembly is then grabbed by a mechanical hand and enters the magnetic ring angle calibration mechanism assembly. Figures 11 to 13As shown, the magnetic ring angle calibration mechanism assembly of the embodiment includes a valve needle clamping mechanism 31 and a magnetic ring driving mechanism 32. The valve needle clamping mechanism 31 includes a calibration slide cylinder 311 fixed on the workbench and reciprocating in the X-axis direction, a calibration finger cylinder 312 fixed on a calibration slide 3111 of the calibration slide cylinder 311, and a calibration screw clamp head 3121 fixed on a clamping jaw connecting end of the calibration finger cylinder 312 and serving to stabilize the valve needle 4131. The magnetic ring driving mechanism 32 includes a rubber-coated wheel 321 reciprocating in the X-axis direction, and the rubber-coated wheel 321 drives the magnetic ring assembly 42 to rotate under the action of a rotary driving mechanism 322. The rotary driving mechanism 322 of the embodiment is a servo motor, and the rotary driving mechanism 322 is connected to a sliding mechanism arranged on the workbench through a motor mounting seat 323. The sliding mechanism is of a structure in which a ball screw is matched with a linear slide rail 325, and the sliding mechanism includes a sliding block 324 fixed to the motor mounting seat 323, the sliding block 324 moves along the linear slide rail 325, and a nut seat on the sliding block 324 is threadedly connected with the ball screw (not shown in the figure), and the ball screw is driven by a linear driving mechanism 326. The rubber-coated wheel 321 is of a rubber-coated wheel with a polyurethane hardness of 75A-85A, which can neither damage the product nor generate a large driving force. The linear driving mechanism 326 is also a servo motor.

[0089] The electronic expansion valve semi-finished product assembly 4 is loaded in a tool assembly table 11 arranged on the workbench, and the valve seat assembly 43 embedded in the tool assembly table 11 has no degree of freedom in the circumferential direction.

[0090] The tool assembly table 11 includes a tool base 111 and a valve seat positioning seat 112 fixedly integrated with the tool base 111, and the valve seat positioning seat 112 is provided with an installation groove matched with the valve seat assembly 43.

[0091] The magnetic ring angle calibration mechanism assembly of the embodiment is arranged opposite to the valve needle clamping mechanism 31 and the magnetic ring driving mechanism 32. In operation, the calibration finger cylinder 312 of the valve needle clamping mechanism 31 moves towards the valve needle 4131 under the action of the calibration slide cylinder 311, and after reaching the set position, the calibration screw clamp jaw head 3121 of the calibration finger cylinder 312 clamps the valve needle 4131. Then the magnetic ring driving mechanism 32 acts, under the action of the linear driving mechanism 326, the ball screw rotates, drives the sliding block 324 connected therewith, the sliding block 324 slides along the linear slide rail 325 and drives the rubber-coated wheel 321 to contact the magnetic ring 421. According to the set rotation amplitude, the rotation driving mechanism 322 drives the rubber-coated wheel 321 to rotate by a certain angle, the rubber-coated wheel 321 synchronously drives the magnetic ring 421 to rotate by a certain angle in the opposite direction, the rotation of the magnetic ring 421 synchronously drives the rotation of the stop rod 423 fixed thereto, and the rotation of the stop rod 423 synchronously drives the rotation of the stop ring 417 along the guide rail spring 416, thereby changing the position of the stop ring 417 on the guide rail spring 416. The magnetic ring angle calibration mechanism assembly of the embodiment has high automation degree, high consistency of the manufactured products, reasonable and stable structure design, easy implementation and low implementation cost.

[0092] The embodiment modularly integrates parts that must rely on manual assembly, and after integration, all welding processes can be centralized. This method is easy to realize the automation and intelligent manufacturing of the electronic expansion valve body to the greatest extent, simplifies the production process of the electronic expansion valve, greatly reduces the proportion of manual operation, and significantly reduces the influence of human factors on product quality.

[0093] The synchronization method of the embodiment is unique and ingenious in design. It not only does not need to sacrifice the reliability of the product to meet the synchronization of the valve body flow, but also has very high synchronization precision, which brings great convenience to the subsequent product performance comprehensive detection link. The precise opening synchronization makes the product performance detection accurate and free of false measurement and false reporting, and the product yield is very high.

