CN116136263A

CN116136263A - Electronic expansion valve

Info

Publication number: CN116136263A
Application number: CN202111368420.1A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Hangzhou Sanhua Research Institute Co Ltd
Current assignee: Hangzhou Sanhua Research Institute Co Ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2023-05-19

Abstract

The invention provides an electronic expansion valve, which further comprises a first elastic piece, a second elastic piece and a valve core assembly, wherein the elastic coefficient of the first elastic piece is smaller than that of the second elastic piece, the valve core assembly comprises a first abutting part, a second abutting part and a third abutting part, one end of the first elastic piece is abutted with the first abutting part, the other end of the first elastic piece is abutted with the rotor assembly, the second elastic piece is positioned between the end part of a screw rod, facing towards a valve port, and the second abutting part, and the third abutting part is positioned between the first abutting part and the second abutting part; when the first valve is closed, the third abutting part abuts against the screw rod, and the elastic deformation force of the second elastic piece is smaller than that of the first elastic piece or is in a free state; in the second valve closing state, a gap is formed between the third abutting part and the screw rod in the movement direction of the valve core assembly, and the elastic deformation force of the second elastic piece is larger than that of the first elastic piece. Wear of the valve core assembly is reduced.

Description

Electronic expansion valve

[ field of technology ]

The invention relates to the field of fluid control, in particular to an electronic expansion valve.

[ background Art ]

The refrigerating system comprises a compressor, a throttling element, a heat exchanger and other parts, wherein the throttling element can adopt an electronic expansion valve for throttling adjustment of a refrigerant.

The electronic expansion valve comprises a valve body assembly, a rotor assembly, a valve core, a screw rod and a nut, wherein the valve body assembly is provided with a valve cavity, the rotor assembly, the valve core, the screw rod and the nut are positioned in the valve cavity, one end of the screw rod is fixed with the rotor assembly, threads matched with the nut are arranged on the outer wall of the screw rod, and the valve core is matched with a valve port of the valve body assembly to regulate flow or control on-off of fluid. The electronic expansion valve has larger acting force between the valve needle and the valve port at the moment of closing the valve, can generate larger noise, and can influence the control precision of the electronic expansion valve if abrasion is generated between the valve needle and the valve port.

[ invention ]

The utility model provides an electronic expansion valve, including valve body subassembly, rotor subassembly, lead screw and nut, the valve body subassembly has the valve port, the nut with the valve body subassembly is fixed, the lead screw with the rotor subassembly is fixed, the electronic expansion valve still includes first elastic component, second elastic component and case subassembly, the elasticity coefficient of first elastic component is less than the elasticity coefficient of second elastic component, the case subassembly includes first butt portion, second butt portion and third butt portion, the one end of first elastic component with first butt portion butt, the other end of first elastic component with rotor subassembly butt, the second elastic component is located the lead screw orientation the end of valve port with between the second butt portion, the third butt portion is located between first butt portion and the second butt portion; the electronic expansion valve is provided with a first valve closing state and a second valve closing state, the third abutting part is abutted with the screw rod in the first valve closing state, and the elastic deformation force of the second elastic piece is smaller than that of the first elastic piece or is in a free state; in the second valve closing state, a gap is formed between the third abutting portion and the screw rod in the movement direction of the valve core assembly, and the elastic deformation force of the second elastic piece is larger than that of the first elastic piece.

The electronic expansion valve comprises a first elastic piece and a second elastic piece, wherein the elastic coefficient of the first elastic piece is smaller than that of the second elastic piece, and the elastic deformation force of the second elastic piece is smaller than that of the first elastic piece or is in a free state when the valve is closed in a first state; when the second valve is closed, a gap is formed between the third abutting part and the screw rod in the movement direction of the valve core assembly, the elastic deformation force of the second elastic piece is larger than that of the first elastic piece, and abrasion of the valve core assembly is reduced.

Drawings

FIG. 1 is a cross-sectional view of an electronic expansion valve of the present invention in a fully closed state;

FIG. 2 is a schematic view of the structure of a first component of the present invention;

FIG. 3 is a cross-sectional view of the electronic expansion valve of the present invention open to just without the valve head contacting the valve port;

fig. 4 is a cross-sectional view of the electronic expansion valve of the present invention when opened to a maximum opening degree;

fig. 5 is a partial enlarged view of a portion a in fig. 1.

