CN113188275A - Electronic expansion valve capable of preventing thread from being stuck - Google Patents
Electronic expansion valve capable of preventing thread from being stuck Download PDFInfo
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- CN113188275A CN113188275A CN202110453756.1A CN202110453756A CN113188275A CN 113188275 A CN113188275 A CN 113188275A CN 202110453756 A CN202110453756 A CN 202110453756A CN 113188275 A CN113188275 A CN 113188275A
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Abstract
The invention discloses an electronic expansion valve capable of preventing thread from being stuck, which comprises a shell, a stator assembly arranged in the shell and a valve seat arranged at the lower end of the shell, wherein a rotor assembly is arranged in the stator assembly, a magnetism isolating pipe is sleeved outside the rotor assembly, a valve rod connected with the rotor assembly is arranged in the center of the valve seat, a valve needle assembly is arranged at the lower part of the valve seat, a screw rod part at the lower end of the valve rod is in threaded connection with a valve needle assembly, a valve base is arranged at the lower end of the valve seat, a valve port corresponding to the valve needle assembly is arranged on the valve base, the electronic expansion valve further comprises an anti-sticking assembly, the anti-sticking assembly is positioned in the magnetism isolating pipe and comprises a main support and a spiral guide rail sleeved outside the main support, a. The novel anti-thread-jamming structure is adopted, so that the service life is long, the structural integration level is high, the number of parts is small, the assembly is more convenient, the light weight is facilitated, and the cost is more advantageous.
Description
Technical Field
The invention relates to the field of expansion valves, in particular to an electronic expansion valve capable of preventing thread from being stuck.
Background
Energy conservation and emission reduction are problems to be solved urgently by people nowadays. The throttling device plays a key role in the refrigeration system, and the energy consumption of the whole refrigeration system can be reduced by selecting a proper throttling mechanism to be matched with the refrigeration system. The working principle of throttling is that when the refrigerant flows through the valve, the flow section is suddenly contracted, the flow speed of the fluid is accelerated, and the pressure is reduced, so that the functions of regulating the flow, controlling the degree of superheat and evaporating the liquid level are achieved. Therefore, the flow regulation of the throttling mechanism plays an important role in saving energy and reducing consumption of the refrigerating device. On some occasions with severe load change or wide operation condition range, the traditional throttling elements (such as capillary tubes, thermal expansion valves and the like) cannot meet the requirements on comfort and energy conservation. The temperature sensing package of the thermostatic expansion valve has obvious delay characteristic, and is difficult to cooperate with the displacement of the compressor to make quick and effective reaction to the flow change, finally resulting in the oscillation of system regulation, causing the unstable operation of the machine, even damaging the compressor network, so the electronic expansion valve is gradually replacing the traditional throttling element. The electronic expansion valve is superior to the traditional throttling mechanism in superheat degree control (liquid level control) and flow regulation, and has the advantages of higher reaction speed, wider regulation range, more obvious energy-saving effect and wide application prospect.
Because the pressure difference between the high pressure and the low pressure at the two sides of the inlet and the outlet of the electronic expansion valve of the refrigerant system is larger, the pressure difference acts on the valve needle of the electronic expansion valve, so that the action resistance of the valve needle is increased, when the electronic expansion valve needs to be opened again after being closed, the valve needle can open the refrigerant channel only by overcoming the larger pressure difference resistance, the valve needle is not easy to open, if a motor with larger torque is adopted to overcome the resistance, the coil volume of the electronic expansion valve can be relatively increased, the control precision is reduced, the installation is limited by space, the power consumption of the system is larger, and the cost is increased.
In addition, in the process of closing the valve of the expansion valve, the valve needle stops suddenly when encountering a lower stroke limit, so that a large inertia force is generated, threads are combined, the axial force of a part structure is too large, and the valve cannot be opened, so that the conventional expansion valve needs to be improved.
