CN203189758U

CN203189758U - Flow control valve

Info

Publication number: CN203189758U
Application number: CN201220567518XU
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Co Ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2012-10-31
Filing date: 2012-10-31
Publication date: 2013-09-11
Anticipated expiration: 2022-10-31

Abstract

The utility model discloses a flow control valve which comprises a valve seat (5) and a housing (1) that is connected with the valve seat (5). The housing (1) is internally provided with a motor (2). The motor (2) is connected with a lead screw (6) through an output shaft. The lead screw (6) is connected with a nut (41) through threaded matching. The nut (41) is connected with a valve rod (42). The valve rod (42) adjusts the opening degree of the valve port on the valve seat (5). The flow control valve is characterized in that: the valve rod (42) is internally provided with a mounting chamber (42a); the whole body or the lower body of the nut (41) is fitted in the mounting chamber (42a) through radial clearance fit; the mounting chamber (42a) is internally provided with a positioning component; and the positioning component is fixedly connected with the valve rod (42) for realizing axial limiting to the nut (41). The designed structure of the flow control valve can eliminate coaxiality between the lead screw and the nut caused by component machining and eliminating on one hand, and on the other hand, the designed structure can improve axial spacing reliability of the nut.

Description

A kind of flow control valve

Technical field

The utility model relates to the fluid control component technical field, particularly a kind of flow control valve.

Background technique

Flow control valve is the vitals of forming refrigeration system, is another basic element of character of removing in four basic elements of character of refrigeration system outside vaporizer, compressor and the condenser.The working procedure of flow control valve is generally: along with energising or the outage of coil device, needle is regulated the aperture of valve port, thereby regulates the flow of refrigeration agent.In addition, also there is application widely in flow control valve in other fluid control fields such as hydraulic system and oil transportation.

In the prior art, the patent No. is that 200580023202.7 Chinese patent discloses a kind of flow control valve; Particularly, please refer to Fig. 1 and Fig. 2, Fig. 1 is the structural representation of a kind of flow control valve in the prior art, and Fig. 2 is the partial enlarged drawing of flow control valve among Fig. 1.

As shown in Figure 1, the inside of electric machine casing 62 is provided with motor 70, and the lower case 60 of this electric machine casing 62 is connected in the head 48 by screw-thread fit.As shown in Figure 2, valve cell 40 comprises that bleed piston 130(is equivalent to nut), this bleed piston 130 has internal thread, is used for holding having externally threaded live axle 78(and being equivalent to screw mandrel).This bleed piston 130 is extended long length vertically, and is slidably mounted in the sleeve pipe 146, and this sleeve pipe 146 is installed in the lower case 60.Bleed piston 130 can not circumferentially be rotated by sleeve pipe 146 restrictions, when motor 70 drives when having externally threaded live axle 78 rotations by gear train, because bleed piston 130 can not circumferentially rotate, thereby can only axial motion, and then drive the aperture of valve port on valve cell 40 regulating valve seats 22.Yet flow control valve has following defective in the prior art:

The first, valve cell 40 comprises back part 94, and this back part 94 is connected in the intermediate member 96 by screw-thread fit, thereby bleed piston 130 is carried out axial limiting; As shown in Figure 2, because little valve port 120b need be closed or open to bleed piston 130, thereby bleed piston 130 can not rock diametrically, that is bleed piston 130 is very close to each other diametrically with back part 94 or intermediate member 96, otherwise can influence the sealability of the little valve port 120b of sealing.The processing of each component of valve body and assembling can bring bigger coaxiality error, make to have bigger coaxiality error between live axle 78 and the bleed piston 130, owing to bleed piston 130 can not radially shake, thereby are easy to cause live axle 78 stuck;

The second, back part 94 and intermediate member 96 are connected by screw-thread fit, along with bleed piston 130 and valve cell 40 in the process of motion vertically, screw-thread fit takes place loosening easily, the reliability that causes bleed piston 130 is carried out axially locating is lower;

The 3rd, bleed piston 130 need be fixed in the sleeve pipe 146 of lower case 60, limit it by this sleeve pipe 146 and can not circumferentially rotate, thereby bleed piston 130 need stretch out enough length from valve cell 40, in order to stretch in this sleeve pipe 146; This kind structural design makes the live axle 78 that cooperates with bleed piston 130 also have bigger length, cause the winding degree of live axle 78 big, coaxality when bleed piston 130 is assembled with live axle 78 is difficult to guarantee, if dress can increase resisting moment partially, even causes live axle 78 stuck;

The 4th, as indicated above, bleed piston 130 need be stretched out enough length from valve cell 40, in order to stretch in this sleeve pipe 146, correspondingly, can cause live axle 78 and lower case 60 to have bigger length vertically, thereby causes cost of material to increase.