Reference numerals:

the valve seat 11, valve port 111, housing 12,

rotor 21, rotor fixing portion 22, jack 23, fifth main body portion 231, second protruding portion 232, boss 24,

a screw 3, a fourth abutting portion 31, a screw portion 32, an arc portion 331,

the screw nut 4, the slide groove 41,

the first elastic member 5, the second elastic member 6,

the valve body 71, the second body 711, the first abutment 7111, the third body 712, the second abutment 7121, the fourth body 713, the second member 72, the third abutment 721,

the first member 8, the first body portion 81, and the first projection 82.

Detailed Description

The technical scheme of the specific embodiment is described below with reference to the accompanying drawings.

It should be noted that: although the present invention has been described in detail with reference to the above embodiments, it will be understood by those skilled in the art that the present invention may be modified, combined or equivalent thereto, and all modifications and improvements thereto without departing from the spirit and scope of the present invention are intended to be included in the scope of the appended claims.

Referring to fig. 1, the electronic expansion valve comprises a valve body assembly, a rotor assembly and a coil, wherein the valve body assembly comprises a shell 12 and a valve seat 11, the valve seat 11 and the shell 12 are directly or indirectly sealed and fixed, the valve body assembly is provided with a valve cavity, the rotor assembly is positioned in the valve cavity, the coil is sleeved on the shell 12 and is connected with a driving controller, after the driving controller is electrified, a pulse driving signal is sent to the coil, the coil generates a changing magnetic field, and accordingly the rotor assembly is driven to rotate forwards or reversely.

Referring to fig. 1, the electronic expansion valve includes a screw rod 3 and a nut 4, the nut 4 partially extends into a valve seat 11, the nut 4 is fixed with the valve seat 11, the screw rod 3 is fixed with a rotor assembly and can rotate along with the rotation of the rotor assembly, the electronic expansion valve includes a first elastic member 5, a second elastic member 6 and a valve core assembly, the elastic coefficient of the first elastic member 5 is smaller than that of the second elastic member 6, the valve core assembly includes a first abutting portion 7111, a second abutting portion 7121 and a third abutting portion 721, one end of the first elastic member 5 abuts against the first abutting portion 7111, the other end of the first elastic member 5 abuts against the rotor assembly, the valve body assembly has a valve port 111, the second elastic member 6 is located between the end of the screw rod 3 facing the valve port 111 and the second abutting portion 7121, and the third abutting portion 721 is located between the first abutting portion 7111 and the second abutting portion 7121.

The electronic expansion valve has a first valve-closing state in which the third abutting portion 721 abuts against the screw rod 3, the elastic deformation force of the second elastic member 6 is smaller than the elastic deformation force of the first elastic member 5 or is in a free state (the second elastic member 6 does not directly or indirectly apply a force to the second abutting portion 7121 except for the effect of gravity), and a second valve-closing state in which a gap (having a gap, which means that there is no direct or indirect interaction force between the screw rod 3 and the third abutting portion 721) is provided between the third abutting portion 721 and the screw rod 3 in the direction in which the valve element moves, the elastic deformation force of the second elastic member 6 is larger than the elastic deformation force of the first elastic member 5.

The abutment may be direct abutment or indirect abutment, for example, an intermediate member such as a spacer may be provided between one end of the first elastic member 5 and the first abutment portion 7111, so long as the one end of the first elastic member 5 can be limited when the spring is compressed, and details thereof will not be described herein.

The electronic expansion valve comprises a first elastic member 5 and a second elastic member 6, wherein the elastic coefficient of the first elastic member 5 is smaller than that of the second elastic member 6, and the elastic deformation force of the second elastic member 6 is smaller than that of the first elastic member 5 or is in a free state when the valve is in a first valve-closing state; in the second valve closing state, a gap is provided between the third abutting portion 721 and the screw 3 in the direction in which the valve element assembly moves, and the elastic deformation force of the second elastic member 6 is greater than that of the first elastic member 5, so that wear of the valve element assembly is reduced.

Referring to fig. 1, the valve core assembly includes a valve core 71, the valve core 71 includes a second main body portion 711 and a third main body portion 712, the diameter of the second main body portion 711 is smaller than that of the third main body portion 712, so that a second abutting portion 7121 is formed between the second main body portion 711 and the third main body portion 712, the second elastic member 6 is a spring, the second elastic member 6 is sleeved on the second main body portion 711, an end portion of the third main body portion 712, which is close to the second main body portion 711, forms a second abutting portion 7121, the other end of the second elastic member 6 abuts against the second abutting portion 7121, the second abutting portion 7121 can limit the other end of the second elastic member 6, and when a force is applied to the other end portion of the second elastic member 6, the second elastic member 6 can generate an elastic force.