[0094] The embodiment has very important significance in the field of electronic expansion valve manufacturing, and provides an optimal solution for the automated manufacturing of the electronic expansion valve body while ensuring the reliability of the electronic expansion valve body.

[0095] Embodiment 4

[0096] On the basis of embodiment 3, the embodiment further introduces the closed point synchronization mechanism assembly in detail.

[0097] The closing point synchronous mechanism assembly of the embodiment includes a valve needle screwing mechanism 21 and a screwing detection mechanism 22. The valve needle screwing mechanism 21 includes a screwing vertical plate 211 fixed on a workbench and a rotating clamp jaw 212 moving up and down relative to the screwing vertical plate 211, and the rotating clamp jaw 212 is fixedly provided with a closing screw rod clamp jaw head 2121 matched with the valve needle 4131 of the electronic expansion valve semi-finished product assembly 4. The rotating clamp jaw 212 is connected with an elastic element fixing seat 214 fixed at the upper end position of the screwing vertical plate 211 through an elastic element 213, and the rotating clamp jaw 212 is also slidingly connected with a floating guide shaft 215 provided with limiting points at both ends, and the upper end of the floating guide shaft 215 is fixedly connected with the driving end of a power element 216. The power element 216 of the embodiment is a mini air cylinder, and the rotating clamp jaw 212 is an electric rotating clamp jaw. The electric rotating clamp jaw is slidingly connected with a linear guide rail 218 fixed on the screwing vertical plate 211 through a sliding block assembly 217, the sliding block assembly 217 is clearance-fitted with the shaft main body 2151 of the floating guide shaft 215 through a guide seat 219, the end of the floating guide shaft 215 is fixedly provided with a guide shaft blocking ring 2152, and the upper end of the floating guide shaft 215 is fixedly provided with a limiting connecting head 2153 fixedly connected with the piston rod 2161 of the mini air cylinder, and the mini air cylinder is fixed on the screwing vertical plate 211 through an air cylinder frame. The elastic element 213 of the embodiment is a tensile spring, the upper end of the tensile spring is connected with a universal joint bolt 2141 fixed on the elastic element fixing seat 214, and the lower end of the tensile spring is connected with a universal joint bolt 2142 fixed on the sliding block assembly 217. The universal joint bolt 2141 and the universal joint bolt 2142 are oppositely arranged. The upper end of a quick connector 222 is connected with a vertical connecting pipe 431 of the electronic expansion valve semi-finished product assembly 4, and the lower end of the quick connector 222 is connected with a flow leak detector through a hose.

[0098] The screwing detection mechanism 22 includes a product connecting seat 221 for bearing the electronic expansion valve semi-finished product assembly 4, and a connector fixing seat 223 arranged below the product connecting seat 221 for fixing the quick connector 222, and the quick connector 222 is used for connecting the electronic expansion valve semi-finished product assembly 4 and the flow leak detector. The electronic expansion valve semi-finished product assembly 4 is placed in the product connecting seat 221 and has no degree of freedom in the circumferential direction, the quick connector 222 is fixed on the connector fixing seat 223, the upper end gas outlet of the quick connector 222 is directly connected with the vertical connecting pipe 431, and the lower end of the quick connector 222 is connected with the flow leak detector through a hose.

