CN217736465U - Needle valve with switch valve position detects function - Google Patents

Abstract

The utility model relates to a needle valve specifically discloses a needle valve with switch valve position detects function, including the valve body with can make reciprocating motion's needle in the valve body. A portion of the valve needle is located outside of the valve body. The needle valve also comprises a sensing piece and a detection unit for detecting the position of the sensing piece. The induction sheet is connected with a valve needle positioned outside the valve body. The detection unit is mounted on the valve body. This application embodiment detects the position of the response end of response piece when the needle is in the open mode or when the closure state through the sense end of detecting element through install the detecting element additional on the needle valve to judge the switching condition of needle valve. The detection unit can feed back the detection result to a remote place, thereby realizing remote monitoring.

Description

Needle valve with switch valve position detects function

Technical Field

The utility model relates to a needle valve, concretely relates to needle valve with switch valve position detects function.

Background

The existing medium conveying system mostly adopts a ball valve to control the on-off. In order to monitor whether the switch of the ball valve is in place, a valve position indicator is usually added on the ball valve in the prior art. However, after the ball valve is used for a long time, the valve core or the valve seat is easy to wear, and the problem of medium leakage is possibly caused, so that the ball valve is not suitable for the field of high-pressure medium conveying.

To improve the sealing properties during the transport of the medium, needle valves may be used in the transport system. However, since the movement operation principle of the needle valve is different from that of the ball valve, the needle valve cannot be provided with a valve position indicator, and the open/close state of the needle valve cannot be intuitively known.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a needle valve with switch valve position detects function aims at solving the difficult problem of knowing of switching state of needle valve.

For solving the above technical problem, the utility model discloses the technical scheme who adopts does:

a needle valve with valve position detecting function comprises a valve body and a needle capable of reciprocating in the valve body. A portion of the valve needle is located outside of the valve body. The needle valve also comprises a sensing piece and a detection unit for detecting the position of the sensing piece. The induction sheet is connected with a valve needle positioned outside the valve body. The detection unit is mounted on the valve body.

Therefore, in the embodiment of the application, the detection unit is additionally arranged on the needle valve, and the position of the sensing end of the sensing sheet when the needle valve is in the opening state or the closing state is detected through the detection end of the detection unit, so that the opening and closing conditions of the needle valve are judged. The detection unit can feed back the detection result to a remote place, thereby realizing remote monitoring.

In some embodiments, the sensing tab has a sensing end. The detection units are arranged in two, and the two detection units are arranged side by side along the movement direction of the valve needle. The detection unit is provided with a detection end. The sensing end reciprocates between the detection ends of the two detection units.

This application embodiment can detect two motion endpoints of response piece respectively through two detecting element, detects the opening or the closed position of the response end of response piece respectively through two detecting element promptly to the accuracy of detection has been improved.

In some embodiments, the moving direction of the sensing terminal is parallel to a connecting line of the detecting terminals of the two detecting units, so as to reduce the installation space of the detecting units. Or the motion direction of the induction end is positioned on a connecting line of the detection ends of the two detection units, so that the space utilization rate and the detection accuracy are further improved. The two structural forms can be selected according to needs, and application diversity of the embodiment of the application is improved.

In some embodiments, the sensing piece has two sensing ends, the two sensing ends are respectively arranged at two sides of the axis of the valve needle, and the two sensing ends are distributed at intervals along the movement direction of the valve needle. The detecting units are two and are respectively arranged corresponding to the two induction ends. The detection units are provided with detection ends, and the detection ends of the two detection units are arranged oppositely.

The motion positions of the two induction ends of the induction sheet are respectively detected through the two detection units, so that the detection accuracy can be further improved. And when one detection unit is in fault, the other detection unit can also detect the opening or closing state of the needle valve, namely the two detection units can also realize one use and one standby.

In some embodiments, the detection unit includes a bracket and a position sensor. The support is arranged on the connecting frame. The position sensor is mounted on the bracket.

In this way, the position sensor can be firmly fixed to the attachment bracket by the bracket, and the mounting position can be adjusted by the bracket.

In some embodiments, the position sensor is connected to the bracket in a position adjustable manner, so that the position of the position sensor can be flexibly adjusted, and the position of the position sensor on the bracket can be accurately adjusted to better meet the use requirement.

In some embodiments, the position sensor is provided with external threads. The bracket is provided with a threaded hole matched with the external thread. Or, a through hole for the position sensor to pass through is formed in the bracket. The position sensors on two sides of the through hole are respectively screwed with a nut.