Referring to fig. 1, one end of the second elastic member 6 contacts one end of the first body 81, the other end of the second elastic member 6 contacts the second contact portion 7121, the other end of the first body corresponds to the end of the screw 3 facing the valve port 111, and in the second valve-closed state, the other end of the first body contacts the end of the screw 3 facing the valve port 111.

Referring to fig. 1 and 5, the screw 3 includes a threaded portion 32 and a protruding portion, the protruding portion is close to the first member 8 with respect to the threaded portion 32, the protruding portion includes an arc portion 331, for example, the arc portion 331 is hemispherical, the arc portion 331 corresponds to the first body portion 81, and in the second valve-closing state, the first body portion 81 abuts against the arc portion 331, friction between the screw 3 and the first body portion is reduced so that the screw is rotated, and abrasion is reduced.

Referring to fig. 1 and 2, the electronic expansion valve includes a first member 8, the first member 8 includes a first main body portion 81, the first main body portion 81 is substantially sheet-shaped, the first main body portion 81 is slidably fitted over a second main body portion 711, the first main body portion 81 is movable relative to the second main body portion 711 in an axial direction of the second main body portion 711, the second abutment portion 7121 is substantially opposite to the first main body portion 81 (projection on a plane perpendicular to an axis of the valve element 71 substantially coincides), the first main body portion 81 is located between the second elastic member 6 and an end portion of the lead screw 3 facing the valve port, and the second elastic member is located between the first main body portion 81 and the second abutment portion 7121.

Referring to fig. 1, one end of the second elastic member 6 is fixed to the first body portion 81, and the inner diameter of the second elastic member 6 is substantially equal to the diameter of the second body portion 711, thereby preventing the spring from being biased when compressed and improving the stability of the movement of the first member 8.

Referring to fig. 1-2, the first component 8 includes a first protruding portion 82, the first protruding portion 82 protrudes from the first main body portion 81 approximately along a radial direction of the first main body portion 81, the nut 4 has a sliding groove 41, the sliding groove 41 is recessed in an inner wall of the nut 4, the first protruding portion 82 is at least partially located in the sliding groove 41, the first protruding portion 82 can slide in the sliding groove 41 in a direction of movement of the valve core assembly, stability of movement of the first component 8 is improved, of course, the number of the first protruding portion 82 and the sliding groove 41 can be set according to specific requirements, for example, the number of the first protruding portion 82 is three, and the three first protruding portions 82 are uniformly arranged along an outer peripheral wall of the first main body portion 81, which is not described herein.

Referring to fig. 1, the valve core assembly includes a second member 72, the second member 72 is sleeved on a second body portion 711, the second member 72 is fixed with the second body portion, the second member 72 is in interference fit with the second body portion 711 or is an integral piece, the second member 72 includes a third abutting portion 721, the screw rod 3 includes a first accommodating hole and a second accommodating hole, the second body portion 711 is threaded through the first accommodating hole, the aperture of the first accommodating hole is smaller than that of the second accommodating hole, a fourth abutting portion 31 is formed between the first accommodating hole and the second accommodating hole, and in the first valve closing state, the third abutting portion 721 abuts against the fourth abutting portion 31.

Of course, one end of the first elastic member 5 may abut against the second member 72, and the first abutting portion 7111 and the third abutting portion 721 are respectively located on two sides of the second member 72, which may be set according to specific requirements, which will not be described herein.

Referring to fig. 1, the rotor assembly includes a rotor 21, a rotor fixing portion 22 and a boss 24, the rotor fixing portion 22 is located at one end of the rotor 21 and is fixed with the rotor 21, one end of the screw rod 3 extends into the rotor fixing portion 22, the boss 24 is located at an end of the screw rod 3 remote from the third body portion 712, in a radial direction of the boss 24, one end of the screw rod 3 is located between the rotor fixing portion 22 and the boss 24, and the boss 24 is fixed with the rotor fixing portion 22.

Referring to fig. 1, the valve body 71 includes a fourth body portion 713, a second body portion 711 is located between the third body portion 712 and the fourth body portion 713, a diameter of the fourth body portion 713 is smaller than a diameter of the second body portion 711, an end portion of the second body portion 711 near the fourth body portion 713 forms a first abutment portion 7111, the first elastic member 5 is partially sleeved on the fourth body portion 713, and one end of the first elastic member 5 abuts against the first abutment portion 7111.

