CN113108073A

CN113108073A - Air throttle valve

Info

Publication number: CN113108073A
Application number: CN202110538017.2A
Authority: CN
Inventors: 李战峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2021-07-13

Abstract

The invention relates to an air throttle valve, wherein an opening and closing needle of the air throttle valve performs axial displacement movement under the synergistic action of a sliding block, a screw rod and a knob so as to enter or exit a throttle passage. The sliding block is used for embedding the opening and closing needle, is arranged in the sliding cavity and can freely slide along the up-down direction. The knob is arranged right above the valve cover and used for driving the screw rod to perform circumferential rotation movement. When the knob is rotated, the screw rod rotates around the central axis of the knob in the circumferential direction, the relative height position of the screw rod is always kept at a fixed value, and the screw rod drives the sliding block to move axially by virtue of the thread pair. Therefore, on one hand, in the process of executing flow regulation, the distance value between the knob and the valve body is always kept unchanged, so that the requirement on the height value of the operation space above the valve body is effectively reduced; on the other hand, along with the advance of the flow regulation process, the exposed length of the screw rod is kept unchanged all the time, the observation is facilitated, and the probability that operators are subjected to the collision or hanging risks is reduced.

Description

Air throttle valve

Technical Field

The invention relates to the technical field of valve manufacturing, in particular to an air throttle valve.

Background

The air throttle valve is widely applied to industries such as petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmacy, water conservancy, electric power, municipal administration, steel and the like, and plays a significant role in national economy. The air throttle valve generally adopts a conical streamline opening and closing needle to control the flow, and the purpose of regulating the flow or the pressure is achieved by changing the sectional area of a channel in practical application.

Chinese patent No. CN 205446731U discloses a high pressure air throttle valve, as shown in fig. 1, which comprises a valve body, an O-ring, an adjusting screw and a lock nut. The valve body is provided with an air inlet hole, an air outlet hole and a throttling hole communicated with the air inlet hole. The throttle hole is communicated with the air outlet hole, and the adjusting screw is screwed on the valve body and is sealed with the valve body by an O-shaped sealing ring. The conical surface of one end of the adjusting screw is opposite to the throttling hole so as to adjust the flow. The locking nut is screwed on the adjusting screw to limit the adjusted adjusting screw. When the flow needs to be adjusted, the adjusting screw is rotated in the circumferential direction to make the adjusting screw perform displacement motion along the axial direction, and the size of the cross section of the channel is changed by the aid of the conical surface on the adjusting screw. As can be seen from the above description, when the flow rate is adjusted, the adjusting screw must perform axial displacement movement, which means that the distance between the adjusting screw and the valve body changes with the difference of the flow rate adjustment of the air throttle valve, and finally the requirement for the height value of the operating space above the valve body increases. In addition, along with the increase of the length value of the adjusting screw exposed out of the valve body, the sight is obstructed, and the risk that the human body is seriously damaged due to accidental collision or hanging of an operator is increased. Thus, a skilled person is urgently needed to solve the above problems.

Disclosure of Invention

Therefore, in view of the above-mentioned problems and disadvantages, the present inventors have collected relevant information, evaluated and considered in many ways, and continuously conducted experiments and modifications by technicians with many years of research and development experience in this field, which finally resulted in the appearance of the air throttle valve.

In order to solve the technical problem, the invention relates to an air throttle valve which comprises a valve body, an opening and closing needle, a sliding block, a screw rod and a knob. The valve body is of a split structure and comprises a valve seat and a valve cover which are butted into a whole. An air inlet, a transition cavity, an air outlet, an inserting and matching channel, a throttling channel and a sliding cavity are arranged in the valve seat. The transition cavity is formed inside the valve seat. The air inlet is formed by inward extension of the outer side wall of the valve seat and is communicated with the transition cavity. The air outlet is formed by upward extension of the bottom wall of the valve seat and is communicated with the transition cavity through the throttling channel. The sliding cavity is positioned right above the transition cavity and is formed by downwards extending the top wall of the valve seat. The inserting and matching channel is formed by continuously extending the bottom wall of the sliding cavity downwards until the inserting and matching channel is communicated with the transition cavity. The opening and closing needle is assembled in the inserting and assembling channel and performs axial displacement movement under the synergistic action of the sliding block, the screw rod and the knob so as to enter or depart from the throttling channel. The sliding block is used for embedding the opening and closing needle, is arranged in the sliding cavity and can freely slide along the up-down direction. The knob is arranged right above the valve cover and is riveted with the screw rod into a whole. When the knob is rotated, the screw rod rotates around the central axis of the knob in the circumferential direction, the relative height position of the screw rod is always kept at a fixed value, and the screw rod drives the sliding block to move axially by virtue of the thread pair.

