CN202790582U

CN202790582U - Electronic expansion valve

Info

Publication number: CN202790582U
Application number: CN2012200685522U
Authority: CN
Inventors: 沈珂; 刘敬喜; 韩荣耀; 胡飞雪
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2012-02-28
Filing date: 2012-02-28
Publication date: 2013-03-13
Anticipated expiration: 2022-02-28

Abstract

The utility model relates to an electronic expansion valve (1), include: a valve body (10); a support seat (20, 120) fixedly arranged on the valve body (10); a main shaft (30) rotatably supported by the bearing block (20, 120); a bearing assembly (40) for limiting the axial displacement of the spindle (30) is arranged in the bearing block (20, 120). According to the utility model discloses an electronic expansion valve can effectively restrict the axial motion of main shaft to can avoid the rotor to bear the axial force.

Description

Electric expansion valve

Technical field

The utility model relates to a kind of electric expansion valve.

Background technique

Electric expansion valve is the vitals in the cooling/heating system, is mainly used in the flow of refrigerant fluid is regulated.Traditional electric expansion valve generally comprises driving mechanism (stepper motor), actuator (thread screw mechanism), throttle mechanism (needle valve seat) and relevant assisting agency.In this electric expansion valve, the rotation of stepper motor is that the axial motion of needle is to open and close valve seat by the thread screw organisation conversion.Yet in this electric expansion valve, because the reaction force of thread screw mechanism, the rotor of stepper motor will bear the active force of axial direction, and this can affect the stable output of rotor.

Therefore, need a kind of electric expansion valve that can avoid rotor to bear axial force.

The model utility content

A purpose of one or more mode of executions of the present utility model provides a kind of electric expansion valve that can avoid rotor to bear axial force.

Another purpose of one or more mode of executions of the present utility model provides the more stable electric expansion valve of a kind of operation.

Another purpose of one or more mode of executions of the present utility model provides that a kind of assembling is more prone to, the more simple electric expansion valve of structure.

One or more to achieve these goals according to aspect of the utility model, provide a kind of electric expansion valve, comprising: valve body; Be fixedly installed on the supporting base on the described valve body; The main shaft that is supported in rotating mode by described supporting base; Wherein, in described supporting base, be provided with bearing unit be used to the axial displacement that limits described main shaft.

Preferably, described main shaft comprises that the first paragraph that cooperates with the rotor of described electric expansion valve and diameter less than the second segment of described first paragraph, are formed with stepped part between described first paragraph and described second segment.

Preferably, described bearing unit comprises: be fixed on fixed block on the second segment of described main shaft, be arranged on the bearing between the stepped part of described fixed block and described main shaft and be fixed on the described supporting base and against the maintenance lid of the upper surface of described bearing.

Preferably, described fixed block is the nut that is screwed on the second segment of described main shaft.

Preferably, described fixed block is arranged in the described supporting base in rotating mode.

Preferably, described maintenance lid is fixed on the described supporting base via being threaded.

Alternately, described supporting base comprises separate left side and right-hand part.

Preferably, the bottom of described left side and described right-hand part is kept by described valve body, and the top of described left side and described right-hand part is kept by snap ring.

Preferably, described bearing unit comprises fixed block on the second segment that is fixed on described main shaft, be arranged on the bearing between the stepped part of described fixed block and described main shaft, and is formed be used to the groove that keeps described bearing in described left side and the described right-hand part.

Preferably, described fixed block is arranged on the snap ring on the second segment of described main shaft.

Preferably, described electric expansion valve further comprises the ut socket that can axially slide and still can not rotate in described supporting base.

Preferably, described supporting base has polygonal internal surface, and described ut socket has the polygonal outer surface that the polygonal internal surface with described supporting base matches.

Preferably, the outer surface of described ut socket has planar surface portion, and the internal surface of described supporting base has the planar surface portion that the planar surface portion with described ut socket matches.