That is, the position sensor and the bracket can be connected in various forms and can be selected according to the requirement.

In some embodiments, the position sensor is any one of a contact sensor or a proximity sensor, which can be selected as desired. For example, a proximity sensor is a position switch that can be operated without mechanical direct contact with a moving part, and when the sensing surface of an object proximity switch reaches an operating distance, the switch can be operated without mechanical contact and any pressure, and no pressure, no spark, and an electrical command can be quickly issued to accurately reflect the position and the stroke of a moving mechanism.

In some embodiments, the needle valve further comprises a connecting frame and a linear actuator. The straight-moving actuator is connected with the valve body through the connecting frame. The straight-moving actuator is used for driving the valve needle to reciprocate in the valve body. The detection unit is installed on the connecting frame.

This application embodiment can direct mount on pneumatic needle valve, and it is very convenient to use promptly, does not need too big change to needle valve body itself, alright realize that the needle opens or the accurate detection of closed condition.

Drawings

Fig. 1 is a schematic structural view of a needle valve body according to an embodiment of the present invention.

Fig. 2 is a schematic view of an assembly structure of the needle valve body and the detection unit according to the first embodiment of the present invention.

Fig. 3 is a schematic structural view of a possible relative arrangement position relationship between the detecting unit and the sensing sheet according to the first embodiment of the present invention.

Fig. 4 is a schematic structural view of the needle valve body according to the second embodiment of the present invention.

Fig. 5 is a schematic view of an assembly structure of the needle valve body and the detecting unit according to the second embodiment of the present invention.

The definitions of the reference symbols in the figures are: the device comprises a straight-moving actuator 1, a connecting frame 2, a valve needle 3, a sensing piece 4, a valve body 5, a support 6 and a position sensor 7.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention is further described in detail with reference to the specific embodiments.

In the description of the present invention, it should be understood that the directional descriptions, such as the directions or positional relationships indicated by upper, lower, front, rear, left, right, etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but not for indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. The terms first, second and the like, if any, are used for distinguishing technical features only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

In the prior art, a ball valve realizes the function of controlling the on-off of a medium through the matching of a spherical valve core and a valve seat. The valve position indicator is provided with a linkage shaft at the bottom and a switch indicating mark at the top. The valve rod of the ball valve is detachably connected with the linkage shaft, and when the valve rod of the driving ball valve rotates, the valve rod drives the linkage shaft to rotate, so that the switch indicating mark indicates a switch state.

The applicant finds that although the ball valve is widely used, the opening and closing action of the ball valve is realized by rotating, and the ball valve realizes the opening and closing function through the 90-degree rotation of the spherical valve core in the valve body. Because the valve core of the ball valve is in surface contact with the valve seat, the contact area is large, and the abrasion area is also large, after the ball valve is used for a long time, the outer surface of the valve core and the inner surface of the valve seat are seriously abraded, so the ball valve is not suitable for the field of high-pressure medium conveying, and the problem of leakage is easily caused when small molecular gases such as hydrogen, helium and the like are conveyed. Therefore, the ball valve has short service life when being applied to the field of high-pressure medium transportation or small molecule gas transportation, needs to be replaced frequently, and has high cost.

In order to improve the air tightness during the transportation of small molecule gases such as hydrogen and helium, the applicant tried to adopt a needle valve. The opening and closing process of the needle valve is that the valve rod moves up and down relative to the valve seat and comprises linear reciprocating motion and rotary reciprocating motion, the valve rod realizes linear sealing in a mode that the end part of the valve rod is sealed with the conical surface of the valve seat, so that the needle valve has high adjusting precision and sealing performance, and the needle valve can also be applied to the field of high-pressure medium conveying.

However, in the prior art, there is no indicator for detecting the open/close valve position of the needle valve, so that the open/close state of the needle valve cannot be intuitively known.

The application provides a needle valve with a function of detecting the position of the switch valve based on the problem, and aims to solve the problem that the opening and closing state of the needle valve is not easy to know.

Example one

The needle valve with the function of detecting the opening and closing valve positions comprises a needle valve body and a detection unit.

As shown in fig. 1, the needle valve body may include a valve body 5 and a needle 3 reciprocally movable in the valve body 5, and a portion of the needle 3 is located outside the valve body 5 to serve as a mounting base for the sensing piece 4.

