Valve

Abstract

A valve comprises a valve seat, a sleeve, a nut assembly, a valve element assembly and a lead screw assembly, the valve element assembly comprises a first stop wall part, the lead screw assembly comprises a second stop wall part, the valve seat comprises a valve port part, and the first stop wall part is located on the side, away from the valve port part, of the second stop wall part; the valve comprises a first magnetic part and a second magnetic part, the first magnetic part and the valve element assembly are arranged in a limiting mode, the second magnetic part and the lead screw assembly are arranged in a limiting mode, the first magnetic part is located on the side, away from the valve port part, of the second magnetic part, and the magnetic poles of the opposite sides of the first magnetic part and the second magnetic part are opposite. The first pole shoe comprises a first main body part and a second sleeve part, the second sleeve part extends away from the valve port part from the first main body part, the first magnetic piece is sleeved with the first main body part, the second sleeve part surrounds the first magnetic piece, and a preset distance is formed between the inner wall of the second sleeve part and the outer wall of the first magnetic piece. When the valve is closed, relative rotation of the valve element assembly and the valve port part is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, in particular to a valve. Background Art

[0002] An electronic expansion valve comprises a shell, a valve seat, a rotor, a nut and a screw, wherein the shell is fixed to the valve seat, the electronic expansion valve has a valve cavity, the rotor, the nut and the screw are located in the valve cavity, the screw comprises a transmission part and a valve needle part, the rotor is fixedly connected to the transmission part, the transmission part and the nut thread cooperate, the transmission part and the valve needle part are an integral part, the valve seat has a valve port, the rotor drives the transmission part to rotate, and since the transmission part and the nut thread cooperate, the transmission part moves up and down, so that the valve needle part moves up and down to close or open the valve port.

[0003] When closing the valve, a certain valve closing force is required. When closing the valve, after the valve needle contacts the valve port, the valve needle and the valve port rotate relative to each other, causing the valve needle to wear. Summary of the invention

[0004] The following technical solution is provided: a valve comprises a valve seat, a sleeve and a nut assembly, wherein the valve seat is fixed to one end of the sleeve, the valve has an accommodating chamber, the nut assembly is located in the accommodating chamber, the valve comprises a power assembly, the power assembly comprises a valve core assembly and a screw assembly, the valve core assembly comprises a first stop wall portion, the screw assembly comprises a second stop wall portion, the valve seat comprises a valve mouth portion, the first stop wall portion is located on a side of the second stop wall portion away from the valve mouth portion; the valve comprises a first magnetic member and a second magnetic member, the first magnetic member and the valve core assembly limit The valve body is provided with a first pole shoe, the first pole shoe comprises a first main body and a second sleeve portion, the second sleeve portion extends from the first main body portion away from the valve mouth portion, the first main body portion is sleeved on the first magnetic member, the second sleeve portion is surrounded by the first magnetic member, and the inner wall of the second sleeve portion has a preset distance from the outer wall of the first magnetic member.

[0005] Such a valve, the valve core assembly includes a first stop wall portion, the screw rod assembly includes a second stop wall portion, the valve includes a first magnetic component and a second magnetic component, the first magnetic component is located on the side of the second magnetic component that is away from the valve mouth portion, the magnetic poles of the first magnetic component and the second magnetic component opposite to each other are opposite, when closing the valve, after the valve core assembly contacts the valve mouth portion, the screw rod assembly continues to move downward, and the first stop wall portion separates from the second stop wall portion, as the screw rod assembly continues to move downward, the distance between the first magnetic component and the second magnetic component decreases, and the repulsive force between the first magnetic component and the second magnetic component increases, so as to increase the interaction force between the valve core assembly and the valve mouth, the first stop wall portion separates from the second stop wall portion, and when closing the valve, the relative rotation of the valve core assembly and the valve mouth portion is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a cross-sectional view of an embodiment of the valve of the invention;

[0007] Figure 2 yes Figure 1 A magnified view of part A;

[0008] Figure 3 It is a partial structural schematic diagram of another embodiment of the valve in the present invention;

[0009] Figure 4 It is a partial structural schematic diagram of another embodiment of the valve in the present invention;

[0010] Figure 5 It is a partial structural schematic diagram of another embodiment of the valve in the present invention.

