Double-valve-needle large-diameter electronic expansion valve

Abstract

The utility model discloses a double-valve-needle large-diameter electronic expansion valve which comprises a lower valve seat, a connecting seat, a guide sleeve, a valve element, a valve rod and a driving mechanism. A large valve port is formed in the lower valve seat; the connecting seat is fixedly connected to the upper end of the lower valve seat; the guide sleeve is fixed at the upper end of the connecting seat; the valve element is movably matched in the connecting base in the axial direction, a valve element spring is arranged between the lower end of the guide sleeve and the upper end of the valve element, an axial channel, a small valve port and a radial channel are formed in the valve element, a guide cavity is formed in the upper portion of the valve element, and a bearing is arranged at the position, close to the upper end, in the guide cavity. The valve rod is in threaded fit with the guide sleeve, the lower end of the valve rod penetrates through the bearing and is provided with a limiting guide piece matched with the interior of the guide cavity, and the lower end of the valve rod is further provided with a valve needle stretching into the axial channel. The driving mechanism is used for driving the valve rod to rotate. According to the utility model, the problems of clamping stagnation and large required driving force in the action process caused by resistance generated when the valve core and the valve rod part move up and down are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic expansion valve technical field, specifically related to a double valve needle big aperture electronic expansion valve. BACKGROUND

[0002] At present, electronic expansion valves are usually used to adjust the flow of fluid in various refrigeration and heating equipment on the market. An electronic expansion valve is usually composed of a valve seat component and a driving assembly, and the valve seat component includes a valve rod component, a guide sleeve component, a connecting seat, a lower valve seat, a valve core component, a small valve needle, a sealing block, a magnetic rotor component, etc. The guide sleeve component, the connecting seat and the lower valve seat are fixedly connected, the lower valve seat has a valve port on the valve core, the magnetic rotor component is fixedly connected with the valve rod component, the valve rod component is threadedly connected with the guide sleeve component, the coil drives the magnetic rotor component to rotate, the valve rod component rotates synchronously with the magnetic rotor component, and the valve rod component moves up and down to adjust the opening of the valve port and realize flow adjustment and on-off control.

[0003] However, the resistance generated when the valve core and the valve rod component move up and down may cause problems such as jamming and large driving force required during the movement. SUMMARY

[0004] In view of the defects in the prior art, the utility model provides a double valve needle big aperture electronic expansion valve to solve the problem that the resistance generated when the valve core and the valve rod component move up and down causes problems such as jamming and large driving force required during the movement.

[0005] The utility model provides a double valve needle big aperture electronic expansion valve, which comprises:

[0006] A lower valve seat is provided with a first channel, a second channel and a large valve port between the first channel and the second channel;

[0007] A connecting seat is fixedly connected to the upper end of the lower valve seat;

[0008] A guide sleeve is fixed to the upper end of the connecting seat;

[0009] A valve core is movably fitted in the connecting seat in the axial direction and can open or block the large valve port. A valve core spring is arranged between the lower end of the guide sleeve and the upper end of the valve core. An axial channel is arranged in the valve core in the axial direction. A small valve port is arranged near the lower end of the axial channel. A radial channel is arranged in the valve core in the radial direction and communicates with the first channel and the axial channel. A guide cavity is arranged in the upper part of the valve core. A bearing is arranged in the guide cavity near the upper end.

[0010] A valve stem, an upper end of the valve stem is screwed into the guide sleeve, a lower end of the valve stem is screwed out of the bearing and is provided with a limiting guide adapted to the guide cavity, the lower end of the valve stem is further provided with a valve needle extending into the axial channel and capable of opening or blocking the small valve port;

[0011] A driving mechanism for driving the valve stem to rotate.

[0012] Further, the first channel is arranged at the upper part of the lower valve seat, a plurality of communication holes are arranged on the peripheral wall of the lower valve seat and communicate between the inside and outside of the first channel, the second channel is arranged at the lower part of the lower valve seat, an annular step is arranged at the large valve port between the first channel and the second channel and faces upward, and an annular sealing block is arranged on the annular step.

[0013] Further, the bearing comprises an outer ring and an inner ring arranged concentrically and a plurality of rolling balls arranged between the outer ring and the inner ring, the outer ring is fixed in the guide cavity, and the lower end of the inner ring is used to contact the limiting guide.