As a further improvement of the technical scheme of the invention, the throttling channel is preferably formed by continuously and upwardly extending the top wall of the air outlet until the throttling channel is communicated with the transition cavity

As a further improvement of the technical scheme of the invention, the air throttle valve also comprises a limit pin. An annular limiting flange extends outwards from the peripheral side wall of the screw rod, and correspondingly, an accommodating groove for sinking the limiting flange extends downwards from the top wall of the valve cover. After the screw rod is inserted and matched in place relative to the valve cover, the annular limiting flange is just propped against the bottom wall of the accommodating groove, and the limiting pin is inserted into the accommodating groove, fixed in the accommodating groove and transversely arranged right above the annular limiting flange.

As a further improvement of the technical scheme of the invention, the distance between the central axis of the limit pin and the annular limit flange is d, and the d is less than 0.5 mm.

As a further improvement of the technical scheme of the invention, the valve body also comprises a bolt assembly. After the valve seat and the valve cover are matched, the valve seat and the valve cover are connected and fixed by the bolt component.

As another modified design of the technical scheme, the air throttle valve also comprises an anti-wear sleeve. The wear-resistant sleeve is embedded in the valve seat and arranged between the transition cavity and the air outlet. The throttling channel is directly arranged in the wear-resistant sleeve.

As a further improvement of the technical scheme of the invention, the air throttle valve also comprises an elastic member. The elastic piece is arranged in the sliding cavity and always applies an elastic force to the bottom wall of the sliding block.

As a further improvement of the technical solution of the present invention, the elastic member is preferably a cylindrical spring.

As a further improvement of the technical scheme of the invention, the air throttle valve also comprises a sealing ring. An accommodating cavity for placing the sealing ring is extended downwards from the bottom wall of the sliding cavity. When the opening and closing needle is inserted and matched in place relative to the insertion and matching channel, the sealing ring is arranged in the accommodating cavity and is sleeved on the opening and closing needle. The sealing ring is elastically extruded between the elastic piece and the bottom wall of the containing cavity, and the sealing ring is adaptively and elastically deformed to seal the outer side wall of the opening and closing needle.

As a further improvement of the technical scheme of the invention, the air throttle valve also comprises a locking nut. The locking nut is arranged between the knob and the valve cover and screwed on the valve cover by virtue of the thread pair. After the air throttle valve is adjusted in place, the locking nut is continuously rotated until the locking nut is completely abutted against the knob, and the circumferential rotation freedom degree of the knob is limited.

Compared with the air throttle valve with the traditional design structure, in the technical scheme disclosed by the invention, when the adjustment of the flow cross section of the throttle channel is carried out, only the opening and closing needle carries out axial displacement motion, and the screw rod used for driving the opening and closing needle only carries out circumferential rotation motion under the matching action of the sliding block, so that the axial relative height position of the screw rod is always kept unchanged. Therefore, on one hand, in the process of executing flow regulation, the distance value between the knob and the valve body is always kept unchanged, so that the requirement on the height value of the operation space above the valve body is effectively reduced; on the other hand, in view of the fact that the screw rod only executes circumferential rotation motion in the process of driving the opening and closing needle, the phenomenon that the exposed length of the screw rod is increased along with the propelling of the flow adjusting process cannot occur necessarily, observation is facilitated, and the probability that operators are collided or hung is reduced as far as possible.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a high pressure air throttle valve in the prior art.

Fig. 2 is a side view of a first embodiment of the air restriction valve of the present invention.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is a schematic view showing the structure of a valve seat in the first embodiment of the air throttle valve of the present invention.

Fig. 5 is a schematic structural view of a valve cover in the first embodiment of the air throttle valve of the present invention.

Fig. 6 is a side view of a second embodiment of the air restriction valve of the present invention.

Fig. 7 is a side view of a third embodiment of the air restriction valve of the present invention.

Fig. 8 is a schematic view showing the structure of a valve seat in a third embodiment of the air throttle valve of the present invention.

Fig. 9 is a side view of a fourth embodiment of the air restriction valve of the present invention.

Fig. 10 is a sectional view B-B of fig. 9.