[0011] Reference numerals:

[0012] Valve seat 1, valve body 11, valve core seat 12, valve port 121,

[0013] Sleeve 2, nut 31,

[0014] The first stop wall portion 411, the valve core 412, the first sleeve portion 4121, the connecting portion 4122, the valve needle portion 4123, the second groove 4124, the first mounting portion 4125, the first component 413, the first limiting portion 414,

[0015] The second stop wall portion 421, the screw rod 422, the second component 423, the first groove 4231, the second limiting portion 424, the third component 425, the third groove 4251, the fourth component 426, the fourth sleeve portion 4261, the second mounting portion 4262,

[0016] Magnetic rotor 431, support frame 432,

[0017] The first magnetic member 5 , the first pole shoe 6 , the first main body 61 , the second sleeve 62 , the second magnetic member 7 , the second pole shoe 8 , the second main body 81 , and the third sleeve 82 . DETAILED DESCRIPTION

[0018] The technical solution of the specific implementation method is described below in conjunction with the accompanying drawings.

[0019] It should be noted that: although this specification has described the present invention in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that technicians in the relevant technical field can still modify, combine or replace the present invention with equivalents, and all technical solutions and improvements thereto that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

[0020] refer to Figure 1 A valve comprises a valve seat 1, a sleeve 2 and a nut assembly, wherein the valve seat 1 is fixed to one end of the sleeve 2, the valve seat 1 comprises a valve body 11 and a valve core seat 12, the valve body 11 is fixed to one end of the sleeve 2, the valve body 11 has a first through hole, a valve core seat 12 is partially located in the first through hole, the valve core seat 12 is welded to a wall portion corresponding to the first through hole, the valve core seat 12 has a valve mouth portion 121, the valve has an accommodating cavity, the nut assembly is located in the accommodating cavity, the nut assembly comprises a nut 31, and the nut 31 is fixed to the valve core seat 12.

[0021] refer to Figure 1 The power assembly includes a rotor assembly, a screw assembly and a valve core assembly. The rotor assembly includes a magnetic rotor 431 and a support frame 432. The support frame 432 is fixed to the magnetic rotor 431. The screw assembly includes a screw 422. The magnetic rotor 431 and the screw 422 are fixed. The screw 422 and the nut 314 are threaded together. The magnetic rotor 431 drives the screw 422 to rotate under the action of electromagnetic force. Since the screw 422 and the nut 314 are threaded together, the screw 422 moves up and down. The valve core assembly includes a valve core 412 (described below). The screw 422 can drive the valve core 412 to move up and down. When the screw 422 moves up and down, the valve core 412 approaches or moves away from the valve mouth 121, and the valve core 412 cooperates with the valve mouth 121, thereby realizing the opening and closing of the valve and flow regulation.

[0022] refer to Figure 2 The valve core assembly includes a first stop wall portion 411, and the screw rod assembly includes a second stop wall portion 421. The first stop wall portion 411 is located on the side of the second stop wall portion 421 away from the valve mouth portion 121. When the valve is in an open state, the first stop wall portion 411 abuts against the second stop wall portion 421, and the screw rod assembly drives the valve core 412 to move in a direction away from the valve mouth portion 121 through the abutment between the first stop wall portion 411 and the second stop wall portion 421; when the valve is closed, after the valve core 412 contacts the valve mouth portion 121, the screw rod 422 continues to move downward, and at this time the first stop wall portion 411 is disengaged from the second stop wall portion 421.

[0023] refer toFigure 2 The valve includes a first magnetic component 5 and a second magnetic component 7. The first magnetic component 5 is limited by the valve core assembly, and the second magnetic component 7 is limited by the screw assembly. The first magnetic component 5 is located on the side of the second magnetic component 7 that is away from the valve mouth portion 121, and the magnetic poles of the first magnetic component 5 and the second magnetic component 7 are opposite.