In order to eliminate screw mandrel that component processing and assembling bring and the coaxiality error between the nut, and the reliability of raising nut axial limiting, it is the patent application of 201120220419.X that the claimant has submitted application number on June 27th, 2011, a kind of flow control valve of new structure is provided, has comprised valve seat and be connected in housing on the valve seat; The inside of housing is provided with motor, and motor is connected with screw mandrel by its output shaft, and screw mandrel is connected with nut by screw-thread fit, and nut is connected with valve rod, and valve rod is the aperture of the valve port on the motion regulating valve seat vertically; The inside of valve rod is provided with the installation cavity, the bottom of the whole or described nut of nut radially Spielpassung in cavity is installed; Install on the inwall of cavity and offer annular spacing groove, be provided with in the annular spacing groove described nut is carried out axial limiting and Spielpassung in the limit position part of described nut outside.The flow control valve of this structure offers annular spacing groove at the inwall that cavity is installed, be installed with limit position part in this annular spacing groove, by this limit position part nut is carried out axial limiting, this kind limit structure can avoid screw-thread fit to connect the loosening problem that causes, thereby this kind structure is improved to the reliability that nut carries out axial limiting, screw mandrel that component processing and assembling bring and the coaxiality error between the nut can be eliminated on the one hand, the reliability of nut axial limiting can be improved on the other hand.

But the flow control valve of this structure need be offered annular spacing groove at the inwall that cavity is installed, and collar and back-up ring is set to realize better technique effect in restraining groove, and parts are many relatively, and limit structure is comparatively complicated.

The application is further optimization and the improvement of having done on 201120220419.X patent basis, realizes same technique effect with less components.

The model utility content

The technical problems to be solved in the utility model is for providing a kind of flow control valve, the structural design of this flow control valve can be eliminated screw mandrel that component processing and assembling bring and the coaxiality error between the nut on the one hand, can improve the reliability of nut axial limiting on the other hand.

For solving the problems of the technologies described above, the utility model provides a kind of flow control valve, comprises valve seat and is connected in housing on the valve seat; The inside of described housing is provided with motor, and described motor is connected with screw mandrel by its output shaft, and described screw mandrel is connected with nut by screw-thread fit, and described nut is connected with valve rod, and described valve rod moves vertically and regulates the aperture of the valve port on the described valve seat; It is characterized in that the inside of described valve rod is provided with the installation cavity, the bottom of the whole or described nut of described nut radially Spielpassung in described installation cavity; Also be provided with positioning element in the described installation cavity, fixedly connected to realize the axial limiting to described nut between described positioning element and the described valve rod.

Preferably, has the gap between the inwall of described nut and described installation cavity.

Preferably, described valve rod comprise metal sleeve and with described metal sleeve injection moulding all-in-one-piece injection molding body, described positioning element is fixedlyed connected with described metal sleeve.

Preferably, the wall thickness of the auxiliary section of described metal sleeve is greater than the wall thickness of main part, and described positioning element is fixedlyed connected with described auxiliary section.

Alternatively, described positioning element is fixedlyed connected by the mode of interference fit with described metal sleeve.

Alternatively, described positioning element is fixedlyed connected by the mode of welding with described metal sleeve.

Preferably, has the gap between described positioning element and the described nut.

Preferably, described positioning element is positioning ring, and described positioning ring is circular, and is provided with the inclined-plane.

Alternatively, described positioning element is that the cross section is "T"-shaped location piece.

Preferably, on the diapire of described installation cavity and on the diapire of described nut, one offer circumferential restraining groove, and another person is provided with spacing bump, and described spacing bump is located in the described circumferential restraining groove.

On the basis of existing technology, the inside of the valve rod of flow control valve provided by the utility model is provided with the installation cavity, the bottom of the whole or described nut of described nut radially Spielpassung in described installation cavity; Also be provided with positioning element in the described installation cavity, fixedly connected to realize the axial limiting to described nut between described positioning element and the described valve rod.In the utility model, because positioning element and nut be Spielpassung diametrically, and also has the gap between nut and the valve rod, thereby the assembling finish after, nut can be under the drive of screw mandrel, rock in radially little gap in valve rod, thereby can eliminate nut that component processing and assembling bring and the coaxiality error between the screw mandrel, and then can avoid the generation of screw mandrel stuck phenomenon.