1-a valve body; 11-a valve seat; 111-an air inlet; 112-a transition chamber; 113-gas outlet; 114-mating channels; 115-a throttling channel; 116-a glide cavity; 1161-a containment chamber; 12-valve cover; 121-a receiving recess; 13-a bolt assembly; 2-opening and closing the needle; 3-a sliding block; 4-screw rod; 41-annular position-limiting flange; 5-a knob; 6-a limit pin; 7-wear-resistant sleeve; 8-a cylindrical spring; 9-sealing ring; and 10, locking the nut.

Detailed Description

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The technical solution disclosed by the present invention is explained below by referring to an example, and fig. 2 and fig. 3 respectively show a side view and a sectional view a-a of a first embodiment of the air throttle valve according to the present invention, and it can be seen that the air throttle valve mainly comprises a valve body 1, an opening and closing needle 2, a sliding block 3, a screw 4, a knob 5 and the like. As shown in the figure, the valve body 1 is a split structure and comprises a valve seat 11, a valve cover 12 and a bolt assembly 13. When the valve seat 11 and the valve cover 12 are completely butted, the two are detachably connected by the bolt assembly 13. As shown in fig. 4, an air inlet 111, a transition chamber 112, an air outlet 113, a plug-in passage 114, a throttle passage 115, and a slide movement chamber 116 are provided in the valve seat 11. Wherein the transition chamber 112 is formed inside the valve seat 11. The inlet 111 extends inwardly from the outer side wall of the valve seat 11 and is connected to the transition chamber 112. The air outlet 113 extends upward from the bottom wall of the valve seat 11 and is communicated with the transition chamber 112 via a throttling channel 115. The throttling channel 115 is formed by the top wall of the air outlet 113 continuing to extend upwards and is communicated with the transition cavity 112. In view of reducing leakage and the swinging amount of the opening and closing needle 2 during axial displacement as much as possible, the inner diameter value of the throttling channel 115 is matched with the outer diameter value of the opening and closing needle 2, and the unilateral clearance after assembly is controlled within 0.05 mm. The sliding chamber 116 is located right above the transition chamber 112 and is formed by extending the top wall of the valve seat 11 downward. The mating passage 114 is formed by the bottom wall of the slide cavity 116 continuing to extend downward until it communicates with the transition cavity 112. The opening and closing needle 2 is fitted in the insertion passage 114 and performs an axial displacement movement in cooperation with the slider 3, the screw 4 and the knob 5 to enter or exit the throttle passage 115. The sliding block 3 is used for embedding the open-close needle 2, is arranged in the sliding cavity 116 and can freely slide along the up-down direction. The knob 5 is arranged right above the valve cover 12 and is riveted with the screw rod 4 into a whole. When the knob 5 is rotated, the screw rod 4 rotates circumferentially around the central axis thereof, and the relative height position thereof is always kept at a fixed value, and the screw rod 4 drives the sliding block 3 to move axially by virtue of the thread pair. When the adjustment of the flow cross section of the throttling channel 115 is performed, only the opening and closing pin 2 performs axial displacement movement, and the screw 4 for driving the opening and closing pin 2 only performs circumferential rotation movement under the matching action of the sliding block 3, so that the axial relative height position of the screw is always kept unchanged.

In practical application, the air throttle valve adopting the design structure at least has the following beneficial effects:

1) in the process of executing flow regulation, the distance value between the knob 5 and the valve body 1 is always kept unchanged, so that the requirement on the height value of the operating space above the valve body 1 is effectively reduced;

2) in view of the fact that the screw rod 4 only executes circumferential rotation movement in the process of driving the opening and closing needle 2, the phenomenon that the exposed length of the screw rod is increased along with the propelling of the flow adjusting process cannot occur necessarily, observation is facilitated, and the probability that operators are collided or hung is reduced as far as possible.

It is known that various designs can be adopted to achieve the assembly of the screw 4 in the valve body 1, and only a circumferential rotation movement can be performed, without an axial displacement movement, however, an embodiment is proposed herein that is simple in design, easy to implement, and later facilitates the execution of the screw 4 replacement operation, as follows: as shown in fig. 3 and 5, an annular position-limiting flange 41 extends outwardly from the peripheral side wall of the screw rod 4, and correspondingly, a receiving groove 121 for receiving the position-limiting flange 41 extends downwardly from the top wall of the valve cover 12. When the screw rod 4 is inserted into the valve cover 12, the annular limiting flange 41 is just pressed against the bottom wall of the accommodating groove 121, and the limiting pin 6 is inserted into and fixed in the accommodating groove 121 and is transversely arranged right above the annular limiting flange 41.