Disclosure of Invention
The electronic expansion valve capable of preventing the thread from being stuck adopts a novel thread sticking prevention structure, is long in service life, high in structural integration level, few in parts, more convenient to assemble, beneficial to light weight and more advantageous in cost.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a can prevent dead electronic expansion valve of screw thread card, includes the shell, sets up stator module in the shell and sets up the disk seat at the shell lower extreme, stator module's internally mounted have the rotor subassembly, the outside of rotor subassembly cup jointed the magnetism proof pipe, the center of disk seat install the valve rod that links to each other with the rotor subassembly, the lower part of disk seat install the valve needle subassembly, the silk pole portion and the valve needle subassembly threaded connection of valve rod lower extreme, the lower extreme of disk seat install the valve base, the valve base on be provided with the valve port that corresponds with the valve needle subassembly, its characterized in that still includes:
the anti-blocking component is located inside the magnetism isolating pipe and comprises a main support and a spiral guide rail sleeved on the outer side of the main support, a spiral sliding ring is arranged on the spiral guide rail, and a shifting portion for driving the sliding ring to move is arranged on the rotor component.
The valve needle assembly is provided with a balance flow channel corresponding to the valve port, and the balance flow channel is communicated with the upper cavity of the valve seat.
Preferably, the main bracket comprises a shaft part and a positioning disc positioned at the upper end of the shaft part, and the positioning disc is connected with the magnetism isolating pipe.
Preferably, a plurality of positioning grooves are formed in the side wall of the outer side of the positioning plate, and riveting portions correspondingly matched with the positioning grooves are arranged on the outer surface of the magnetism isolating pipe.
Preferably, the upper part of the shaft part is provided with a circle of circular truncated cone, an annular groove is formed between the circular truncated cone and the positioning disc, and the clamping part at the upper end of the spiral guide rail is fixedly clamped in the annular groove.
Preferably, the middle part of the valve rod is connected with the valve seat through a bearing, and the upper part of the valve rod is a positioning inserted rod which is axially inserted into the shaft rod part of the main bracket.
Preferably, the valve needle assembly comprises a valve needle and an inner nut arranged inside the valve needle, the inner nut is connected with the screw rod, the upper end of the valve needle is provided with a stop ring, the stop ring is embedded with the valve needle, and the lower end of the stop ring is connected with the inner nut.
Preferably, the two sides of the stop ring are provided with embedded blocks, the embedded blocks are embedded into the embedded grooves on the two sides of the end part of the valve needle, and a gap is reserved between the stop ring and the valve needle.
Preferably, an elastic part is arranged between the lower end of the inner nut and the valve needle.
As preferred, the hole both sides of disk seat be provided with spacing plane, spacing plane and needle lateral wall on the plane paste mutually, the bottom of disk seat from top to bottom set gradually first step face and second step face, first step face in install the sealing washer, the inner circle of sealing washer install main sealing ring, second step face in be equipped with main sealing ring and the spacing clamping ring of sealing washer.
Preferably, the shifting part is a vertical rod arranged in the rotor assembly, the lower end of the sliding ring is provided with a bending part, and the vertical rod is abutted to the bending part.
Compared with the prior art, the invention has the beneficial effects that:
1. the rotor assembly adopts the design of sliding ring and spring guide rail, makes the valve have the protection of spacing from top to bottom when crossing the switch, prevents that the valve from dying when last lower dead center.
2. The electronic expansion valve is provided with the magnetism isolating pipe and the dynamic seal, fluid media can enter the upper cavity of the valve body through the position of the valve needle, the fluid media can fill the upper cavity of the whole valve seat assembly, and the fluid media cannot leak, so that the pressure difference between the upper side and the lower side of the valve needle is reduced, the movement resistance of the valve needle is reduced, the low-pressure section is maintained at a fluid outlet, the pressure balance of the upper end and the lower end of the valve needle of the electronic expansion valve is facilitated, and the energy consumption is reduced.
3. The structure integrated level is high, and the part is few, and the equipment is more convenient, is favorable to the lightweight, and the cost is more advantageous.