[0024] In such a valve, the valve core assembly includes a first stop wall portion 411, the screw rod assembly includes a second stop wall portion 421, and the valve includes a first magnetic component 5 and a second magnetic component 7. The first magnetic component 5 is located on the side of the second magnetic component 7 that is away from the valve mouth portion 121, and the magnetic poles of the first magnetic component 5 and the second magnetic component 7 opposite to each other are opposite. When closing the valve, after the valve core assembly contacts the valve mouth portion 121, the screw rod assembly continues to move downward, and the first stop wall portion 411 separates from the second stop wall portion 421. As the screw rod assembly continues to move downward, the distance between the first magnetic component 5 and the second magnetic component 7 decreases, and the repulsive force between the first magnetic component 5 and the second magnetic component 7 increases, so as to increase the interaction force between the valve core assembly and the valve mouth, and the first stop wall portion 411 separates from the second stop wall portion 421. When closing the valve, the relative rotation of the valve core assembly and the valve mouth portion 121 is reduced, the wear of the valve core 412 and / or the valve mouth portion 121 is reduced, and internal leakage is reduced.

[0025] In the height direction of the valve (axial direction of the screw rod 422), the first magnetic component 5 and the valve core assembly are limited, and the second magnetic component 7 and the screw rod assembly are limited. As long as the repulsive force between the first magnetic component 5 and the second magnetic component 7 is transmitted to the valve core assembly, it will not be elaborated here.

[0026] refer to Figure 1 - Figure 2 The valve core assembly includes a first limiting portion 414, the first magnetic member 5 is located on the side of the first limiting portion 414 away from the valve mouth 121, and the first magnetic member 5 contacts the first limiting portion 414. The screw assembly includes a second limiting portion 424, the second limiting portion 424 is located on the side of the second magnetic member 7 away from the valve mouth 121, and the second magnetic member 7 contacts the second limiting portion 424. When closing the valve, after the valve core 412 contacts the valve mouth 121, the screw 422 continues to move downward, the distance between the first magnetic member 5 and the second magnetic member 7 decreases, and the repulsive force between the first magnetic member 5 and the second magnetic member 7 increases. Since the first magnetic member 5 contacts the first limiting portion 414, the force of the first magnetic member 5 on the first limiting portion 414 increases, thereby increasing the force of the valve core 412 on the valve mouth 121 and improving the valve closing force.

[0027] Of course, the valve core assembly may also have an elastic part, and the first magnetic part 5 is in contact with the elastic part, that is, the first limiting portion 414 is located on the elastic part. It is sufficient to transmit the repulsive force between the first magnetic part 5 and the second magnetic part 7 to the valve core assembly. Of course, the screw assembly may also be similarly configured, which will not be elaborated here.

[0028] Reference Figure 2 The spool assembly includes a spool 412 and a first component 413. The spool 412 includes a first sleeve portion 4121. The end of the first sleeve portion 4121 away from the valve port portion 121 is sleeved on the first component 413. The first component 413 is fixed to the first sleeve portion 4121. The first stop wall portion 411 is located on the first component 413. The first sleeve portion 4121 can slide along the inner wall of the spool seat 12, improving the stability of the movement of the spool 412 and reducing the deviation of the valve needle.

[0029] Reference Figure 2 The spool 412 includes a connecting portion 4122 and a valve needle portion 4123. The first sleeve portion 4121 extends from the connecting portion 4122 in a direction away from the valve port portion 121. The first sleeve portion 4121 is cylindrical. The valve needle portion 4123 extends from the connecting portion 4122 away from the first sleeve portion 4121. At least a part of the wall portion of the connecting portion 4122 facing away from the valve needle portion 4123 is a first limiting portion 414.