[0099] The action process of the closing point synchronization mechanism assembly of the embodiment is as follows: the piston rod 2161 of the power element 216 is fixedly connected with the limiting connector 2153, when the piston rod 2161 is in a retracted state, the elastic element 213 is in a bent state, at this time, the lower end surface of the guide seat 219 is in contact with the upper end surface of the guide shaft stop ring 2152, the piston rod 2161 moves downward, the guide seat 219 does not immediately move downward with the rotary clamp jaw 212, and the guide seat 219 is pushed downward only after the guide seat 219 runs through the stroke of the shaft body 2151 and contacts the limiting connector 2153, and the piston rod 2161 stops moving after moving to a set stroke. At this time, the elastic element 213 is in a stretched state, and the force of the elastic element 213 is greater than the gravity of the rotary clamp jaw 212 and other components; that is, under the action of the elastic element 213, the guide seat 219 is always in contact with the lower end surface of the limiting connector 2153, at this time, the rotary clamp jaw 212 remains stationary, and the closing screw jaw head 2121 of the rotary clamp jaw 212 is tightly clamped around the valve needle 4131 of the electronic expansion valve semi-finished product assembly 4. The lower part of the vertical connecting pipe 431 is provided with a quick connector 222 connected with a flow leak detector, the gas flow released by the flow leak detector enters the quick connector 222, on one hand, the gas flow enters the quick connector 222 through a side path to tightly clamp the vertical connecting pipe 431 by gas pressure, so that the vertical connecting pipe 431 and the quick connector 222 form a tight external connection; on the other hand, the gas flow enters the inside of the vertical connecting pipe 431 through a main path, and is used for the flow leak detector to detect the flow value in the path in real time. After the flow leak detector is connected, the rotary clamp jaw 212 drives the closing screw jaw head 2121 to rotate the valve needle in a forward direction, the valve port gradually becomes smaller, that is, the opening between the valve needle and the valve seat gradually becomes smaller, correspondingly, the flow detected by the flow leak detector will change, when the detected flow value reaches a set threshold value, it is indicated that the opening between the valve needle and the valve seat reaches “zero position”, and the rotary clamp jaw 212 will stop rotating instantaneously. In this way, the openings of the batch-manufactured electronic expansion valve bodies are basically synchronized, and the consistency of the products is very high.

[0100] The product connecting seat 221 and the connector fixing seat 223 of the closing point synchronization mechanism assembly of the embodiment are fixed on the closing slide 2241 of the closing slide cylinder 224, and the closing slide cylinder 224 is fixed on the workbench. Specifically, the product connecting seat 221 and the connector fixing seat 223 are fixedly connected with the closing slide 2241 through the sliding connecting seat 2242. As shown in the coordinate axis, Figure 8 the movement of the closing slide 2241 in the X-axis direction will synchronously drive the product connecting seat 221 and the connector fixing seat 223 to move in the X-axis direction. This design is to change the feeding and discharging position of the product connecting seat 221, so as to avoid the interference between the feeding and discharging mechanical arm and the rotary clamp jaw 212. The structure design is simple, easy to implement, and low in implementation cost.

[0101] In summary, only the preferred embodiment of the present embodiment, not to limit the scope of the present embodiment, the shape, structure, features and spirit of the present embodiment within the scope of the claims of the present embodiment, all equivalent changes and modifications should be included in the scope of the claims of the present embodiment.

Claims

1. A method for manufacturing an electronic expansion valve body, characterized in that, The following steps are included: Step a: Prepare valve seat assembly (43), valve needle assembly (41), magnetic ring assembly (42), sleeve (44), and mounting bracket (45) in advance for use; the valve seat assembly (43) includes valve seat (432), vertical pipe (431), and horizontal pipe (433); the valve needle assembly (41) includes valve needle assembly (413), valve core (414), valve core retaining ring (415), guide spring (416), and stop ring (417); the magnetic ring assembly (42) includes magnetic ring (421), magnetic ring insert (422), and stop rod (423) welded to the magnetic ring insert (422); Step b: Assemble the valve needle assembly (41) and the valve seat assembly (43) together and weld them together to obtain a welded semi-finished product; Step c: Assemble the product of step b with the magnetic ring assembly (42) to obtain the electronic expansion valve semi-finished product assembly (4); Step d: Weld the products from step c together to obtain a two-layer welded semi-finished product; Step e: Weld the product from step d onto the sleeve (44) and mounting bracket (45) in sequence to obtain the electronic expansion valve body; In step a, the stop ring (417) on the valve needle assembly (41) is rotated to a uniform position on the guide spring (416), which is the initial position; After step c and before step d, rotate the valve needle of the electronic expansion valve semi-finished assembly in the forward direction until the flow leak detector determines that the opening between the valve needle (4131) and the valve seat assembly (43) reaches the "zero position" state and stop turning; then operate the magnetic ring angle calibration action, that is, rotate the magnetic ring assembly (42) in the electronic expansion valve semi-finished assembly so that the stop ring (417) on the valve needle assembly (41) is rotated to a new uniform position to reserve the rotation stroke for the pulse-driven valve needle to rotate in the forward direction; After step d, a pulse drive action is performed at any stage during the comprehensive performance test of the electronic expansion valve body, that is, the magnetic ring assembly (42) is driven to rotate according to the set number of pulses, so that the valve needle of the valve needle assembly (41) continues to rotate in the forward direction so that the opening between the valve needle and the valve seat assembly (43) reaches the "locked" state. The "zero position" state is achieved by the closed point synchronization mechanism assembly, which includes a valve needle turning mechanism (21) and a turning detection mechanism (22). The valve needle screwing mechanism (21) includes a screwing plate (211) fixed on the workbench and a rotating gripper (212) that moves up and down relative to the screwing plate (211). The rotating gripper (212) is fixed with a closed screw gripper head (2121) that is compatible with the valve needle (4131) of the electronic expansion valve semi-finished assembly (4). The rotating gripper (212) is connected to the elastic element fixing seat (214) fixed at the upper end of the screwing plate (211) via an elastic element (213). The rotating gripper (212) is also slidably connected to a floating guide shaft (215) with limiting points at both ends. The upper end of the floating guide shaft (215) is fixedly connected to the driving end of the power element (216). The screwing detection mechanism (22) includes a product connector (221) for carrying the electronic expansion valve semi-finished assembly (4) and a connector fixing seat (223) disposed below the product connector (221) for fixing the quick connector (222). The quick connector (222) is used to connect the electronic expansion valve semi-finished assembly (4) and the flow leak detector.

