CN117231762A - Air inlet valve - Google Patents

Abstract

A rotary air inlet valve comprises an air inlet component (1), a valve body (4), a sealing piece (5) and a valve seat (6) matched with the valve body (4). One end of the valve body (4) is connected to the air inlet component (1), the other end of the valve body is matched with the valve seat (6), the sealing element (5) is arranged between the valve body (4) and the valve seat (6), the air inlet component (1) is in fluid communication with the valve body (4), an air passage through hole (52) is formed in the sealing element (5), and an air passage through hole (61) is formed in the valve seat (6); the valve body (4) is movable between a first position and a second position, wherein in the first position, the air passage channel of the valve body (4) is in fluid communication with the air passage through hole (52) of the sealing element (5) and the air passage through hole (61) of the valve seat (6); in the second position, the gas passage of the valve body (4) is offset from the gas passage opening (52) of the seal (5) so as to prevent gas from the valve body (4) from entering the valve seat (6). The air inlet valve is simple in structure and safe to operate.

Description

Air inlet valve

Technical Field

The present disclosure relates to intake valves, and more particularly, to rotary intake valves.

Background

Typically, pneumatic tools such as sharpening machines and ratchet wrenches are equipped with an air inlet valve for controlling the opening and closing of the air supply.

Among the existing air intake valves used in the art, there are two types of air intake valves, one of which is a platen type air intake valve, and as shown in fig. 4, the valve of the air intake valve is operated by an up-and-down movable long trigger 401 to open or close the valve, thereby controlling the opening and closing of the air supply. However, such conventional platen air inlet valves are inconvenient to use because the platen needs to be pressed down by hand at all times while the air supply is kept open. To solve this problem, a rotary intake valve has been developed by those skilled in the art.

There are two types of rotary intake valves, which are described below. A schematic diagram of a first conventional rotary intake valve is shown in fig. 5A and 5B, in which fig. 5A shows a state in which the air valve is opened, and fig. 5B shows a state in which the air valve is closed, and the air passage between the two is opened or closed by rotating the outer air passage 501 relative to the middle air passage 502, so that the control of the cylindrical surface 503 is used to control the opening and closing of the air source. Existing pen grinders typically employ such rotary intake valves. In the intake valve of this configuration, sealing of the air passage is achieved by an O-ring shown in black in the drawing. The O-ring 505 acting on the gas path branch 504 of the O-ring adheres to the cylindrical surface 503, and the bonding surface is uneven, so that gas leakage is liable to occur. Particularly when the inlet valve is used in a high power pneumatic tool, a larger gas passage opening is required in the cylindrical surface 503 to deliver more gas, and thus leakage is more likely to occur. In addition, the rotary air inlet valve needs to use a press fit process in the manufacturing process, and the manufacturing process is relatively complex. A second conventional rotary intake valve is schematically shown in fig. 6A and 6B, where fig. 6A shows a state where the valve is closed and fig. 6B shows a state where the valve is opened. The valve body of the rotary air inlet valve is sealed by rubber overmoulding, and the valve body 601 is provided with two axial holes 602 serving as air paths. Although such a rotary intake valve is not prone to air leakage, a separate spring element (not shown) needs to be attached to the outside of the valve body 601 as a pressure member to push the valve body to seal the valve body.

Therefore, in order to solve the above-mentioned problems, there is a need for a safe, simple-structure rotary intake valve that does not leak air and does not require additional pressure members.

Disclosure of Invention

The present application provides a rotary intake valve for opening and closing an air supply to a pneumatic tool. When the operator rotates the dial to the "open" position, i.e., the first position, the air source is turned on and the pneumatic tool begins to operate. When the operator rotates the dial to the "off" position, i.e., the second position, the air supply is turned off and the pneumatic tool stops working. The air inlet valve provided by the application has the advantages of simple structure and safe operation.