It should be noted that, on the premise that the axial displacement of the screw rod 4 is strictly limited to the designed value range, in order to reduce the difficulty of assembling the limit pin 6, a certain movement space needs to be reserved between the limit pin and the annular limit flange 41 after the limit pin is assembled. The following is recommended: as shown in FIG. 3, assuming that the distance between the central axis of the spacing pin 6 and the annular spacing flange 41 is d, d < 0.5 mm.

Fig. 6 shows a side view of a second embodiment of the air throttle according to the invention, which differs from the first embodiment described above in that:

1) and a wear-resistant sleeve 7 is additionally arranged in the valve seat 11 and is positioned right below the transition cavity 112. The wear sleeve 7 is directly embedded in the valve seat 11 and is arranged between the transition chamber 112 and the air outlet 113. The throttling channel 115 is directly arranged in the anti-wear sleeve 7, and the inner diameter value of the throttling channel is matched with the outer diameter value of the opening and closing needle 2. The advantages of adopting the above technical scheme are that: in the above-described embodiments, the throttle channel 115 is formed directly on the valve seat 11. In practical application, the opening and closing needle 2 needs to frequently slide along the throttling channel 115, which inevitably results in an increase of an assembly gap between the opening and closing needle 2 and the throttling channel 115, and further causes serious deflection of the opening and closing needle 2, further affects the stability of throttling regulation, and also leads to a rapid increase of leakage. In view of this, preferred embodiments are: the throttling channel 115 directly matched with the opening and closing needle 2 is directly formed on the anti-wear sleeve 7 with better anti-wear performance, thereby effectively reducing the wear rate of the throttling channel 115 and ensuring that the throttling channel 115 keeps good shape regularity in a longer application period.

2) A cylindrical spring 8 is added in the sliding cavity 116. The columnar spring 8 is directly sleeved on the opening and closing needle 2 and always applies an elastic force to the bottom wall of the sliding block 3. The advantages of adopting the above technical scheme are that: known, in the above-mentioned technical scheme, be equipped with the screw thread pair between screw rod 4 and sliding block 3, and do benefit to the screw characteristic of screw thread pair in practical application and realize the drive to sliding 3, it has realized dragging to opening and close needle 2. Then, in actual manufacturing and molding, the screw thread pair formed by fitting inevitably has an assembly gap. And when the opening and closing needle 2 is dragged and moved to the position (namely, the change of the flow area of the throttling channel 115 is realized). In actual industrial production, when the air throttle valve is applied to a high-pressure gas environment, the opening and closing needle 2 inevitably moves along the axial direction under the action of high-pressure impact force, so that the flow area of the throttling channel 115 is always in a changing state, and finally the flow regulation stability of the air throttle valve is reduced. Accordingly, a columnar spring 8 is additionally provided below the slide block 3. The cylindrical spring 8 always applies an elastic force to the bottom wall of the sliding block 3, so that the influence of the assembly clearance of the thread pair on the stability of the air throttle valve is effectively eliminated.

It should be noted that, in addition to the above-mentioned cylindrical spring 8 for performing elastic abutting against the sliding block 3, a plastic sleeve, an air spring, etc. may be selected according to different practical application scenarios and different elastic modulus requirements.

Fig. 7 shows a side view of a third embodiment of the air throttle according to the invention, which differs from the second embodiment described above in that: the air throttle valve is additionally provided with a sealing ring 9 according to different practical application scenes. As shown in fig. 8, a receiving cavity 1161 for receiving the sealing ring 9 extends downward from the bottom wall of the sliding cavity 116. When the opening and closing needle 2 is inserted and matched in place relative to the insertion and matching channel, the sealing ring 9 is arranged in the accommodating cavity 1161 and is sleeved on the opening and closing needle 2. The sealing ring 9 is elastically pressed between the cylindrical spring 8 and the bottom wall of the accommodating cavity 1161, and is elastically deformed in a self-adaptive manner to seal the outer side wall of the opening and closing needle 2. The advantages of adopting the above technical scheme are that: it is known that when the air throttle valve is applied to an ultrahigh pressure gas environment, after the gas enters the transition cavity 112, the gas is easily discharged to the external atmosphere along the assembly gap between the opening and closing needle 2 and the insertion and distribution channel 114 again, so that the flow regulation accuracy and stability of the air throttle valve are inevitably affected. In view of this, the development and application of the third embodiment are led. The sealing ring 8 is self-adaptive elastically deformed under the action of the abutting force of the columnar spring 8 to seal the outer side wall of the opening and closing needle 2, so that the phenomenon that air leaks through an assembly gap between the opening and closing needle 2 and the inserting and matching channel 114 is effectively prevented.