Drawings
FIG. 1 is a perspective exploded view of the present invention;
FIG. 2 is a partial half sectional view of a first construction of the invention;
FIG. 3 is a partial half sectional view of a second construction of the invention;
FIG. 4 is a perspective view of the anti-seize assembly of the present invention;
FIG. 5 is an external structural view of a magnetism isolating tube according to the present invention;
FIG. 6 is a view of the installation of the anti-seize assembly of the present invention;
FIG. 7 is a detailed block diagram of the anti-seize assembly of the present invention;
FIG. 8 is a half sectional view of a rotor assembly of the present invention;
FIG. 9 is a half sectional view of the valve seat of the present invention;
FIG. 10 is a top view block diagram of the valve seat of the present invention;
figure 11 is a perspective block diagram of the valve pin assembly of the present invention;
figure 12 is a half-section block diagram of the valve needle assembly of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-12, the present invention provides an electronic expansion valve capable of preventing thread from being locked, which includes a housing 1, a stator assembly 2 disposed in the housing 1, and a valve seat 8 disposed at a lower end of the housing 1, wherein the housing 1 is an injection molded part and is injection molded from a plastic material, in order to protect the stator assembly, the stator assembly 2 is encapsulated, and the encapsulating material outside the stator assembly 2 is TSG-30/4W.
The stator module 2 internally mounted have rotor subassembly 6, the outside of rotor subassembly 6 cup jointed at magnetism isolating pipe 4, magnetism isolating pipe 4 is made by SUS304 deep drawing, the center of disk seat 8 install with rotor subassembly 6 continuous valve rod 7, the lower part of disk seat 8 install needle subassembly 9, wire rod portion 71 and the needle subassembly 9 threaded connection of valve rod 7 lower extreme, the lower extreme of disk seat 8 install valve base 10, valve base 10 on be provided with the valve port that corresponds with needle subassembly 9, still include:
the anti-blocking component 5 is positioned inside the magnetism isolating pipe 4, the anti-blocking component 5 comprises a main support 50 and a spiral guide rail 59 sleeved outside the main support 50, the main support 50 can be an injection molding part made of PEEK, the PEEK material is good in self-lubricating property, wear resistance and mechanical property, the top end of the main support 50 and the inside of the magnetism isolating pipe 4 are subjected to profiling treatment to play a role in fixed guide compensation and better guarantee the coaxiality of assembled sample pieces, the spiral guide rail 59 is provided with a spiral sliding ring 56, the rotor component 6 is provided with a shifting part 61 for driving the sliding ring 56 to move, the rotor component 6 and the valve rod 7 can drive the sliding ring 56 to perform spiral sliding when rotating and lift along the main support 50, when the upper end face of the sliding ring 56 is in contact with the spiral guide rail 59, the valve needle component 9 is positioned at the lowest end at the moment, the opening degree of the valve port is minimum, and no liquid passes through the valve; when the lower end of the sliding ring 56 is contacted with the lower end of the spiral guide rail 59, the valve needle assembly 9 is positioned at the uppermost end, the opening degree of the valve port is the largest, the flow of liquid passing through the valve is the largest, and the sliding ring 56 reaches the moving limit position before threads are combined to be dead, so that the situation that the threads between the valve needle assembly 9 and the valve rod 7 are combined to be dead can be effectively avoided.
The toggle part 61 is a vertical rod arranged inside the rotor assembly 6, the lower end of the sliding ring 56 is provided with a bending part 52, and the vertical rod is abutted against the bending part 52.
The valve needle assembly 9 is provided with a balance flow passage 92 corresponding to the valve port, and the balance flow passage 92 is communicated with the upper cavity of the valve seat 8.
The main bracket 50 comprises a shaft rod part 55 and a positioning disc 53 positioned at the upper end of the shaft rod part 55, the positioning disc 53 is connected with the magnetism isolating pipe 4, a plurality of positioning grooves 51 are arranged on the side wall of the outer side of the positioning disc 53, riveting parts 41 correspondingly matched with the positioning grooves 51 are arranged on the outer surface of the magnetism isolating pipe 4, the main bracket 50 can be prevented from rotating, and a small groove is formed in the lower end of the shaft rod part 55 and used for preventing positioning errors during assembly.