According to one aspect of the present application there is provided a rotary intake valve comprising an intake port component, a valve body, a seal, a valve seat cooperating with the valve body, wherein one end of the valve body is connected to the intake port component and the other end cooperates with the valve seat, the seal being disposed between the valve body and the valve seat. The air inlet component is in fluid communication with the valve body, an air passage through hole is formed in the sealing element, and an air passage through hole is formed in the valve seat; the valve body is movable between a first position in which the gas passage of the valve body is in fluid communication with the gas passage opening of the seal and the gas passage opening of the valve seat; in the second position, the gas passage of the valve body is offset from the gas passage opening of the seal, thereby preventing gas from entering the valve seat from the valve body.

According to another aspect of the application, the air intake valve further comprises a dial having a connector between the dial and the valve body, the connector driving the valve body to rotate together when the dial is rotated.

According to another aspect of the application, the seal is fixedly connected to the valve seat by a dowel pin, and the gas passage opening of the seal is aligned with the gas passage opening of the valve seat.

According to another aspect of the application, the gas path channel of the valve body comprises a first gas path channel arranged along the rotation axis of the valve body and a second gas path channel radially offset from the first gas path channel, and the first gas path channel and the second gas path channel are in gas communication through a channel through hole at the joint of the first gas path channel and the second gas path channel; wherein the first air passage communicates with the air passage of the air inlet component and the second air passage communicates with the air passage through hole of the sealing member when in the first position.

According to another aspect of the application, in the first position, the second air passage of the valve body is aligned with the air passage opening of the seal to communicate with each other; in the second position, the second air passage of the valve body is staggered from the air passage of the sealing member so as not to be communicated.

According to another aspect of the application, a first O-ring is provided on the outer circumference of the valve body adjacent the inlet section for preventing air leakage from between the valve body and the inlet section 1.

According to another aspect of the application, a second O-ring is provided around the second gas passage on a side surface of the valve body facing the seal.

According to another aspect of the application, the second O-ring has an inner diameter smaller than the inner diameter of the first O-ring in the front.

According to another aspect of the application, the connection is a drive pin.

According to another aspect of the application, a crescent is provided on the outer circumference of the valve seat, and the drive pin is capable of sliding in the crescent, the drive pin corresponding to the first and second positions when sliding to the positions of both ends of the groove, respectively.

According to another aspect of the present application, a radial groove is formed on an inner circumference of one end of the dial adjacent to and contacting the valve seat, a groove is formed on an outer circumference of one end of the valve body adjacent to and contacting the valve seat, one end of the driving pin is accommodated in the radial groove, and the other end is accommodated in the groove.

According to another aspect of the application, the rotary intake valve further comprises a tactile member comprising a radial blind hole provided in the valve body, in which a spring and a ball member are provided, the ball member being forced by the spring into one of the two holes in the valve seat when the driving pin slides to both ends of the crescent.

According to another aspect of the application, two lip-shaped protrusions are provided integrally with the sealing member on the surface thereof opposite to the valve body 4, one of the two lip-shaped protrusions surrounding the second gas passage when the valve body is rotated to the first position and the second position.

According to the rotary air inlet valve, the problems existing in the prior art are solved, the air path can be sealed, and the structure of the rotary air inlet valve can be simplified. The rotary air inlet valve has good performance, simple structure and low cost.

Drawings

Fig. 1 is an axial cross-sectional view of a rotary intake valve according to an embodiment of the application.

Fig. 2 is a sectional view taken along line D-D in fig. 1.

Fig. 3A is an exploded schematic view of a rotary intake valve according to an embodiment of the application.

FIG. 3B is a schematic diagram of a valve seat according to an embodiment of the present application.

Fig. 3C is a schematic view of a seal according to another embodiment of the application.

Fig. 4 is a prior art platen intake valve.

Fig. 5A and 5B show a rotary intake valve of the prior art.

Fig. 6A and 6B illustrate another rotary intake valve of the prior art.