In addition, in the utility model, owing to install in the cavity and also be provided with positioning element, fixedly connected to realize the axial limiting to described nut between described positioning element and the described valve rod, and positioning element is fixed by mode and the valve rod of interference fit or welding, this limit structure can avoid screw-thread fit to connect the loosening problem that causes, thereby this kind structure is improved to the reliability that nut carries out axial limiting.

Description of drawings

Fig. 1 is the structural representation of a kind of flow control valve in the prior art;

Fig. 2 is the partial enlarged drawing of flow control valve among Fig. 1;

Fig. 3 is the structural representation of flow control valve among first kind of embodiment of the utility model;

Fig. 4 is the structural representation of the valve rod parts of flow control valve among Fig. 3;

Fig. 5 is the sectional view of valve rod parts among Fig. 4;

Fig. 6 is the explosive view of valve rod parts among Fig. 5;

Fig. 7 is the partial enlarged drawing at the I position of valve rod parts among Fig. 5;

Fig. 8 is the structural representation of valve rod parts among second kind of embodiment of the utility model;

Wherein, the corresponding relation between reference character and the component names is among Fig. 1 and Fig. 2:

The 62-electric machine casing; The 70-motor; The 48-head; The 40-valve cell; The 130-bleed piston; The 78-live axle; The 146-sleeve pipe; The 60-lower case; The 22-valve seat; The 94-back part; The 96-intermediate member; The little valve port of 120b-.

Corresponding relation among Fig. 3 to Fig. 8 between reference character and the component names is:

The 1-housing; The 2-motor; The 3-gear train; 4-valve rod parts; The 5-valve seat; The 6-screw mandrel;

The 41-nut; The spacing bump of 41a-; The 42-valve rod; 42a-installs cavity; The 42b-injection molding body; The 42c-circular hole; The circumferential restraining groove of 42d-; The 42e-metal sleeve; The 42e1-auxiliary section; The 42e2-main part; The 42f-limit stoper; 411-limit dais terrace; The 412-screw thread; The 43-positioning ring; The 431-inclined-plane; The 44-location piece; 441-location piece main part; 442-location piece flanging portion.

Embodiment

In order to make those skilled in the art understand the technical solution of the utility model better, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Please also refer to Fig. 3 to Fig. 7, Fig. 3 is the structural representation of flow control valve among first kind of embodiment of the utility model, Fig. 4 is the structural representation of the valve rod parts of flow control valve among Fig. 3, Fig. 5 is the sectional view of valve rod parts among Fig. 4, Fig. 6 is the explosive view of valve rod parts among Fig. 5, and Fig. 7 is the partial enlarged drawing at the I position of valve rod parts among Fig. 5.

In the first embodiment, flow control valve provided by the utility model, comprise valve seat 5 and be connected in housing 1 on the valve seat 5, be provided with motor 2 in the housing 1, the output shaft of motor 2 is in transmission connection with screw mandrel 6 by the gear train 3 that is supported on the pinion stand, thereby screw mandrel 6 rotates along with the output shaft of motor 2; Screw mandrel 6 is connected with nut 41 by screw-thread fit, and nut 41 is connected with valve rod 42, and along with the output shaft rotation of motor 2, screw mandrel 6 rotates, and screw mandrel 6 and then drive valve rod 42 move vertically, thus the aperture of the valve port on valve rod 42 regulating valve seats 5.

The inside of valve rod 42 is provided with installs cavity 42a, the bottom that cavity 42a is installed also is provided with circumferential restraining groove 42d, the bottom of nut 41 integral body or nut 41 radially Spielpassung namely arranges the gap between the inwall of nut 41 and installation cavity 42e in cavity 42a is installed.The existence in this gap makes nut 41 radially to rock in valve rod 42 within the specific limits, thereby eliminates the coaxiality error that causes in the assembly process to a certain extent.Nut 41 is step-like hollow cylinder substantially, and its periphery wall can arrange some relief grooves vertically, and its inwall is provided with screw thread 412, is used for and screw mandrel 6 composition screw thread kinematic pair.Be provided with spacing bump 41a in the bottom of nut 41, spacing bump 41a matches with the circumferential restraining groove 42d that cavity 42a bottom is installed, and when nut 41 was mounted to valve rod 42, both circumferentially can not rotate mutually like this.