The upper portion of the shaft rod portion 55 is provided with a circle of round platform 54, an annular groove 58 is formed between the round platform 54 and the positioning disc 53, an upper end clamping portion 57 of the spiral guide rail 59 is fixedly clamped in the annular groove 58, and the upper portion of the spiral guide rail 59 is clamped in the annular groove 58 for fixing.
The middle part of the valve rod 7 is connected with the valve seat 8 through the bearing 11, the upper part of the valve rod 7 is a positioning inserted rod 72 which is axially inserted into the shaft rod part 55 of the main bracket 50, and the main bracket 50 can guide the rotation of the valve rod 7 to play the same role as the bearing.
The valve needle assembly 9 comprises a valve needle 93 and an inner nut 91 arranged inside the valve needle 93, the inner nut 91 is connected with the screw rod part 71, the upper end of the valve needle 93 is provided with a stop ring 12, the stop ring 12 is embedded with the valve needle 93, the lower end of the stop ring is connected with the inner nut 91, the stop ring 12 is made of stainless steel, the lower part of the stop ring is provided with two pins which are used for being matched with two grooves in the inner nut 91, so that the inner nut 91 cannot rotate greatly inside the valve needle 93 and can only move axially in a limited space.
In order to prevent the stop ring 12 from rotating, the two sides of the stop ring 12 are provided with the insertion blocks 121, the insertion blocks 121 are inserted into the insertion grooves 95 at the two sides of the end part of the valve needle 93, a gap 122 is left between the stop ring 12 and the valve needle 93, the elastic element 94 is installed between the lower end of the inner nut 91 and the valve needle 93, the elastic element 94 can make a disc spring or a spring (as shown in fig. 3) play a role of buffering, and the valve needle 93 is prevented from suddenly stopping when meeting a lower stroke limit during valve closing movement to generate large inertia force to lead threads to be dead, so that the axial force of the part structure is too large, the situation that the valve cannot be opened is generated, meanwhile, the sealing between the valve needle 93 and the valve seat 8 is ensured, and the valve opening force required during valve opening is also reduced. As shown in fig. 2, when the elastic member 94 is a disc spring, the lower end surface of the inner hole of the needle 93 is provided with a shallow groove for placing the disc spring so that the disc spring does not move radially. The lower end of the inner nut 91 is provided with a through hole for balancing the pressure inside and outside the valve and reducing the resistance during movement. The structure of the inner nut 91 is beneficial to compensating the coaxiality of the valve body structure, so that the coaxiality of the structure is better.
The two sides of the inner hole of the valve seat 8 are provided with limiting planes 83, the limiting planes 83 are attached to the planes on the outer side wall of the valve needle 93 and used for radially fixing the valve needle so that the valve needle only moves axially, the bottom of the valve seat 8 is sequentially provided with a first step surface 81 and a second step surface 82 from top to bottom, a sealing ring 14 is arranged in the first step surface 81, a main sealing ring 13 is arranged on the inner ring of the sealing ring 14, a pressing ring 15 for limiting the main sealing ring 13 and the sealing ring 14 is arranged in the second step surface 82, the peripheries of the first step surface 81 and the second step surface 82 are chamfered at the shaft shoulder, the sealing ring 14 is conveniently arranged, the sealing ring 14 is prevented from being mechanically damaged, the main sealing ring 13 is matched with the sealing ring 14 for use to form a dynamic sealing combination, the service life is prolonged, the sealing performance is improved, and the internal leakage of the valve body is prevented from being generated, the primary seal ring 13 is an interference fit with the needle assembly 9.