The reference numerals in the drawings respectively indicate: 1-an air scoop section; 2-a dial; 21-radial grooves; 3-a first O-ring; 4-a valve body; 41-right side surface of the valve body 4; 42-left side surface of the valve body 4; 43-gas passage of valve body 4; 431-first gas path channel; 432-a second gas path channel; 433-passage through-hole; 44-radial blind holes; 45-grooves; 5-a seal; 51-left side surface of seal 5; 52-gas passage through hole of the seal 5; 53-opening; 54-lip-shaped protrusions; 6-valve seat; 61-gas passage through hole of valve seat 6; 62-well; 63-crescent groove; 7-a drive pin; 8-a spring; 9-ball-shaped member; 10-positioning pins; 11-connection features; 111-pneumatic tool.

Detailed Description

The technical solution of the present application will be further described by way of specific embodiments with reference to the accompanying drawings, however, it will be understood by those skilled in the art that the present application is not limited to these specific embodiments.

It should be noted that the "axial direction" in the present application refers to a direction along the axial direction of the intake valve, i.e., a left-right direction of the paper surface in fig. 1 of the specification. The term "radial direction" in the present application refers to a direction perpendicular to the axial direction. Further, in the present application, it is mentioned that the "up/down/left/right" directions correspond to the up/down/left/right directions of the paper surface in fig. 1, respectively. The above description of directions is not limiting and is merely for convenience of description.

The rotary air inlet valve has one air passage in the valve body, and when the air inlet valve is opened, the air passage is communicated with the pneumatic motor of the pneumatic tool to start the pneumatic motor. Conversely, when the air inlet valve is closed and the air path is blocked, the pneumatic motor stops working.

The rotary intake valve according to the present application is described in detail below with reference to fig. 1 to 3C. The intake port part 1 located on the far right side of the intake valve communicates with an intake pipe (not shown). Compressed air from the air compressor is delivered through the air intake conduit, through the air scoop section 1 into the rotary intake valve, through the air path passageway, and finally into the leftmost pneumatic tool 111 of fig. 1. There may typically be a connector connecting the inlet pipe to the inlet section 1, such as by providing a connection feature 11 in the inlet section 1, with one end of the inlet pipe being connected to the air compressor and the other end being connected to the connection feature 11 of the inlet section 1 by the connector. When the air inlet valve is opened, the air paths are communicated, and compressed air can enter the pneumatic motor of the pneumatic tool 111, so that the pneumatic tool 111 is driven to work. The connection feature 11 is preferably a pipe thread, although other suitable features may be selected by those skilled in the art.

According to some embodiments of the present application, the rotary intake valve mainly includes an intake port part 1, a dial 2, a valve body 4, and a valve seat 6, the valve body 4 is located near one side of the intake port part 1, the valve seat 6 is located on the other side, a portion of the valve body 4 near the valve seat 6 is located inside the valve seat 6, and an outer circumference of the valve body 4 contacts an inner circumference of the valve seat 6 where the two are in contact. The dial 2 is fitted on the left side of the outer circumference of the air inlet section 1, i.e., the side opposite to the air inlet, and is located radially outside the valve body 4. Grooves are respectively arranged at the positions corresponding to the driving plate 2 and the valve body 4, in particular, radial grooves 21 are formed on the inner circumference of one end, close to the valve seat 6, of the driving plate 2, grooves 45 are formed on the outer circumference of one end, close to the valve seat 6, of the valve body 4, radially inserted transmission pins 7 are arranged in the radial grooves 21 and the grooves 45, one ends of the transmission pins 7 are contained in the radial grooves 21, the other ends of the transmission pins 7 are contained in the grooves 45, the driving pins 7 are connected with the driving plate 2 and the valve body 4, and when the driving plate 2 is rotated, the valve body 4 rotates together with the driving plate 2 under the driving of the transmission pins 7. The valve body 4 is internally provided with a gas channel 43 of the valve body 4, the gas channel 43 of the valve body 4 comprises a first gas channel 431 positioned on the rotation axis of the valve body and a second gas channel 432 radially offset from the rotation axis, and the first gas channel 431 and the second gas channel 432 are in gas communication through a channel through hole 433 at the joint of the first gas channel 431 and the second gas channel 432. Specifically, as shown in fig. 1, the first air passage 431 is tangent to the respective cylindrical outer contours of the second air passage 432, thereby forming a passage through hole 433 at the junction. Furthermore, it is also possible to provide that the first air passage 431 is not directly connected to the second air passage 432, but that the air communication is achieved by providing a passage therebetween. The first air passage 431 communicates with the air passage of the air inlet section 1, and the second air passage 432 communicates with the air passage through-hole 52 of the seal 5. When the valve body 4 is rotated, since the first air passage 431 is provided in the direction of the rotation axis of the valve body 4, the position thereof is unchanged, and still aligned with the air passage of the air inlet part 1. While the second gas passage 432 is radially offset so that when the valve body 4 is rotated, the position of the second gas passage 432 is rotated about the axis of rotation and is no longer aligned with the gas passage through hole 52 of the seal 5.