[0030] Reference Figure 2 The lead screw assembly includes a lead screw 422 and a second component 423. The lead screw 422 passes through the first component 413. The first component 413 is located on the side of the second component 423 away from the valve port portion 121. The second component 423 is fixed to the lead screw 422, such as by welding, interference fit, etc. The second stop wall portion 421 is located on the second component 423. The second component 423 has a first groove 4231. The second magnetic member 7 is located in the first groove 4231. The bottom wall of the first groove 4231 is a second limiting portion 424. The first magnetic member 5 is adapted to the inner wall of the first sleeve portion 4121.

[0031] Reference Figure 3 - Figure 4 The valve includes a first pole shoe 6. The first limiting portion 414 and the side wall portion of the first pole shoe 6 are limitedly arranged, or the first pole shoe 6 is located on the side of the first limiting portion 414 away from the valve port portion 121 and in contact with the first limiting portion 414. The first pole shoe 6 includes a first main body portion 61 and a second sleeve portion 62. The second sleeve portion 62 extends from the first main body portion 61 away from the valve port portion 121. The first main body portion 61 is sleeved on the first magnetic member 5. The first main body portion 61 is in interference fit with the first magnetic member 5. The second sleeve portion 62 surrounds the first magnetic member 5. There is a preset distance between the inner wall of the second sleeve portion 62 and the outer wall of the first magnetic member 5. The first pole shoe 6 introduces the magnetic force at one end of the first magnetic member 5 to form a closed magnetic force line loop and magnetic flux concentration to enhance the magnetic force.

[0032] For example, the upper side of the first magnetic member 5 is the N pole and the lower side is the S pole, and the upper side of the second sleeve portion 62 is the N pole.

[0033] Reference Figure 3 - Figure 4, the height of the first magnetic member 5 is H1, the height of the first main body portion 61 is H2, the diameter of the first magnetic member 5 is D, 0.25D ≤ H2 < 0.5H1, the wall portion of the first main body portion 61 facing the valve port portion 121 and the wall portion of the first magnetic member 5 facing the valve port portion 121 are located in the same plane, excluding manufacturing, installation and other errors.

[0034] Reference Figure 3 , the height of the second sleeve portion 62 is H3, and H1 = H2 + H3.

[0035] Reference Figure 3 , the connecting portion 4122 has a second groove 4124, at least a part of the first main body portion 61 is located in the second groove 4124, the side wall of the second groove 4124 is sleeved on the first main body portion 61, the wall portion of the first main body portion 61 facing the valve port portion 121 contacts the bottom wall of the second groove 4124, and the wall portion of the first magnetic member 5 facing the valve port portion 121 contacts the bottom wall of the second groove 4124.

[0036] Reference Figure 3 , the valve includes a second pole shoe 8, the second pole shoe 8 includes a second main body portion 81 and a third sleeve portion 82, the third sleeve portion 82 extends from the second main body portion 81 towards the valve port portion 121, the third sleeve portion 82 is substantially perpendicular to the second main body portion 81, the second main body portion 81 is sleeved on the second magnetic member 7, the third sleeve portion 82 surrounds the second magnetic member 7, there is a preset distance between the inner wall of the third sleeve portion 82 and the outer wall of the second magnetic member 7, and the second sleeve portion 62 is opposite to the third sleeve portion 82.

[0037] The screw rod assembly includes a screw rod 422, the screw rod 422 passes through the first component 413, the second main body portion 81 is sleeved on the screw rod 422, the second stop wall portion 421 is located at the second main body portion 81, and the second magnetic member 7 contacts the screw rod 422.

[0038] Reference Figure 3 , the third sleeve portion 82 is opposite to the second sleeve portion 62, the wall thickness of the third sleeve portion 82 is the same as the wall thickness of the second sleeve portion 62, and the center line of the third sleeve portion 82 coincides with the center line of the second sleeve portion 62.

[0039] Reference Figure 5 , the screw rod assembly includes a screw rod 422, a third component 425 and a fourth component 426, the fourth component 426 includes a fourth sleeve portion 4261, the fourth sleeve portion 4261 is sleeved on the third component 425, the fourth sleeve portion 4261 is fixed to the third component 425, the screw rod 422 is fixed to the third component 425, the third component 425 has a third groove 4251, and the second magnetic member 7 is adapted to the third groove 4251.