Preferably, have internal thread segment in the described ut socket, described main shaft has the external thread section that matches with described internal thread segment.

Preferably, slidably be provided with needle in the described ut socket, described needle is used to open or close the valve opening in the described valve body.

Preferably, described electric expansion valve further comprises the guide for the described needle of axial lead.

Preferably, described main shaft is engaged in the described rotor in the mode that still can not rotate that can endwisely slip.

Preferably, described bearing is sliding bearing.

Advantage according to the electric expansion valve of one or more mode of executions of the present utility model is:

In the electric expansion valve according to a kind of mode of execution of the utility model, be provided with the bearing unit for the axial displacement of restriction main shaft in the supporting base that is fixedly installed with valve seat.The axial force due to the thread screw mechanism because the axial retention effect of bearing unit, the rotor of electric expansion valve will can or can not be born hardly.Therefore, the rotation that rotor can be more stable, thus the control of electric expansion valve will be more accurately with steady.

In the electric expansion valve according to a kind of mode of execution of the utility model, be provided with fixed block at main shaft, and bearing is arranged between the stepped part and fixed block of main shaft.On the other hand, bearing also is supported seat and keeps lid fixing.Therefore, the main shaft axial force of the bearing fixed component for example on supporting base and the valve body that can be reliably be delivered to electric expansion valve by this bearing unit.

On the other hand, owing to adopt above-mentioned structure, can bearing be resisted against on the stepped part of main shaft first, thereby then fastening fixed block keeps bearing.In a kind of mode of execution of the present utility model, fixed block can be the nut that can be screwed on the main shaft.After this, the main shaft that has kept bearing can be arranged on the supporting base, then will keep the mode that for example is threaded connection of lid to be fixed on the supporting base, thereby so that bearing and main shaft with respect to the supporting base axial restraint.Therefore, can easily assemble according to the electric expansion valve of the utility model mode of execution.

In the electric expansion valve according to a kind of mode of execution of the utility model, supporting base can comprise separate left side and right-hand part, and the groove that keeps bearing can be set in left side and right-hand part.In addition, bearing can be fixed with respect to the stepped part of main shaft by snap ring.In this embodiment, the main shaft that has kept bearing can be arranged in one of them half one of supporting base, then cover another half one.The mode that after this, the supporting base that is combined for example can be threaded connection is fixed in the valve body.Snap ring can also be set in the upper end of supporting base further firmly to keep supporting base can not be separated from each other.Adopt above-mentioned mode of execution, can easily assemble electric expansion valve.

In the electric expansion valve according to a kind of mode of execution of the utility model, may further include and can in supporting base, axially slide but the ut socket that can not rotate, and ut socket can have internal thread, an end of main shaft can have outside thread.Thereby by the effect of the screw pair between main shaft and the ut socket, rotatablely moving of main shaft is converted into the ut socket axial motion.Therefore, ut socket can drive the needle axial motion to open and close valve opening.Adopt above-mentioned structure, rotor and main shaft only bear and rotatablely move, and ut socket and needle only bear axial motion.Therefore, the operating temperature of electric expansion valve, control accuracy is high.

In the electric expansion valve according to a kind of mode of execution of the utility model, main shaft is engaged in the rotor in the mode that still can not rotate that can endwisely slip.Therefore, further guaranteed that axial force is not delivered to rotor.In addition, the processing of bearing, main shaft, fixed block, supporting base and maintenance lid does not need too high precision, and the cooperation between them does not need too high precision yet, thereby has reduced processing cost and assembly cost.

Description of drawings

By the description referring to accompanying drawing, it is easier to understand that the feature and advantage of one or several mode of execution of the present utility model will become, wherein:

Fig. 1 is the sectional view according to the electric expansion valve of the utility model the first mode of execution;

Fig. 2 is the view sub-anatomy of electric expansion valve shown in Figure 1, has wherein omitted stator component;

Fig. 3 is the enlarged view of the supporting base of electric expansion valve shown in Figure 1;

Fig. 4 is the enlarged view of the ut socket of electric expansion valve shown in Figure 1;

Fig. 5 is the sectional view according to the electric expansion valve of the utility model the second mode of execution;

Fig. 6 is the view sub-anatomy of electric expansion valve shown in Figure 5; And

Fig. 7 is the enlarged view of the ut socket of electric expansion valve shown in Figure 5.