Between the valve body 4 and the valve seat 6a seal 5 is provided, the seal 5 being made of an elastic material, such as rubber, although other elastic materials known to a person skilled in the art may be used. The seal 5 serves to prevent air leakage from the junction between the valve body 4 and the valve seat 6. The sealing member 5 is provided with a gas passage through hole 52 of the sealing member 5 at a position corresponding to the second gas passage 432, the gas passage through hole 52 being capable of being in fluid communication with the second gas passage when the valve body 4 is rotated to a certain position.

The valve seat 6 is positioned at the leftmost side of the rotary air inlet valve, and is internally provided with an air passage through hole 61. The positioning pin 10 is accommodated in a space formed by an opening 53 on the periphery of the seal member 5 and an opening at a position where the valve seat 6 corresponds to the opening 53, and positions the seal member 5 and the valve seat 6, thereby ensuring that the gas passage through hole 52 of the seal member 5 on the seal member 5 is aligned with the gas passage through hole 61 on the valve seat 6 to achieve fluid communication. The pneumatic connection between the valve seat 6 and the pneumatic tool 111 may be suitably configured according to the specific configuration of the connected pneumatic tool 111.

As shown in fig. 3B, the end of the valve seat 6 facing the valve body 4 is nested between the dial 2 and the valve body 4, a crescent 63, for example, a groove of about 1/3 circumference is provided on the outer circumference of the valve seat 6, the driving pin 7 can slide in the crescent 63, when the user operates the dial 2 to drive the driving pin 7 to rotate to one end of the groove, the second air passage 432 of the air passage 43 of the valve body 4 is aligned with the air passage hole 52 on the sealing member 5, and thus is also aligned with the air passage hole 61 on the valve seat 6, at this time, the rotary air inlet valve is in an open state, and compressed air can smoothly reach the air motor of the air tool 111 from the air compressor through the air inlet valve, so that the air tool starts to operate. In contrast, when the user operates the dial 2, for example, rotates in the opposite direction, the driving pin 7 is driven to rotate to the other end of the groove on the valve seat 6, and the second air passage 432 of the air passage 43 of the valve body 4 is staggered from the air passage through hole 52 on the sealing member 5, so that the internal air passage of the air intake valve is cut off, at this time, the rotary air intake valve is in a closed state, and compressed air cannot reach the air motor of the air tool from the air compressor through each air passage in the air intake valve, so that the air tool stops working.

Fig. 2 shows a cross-sectional view along line D-D of fig. 1. Wherein the valve body 4 is provided with a radial blind hole 44, the spring 8 and the ball member 9 are positioned in the radial blind hole 44 on the valve body 4, when the driving pin 7 slides to two end points of the crescent 63 on the valve seat 6, the two holes 62 on the valve seat 6 are respectively aligned with the radial blind hole 44 on the valve body 4, at the moment, under the action of the elastic force of the spring 8, the ball member 9 enters into one of the two upper holes 62 from the radial blind hole 44, so that the user can be provided with the feeling that the valve body 4 respectively reaches an open position (also called a first position) and a closed position (also called a second position). The ball 9 is preferably a steel ball, although other suitable means may be chosen by those skilled in the art.