[0040] Reference Figure 5, the spool assembly includes a spool 412. The spool 412 includes a first mounting portion 4125 and a valve needle portion 4123. The valve needle portion 4123 protrudes from the wall portion of the first mounting portion 4125 facing the valve port portion 121. The fourth component 426 includes a second mounting portion 4262. The second mounting portion 4262 protrudes from the inner wall portion of the fourth sleeve portion 4261. The valve needle portion 4123 passes through the second mounting portion 4262. At least part of the wall portion of the first mounting portion 4125 facing the valve port portion 121 is a first stop wall portion 411, and at least part of the wall portion of the second mounting portion 4262 facing away from the valve port portion 121 is a second stop wall portion 421.

[0041] The first magnetic member 5 is arranged in a limiting manner with the spool assembly. For example, the first limiting portion 414 is arranged in a limiting manner with the side wall portion of the first magnetic member 5. The side wall portion of the first magnetic member 5 is a wall portion extending in the height direction of the first magnetic member 5. For example, the side wall portion of the first magnetic member 5 is a wall portion extending in the axial direction of the first sleeve portion 4121. A part of the inner wall of the first sleeve portion 4121 is the first limiting portion 414. The side wall portion of the first magnetic member 5 is in interference fit, welded or bonded with an adhesive to the first limiting portion 414.

[0042] When the side wall portion of the first magnetic member 5 is welded to the first limiting portion 414, the material of the first magnetic member 5 is a permanent magnet or the like. First, the first magnetic member 5 is welded to the first limiting portion 414, and then the permanent magnet is magnetized.

[0043] The side wall portion of the first magnetic member 5 is bonded to the first limiting portion 414 with an adhesive, for example, it can be bonded with glue.

[0044] The second magnetic member 7 is arranged in a limiting manner with the lead screw assembly. For example, the second limiting portion 424 is arranged in a limiting manner with the side wall portion of the second magnetic member 7. The side wall portion of the second magnetic member 7 is a wall portion extending in the height direction of the second magnetic member 7. For example, the side wall portion of the second magnetic member 7 is a wall portion extending in the axial direction of the first sleeve portion 4121. At least part of the groove side wall of the first groove 4231 is the second limiting portion 424. The second magnetic member 7 is in interference fit, welded or bonded with an adhesive to the second limiting portion 424.

[0045] When the side wall portion of the second magnetic member 7 is welded to the second limiting portion 424, the material of the second magnetic member 7 is a permanent magnet or the like. First, the second magnetic member 7 is welded to the second limiting portion 424, and then the permanent magnet is magnetized.

[0046] The side wall portion of the second magnetic member 7 is bonded to the second limiting portion 424 with an adhesive, for example, it can be bonded with glue.

[0047] Of course, the first magnetic member 5 can be located on the side of the first limiting portion 414 away from the valve port portion 121, the first magnetic member 5 is in contact with the first limiting portion 414, and the second limiting portion 424 is limitedly arranged with the side wall portion of the second magnetic member 7; or, the first magnetic member 5 is located on the side of the first limiting portion 414 away from the valve port portion 121, the first magnetic member 5 is in contact with the first limiting portion 414, the second limiting portion 424 is located on the side of the second magnetic member 7 away from the valve port portion 121, and the second magnetic member 7 is in contact with the second limiting portion 424, etc. Details are not described herein.