During assembly, the rotor assembly 6 is placed in the valve seat 8, the valve rod 7 and the bearing 11 are loosely matched, and the inner ring of the bearing 11 is in contact with the shaft shoulder of the valve rod 7. Then, the retainer ring is pressed into a shaft shoulder formed by the screw rod and the ball bearing along the bottom end of the valve rod 7, so that the rotor assembly 6 is prevented from moving axially, and the retainer ring is arranged in a retainer ring groove on the valve rod 7. After the valve needle assembly 9 is assembled, girth welding is carried out; the dynamic seal assembly is installed into the valve seat 8 and the valve needle assembly 9 is then assembled with the rotor assembly 6 by passing through the dynamic seal assembly. The needle assembly 9 is threadedly connected to the valve stem 7. The valve base 10 and the valve seat 8 are tightly assembled in a press fit mode.
The electronic expansion valve needs to be connected with the ground, the connecting clamping ring is connected to the shell 1 through hot rivet welding and is electrically connected with the shell 1, and the other end of the connecting clamping ring is fixed on the valve body. Therefore, the grounding connection of the shell 1 is realized, the transmission and feedback of control signals are prevented from being interfered by static electricity and a magnetic field, and the operation of the stator assembly 2 is prevented from being interfered.
Before the electronic expansion valve starts to work, a fluid medium enters the upper cavity of the valve seat through the balance flow channel and further through the thread clearance, the fluid medium can fill the upper cavity of the whole valve seat due to the existence of the magnetism isolating pipe 4, so that the pressure difference between the upper side and the lower side of the valve needle 93 is reduced, the movement resistance of the valve needle 93 is reduced, and the fluid medium cannot leak outwards due to the existence of the main sealing ring 13 and the sealing ring 14.
When the electronic expansion valve starts to work, the liquid high-pressure fluid medium is throttled by the valve port, so that the pressure of the high-pressure fluid medium is reduced, the high-pressure fluid medium is changed into a gas-liquid mixed fluid medium, and heat is released at the same time. The temperature-pressure sensor at the outlet end can input the collected temperature signal and pressure signal into the controller, the controller outputs the signal to the electronic expansion valve after calculation according to the related control program, the current in the winding coil in the stator assembly 2 is controlled to change, so that the stator assembly 2 is controlled to generate a changed excitation magnetic field, the rotor assembly 6 rotates under the action of the excitation magnetic field, the valve rod 7 is driven to move, the valve needle assembly 9 is further driven to move through thread transmission, the opening change of the valve port of the electronic expansion valve is realized, and the purpose of adjusting the flow and the pressure of a fluid medium is further achieved.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the embodiments disclosed herein may be used in any combination, provided that there is no structural conflict, and the combinations are not exhaustively described in this specification merely for the sake of brevity and conservation of resources. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The utility model provides a can prevent dead electronic expansion valve of screw thread card, includes shell (1), sets up stator module (2) in shell (1) and sets up disk seat (8) at shell (1) lower extreme, the internally mounted of stator module (2) have rotor subassembly (6), the outside of rotor subassembly (6) cup jointed magnetic isolation pipe (4), the center of disk seat (8) install valve rod (7) that link to each other with rotor subassembly (6), the lower part of disk seat (8) install valve needle subassembly (9), wire rod portion (71) and the threaded connection of needle subassembly (9) of valve rod (7) lower extreme, the lower extreme of disk seat (8) install valve base (10), valve base (10) on be provided with the valve port that corresponds with needle subassembly (9), its characterized in that still includes:
the anti-blocking component (5) is positioned inside the magnetism isolating pipe (4), the anti-blocking component (5) comprises a main support (50) and a spiral guide rail (59) sleeved on the outer side of the main support (50), a spiral sliding ring (56) is arranged on the spiral guide rail (59), and a shifting part (61) for driving the sliding ring (56) to move is arranged on the rotor component (6);
the valve needle assembly (9) is provided with a balance flow channel (92) corresponding to the valve port, and the balance flow channel (92) is communicated with the upper cavity of the valve seat (8).
2. The electronic expansion valve capable of preventing thread jamming according to claim 1, wherein: the main bracket (50) comprises a shaft part (55) and a positioning disc (53) positioned at the upper end of the shaft part (55), wherein the positioning disc (53) is connected with the magnetism isolating pipe (4).