Referring to fig. 1, the rotor assembly includes a top rod 23, the top rod 23 includes a fifth main body portion 231 and a second protruding portion 232 protruding from the fifth main body portion 231, the first elastic member 5 is a spring, the first elastic member 5 is partially sleeved on the fifth main body portion 231, the other end of the first elastic member 5 abuts against the second protruding portion 232, the shaft sleeve 24 has a through hole, the fifth main body portion 231 is threaded through the through hole, the fifth main body portion 231 can move along the axial direction of the through hole, the second protruding portion 232 can abut against the shaft sleeve 24, that is, the shaft sleeve 24 can limit the top rod 23 in the axial direction of the fifth main body portion 231, and when the rotor assembly is located at the upper stop position, the top rod 23 abuts against the inner top wall of the housing 12.

Referring to fig. 1, the electronic expansion valve is in a fully closed state (i.e., a second valve-closing state, i.e., a state in which the rotor assembly is at the lowest end of its stroke), and as shown in fig. 2, the valve seat 11 has a valve port 111, the head of the valve element 71 is abutted against and pressed against the valve port 111, both the first elastic member 5 and the second elastic member 6 are in a compressed state, i.e., the valve element 71 is simultaneously subjected to two downward elastic forces, the first downward elastic force being derived from an elastic force generated by further compression of the first elastic member 5, which is applied to the valve element 71 through the first abutment portion 7111; the second downward elastic force comes from the elastic force generated by the compression of the second elastic member 6, that is, the downward force applied to the first member 8 by the screw 3, the first member 8 applies a force to the second elastic member 6, and at the same time, the other end of the second elastic member 6 abuts against the second abutment portion 7121, the second elastic member 6 is compressed, and the generated elastic force is applied to the valve core 71 through the second abutment portion 7121. The distance between the third contact portion 721 and the fourth contact portion 31 is L1, and L1 > 0.

The superposition of the two elastic forces can provide the pressing force between the head of the valve core 71 and the valve port 111, so that the performance index of resisting the reverse pressure difference when the electronic expansion valve is fully closed can be improved.

Referring to fig. 3, the electronic expansion valve is opened to a first valve-closing state in which the head of the valve body 71 just does not contact the valve port 111. The rotor assembly 20 in this state is opened upward compared to the position of the rotor assembly when the electronic expansion valve is fully closed, and the head of the valve element 71 still abuts against the valve port 111. At this time, the position of the rotor assembly is a critical point, and if the rotor assembly continues to move upwards, the second elastic member 6 is in a free state. The distance between the third contact portion 721 and the fourth contact portion 31 is L2, where L2 is equal to or greater than 0, and L1 is greater than L2.

In the process of needing frequent switching, the electronic expansion valve has larger impact force and abrasion between sealing parts at the moment when the head of the valve core 71 just contacts and separates from the valve port 111. When the head of the valve core 71 just contacts the critical state of the valve port 111 (i.e. the state shown in fig. 3), the valve core 71 is not subjected to the elastic load of the second elastic member 6, but only to the elastic load of the first elastic member 5, and the compression force applied to the electronic expansion valve is small at the moment that the head of the valve core 71 contacts and separates from the valve port 111, so that the abrasion between the head of the valve core 71 and the valve port 111 can be reduced, and the tightness of the electronic expansion valve is improved.

Referring to fig. 4, the electronic expansion valve is opened to the maximum opening degree, the fifth body portion 231 is in contact with the inner ceiling wall of the housing 12, and this state is defined as a third state of the electronic expansion valve, from which, if the rotor assembly continues to be opened upward, an excessively opened state (excessively opened: a state when the rotor assembly is opened upward beyond its prescribed upper limit stroke) occurs, the male screw portion of the screw rod 3 is disengaged from the female screw portion of the nut 4, and after the disengagement, the rotor assembly will not move upward again, and if the coil drives the rotor assembly in the closing direction of the electronic expansion valve, the third abutment portion 721 abuts against the fourth abutment portion 31 due to the downward elastic load of the first elastic member 5, and the screw pair is re-screwed when the rotor assembly rotates.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. An electronic expansion valve, characterized by comprising a valve body assembly, a rotor assembly, a screw rod (3) and a nut (4), wherein the valve body assembly is provided with a valve port (111), the nut (4) is fixed with the valve body assembly, the screw rod (3) is fixed with the rotor assembly, the electronic expansion valve further comprises a first elastic piece (5), a second elastic piece (6) and a valve core assembly, the elastic coefficient of the first elastic piece (5) is smaller than that of the second elastic piece (6), the valve core assembly comprises a first abutting part (7111), a second abutting part (7121) and a third abutting part (721), one end of the first elastic piece (5) abuts against the first abutting part (7111), the other end of the first elastic piece (5) abuts against the rotor assembly, the second elastic piece (6) is positioned between the end of the screw rod (3) facing the valve port (111) and the second abutting part (7121), and the third abutting part (721) is positioned between the first abutting part (7111) and the second abutting part (7111);