Embodiment

Following description related to the preferred embodiment only is exemplary, and never is the restriction to the utility model and application or usage.

At first with reference to the essential structure of Fig. 1-4 description according to the electric expansion valve of the utility model the first mode of execution.

Can comprise for the valve section that the flow of the fluid that flows through electric expansion valve is regulated and the actuator that is used to open or close valve section according to the electric expansion valve 1 of the utility model the first mode of execution.

Generally, electric expansion valve 1 comprises valve body 10.The upper opening 13 that is formed with the entrance 11 that is connected with inflow pipe 18, the outlet 12 that is connected with outflow tube 19 on the valve body 10 and is used for receiving supporting base 20.Be formed with valve opening 14 in the bottom of valve body 10.Valve opening 14 is communicated with to regulate from exporting the flow of 12 fluids of discharging with outlet 12 fluids.

Electric expansion valve 1 also comprises be used to the needle 15 of opening valve opening 14.Electric expansion valve 1 further comprises actuator's (will specifically describe hereinafter) of valve needle 15.In order to guide better needle 15 axial motions, in valve body 10, be provided with guide 16.Guide 16 has the through hole 16-1 that passes for needle and the equalizing orifice 16-2 that is used for providing in the up and down both sides of guide 16 the fluid connection.It will be understood by those skilled in the art that as required guide 16 is omissible.

In the electric expansion valve 1 according to the utility model the first mode of execution, actuator can comprise ut socket 60.Ut socket 60 comprises the inner chamber 61 for the reception needle 15 that slides.Needle 15 has the head 15-1 of increase.Be fixedly installed retaining ring 17 in the outlet port of inner chamber 61 with the axial displacement of restriction needle 15.Needle 15 can extend through retaining ring 17 to open and close valve opening 14.In addition, ut socket 60 also have internal thread segment 62 and be formed on internal thread segment 62 and inner chamber 61 between stepped part 63.Between the head 15-1 of stepped part 63 and needle 15, be provided with Compress Spring 64, with the axial displacement of adjusting needle 15 and the power of closing of close valve orifice 14, thereby avoid needle 15 or valve opening 14 to damage.In addition, can between the lower end of the stepped part 66 of the lower end of ut socket 60 and supporting base 20 Compress Spring 65 be set moves downward with auxiliary nut sleeve 60.

Actuator according to the utility model mode of execution can also comprise the main shaft 30 with external thread section 33.Main shaft 30 can also comprise the first paragraph 31 that cooperates with the rotor 50 of electric expansion valve 1 and diameter less than the second segment 32 of first paragraph 31, thereby is formed with stepped part 34 between first paragraph 31 and second segment 32.Can be with rotor 50 rotations thereby main shaft 30 is combined together with rotor 50 by first paragraph 31.Here, main shaft 30 can with rotor 50 secure fit together, also can be endwisely slipping but mode and the rotor 50 that can not rotate be combined together.

The external thread section 33 of main shaft 30 can be engaged in the internal thread segment 62 of ut socket 60.In addition, ut socket 60 is supported in the supporting base 20 so that but ut socket 60 can be in supporting base 20 interior slip can not be rotated with respect to supporting base 20.Supporting base 20 for example is threaded connection or other modes are fixedly installed in the upper opening 13 of valve body 10.

Supporting base 20 can comprise for the first portion 21 of ut socket 60 slips, for the recess of at least a portion that receives the bearing unit 40 that will describe the back and the through hole 23 that passes for main shaft 30.