On the outer circumference of the valve body 4, which is connected to the inlet part 1, a first O-ring 3 is provided, the first O-ring 3 being made of an elastic material, such as rubber, although other elastic materials known to those skilled in the art may be used. The first O-ring 3 is for preventing air from leaking between the valve body 4 and the inlet housing 1, and the first O-ring 3 may be provided on the outer circumference of the valve body 4 near the inlet housing 1 as shown in fig. 1. Due to the sealing action of the first O-ring 3, air cannot leak from between the valve body 4 and the air inlet part 1, so that compressed air entering from the air inlet part 1 will push the right side surface 41 of the valve body 4 against the seal 5 and prevent air from leaking from the junction between the valve body 4 and the seal 5, i.e. the left side surface 42 of the valve body 4 or the left side surface 51 of the seal 5, so that air can only pass through the air passage 43 of the valve body 4, the air passage through hole 52 of the seal 5 and the air passage through hole 61 of the valve seat 6 and then enter the air motor of the air tool. When the valve body 4 rotates to the closed position, the air passage 43 of the valve body 4 also rotates, the outlet of the air passage 43 of the valve body 4 is blocked by the sealing member 5, and the air passage is blocked, and at this time, air cannot enter the air motor.

It should be further explained that the valve body 4 is biased to the left against the sealing member 5, because after compressed air has entered the inlet part 1, the compressed air acts on the right side surface 41 of the valve body, due to a slight gap, for example 2mm, between the left side of the inlet part 1 and the valve body 4. Meanwhile, since the crescent 63, the groove 45, in which the driving pin 7 slides, and the gap between the dial 2 and the air inlet part 1 are not airtight, the gap between the crescent 63, the groove 45, and the dial 2 provides communication between the outside atmosphere and the outer circumferential surface of the valve body 4, and thus the pressure on the outer circumferential surface of the valve body 4 is low, approaching the atmospheric pressure. This means that the pressure on the right side surface 41 of the valve body 4 will be higher than the pressure on the left side surface 42 of the valve body 4, so that the valve body 4 can be kept biased to the left.

In addition, a second O-ring may be provided on the left side surface 42 of the valve body 4 facing the seal 5, in correspondence with the left outer circumference of the second gas passage 432, the second O-ring being the same material as the first O-ring. And the second O-ring has an inner diameter smaller than the inner diameter of the first O-ring 3 described above, and the second O-ring forms a contact area smaller than the first O-ring 3 because the pressure of the contact surface is proportional to the contact area, so that the pressure generated on the right side of the valve body 4 is greater than that on the left side. In this way, even if a small gap is formed between the left side surface 42 of the valve body 4 and the right side surface of the seal 54 due to the left side surface 42 of the valve body 4 or the right side surface of the seal 5 being uneven, the valve body 4 can be kept biased leftward as long as the second O-ring remains sealed.

Further, as shown in fig. 3C, the second O-ring may be replaced with a lip-shaped projection 54 on the seal 5. The lip-shaped protrusion 54 is arranged in the same position and shape as the second O-ring. The lip-shaped protrusion 54 is made of the same material as the seal 5 and is integrally formed with the seal 5. And, when the valve body 4 is rotated to the second position, another lip-shaped protrusion 54 is provided on the surface of the seal 5 opposite to the valve body 4 at a position corresponding to the second air passage 432.

The specific embodiments described herein are offered by way of illustration only, and are not intended to limit the scope of the application. Various modifications, additions and substitutions can be made to the described embodiments by those skilled in the art without departing from the spirit of the application, and all such modifications, additions and substitutions are possible, without departing from the scope of the application as defined in the accompanying claims.