[0014] Further, an annular groove is arranged on the inner wall of the upper end of the guide cavity, the outer ring of the bearing is positioned in the annular groove, and a fixing ring is fixed on the upper end of the outer ring of the bearing and is pressed against the outer ring.

[0015] Further, a positioning convex ring is arranged on the upper side of the fixing ring, the lower end of the valve core spring is sleeved outside the positioning convex ring and is supported on the fixing ring.

[0016] Further, a guide hole groove is arranged on the lower end of the valve stem in the axial direction, the upper end of the valve needle is slidably adapted to and limited in the guide hole groove, and a valve needle spring is arranged between the top of the guide hole groove and the valve needle.

[0017] Further, a boss part is arranged on the outer periphery of the upper part of the valve needle, and a valve needle sleeve is arranged on the bottom of the guide hole groove and is used to limit the boss part in the guide hole groove and allow the valve needle to pass through.

[0018] Further, the driving mechanism comprises a sleeve, a magnetic rotor component and a coil winding;

[0019] The sleeve is fixed on the upper end of the lower valve seat;

[0020] The magnetic rotor component is rotatably adapted to the sleeve, and the magnetic rotor component is fixedly connected with the upper end of the valve stem;

[0021] The coil winding is arranged outside the sleeve.

[0022] Further, the valve core is provided with a first flow channel communicating the large valve port and the bottom of the guide cavity, the side wall of the upper part of the guide hole groove is provided with a second flow channel communicating the connecting seat inner cavity and the guide hole groove, and the guide sleeve is provided with a third flow channel communicating the sleeve and the connecting seat inner cavity.

[0023] Further, the limiting guide is a ring-shaped member adapted to the guide cavity, and the outer edge of the ring-shaped member is provided with a plurality of notches, so that the over-flow passage is formed between the ring-shaped member and the inner wall of the guide cavity.

[0024] The beneficial effects of the utility model are reflected in:

[0025] The valve rod is threadedly connected with the guide sleeve, and when the valve rod is rotated, the valve rod can be driven to move axially.

[0026] When the valve opening action is performed, the valve rod is driven to move upward, the valve needle is driven to move upward to open the small valve port, at this time, the first channel and the second channel are communicated through the axial channel and the radial channel in the valve core, small flow opening is realized, and the valve rod continues to move upward, the limiting guide on the outer periphery of the lower end of the valve rod abuts against the bearing, the valve core is driven to move upward to open the large valve port, at this time, the first channel and the second channel are communicated through the large valve port, large flow opening is realized.

[0027] When the valve closing action is performed, the valve rod is driven to move downward, the valve core moves downward together with the valve rod under the action of the valve core spring, when the valve core abuts against the sealing surface of the large valve port, the large valve port is closed, the valve rod drives the valve needle to continue to move downward, when the valve needle abuts against the sealing surface of the small valve port in the valve core, the small valve port is closed.

[0028] The utility model sets the bearing on the upper part of the guide cavity of the valve core, when the valve rod moves upward to open the valve, the limiting guide on the outer periphery of the lower end of the valve rod abuts against the bearing, so that the frictional resistance between the valve rod and the valve core when the valve rod rotates can be reduced, the problem that the resistance between the valve core and the valve rod parts when the valve core and the valve rod parts move upward and downward causes the valve rod to be stuck and the driving force required to be large in the movement process can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally indicated by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0030] Figure 1 The sectional view of the valve closing state of the utility model embodiment

[0031] Figure 2 The sectional view of the valve opening state of the utility model embodiment

[0032] Figure 3 It is the sectional view of the valve core and the valve rod combination of the utility model embodiment;

[0033] Figure 4 It is the explosion view of the valve core of the utility model embodiment;

[0034] Figure 5 It is the perspective view of the valve rod of the utility model embodiment.

[0035] Reference signs:

[0036] 100 - lower valve seat;110 - first channel;111 - communication hole;120 - second channel;130 - large valve port;140 - annular sealing block;200 - connecting seat;300 - guide sleeve;310 - third flow passage;400 - valve core;410 - valve core spring;420 - axial passage;430 - small valve port;440 - radial passage;450 - guide cavity;451 - annular groove;460 - bearing;461 - outer ring;462 - inner ring;463 - ball;470 - fixed ring;471 - positioning convex ring;480 - first flow passage;500 - valve rod;510 - limiting guide;511 - notch;520 - valve needle;530 - guide hole groove;531 - second flow passage;540 - valve needle spring;550 - boss part;560 - valve needle sleeve;600 - driving mechanism;610 - sleeve;620 - magnetic rotor component. DETAILED DESCRIPTION

[0037] The embodiments of the technical scheme of the utility model will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, therefore only as an example, and cannot limit the protection scope of the utility model.