As shown in fig. 2, the detecting unit is mounted on the valve body 5, and detects the position of the sensing piece 4 by the detecting unit, so as to determine whether the movement of the needle 3 is in place, and further determine the open/close state of the needle.

For example, with a pneumatic needle valve as illustrated in fig. 1, the pneumatic needle valve includes a straight-traveling actuator 1 and a connecting frame 2 in addition to a valve body 5 and a valve needle 3.

Wherein, the straight-moving actuator 1, the connecting frame 2 and the valve body 5 are connected into a whole in sequence. One end of the valve needle 3 is connected with the straight-moving actuator 1, the other end of the valve needle is inserted into the valve body 5, and the valve needle 3 is driven by the straight-moving actuator 1 to realize the reciprocating motion in the valve body 5, so that the opening and closing of the needle valve are realized. The linear actuator 1 may alternatively be a pneumatic actuator, such as a cylinder. The sensing piece 4 is connected on the valve needle 3 and is positioned in the connecting frame 2, and the motion state of the valve needle 3 is marked through the sensing piece 4, so that the opening and closing state of the valve needle is fed back.

The connection between the sensing piece 4 and the valve needle 3 is a connection mode with adjustable position, for example, an external thread can be processed on the valve needle 3, one end of the sensing piece 4 is provided with a through hole and sleeved on the valve needle 3, and the sensing piece 4 is clamped and locked on the valve needle 3 by two nuts, so that the position of the sensing piece 4 can be adjusted at any time through the nuts.

As shown in fig. 2, the detecting unit is mounted on the connecting frame 2 for detecting the position of the sensing piece 4.

For example, the sensing piece 4 may have one sensing terminal. Correspondingly, the detection unit also has a detection terminal. The position of the sensing end of the sensing piece 4 when the valve needle 3 is in the opening state or the closing state is detected through the sensing end of the detection unit, so that the opening and closing conditions of the valve needle are judged. The detection unit can feed back the detection result to a remote place, thereby realizing remote monitoring.

Since one detecting unit can detect only one of the open and closed states of the needle valve and cannot detect the other state, the feedback performance of the needle valve can be further improved.

In the case where the sensing piece 4 has only one sensing end, two sensing units may be disposed side by side in the moving direction of the needle 3 such that the sensing end of the sensing piece 4 reciprocates between the sensing ends of the two sensing units. Two detecting element are used for detecting the position of the response end of response piece 4 when needle valve open mode and closed state respectively to realize the accurate detection of needle valve open and close state, improve and detect the precision.

The specific mounting position of the sensing units may be that both sensing units are mounted on a side of the connecting frame 2 parallel to the moving direction of the needle 3 as shown in fig. 2, so that the moving direction of the sensing end of the sensing piece 4 is parallel to the connecting line of the sensing ends of the two sensing units. In which case the installation space required for the detection unit is small.

Obviously, two detection units can also be mounted on each side of the direction of movement of the valve needle 3, but they can perform the same detection function.

As shown in fig. 3, two detecting units may be arranged side by side on two sides of the connecting frame 2 corresponding to two ends of the valve needle 3 in the moving direction along the moving direction of the valve needle 3, so that the moving direction of the sensing end of the sensing piece 4 is located on the connecting line of the detecting ends of the two detecting units, and the same detecting function can be realized.

In the embodiment of the present application, as shown in fig. 2, the detection unit may include a bracket 6 and a position sensor 7. The bracket 6 may be detachably mounted to the link frame 2 by means of screws or the like or may be non-detachably mounted by welding or the like. The position sensor 7 is connected to the bracket 6 in a position-adjustable manner, so that the position of the position sensor 7 can be adjusted.

For example, the position sensor 7 may be provided with external threads. The bracket 6 can be provided with a threaded hole matched with the external thread, or the bracket 6 can be provided with a through hole for the position sensor 7 to pass through, and the position sensors 7 on the two sides of the through hole are respectively screwed with a nut.

The position sensor 7 is a sensor that senses the position of the object to be measured and converts the sensed position into a usable output signal, and includes a contact sensor or a proximity sensor. The embodiment of the present application may select any one of a touch sensor and a proximity sensor.

The contact of the touch sensor is pressed by two objects, and a travel switch, a two-dimensional matrix position sensor and the like are common. The travel switch has simple structure, reliable action and low cost, and when some object touches the travel switch in the moving process, the internal contact can act, thereby completing the control. The two-dimensional matrix position sensor can be used for detecting the contact position of the two-dimensional matrix position sensor and a certain object.