the electronic expansion valve has a first valve closing state and a second valve closing state, and in the first valve closing state, the third abutting part (721) abuts against the screw rod (3), and the elastic deformation force of the second elastic piece (6) is smaller than the elastic deformation force of the first elastic piece (5) or is in a free state; in the second valve closing state, a gap is formed between the third abutting portion (721) and the screw rod (3) in the movement direction of the valve element assembly, and the elastic deformation force of the second elastic member (6) is larger than that of the first elastic member (5).

2. The electronic expansion valve of claim 1, characterized in that the electronic expansion valve comprises a first component (8), the first component (8) comprises a first body portion (81), the second abutment portion (7121) is generally opposite to the first body portion (81), the valve cartridge assembly comprises a valve cartridge (71), the first component (8) is slidably sleeved on the valve cartridge (71), and the first body portion (81) is located between the second elastic member (6) and an end of the screw (3) facing the valve port.

3. The electronic expansion valve according to claim 2, characterized in that the first part (8) comprises a first protrusion (82), the first protrusion (82) protruding from the first body part (81) substantially in the radial direction of the first body part (81), the nut (4) having a chute (41), the chute (41) being recessed in the inner wall of the nut (4), the first protrusion (82) being at least partially located in the chute (41), the first protrusion (82) being slidable in the chute (41) in the direction of movement of the valve element assembly.

4. An electronic expansion valve according to claim 3, wherein the valve core (71) comprises a second body portion (711) and a third body portion (712), the diameter of the second body portion (711) being smaller than the diameter of the third body portion (712), such that the second abutting portion (7121) is formed between the second body portion (711) and the third body portion (712), and the second elastic member (6) is sleeved on the second body portion (711).

5. The electronic expansion valve according to claim 4, wherein the second elastic member (6) is a spring, one end of the second elastic member (6) is in contact with one end of the first body portion (81), the other end of the second elastic member (6) is in contact with the second abutment portion (7121), the other end of the first body portion (81) corresponds to an end of the screw rod (3) facing the valve port (111), and in the second valve-closing state, the other end of the first body portion (81) abuts against an end of the screw rod (3) facing the valve port (111).

6. The electronic expansion valve according to claim 5, characterized in that the screw (3) comprises a threaded portion (32) and a protruding portion, the protruding portion being close to the first member (8) with respect to the threaded portion (32), the protruding portion comprising a circular arc portion (331), the circular arc portion (331) corresponding to the first body portion (81), and in the second valve-closed state the first body portion (81) abutting against the circular arc portion (331).

7. The electronic expansion valve according to claim 4, wherein the valve element assembly comprises a second member (72), the second member (72) is sleeved on the second body portion (711), the second member (72) is fixed to the second body portion (711), and the second member (72) comprises a third abutting portion (721);

the screw rod (3) comprises a first accommodating hole and a second accommodating hole, the second main body part (711) penetrates through the first accommodating hole, the aperture of the first accommodating hole is smaller than that of the second accommodating hole, a fourth abutting part (31) is formed between the first accommodating hole and the second accommodating hole, and the third abutting part (721) abuts against the fourth abutting part (31) in the first valve closing state.

8. The electronic expansion valve according to any of claims 4-7, characterized in that the valve core comprises a fourth body portion (713), the second body portion (711) is located between the third body portion (712) and the fourth body portion (713), the diameter of the fourth body portion (713) is smaller than the diameter of the second body portion (711), the end of the second body portion (711) close to the fourth body portion (713) forms the first abutment portion (7111), and the first elastic member (5) is partly sleeved on the fourth body portion (713).

9. The electronic expansion valve according to claim 8, wherein the rotor assembly comprises a push rod (23), the push rod (23) comprises a fifth main body part (231) and a second protruding part (232) protruding out of the fifth main body part (231), the first elastic piece (5) is partially sleeved on the fifth main body part (231), and the other end of the first elastic piece (5) is abutted against the second protruding part (232).

10. The electronic expansion valve according to claim 9, wherein the rotor assembly comprises a shaft sleeve (24), the shaft sleeve (24) is located at the end of the screw rod (3) far away from the third main body part (712), the shaft sleeve (24) is provided with a through hole, the fifth main body part (231) penetrates through the through hole, the fifth main body part (231) can move along the axial direction of the through hole, and the second protruding part (232) can be abutted with the shaft sleeve (24).