3. The electronic expansion valve capable of preventing thread jamming according to claim 2, wherein: the outer side wall of the positioning disc (53) is provided with a plurality of positioning grooves (51), and the outer surface of the magnetism isolating pipe (4) is provided with riveting parts (41) correspondingly matched with the positioning grooves (51).
4. The electronic expansion valve capable of preventing thread jamming according to claim 3, wherein: the upper portion of the shaft rod portion (55) is provided with a circle of circular truncated cone (54), an annular groove (58) is formed between the circular truncated cone (54) and the positioning disc (53), and an upper end clamping portion (57) of the spiral guide rail (59) is fixedly clamped in the annular groove (58).
5. The electronic expansion valve capable of preventing thread jamming according to claim 2, wherein: the middle part of the valve rod (7) is connected with the valve seat (8) through a bearing (11), and the upper part of the valve rod (7) is provided with a positioning inserted rod (72) which is axially inserted into a shaft rod part (55) of the main bracket (50).
6. The electronic expansion valve capable of preventing thread jamming according to claim 1, wherein: valve needle subassembly (9) include valve needle (93) and set up at inside interior nut (91) of valve needle (93), interior nut (91) link to each other with lead screw portion (71), the upper end of valve needle (93) install stop ring (12), stop ring (12) inlay mutually and the lower extreme links to each other with interior nut (91) with valve needle (93).
7. The electronic expansion valve capable of preventing thread jamming according to claim 6, wherein: the stop ring is characterized in that two sides of the stop ring (12) are provided with embedded blocks (121), the embedded blocks (121) are embedded into embedded grooves (95) on two sides of the end part of the valve needle (93), and a gap (122) is reserved between the stop ring (12) and the valve needle (93).
8. The electronic expansion valve capable of preventing thread jamming according to claim 6, wherein: an elastic piece (94) is arranged between the lower end of the inner nut (91) and the valve needle (93).
9. The electronic expansion valve capable of preventing thread jamming according to claim 6, wherein: the hole both sides of disk seat (8) be provided with spacing plane (83), spacing plane (83) paste with the plane on needle (93) lateral wall mutually, the bottom of disk seat (8) from top to bottom set gradually first step face (81) and second step face (82), first step face (81) in install sealing washer (14), the inner circle of sealing washer (14) install main sealing ring (13), second step face (82) in be equipped with main sealing ring (13) and the spacing clamping ring (15) of sealing washer (14).
10. The electronic expansion valve capable of preventing thread from being stuck as claimed in claim 1, wherein: the lower extreme of sliding ring (56) be provided with a bending portion (52), the montant offset with bending portion (52).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110453756.1A CN113188275A (en) | 2021-04-26 | 2021-04-26 | Electronic expansion valve capable of preventing thread from being stuck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110453756.1A CN113188275A (en) | 2021-04-26 | 2021-04-26 | Electronic expansion valve capable of preventing thread from being stuck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113188275A true CN113188275A (en) | 2021-07-30 |
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ID=76979292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110453756.1A Pending CN113188275A (en) | 2021-04-26 | 2021-04-26 | Electronic expansion valve capable of preventing thread from being stuck |
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| CN (1) | CN113188275A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352741A (en) * | 2022-01-20 | 2022-04-15 | 广东威灵电机制造有限公司 | Electronic expansion valve, refrigeration equipment and automobile |
| CN114352797A (en) * | 2022-01-20 | 2022-04-15 | 广东威灵电机制造有限公司 | Electronic expansion valve, refrigeration equipment and automobile |
-
2021
- 2021-04-26 CN CN202110453756.1A patent/CN113188275A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352741A (en) * | 2022-01-20 | 2022-04-15 | 广东威灵电机制造有限公司 | Electronic expansion valve, refrigeration equipment and automobile |
| CN114352797A (en) * | 2022-01-20 | 2022-04-15 | 广东威灵电机制造有限公司 | Electronic expansion valve, refrigeration equipment and automobile |
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