Claims (13)

1. The utility model provides a rotary air inlet valve, includes air inlet part (1), valve body (4), sealing member (5), with valve body (4) complex disk seat (6), wherein valve body (4) one end is connected on air inlet part (1), and the other end cooperates with disk seat (6), sealing member (5) set up between valve body (4) and disk seat (6), its characterized in that:

the air inlet component (1) is in fluid communication with the valve body (4), an air passage through hole (52) is formed in the sealing piece (5), and an air passage through hole (61) is formed in the valve seat (6);

the valve body (4) can move between a first position and a second position, wherein in the first position, the air passage channel of the valve body (4) is in fluid communication with the air passage through hole (52) of the sealing piece (5) and the air passage through hole (61) of the valve seat (6);

in the second position, the gas passage of the valve body (4) is offset from the gas passage opening (52) of the seal (5) so as to prevent gas from the valve body (4) from entering the valve seat (6).

2. Rotary intake valve according to claim 1, characterized in that it further comprises a dial (2), said dial (2) and the valve body (4) having a connection therebetween, said connection, when the dial (2) is rotated, bringing the valve body (4) into rotation.

3. Rotary intake valve according to claim 1, characterized in that the seal (5) is fixedly connected to the valve seat (6) by means of a locating pin (10), the air passage opening (52) of the seal (5) being aligned with the air passage opening (61) of the valve seat (6).

4. A rotary intake valve according to any one of claims 1-3, characterized in that the gas passage (43) of the valve body (4) comprises a first gas passage (431) arranged along the rotational axis of the valve body (4) and a second gas passage (432) radially offset from the first gas passage (431), the first gas passage (431) and the second gas passage (432) being in gas communication via a passage through hole (433) at the junction of the two; wherein the first air passage (431) communicates with the air passage of the air inlet component (1) and the second air passage (432) communicates with the air passage through hole (52) of the sealing member (5) in the first position.

5. Rotary intake valve according to claim 4, in which in the first position the second air passage (432) of the valve body (4) is aligned with the air passage opening (52) of the seal (5) in communication with each other;

in the second position, the second air passage (432) of the valve body (4) is staggered from the air passage (52) of the sealing member (5) so as not to be communicated.

6. A rotary intake valve according to claim 1, provided with a first O-ring (3) on the outer circumference of the valve body (4) adjacent to the inlet part (1) for preventing air leakage from between the valve body (4) and the inlet part 1.

7. Rotary intake valve according to claim 6, wherein a second O-ring is arranged around the second air passage (432) on a side surface of the valve body (4) facing the seal (5).

8. Rotary intake valve according to claim 7, the second O-ring having an inner diameter smaller than the inner diameter of the first O-ring (3) described above.

9. Rotary intake valve according to claim 2, the connection being a drive pin (7).

10. Rotary intake valve according to claim 9, provided with a crescent (63) on the outer circumference of the valve seat (6), the driving pin (7) being slidable in the crescent (63), the driving pin (7) being slidable to the groove's two end positions corresponding to the first and second positions, respectively.

11. Rotary intake valve according to claim 9, wherein a radial groove (21) is provided on an inner circumference of an end of the dial (2) which is close to and contacts the valve seat (6), a groove (45) is provided on an outer circumference of an end of the valve body (4) which is close to and contacts the valve seat (6), one end of the drive pin (7) is accommodated in the radial groove (21), and the other end is accommodated in the groove (45).

12. Rotary intake valve according to claim 10, further comprising a tactile member comprising a radial blind hole (44) provided in the valve body (4), wherein a spring (8) and a ball (9) are provided, the ball (9) entering one of the two holes (62) in the valve seat (6) under the action of the spring (8) when the driving pin (7) slides to both ends of said crescent (63).

13. A rotary intake valve according to claim 6, wherein two lip-shaped protrusions (54) are provided on the surface of the sealing member (5) opposite the valve body 4, which are integrally formed with the sealing member (5), one of the two lip-shaped protrusions (54) surrounding the second air passage (432) when the valve body (4) is rotated to the first position and the second position.