Fig. 9 and 10 show a side view and a cross-sectional view, respectively, of a fourth embodiment of the air throttle valve of the present invention, which differs from the third embodiment in that: the air throttle valve can be additionally provided with a locking nut 10 according to different practical application scenes. The lock nut 10 is disposed between the knob 12 and the bonnet 12, and is screwed to the bonnet 12 by a screw pair. After the air throttle valve is adjusted in place, the locking nut 10 is continuously rotated until the locking nut is completely abutted to the knob 12, and the circumferential rotation freedom degree of the knob 12 is limited, so that the condition that the flow adjusting parameter is changed due to the rotation of the knob 12 under the action of unexpected external force is effectively prevented.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air throttle valve is characterized by comprising a valve body, an opening and closing needle, a sliding block, a screw and a knob; the valve body is of a split structure and comprises a valve seat and a valve cover which are butted into a whole; an air inlet, a transition cavity, an air outlet, an insertion channel, a throttling channel and a sliding cavity are arranged in the valve seat; the transition cavity is formed inside the valve seat; the air inlet is formed by extending the outer side wall of the valve seat inwards until the air inlet is communicated with the transition cavity; the air outlet is formed by upward extension of the bottom wall of the valve seat and is communicated with the transition cavity through the throttling channel; the sliding cavity is positioned right above the transition cavity and is formed by downwards extending the top wall of the valve seat; the inserting and matching channel is formed by continuously extending the bottom wall of the sliding cavity downwards until the inserting and matching channel is communicated with the transition cavity; the opening and closing needle is assembled in the inserting and assembling channel and performs axial displacement movement under the synergistic action of the sliding block, the screw rod and the knob so as to enter or exit the throttling channel; the sliding block is used for embedding the opening and closing needle, is arranged in the sliding cavity and can freely slide along the up-down direction; the knob is arranged right above the valve cover and is riveted with the screw rod into a whole; when the knob is rotated, the screw rod rotates circumferentially around the central axis of the knob, the relative height position of the screw rod is always kept at a fixed value, and the screw rod drives the sliding block to move axially by virtue of the thread pair.

2. The air restriction valve according to claim 1, wherein the restriction passage extends from a top wall of the air outlet opening further upwardly and through to the transition chamber.

3. The air restriction valve of claim 2, further comprising a limit pin; an annular limiting flange extends outwards from the peripheral side wall of the screw rod, and correspondingly, an accommodating groove for sinking the limiting flange extends downwards from the top wall of the valve cover; when the screw rod is inserted and matched in place relative to the valve cover, the annular limiting flange is just propped against the bottom wall of the accommodating groove, and the limiting pin is inserted and fixed in the accommodating groove and transversely arranged right above the annular limiting flange.

4. The air restriction valve according to claim 3, wherein d < 0.5mm, assuming a distance d between the stopper pin central axis and the annular stopper flange.

5. The air restriction valve of claim 2, wherein the valve body further comprises a bolt assembly; and after the valve seat and the valve cover are matched, the valve seat and the valve cover are connected and fixed by the bolt component.

6. The air restriction valve of claim 1, further comprising a wear sleeve; the anti-wear sleeve is embedded in the valve seat and is arranged between the transition cavity and the air outlet; the throttling channel is directly arranged in the anti-wear sleeve.

7. The air restriction valve according to any of claims 1-6, further comprising a resilient member; the elastic piece is arranged in the sliding cavity, and always applies an elastic force to the bottom wall of the sliding block.

8. The air restriction valve according to claim 7, wherein the elastic member is a cylindrical spring.

9. The air restriction valve of claim 7, further comprising a sealing ring; an accommodating cavity for placing the sealing ring is extended downwards from the bottom wall of the sliding cavity; when the opening and closing needle is inserted and matched in place relative to the insertion and matching channel, the sealing ring is arranged in the accommodating cavity and is sleeved on the opening and closing needle; the sealing ring is elastically extruded between the elastic piece and the bottom wall of the containing cavity and is subjected to adaptive elastic deformation to realize sealing of the outer side wall of the opening and closing needle.

10. The air restriction valve of claim 9, further comprising a lock nut; the locking nut is arranged between the knob and the valve cover and screwed on the valve cover by virtue of a thread pair; and after the air throttle valve is adjusted in place, continuously rotating the locking nut until the locking nut is completely contacted with the knob, and limiting the circumferential rotation freedom degree of the knob.