[0038] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be the usual meaning understood by the technical personnel in the field of the utility model.

[0039] As Figures 1-5 shown, the utility model embodiment provides a kind of double valve needle large-caliber electronic expansion valve, including lower valve seat 100, connecting seat 200, guide sleeve 300, valve core 400, valve rod 500 and driving mechanism 600.

[0040] First channel 110, second channel 120 and large valve port 130 between first channel 110 and second channel 120 are arranged in lower valve seat 100.

[0041] Connecting seat 200 is fixedly connected to the upper end of lower valve seat 100.

[0042] Guide sleeve 300 is fixed to the upper end of connecting seat 200.

[0043] The valve core 400 is adapted to the connection seat 200 in the axial direction and can open or close the large valve port 130. The lower end of the guide sleeve 300 is provided with a valve core spring 410 between the upper end of the valve core 400. The valve core 400 is provided with an axial channel 420 in the axial direction. The small valve port 430 is provided near the lower end of the axial channel 420. The valve core 400 is provided with a radial channel 440 in the radial direction, which communicates with the first channel 110 and the axial channel 420. The upper part of the valve core 400 is provided with a guide cavity 450. The guide cavity 450 is provided with a bearing 460 near the upper end.

[0044] The upper end of the valve rod 500 passes through the guide sleeve 300 and is screwed with the guide sleeve 300. The lower end of the valve rod 500 passes through the bearing 460 and is provided with a limiting guide 510 adapted to the guide cavity 450. The lower end of the valve rod 500 is also provided with a valve needle 520 which extends into the axial channel 420 and can open or close the small valve port 430.

[0045] The driving mechanism 600 is used to drive the valve rod 500 to rotate.

[0046] The valve rod 500 of the present application is screwed with the guide sleeve 300. When the valve rod 500 is rotated, it can drive the valve rod 500 to move axially.

[0047] When the valve opening action is performed, the valve rod 500 moves upward, driving the valve needle 520 to move upward to open the small valve port 430. At this time, the first channel 110 and the second channel 120 are connected through the axial channel 420 and the radial channel 440 in the valve core 400, realizing small flow opening. The valve rod 500 continues to move upward. When the limiting guide 510 on the outer periphery of the lower end of the valve rod 500 is in contact with the bearing 460, the valve core 400 is driven to move upward to open the large valve port 130. At this time, the first channel 110 and the second channel 120 are connected through the large valve port 130, realizing large flow opening.

[0048] When the valve closing action is performed, the valve rod 500 moves downward. The valve core 400 moves downward together with the valve rod 500 under the action of the valve core spring 410. When the valve core 400 is in contact with the sealing surface of the large valve port 130, the large valve port 130 is closed. The valve rod 500 drives the valve needle 520 to continue to move downward. When the valve needle 520 is in contact with the sealing surface of the small valve port 430 in the valve core 400, the small valve port 430 is closed.

[0049] The present application sets the bearing 460 on the upper part of the guide cavity 450 of the valve core 400. When the valve rod 500 moves upward to open the valve, the limiting guide 510 on the outer periphery of the lower end of the valve rod 500 will be in contact with the bearing 460. This can reduce the frictional resistance between the valve rod 500 and the valve core 400 when the valve rod 500 rotates, thereby solving the problem that the resistance between the valve core 400 and the valve rod 500 components when moving up and down causes jamming and large driving force during the action.

[0050] In some embodiments, referring to Figure 1 and Figure 2 , the first channel 110 is arranged at the upper part of the lower valve seat 100, the circumferential wall of the lower valve seat 100 is provided with a plurality of communication holes 111 which communicate the inside and outside of the first channel 110, the second channel 120 is arranged at the lower part of the lower valve seat 100, a ring-shaped step which faces upward is arranged at the large valve port 130 between the first channel 110 and the second channel 120, a ring-shaped sealing block 140 is arranged on the ring-shaped step, and the valve core 400 contacts the ring-shaped sealing block 140 when it blocks the large valve port 130, so that the sealing performance can be improved.