Particularly, referring to shown in Figure 3, the first portion 21 of supporting base 20 has polygonal internal surface.Referring to Fig. 4, ut socket 60 has the polygonal outer surface that the polygonal internal surface with supporting base 20 matches.

Adopt above-mentioned structure, when electric expansion valve 1 work, rotor 50 will drive main shaft 30 rotations.Rotatablely moving of main shaft 30 is converted into the axial motion of ut socket 60 by the screw pair of main shaft 30 and ut socket 60, thereby can drive needle 15 axial motions to open or close valve opening 14.

According to the first mode of execution of the present utility model, in supporting base 20, be provided with the bearing unit 40 for the axial displacement of restriction main shaft 30.

Particularly, as illustrated in fig. 1 and 2, bearing unit 40 can comprise: be fixed on fixed block 41 on the second segment 32 of main shaft 30, be arranged on the bearing 42 between the stepped part 34 of fixed block 41 and main shaft 30 and be fixed on the supporting base and against the maintenance lid 43 of the upper surface of bearing 42.Fixed block 41 can be the nut that is screwed on the second segment 32 of main shaft 30.In this case, can outside thread be set in the part of the second segment 32 of main shaft 30.When main shaft 30 rotated, fixed block 41 can rotate in the through hole 23 of for example supporting base 20 with main shaft 30.In addition, keeping covering 43 can be fixed on the supporting base 20 via the mode that is threaded or other are suitable.At this moment, can outside thread be set at the outer surface of supporting base 20.Bearing 42 can be sliding bearing, is preferably ceramic slide bearing to improve the stability of its wear resistance and friction factor.Bearing 42 be received in the recess 22 of supporting base 20 so that the lower surface of bearing 42 against the bottom surface of recess 22, and the upper surface of bearing 42 is against keeping covering 43 lower surface, thus the axial displacement of bearing 42 and radial displacement are limited.

On the other hand, the lower surface of bearing 42 can be against the end face of fixed block 41, and the upper surface of bearing 42 can be against the stepped part 34 of main shaft 30.Because bearing 42 is supported seat 20 and keeps covering 43 and fixes, so the axial displacement of main shaft 30 is limited by stepped part 34 and fixed block 41.In other words, in the operation process of electric expansion valve 1, stepped part 34 or the fixed block 41 of axial force by main shaft 30 that acts on the main shaft 30 owing to the reaction force of thread screw mechanism is delivered to bearing 42, and then the fixed component that is delivered to electric expansion valve for example supporting base 20 and valve body 10, thereby effectively avoided rotor 50 to bear axial force.

Particularly, can be with respect to rotor 50 in axial sliding in the situation at main shaft 30, bearing 42, stepped part 34, fixed block 41, keep covering 43 and the accuracy of manufacturing of supporting base 20 and fit tolerance do not need very highly, this greatly reduces manufacturing and the assembly cost of electric expansion valve.For example, when having the gap owing to error between bearing 42 and stepped part 34 or bearing 42 and fixed block 41, main shaft 30 can move up or down certain distance to compensate this gap, still can be with axial force transmission to rotor 50.

Also comprise the fixture 71 that is installed on the valve body 10 according to electric expansion valve 1 of the present utility model, the stator module 72 that is used for driving rotor 50 that is fixed on the sealing cover 70 on the fixture 71 and is arranged on sealing cover 70 outsides.Sealing cover 70 is fixed together by fixture 71 and valve body 10 sealings, thereby forms an airtight space.By stator module 72 being arranged on sealing cover 70 outsides, can effectively reduce owing to the possibility that causes leakage that is electrically connected between stator module and the external power supply.Another side can be so that the general arrangement of electric expansion valve be more flexible.