2. The method for manufacturing an electronic expansion valve body according to claim 1, characterized in that... The pulse-driven action is performed as a preliminary step in the comprehensive performance test of the electronic expansion valve body.

3. The method for manufacturing an electronic expansion valve body according to claim 2, characterized in that: The initial position of the stop ring (417) on the valve needle assembly (41) in step a on the guide spring (416) is the lower limit.

4. The method for manufacturing an electronic expansion valve body according to claim 1, characterized in that: The power element (216) is a miniature cylinder; the rotating gripper (212) is an electric rotating gripper; The electric rotary gripper is slidably connected to the linear guide rail (218) fixed on the screw plate (211) via the slider assembly (217). The slider assembly (217) is clearance-fitted with the shaft body (2151) of the floating guide shaft (215) via the guide seat (219). The end of the floating guide shaft (215) is fixedly provided with a guide shaft retaining ring (2152), and the upper end of the floating guide shaft (215) is fixedly provided with a limiting connector (2153). The limiting connector (2153) is fixedly connected to the piston rod (2161) of the mini cylinder.

5. The method for manufacturing an electronic expansion valve body according to claim 1, characterized in that: The elastic element (213) is a tension spring. The upper end of the tension spring is connected to a hinge bolt (2141) fixed on the elastic element fixing seat (214), and the lower end of the tension spring is connected to a hinge bolt (2142) fixed on the slider assembly (217).

6. The method for manufacturing an electronic expansion valve body according to claim 1, characterized in that: The upper end of the quick connector (222) is connected to the vertical pipe (431) (412) of the electronic expansion valve semi-finished assembly (4), and the lower end of the quick connector (222) is connected to the flow leak detector through a hose.

7. The method for manufacturing an electronic expansion valve body according to claim 1, characterized in that: The magnetic ring angle calibration action is achieved by the magnetic ring angle calibration mechanism assembly; The magnetic ring angle calibration mechanism assembly includes a valve needle clamping mechanism (31) and a magnetic ring driving mechanism (32). The valve needle clamping mechanism (31) includes a calibration slide cylinder (311) fixed on the worktable and reciprocating in the X-axis direction. A calibration finger cylinder (312) is fixed on the calibration slide (3111) of the calibration slide cylinder (311). A calibration screw clamp head (3121) that stabilizes the valve needle (4131) is fixed at the clamping end of the calibration finger cylinder (312). The magnetic ring drive mechanism (32) includes a rubber-coated wheel (321) that reciprocates in the X-axis direction. The rubber-coated wheel (321) drives the magnetic ring assembly (42) to rotate under the action of the rotary drive mechanism (322).

8. The method for manufacturing an electronic expansion valve body according to claim 7, characterized in that: The rotary drive mechanism (322) is a servo motor. The rotary drive mechanism (322) is connected to the sliding mechanism set on the worktable via the motor mounting base (323). The sliding mechanism is a structure in which a ball screw and a linear slide rail (325) cooperate. It includes a slider (324) fixedly connected to the motor mounting base (323). The slider (324) moves along the linear slide rail (325), and the nut seat on the slider (324) is threadedly connected to the ball screw. The ball screw is driven by the linear drive mechanism (326).

Images