In the present embodiment, spacing bump 41a is arranged on the bump along the diametric(al) extension of nut 41 bottoms, and is corresponding with it, and circumferentially restraining groove 42d is arranged on the edge of installation cavity 42a bottom to the groove that extends.Under the enlightenment of the technical program; those skilled in the art can make limit structure between the two certainly and being equal to or similarly change; change as the shape to spacing bump; the circumferential restraining groove of corresponding change simultaneously adapts to it; these changes all can make two parts cooperate to realize relative fixed, should belong within the protection domain of the present utility model.

Valve rod 42 can in the present embodiment, be that injection moulding one deck injection molding body 42b forms on the basis of metallic sleeve pipe 42e by molding and forming.In order to make both strong bonded, some circular hole 42c can be set at the perisporium of sleeve pipe 42e, like this, when injection moulding, plastic material can be filled in the circular hole 42c, makes injection molding body 42b can not relatively rotate with metal sleeve pipe 42e.Wherein, injection molding body 42b is substantially cylindrical, and, be formed with the limit stoper 42f of two evaginations in its tip portion, be used for pinion stand on position-limited shaft carry out circumferentially spacing.

Simultaneously, in the present embodiment, the auxiliary section 42e1 that metal sleeve 42e comprises main part 42e2 and is positioned at main part 4,2e2 one end, wherein, the wall thickness of auxiliary section 42e1 is greater than the wall thickness of main part 42e2, like this, when injection moulding was finished, the inwall of the installation cavity 42e that valve rod 42 forms can keep essentially identical internal diameter, and, because auxiliary section 42e1 need be used for and positioning element hereinafter described welds or rivets, and also can increase the intensity of valve rod.

The utility model also comprises a positioning element, and in the present embodiment, positioning element is specially the metal circular positioning ring 43 that is substantially.As shown in Figure 6, the cross section of positioning ring is rectangular shape substantially, and the inwall of one end thereof is provided with an inclined-plane 431.

The upper end of nut 41 also is provided with limit dais terrace 411, and limit dais terrace 411 is preferably the conical surface, and in the time of in nut is installed in installation cavity 42e, positioning ring 43 is fixed with auxiliary section 42e1.Can make like this when coming in contact between inclined-plane 431 and the limit dais terrace 411, be the line contact condition, rather than the face contact, area of contact is little, can reduce the resistance that nut 41 generations are radially rocked.

In when assembling, among the installation cavity 42a of the valve rod 42 of earlier nut 41 being packed into, and by the relative positioning of realizing both that cooperates between spacing bump 41a and the circumferential restraining groove 42d; The positioning ring 43 of packing into then, the thickness of positioning ring 43 is set to when it cooperates fixedly with auxiliary section 42e1, has certain clearance between its inwall and the nut 41.This gap is not to be two gaps that parts cooperate nature to form on the common meaning, but the special setting of this programme, the size in its gap can guarantee to make nut 41 radially to rock in valve rod 42 within the specific limits, thereby eliminates the coaxiality error that causes in the assembly process to a certain extent.

Can adopt the mode of interference fit to fix between positioning ring 43 and the auxiliary section 42e1, also can adopt the mode of welding to fix, in order to increase the technique effect of welding, also can carry out interference fit earlier, it is fixing to implement welding again after again.

Like this, nut 41 has just been realized axial location, and in axially locating, since the bottom of nut 41 integral body or nut 41 radially Spielpassung in cavity 42a is installed, and also be Spielpassung between positioning ring 43 and the nut 41, thereby the assembling finish after, nut 41 can be under the drive of screw mandrel 6, rock in radially little gap in valve rod 42, thereby can eliminate nut 41 that component processing and assembling bring and the coaxiality error between the screw mandrel 6, and then can avoid the generation of screw mandrel 6 stuck phenomena.

Obviously, this limit structure can avoid screw-thread fit to connect the loosening problem that causes, thereby this kind structure is improved to the reliability that nut 41 carries out axial limiting.

Below in conjunction with accompanying drawing 8, second mode of execution of the present utility model is described.Fig. 8 is the sectional view of valve rod parts among second kind of embodiment of the utility model.

In second mode of execution, the parts identical with first mode of execution can be given unnecessary details no longer one by one with reference to above describing, and only just between the two difference describes.