As mentioned above, in the operation process of electric expansion valve 1, stator module 72 drives rotor 50, and rotor 50 drives main shaft 30 rotations, and rotatablely moving of main shaft 30 is converted into the axial motion of ut socket 60 by screw pair.Thereby ut socket 60 drives needle 15 and moves up or down to open valve opening 14.Particularly, ut socket 60 moves downward or upward and can be delivered to bearing 42 by the stepped part 34 on the main shaft 30 or fixed block 41 to the reaction force (axial force) that main shaft 30 applies, and then is delivered to supporting base 20 and valve seat 10.Therefore, in the whole process of electric expansion valve 1 running, rotor 50 can not bear any axial force.

In addition, fixed block 41 can be fixed on the main shaft 30 by for example being threaded, and keeping cover 43 can be fixed on the bearing support 20 by for example being threaded, so running in bearings assembly 40 easily.

Below with reference to the electric expansion valve of Fig. 5-7 description according to the utility model the second mode of execution.In the second mode of execution, adopted the reference character identical with the first mode of execution to refer to identical parts, so the description of these same parts will be omitted.

The second mode of execution is the structure of supporting base and the means of fixation of bearing unit with respect to the main distinction of the first mode of execution, and the anti-rotation structure of ut socket.

Particularly, in the second mode of execution, supporting base 120 can comprise separate left side 120A and right-hand part 120B.By being combined, left side 120A and right-hand part 120B form complete supporting base 120.Ut socket 60 can form the first portion 121 that holds ut socket 60 in the supporting base 120 so that can axially slide and can not rotate in first portion 121.For example, with reference to Fig. 7, ut socket 60 can have columniform outer surface, but is formed with planar surface portion 67 at this outer surface.Correspondingly, the first portion 121 of supporting base 120 can have columniform internal surface, but is formed with planar surface portion corresponding with planar surface portion 67 or that match at this internal surface.

In addition, can be formed for keeping the groove 122 of bearing 42 among the left side 120A of supporting base 120 and the right-hand part 120B, so that the axial motion of bearing 42 is limited by groove 122.

According to the second mode of execution, the upper surface of bearing 42 can fix by the stepped part 34 against main shaft 30, and the lower surface of bearing 42 can fix by the fixed block 41 of for example snap ring.Snap ring as fixed block 41 can be fixed in the groove 35 of main shaft 30.

After this, one of them half one that the ut socket 60 that is fixed with the main shaft 30 of bearing 42 and is equipped with needle 15 etc. can be arranged on together supporting base 120 is for example among the 120A of left side, so that bearing 42 is positioned in the groove 122, in the ut socket location in the first portion 121.Then, can close another half one for example right-hand part 120B so that 120 one-tenth of supporting bases are as a whole.After this, whole supporting base 120 can for example be threaded connection and be fixed in the valve body 10.In order to guarantee that further supporting base 120 tops can not separate, snap ring 123 can be set on the top of supporting base 120.

Can realize the effect identical with the first mode of execution according to the electric expansion valve of the utility model the second mode of execution.In addition, because supporting base adopts the design of split left and right formula, the assembling of each parts is more prone to.

The above has described two kinds of mode of executions of the present utility model, but is appreciated that those skilled in the art can make other remodeling under teaching of the present utility model.For example, the structure of the first mode of execution can combine with the structure of the second mode of execution, for example replaces the nut as fixed block 41 in the first mode of execution with the snap ring as fixed block 41 in the second mode of execution.

In addition, the structure that permission axial motion between supporting base and the ut socket does not still allow to rotate also is not limited to above-mentioned mode of execution, but can carry out various remodeling, for example can at least one steering channel be set in the interior perimeter surface of supporting base, and the projection that cooperates with steering channel the setting of the outer surface of ut socket.Perhaps, can projection be set in the interior perimeter surface of supporting base, and the steering channel that cooperates with described projection the setting of the outer surface of ut socket.Again for example, supporting base can have non-circular interior perimeter surface, and ut socket can have the non-circular outer surface that mates with the non-circular interior perimeter surface of supporting base.