[0051] In some embodiments, referring to Figure 3 and Figure 4 , the bearing 460 includes an outer ring 461 and an inner ring 462 which are concentrically arranged, and a plurality of rolling balls 463 which are arranged between the outer ring 461 and the inner ring 462, the outer ring 461 is fixed in the guide cavity 450, and the lower end of the inner ring 462 is used to contact the limiting guide 510. The outer ring 461 of the above-mentioned bearing 460 is fixed, the inner ring 462 is rotatable, and when the limiting guide 510 of the lower end of the valve rod 500 abuts against the lower end of the inner ring 462 of the bearing 460, the inner ring 462 will rotate together with the valve rod 500, so that the resistance of the rotation of the valve rod 500 can be reduced.

[0052] Preferably, in order to facilitate the installation and fixation of the bearing 460, the inner wall of the upper end of the guide cavity 450 is provided with a ring-shaped groove 451, the outer ring 461 of the bearing 460 is positioned in the ring-shaped groove 451, and the upper end of the ring-shaped groove 451 is fixed with a fixing ring 470 which is pressed against the upper end of the outer ring 461 of the bearing 460.

[0053] More preferably, in order to be able to position the lower end of the valve core spring 410, the upper side of the fixing ring 470 is provided with a positioning convex ring 471, the lower end of the valve core spring 410 is sleeved outside the positioning convex ring 471 and supported on the fixing ring 470.

[0054] In order to prevent the fixing ring 470 from being pressed against the inner ring 462 of the bearing 460 and causing the resistance of the rotation of the inner ring 462 of the bearing 460 to increase, the lower end of the fixing ring 470 is chamfered along the inner periphery to avoid the inner ring 462 of the bearing 460.

[0055] It can be understood that, in other embodiments, the bearing 460 can also be a plain bearing 460.

[0056] In some embodiments, referring to Figure 3The lower end of the valve stem 500 is provided with a guide hole groove 530 in the axial direction, the upper end of the valve needle 520 is slidingly fitted and limited in the guide hole groove 530, the top of the guide hole groove 530 is provided with the valve needle spring 540 between the valve needle 520, and the valve needle spring 540 can provide buffering for the valve needle 520 when the small valve port 430 is closed.

[0057] In order to ensure that the valve needle 520 can slide in the axial direction in the guide hole groove 530 and not be separated from the guide hole groove 530, the upper portion of the valve needle 520 is provided with a boss portion 550, and the bottom of the guide hole groove 530 is provided with a valve needle sleeve 560 for limiting the boss portion 550 in the guide hole groove 530 and for the valve needle 520 to pass through.

[0058] In some embodiments, the driving mechanism 600 includes a sleeve 610, a magnetic rotor component 620, and a coil winding (not shown in the figure). The sleeve 610 is fixed to the upper end of the lower valve seat 100. The magnetic rotor component 620 is rotationally fitted in the sleeve 610, and the magnetic rotor component 620 is fixedly connected to the upper end of the valve stem 500. The coil winding is provided outside the sleeve 610.

[0059] When the coil winding is energized, it will drive the magnetic rotor component 620 to rotate, and the rotation of the magnetic rotor component 620 will drive the valve stem 500 to rotate together. Under the action of the threaded cooperation, the valve stem 500 rotates relative to the guide sleeve 300 while realizing axial movement, thereby realizing the driving of the axial movement of the valve stem 500.

[0060] In addition, the valve core 400 is provided with a first flow channel 480 that communicates the large valve port 130 and the bottom of the guide cavity 450, the sidewall of the upper portion of the guide hole groove 530 is provided with a second flow channel 531 that communicates the inner cavity of the connecting seat 200 and the guide hole groove 530, and the guide sleeve 300 is provided with a third flow channel 310 that communicates the sleeve 610 and the inner cavity of the connecting seat 200.

[0061] By providing the first flow channel 480, the second flow channel 531, and the third flow channel 310, the inner cavities of the lower valve seat 100, the connecting seat 200, the guide hole groove 530 of the valve stem 500, and the inner cavity of the sleeve 610 can be communicated, so that the pressure balance between the chambers is realized. In this way, the valve core 400 and the valve needle 520 will not be affected by the pressure difference during the up-and-down movement of opening and closing the valve, thereby avoiding the problem of large pressure difference between the chambers and large opening and closing valve performance error.