In the present embodiment, positioning element is location piece 44, and location piece 44 comprises a location piece main part 441, and with the integrated location piece flanging of main part 441 portion 442, like this, it is "T"-shaped that the cross section of location piece 44 is substantially.The advantage of this structure is to improve intensity, and because angle is big to rectangular between flanging portion 442 and the main part 441, when location piece 44 is fit into valve rod 42, flanging portion 442 is connected on the end face of auxiliary section 42e1, can realize the location at axial direction to location piece 44, namely with respect to first mode of execution, can realize the location more accurately.

In when assembling, among the installation cavity 42a of the valve rod 42 of earlier nut 41 being packed into, and by the relative positioning of realizing both that cooperates between spacing bump 41a and the circumferential restraining groove 42d; The location piece 44 of packing into then, the flanging portion 442 of location piece 44 is connected on the end face of auxiliary section 42e1, the inwall interference fit of location piece main part 441 and auxiliary section 42e1, like this, just nut 41 has been realized axial spacing, and in axial limiting, since the bottom of nut 41 integral body or nut 41 radially Spielpassung in cavity 42a is installed, and have a mind to be provided with the gap between location piece 44 and the nut, thereby the assembling finish after, nut 41 can be under the drive of screw mandrel 6, rock in radially little gap in valve rod 42, thereby can eliminate nut 41 that component processing and assembling bring and the coaxiality error between the screw mandrel 6, and then can avoid the generation of screw mandrel 6 stuck phenomena.

In above-mentioned two kinds of mode of executions, valve rod adopts metal sleeve and injection molding body in conjunction with making, and positioning element adopts metal to make, and adopts the mode of welding, interference fit or both combinations to fix to being metal sleeve pipe and positioning element then.Under enlightenment of the present utility model, can also make substituting of various technological means, such as the whole of valve rod or part employing plastics, corresponding positioning element also adopts plastics to make, both fix by the ultrasonic welding mode then, and this mode can reduce cost, simplify technology.Also can adopt riveted joint or other combination in addition between valve rod and the positioning element, only need to realize the axial limiting of nut is got final product, simultaneously can also make positioning element and valve rod at axial restraint, and radially can relatively rotate, can realize technique effect of the present utility model equally.

More than a kind of flow control valve provided by the utility model is described in detail.Used specific case herein principle of the present utility model and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present utility model and core concept thereof.Should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.

Claims

1. flow control valve comprises valve seat (5) and is connected in housing (1) on the valve seat (5); The inside of described housing (1) is provided with motor (2), described motor (2) is connected with screw mandrel (6) by its output shaft, described screw mandrel (6) is connected with nut (41) by screw-thread fit, described nut (41) is connected with valve rod (42), and described valve rod (42) moves vertically and regulates the aperture of the valve port on the described valve seat (5); It is characterized in that the inside of described valve rod (42) is provided with installs cavity (42a), the bottom of the whole or described nut (41) of described nut (41) radially Spielpassung in described installation cavity (42a); Also be provided with positioning element in the described installation cavity (42a), fixedly connected to realize the axial limiting to described nut (41) between described positioning element and the described valve rod (42).

2. flow control valve as claimed in claim 1 is characterized in that, has the gap between the inwall of described nut (41) and described installation cavity (42a).

3. flow control valve as claimed in claim 2, it is characterized in that, described valve rod (42) comprise metal sleeve (42e) and with described metal sleeve (42e) injection moulding all-in-one-piece injection molding body (43b), described positioning element is fixedlyed connected with described metal sleeve (42e).

4. flow control valve as claimed in claim 3 is characterized in that, the wall thickness of the auxiliary section (42e1) of described metal sleeve (42e) is greater than the wall thickness of main part (42e2), and described positioning element is fixedlyed connected with described auxiliary section (42e1).

5. flow control valve as claimed in claim 4 is characterized in that, described positioning element is fixedlyed connected by the mode of interference fit with described metal sleeve (42e).

6. flow control valve as claimed in claim 4 is characterized in that, described positioning element is fixedlyed connected by the mode of welding with described metal sleeve (42e).

7. flow control valve as claimed in claim 3 is characterized in that, has the gap between described positioning element and the described nut (41).

8. flow control valve as claimed in claim 2 is characterized in that, described valve rod (42) is plastics with described positioning element, and both are fixedly connected by the ultrasonic welding mode.

9. flow control valve as claimed in claim 1 is characterized in that, described positioning element is positioning ring (43), and described positioning ring (43) is circular, and its inwall is provided with inclined-plane (431).

10. flow control valve as claimed in claim 9 is characterized in that, described positioning element is that the cross section is "T"-shaped location piece (44).