Although described various mode of execution of the present utility model in detail at this, but should be appreciated that the utility model is not limited to the embodiment of describing in detail and illustrating here, in the situation that does not depart from essence of the present utility model and scope, can be realized by those skilled in the art other modification and variant.All these modification and variant all fall in the scope of the present utility model.And all members described here can be replaced by the member that is equal on the other technologies.

Claims

1. an electric expansion valve (1) comprising:

Valve body (10);

Be fixedly installed on the supporting base (20,120) on the described valve body (10);

The main shaft (30) that is supported in rotating mode by described supporting base (20,120);

It is characterized in that: in described supporting base (20,120), be provided with the bearing unit (40) be used to the axial displacement that limits described main shaft (30).

2. electric expansion valve as claimed in claim 1 (1), wherein said main shaft (30) comprises that the first paragraph (31) that cooperates with the rotor (50) of described electric expansion valve (1) and diameter less than the second segment (32) of described first paragraph (31), are formed with stepped part (34) between described first paragraph (31) and described second segment (32).

3. electric expansion valve as claimed in claim 2 (1), wherein said bearing unit (40) comprising: be fixed on fixed block (41) on the second segment (32) of described main shaft (30), be arranged on the bearing (42) between the stepped part (34) of described fixed block (41) and described main shaft (30) and be fixed on described supporting base (20) upper and against the maintenance lid (43) of the upper surface of described bearing (42).

4. electric expansion valve as claimed in claim 3 (1), wherein said fixed block (41) is the nut on the second segment (32) that is screwed in described main shaft (30).

5. electric expansion valve as claimed in claim 3 (1), wherein said fixed block (41) is arranged in the described supporting base (20) in rotating mode.

6. electric expansion valve as claimed in claim 3 (1), wherein said maintenance lid (43) is fixed on via being threaded on the described supporting base (20).

7. electric expansion valve as claimed in claim 2 (1), wherein said supporting base (120) comprises separate left side (120A) and right-hand part (120B).

8. electric expansion valve as claimed in claim 7 (1), the bottom of wherein said left side (120A) and described right-hand part (120B) is kept by described valve body (10), and the top of described left side (120A) and described right-hand part (120B) is kept by snap ring (123).

9. electric expansion valve as claimed in claim 7 (1), wherein said bearing unit (40) comprises fixed block (41) on the second segment (32) that is fixed on described main shaft (30), be arranged on the bearing (42) between the stepped part (34) of described fixed block (41) and described main shaft (30), and

Be formed be used to the groove that keeps described bearing (42) (122) in described left side (120A) and the described right-hand part (120B).

10. electric expansion valve as claimed in claim 9 (1), wherein said fixed block (41) are arranged on the snap ring on the second segment (32) of described main shaft (30).

11. such as each described electric expansion valve (1) among the claim 1-10, further comprise and in described supporting base, axially to slide but the ut socket (60) that can not rotate.

12. electric expansion valve as claimed in claim 11 (1), wherein said supporting base has polygonal internal surface, and described ut socket (60) has the polygonal outer surface that the polygonal internal surface with described supporting base matches.

13. electric expansion valve as claimed in claim 11 (1), the outer surface of wherein said ut socket (60) has planar surface portion (67), and the internal surface of described supporting base has the planar surface portion that the planar surface portion with described ut socket matches.

14. electric expansion valve as claimed in claim 11 (1) has internal thread segment (62) in the wherein said ut socket (60), described main shaft (30) has the external thread section (33) that matches with described internal thread segment.

15. electric expansion valve as claimed in claim 11 (1), slidably be provided with needle (15) in the wherein said ut socket (60), described needle (15) is used to open or close the valve opening (14) in the described valve body (10).

16. electric expansion valve as claimed in claim 15 (1) further comprises the guide (16) for the described needle of axial lead (15).

17. such as each described electric expansion valve (1) among the claim 2-10, wherein said main shaft (30) is engaged in the described rotor (50) in the mode that still can not rotate that can endwisely slip.

18. such as claim 3 or 9 described electric expansion valves (1), wherein said bearing (42) is sliding bearing.