Proximity sensors, also called proximity switches, are switches that signal an "action" when an object is in proximity to it for a set distance, without the need for direct contact with the object. There are many types of proximity switches, mainly electromagnetic, photoelectric, differential transformer, eddy current, capacitive, reed switch, hall switch, and the like.

With the above-described function of the position sensor 7, the present embodiment mounts, for example, a proximity switch on the link frame 2. When the valve needle 3 drives the sensing piece 4 to move up and down, the proximity switch can sense the movement of the sensing piece 4 and output a signal, so that the remote monitoring function of the needle valve is realized. The structure shown in fig. 2 is taken as an example to explain the specific working principle:

for example, in the case of a normally closed needle valve, the needle valve opens when the needle 3 moves upward. When the needle valve is in a normally closed state, the proximity switch below detects the sensing end of the sensing sheet 4 and feeds back a detection signal to know that the needle valve is in the closed state. When the valve needle 3 moves upwards, the sensing end of the sensing piece 4 gradually leaves the proximity switch below, and then the sensing end of the sensing piece 4 gradually approaches the proximity switch above. When the sensing end of the sensing piece 4 reaches the detection end of the upper proximity switch, the upper proximity switch generates an electric signal, so that the opening of the needle valve is judged and the state of the needle valve is fed back.

For a normally open needle valve, the needle 3 moves downward as the needle closes. When the needle valve is in a normally open state, the proximity switch above the needle valve detects the sensing end of the sensing sheet 4 and feeds back a detection signal to know that the needle valve is in an open state. When the valve needle 3 moves downwards, the sensing end of the sensing piece 4 gradually leaves the proximity switch above, and then the sensing end of the sensing piece 4 gradually approaches the proximity switch below. When the sensing end of the sensing piece 4 reaches the detection end of the proximity switch below, the proximity switch below generates an electric signal, so that the closing of the needle valve is judged and the state is fed back.

Example two

The difference from the first embodiment lies in that the arrangement manner of the sensing chip 4 and the detection unit in the second embodiment is different, which is specifically as follows:

as shown in fig. 4, in some embodiments, the sensing piece 4 has two sensing ends, the two sensing ends are respectively disposed at two sides of the axis of the valve needle 3, and the two sensing ends are spaced apart along the moving direction of the valve needle 3. For example, the two sensing ends of the sensing piece 4 are respectively located at the left side and the right side of the valve needle 3, and the sensing end at the left side is located above the sensing end at the right side.

Meanwhile, as shown in fig. 5, two detection units are also provided, the two detection units are respectively arranged corresponding to the two sensing ends, and the detection ends of the two detection units are oppositely arranged. For example, a position sensor 7 is mounted on the left side of the link frame 2 via a bracket 6 with its sensing end facing upward. The right side of the connecting frame 2 is provided with another position sensor 7 through another bracket 6, and the detection end of the position sensor faces downwards.

The second embodiment is similar to the first embodiment in operation principle, and the structure shown in fig. 5 is taken as an example to explain the specific operation principle:

for example, in the case of a normally closed needle valve, the needle valve opens when the needle 3 moves upward. When the valve is in a normally closed state, the right sensing end of the sensing piece 4 is detected by the right proximity switch, the left sensing end of the sensing piece 4 is not detected by the left proximity switch, and the feedback needle valve is in a closed state at the moment. When the valve needle 3 moves upwards, the right sensing end of the sensing piece 4 gradually leaves the right proximity switch, and the left sensing end of the sensing piece 4 gradually approaches the left proximity switch. When the left side induction end of the induction sheet 4 reaches the detection end of the left side proximity switch 4, the left side proximity switch generates an electric signal, and at the moment, the right side induction end of the induction sheet 4 is not detected by the right side proximity switch, so that the opening of the needle valve is judged, and the state of the needle valve is fed back.

For a normally open needle valve, the needle 3 moves downward as the needle closes. During normally open state, the left side induction end of response piece 4 is detected by left proximity switch, and the right side induction end of response piece 4 is not detected by the proximity switch on right side, and the feedback needle valve is in the open mode this moment. When the valve needle 3 moves downwards, the left side sensing end of the sensing piece 4 gradually leaves the left proximity switch, and the right side sensing end of the sensing piece 4 gradually approaches the right proximity switch. When the right sensing end of the sensing piece 4 reaches the detection end of the right proximity switch 4, the right proximity switch generates an electric signal, and at the moment, the left sensing end of the sensing piece 4 is not detected by the left proximity switch, so that the closing of the needle valve is judged and the state is fed back.