[0048] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A valve, comprising a valve seat (1), a sleeve (2) and a nut assembly, wherein the valve seat (1) is fixed to one end of the sleeve (2), the valve has a receiving cavity, the nut assembly is located in the receiving cavity, It is characterized in that The valve comprises a power assembly, the power assembly comprises a valve core assembly and a screw assembly, the valve core assembly comprises a first stop wall portion (411), the screw assembly comprises a second stop wall portion (421), the valve seat (1) comprises a valve mouth portion (121), and the first stop wall portion (411) is located on a side of the second stop wall portion (421) away from the valve mouth portion (121); The valve comprises a first magnetic component (5) and a second magnetic component (7), the first magnetic component (5) being arranged to limit position with the valve core assembly, the second magnetic component (7) being arranged to limit position with the screw assembly, the first magnetic component (5) being located on a side of the second magnetic component (7) facing away from the valve opening (121), and the magnetic poles of the first magnetic component (5) and the second magnetic component (7) being opposite to each other; The valve comprises a first pole shoe (6), the first pole shoe (6) comprises a first main body portion (61) and a second sleeve portion (62), the second sleeve portion (62) extends from the first main body portion (61) away from the valve mouth portion (121), the first main body portion (61) is sleeved on the first magnetic member (5), the second sleeve portion (62) is surrounded by the first magnetic member (5), and the inner wall of the second sleeve portion (62) has a preset distance from the outer wall of the first magnetic member (5).

2. The valve according to claim 1, It is characterized in that The height of the first magnetic component (5) is H1, the height of the first main body (61) is H2, the diameter of the first magnetic component (5) is D, 0.25D≤H2<0.5H1, and the wall of the first main body (61) facing the valve mouth (121) and the wall of the first magnetic component (5) facing the valve mouth (121) are located in the same plane.

3. The valve according to claim 2, It is characterized in that The height of the second sleeve portion (62) is H3, where H1 = H2 + H3.

4. The valve according to claim 3, It is characterized in that The valve core assembly comprises a first limiting portion (414), the first limiting portion (414) being arranged to limit the side wall portion of the first pole shoe (6), or the first pole shoe (6) being located on a side of the first limiting portion (414) away from the valve mouth portion (121), and the first pole shoe (6) being in contact with the first limiting portion (414).

5. The valve according to claim 4, It is characterized in that The spool assembly includes a spool (412) and a first component (413). The spool (412) includes a first sleeve portion (4121). The end of the first sleeve portion (4121) remote from the valve port portion (121) is sleeved on the first component (413). The first component (413) is fixed to the first sleeve portion (4121). The first stop wall portion (411) is located on the first component (413).

6. The valve according to claim 5, wherein, the spool (412) includes a connecting portion (4122) and a valve needle portion (4123). The first sleeve portion (4121) extends from the connecting portion (4122) in a direction away from the valve port portion (121). The valve needle portion (4123) extends from the connecting portion (4122) away from the first sleeve portion (4121). At least a part of the wall portion of the connecting portion (4122) facing away from the valve needle portion (4123) is the first limiting portion (414).

7. The valve according to claim 6, wherein, the connecting portion (4122) has a second groove (4124). At least a part of the first main body portion (61) is located in the second groove (4124). The side wall of the second groove (4124) is sleeved on the first main body portion (61). The wall portion of the first main body portion (61) facing the valve port portion (121) contacts the bottom wall of the second groove (4124). The wall portion of the first magnetic member (5) facing the valve port portion (121) contacts the bottom wall of the second groove (4124).

8. The valve according to claim 7, wherein, the valve includes a second pole shoe (8). The second pole shoe (8) includes a second main body portion (81) and a third sleeve portion (82). The third sleeve portion (82) extends from the second main body portion (81) towards the valve port portion (121). The second main body portion (81) is sleeved on the second magnetic member (7). The third sleeve portion (82) surrounds the second magnetic member (7). There is a preset distance between the inner wall of the third sleeve portion (82) and the outer wall of the second magnetic member (7). The second sleeve portion (62) is opposite to the third sleeve portion (82).

9. The valve according to claim 8, wherein, the lead screw assembly includes a second limiting portion (424). The second limiting portion (424) is located on the side of the second magnetic member (7) remote from the valve port portion (121). The second magnetic member (7) contacts the second limiting portion (424). The second main body portion (81) is sleeved on the lead screw (422). The second stop wall portion (421) is located on the second main body portion (81).

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