[0062] Preferably, with reference to Figure 5 The limiting guide 510 is a ring-shaped member that is fitted in the guide cavity 450, and the outer edge of the ring-shaped member is provided with a plurality of notches 511, so that a flow passage is formed between the ring-shaped member and the inner wall of the guide cavity 450. By providing notches 511 on the outer edge of the ring-shaped member, it is beneficial for the fluid to pass between the ring-shaped member and the guide cavity 450, and further ensures pressure balance.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A dual valve needle large bore electronic expansion valve characterized by, The application relates to a double-valve-needle large-diameter electronic expansion valve. The lower valve seat is internally provided with a first channel, a second channel and a large valve port between the first channel and the second channel; the connecting seat is fixedly connected to the upper end of the lower valve seat; the guide sleeve is fixed to the upper end of the connecting seat; the valve core is movably fitted in the connecting seat in the axial direction and can open or block the large valve port; the lower end of the guide sleeve and the upper end of the valve core are provided with a valve core spring; the axial channel is arranged in the valve core in the axial direction; the small valve port is arranged near the lower end of the axial channel; the radial channel is arranged in the valve core in the radial direction and is communicated with the first channel and the axial channel; the upper part of the valve core is provided with a guide cavity; the bearing is arranged in the guide cavity near the upper end; the upper end of the valve rod is screwed with the guide sleeve; the lower end of the valve rod passes through the bearing and is provided with the limiting guide element fitted in the guide cavity; the lower end of the valve rod is further provided with the valve needle which extends into the axial channel and can open or block the small valve port; and the driving mechanism is used for driving the valve rod to rotate.

2. The double-valve-needle large-diameter electronic expansion valve according to claim 1, wherein the first channel is arranged in the upper part of the lower valve seat; the circumferential wall of the lower valve seat is provided with a plurality of communication holes which are communicated between the inside and outside of the first channel; the second channel is arranged in the lower part of the lower valve seat; the annular step is arranged on the ring-shaped sealing block on the annular step of the large valve port between the first channel and the second channel and faces the upper side.

3. The double-valve-needle large-diameter electronic expansion valve according to claim 1, wherein the bearing comprises the outer ring and the inner ring which are concentrically arranged and the rolling balls which are arranged between the outer ring and the inner ring; the outer ring is fixed in the guide cavity; and the lower side end of the inner ring is used for contacting the limiting guide element.

4. The double-valve-needle large-diameter electronic expansion valve according to claim 3, wherein the inner wall of the upper end of the guide cavity is provided with the annular groove; the outer ring of the bearing is positioned in the annular groove; and the fixed ring is fixed on the upper end of the outer ring of the bearing.

5. The double-valve-needle large-diameter electronic expansion valve according to claim 4, wherein the upper side of the fixed ring is provided with the positioning convex ring; the lower end of the valve core spring is sleeved on the outside of the positioning convex ring and is supported on the fixed ring.

6. The double-valve-needle large-diameter electronic expansion valve according to claim 1, wherein the lower end of the valve rod is provided with the guide hole groove in the axial direction; the upper end of the valve needle is slidably fitted in the guide hole groove and is limited in the guide hole groove; and the valve needle spring is arranged between the top of the guide hole groove and the valve needle.

7. The double-valve-needle large-diameter electronic expansion valve according to claim 6, wherein the upper part of the outer periphery of the valve needle is provided with the boss part; and the bottom of the guide hole groove is provided with the valve needle sleeve which is used for limiting the boss part in the guide hole groove and is passed through by the valve needle.

8. The double-valve-needle large-diameter electronic expansion valve according to claim 6, wherein the driving mechanism comprises the sleeve, the magnetic rotor component and the coil winding; and the sleeve is fixed on the upper end of the lower valve seat. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The magnetic rotor component is adapted to rotate within the sleeve, and is fixedly connected with the upper end of the valve stem; The coil winding is disposed outside the sleeve.

9. The dual-valve needle large-bore electronic expansion valve according to claim 8, characterized in that, The valve core is provided with a first flow channel communicating the large valve port and the bottom of the guide cavity, the side wall of the upper part of the guide hole groove is provided with a second flow channel communicating the inner cavity of the connecting seat and the guide hole groove, and the guide sleeve is provided with a third flow channel communicating the sleeve and the inner cavity of the connecting seat.

10. The dual-valve needle large-bore electronic expansion valve according to claim 9, characterized in that, The limiting guide is a ring-shaped member adapted to the guide cavity, and the outer edge of the ring-shaped member is provided with a plurality of notches, so that the ring-shaped member and the inner wall of the guide cavity form a flow passage.

Images