It should be noted that the present embodiment is not limited to the shape of the sensing piece 4, and for example, the left sensing end may be on top and the right sensing end may be on bottom, or the left sensing end may be on bottom and the right sensing end may be on top. Correspondingly, the arrangement direction of the proximity switch can be changed correspondingly, namely the left side is on the upper side, the right side is on the lower side, or the left side is on the lower side, and the right side is on the upper side. The shape of the entire sensor chip 4 may be substantially zigzag, or may be inverted zigzag.

Although the embodiment of this application has only been described in detail to the pneumatic needle valve that has link 2, it still needs to be said, the basic principle of the utility model is to the needle valve that a part of needle 3 exposes outside valve body 5 all the time, installs response piece 4 on exposed needle 3, directly or indirectly installing support 6 on valve body 5 to dispose position sensor 7 on this support 6 in order to detect the position of response piece 4, thereby realize the detection feedback function of needle 3 opening or closed state position. Therefore, a manual needle valve having a structure that is not listed but is consistent with the above description, such as a manual needle valve with a rotary valve needle, is applicable to the embodiments of the present application.

In the embodiment of the application, the shapes of the induction sheet 4 and the bracket 6 are various, and the induction sheet is convenient to select. The needle valve adopts a detection feedback structure form of a position sensor 7 such as a proximity switch, and the volume of the needle valve is smaller relative to a valve position indicator, and the installation space is saved. The application fills the blank in the technical field of detection of the opening and closing state of the needle valve and realizes the function of remotely monitoring the opening and closing state of the needle valve.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above preferred embodiments should not be considered as limitations of the present invention, and the scope of protection of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be included within the scope of the invention.

Claims (10)

1. A needle valve with a valve position opening and closing detection function is characterized by comprising a valve body and a needle capable of reciprocating in the valve body; a portion of the valve needle is located outside of the valve body;

the needle valve also comprises a sensing piece and a detection unit for detecting the position of the sensing piece; the induction sheet is connected with a valve needle positioned outside the valve body; the detection unit is mounted on the valve body.

2. The needle valve with the function of detecting the valve position according to claim 1, wherein the sensing piece has a sensing end;

the number of the detection units is two, and the two detection units are arranged side by side along the movement direction of the valve needle; the detection unit is provided with a detection end; the sensing end reciprocates between the detection ends of the two detection units.

3. The needle valve with the function of detecting the opening and closing valve position as claimed in claim 2, wherein the moving direction of the sensing end is parallel to a connecting line of the detecting ends of the two detecting units.

4. The needle valve having a function of detecting a valve position according to claim 2, wherein a moving direction of the sensing end is located on a line connecting the detecting ends of the two detecting units.

5. The needle valve with the function of detecting the opening and closing valve position as claimed in claim 1, wherein the sensing sheet has two sensing ends, the two sensing ends are respectively arranged at two sides of the axis of the needle, and the two sensing ends are distributed at intervals along the movement direction of the needle;

the number of the detection units is two, and the two detection units are respectively arranged corresponding to the two induction ends; the detection units are provided with detection ends, and the detection ends of the two detection units are arranged oppositely.

6. A needle valve with an open/close valve position detection function according to any one of claims 1 to 5, wherein the detection unit comprises a holder and a position sensor; the bracket is arranged on the valve body; the position sensor is mounted on the bracket.

7. The needle valve having an open/close valve position detecting function according to claim 6, wherein the position sensor is position-adjustably attached to the holder.

8. The needle valve having a function of detecting a position of an on-off valve as claimed in claim 7, wherein the position sensor is provided with an external thread;

the bracket is provided with a threaded hole matched with the external thread; or,

the bracket is provided with a through hole for the position sensor to pass through; and the position sensors positioned on two sides of the through hole are respectively screwed with a nut.

9. The needle valve having an open/close valve position detecting function according to claim 6, wherein the position sensor is any one of a contact sensor and a proximity sensor.

10. The needle valve with the function of detecting the opening and closing valve position according to any one of claims 1 to 5, wherein the needle valve further comprises a connecting frame and a straight-moving actuator;

the straight-moving actuator is connected with the valve body through the connecting frame; the straight-moving actuator is used for driving the valve needle to reciprocate in the valve body;

the detection unit is mounted on the connecting frame.

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