Limit switch target and valve

Abstract

According to the limit switch target and the valve, a valve rod connector is connected with a valve rod, so that the valve rod connector can synchronously move along with the valve rod, and the moving distance of the valve rod connector is consistent with the moving distance of the valve rod; the valve rod connector is connected with the stroke amplification assembly, the stroke amplification assembly can amplify the moving distance of the valve rod connector, the stroke amplification assembly is connected with the target body, the target body can be in detection fit with the limiting switch, the axis of the target body is consistent with the axis of the valve rod connector, and the target body is in sliding fit with the shell. Under the condition that the overall stroke of the valve is small, the moving distance of the target body can be larger than the moving distance of the valve rod through the stroke amplification assembly, so that the limiting switch can detect the target body to achieve state switching of the limiting switch, the limiting switch can accurately detect the running state of the valve, and the safety of the valve is improved. And the detection accuracy of the limit switch is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical components, more particularly, to a limit switch target and a valve. BACKGROUND

[0002] The target is a magnetic material, which is usually installed at the position of the valve stem of the valve and can move synchronously with the valve switch. The limit switch is installed at a fixed position and can detect the opening and closing state of the valve by detecting the position of the target. In the prior art, when the valve switches from the open state to the closed state, the target moves with the valve. When the target moves to the sensing position, the limit switch can sense the target. At this time, the limit switch switches from the normally closed state to the normally open state, and the running position of the valve is fed back in time. However, when the valve switches from the closed state to the open state, the limit switch cannot switch from the normally open state to the normally closed state when the target moves to the sensing position, and the limit switch still needs to move a certain distance to switch the state, so that the limit switch cannot accurately detect the running state of the valve when the overall stroke of the valve is small, and safety hazards exist in the operation process.

[0003] In summary, how to improve the accuracy of limit switch detection when the overall stroke of the valve is small is a problem that needs to be solved by the technical personnel in the field at present. CONTENT OF THE INVENTION

[0004] Therefore, the purpose of the present application is to provide a limit switch target and a valve, which can improve the accuracy of limit switch detection when the overall stroke of the valve is small.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A limit switch target comprises: a valve stem connector, which is used for connecting a valve stem; a stroke amplification assembly, which is connected to the valve stem connector and is used for amplifying the moving distance of the valve stem connector; a target body, which is connected to the stroke amplification assembly and is used for cooperating with the limit switch detection, and the axis of the target body is consistent with the axis of the valve stem connector; and a shell, wherein the valve stem connector and the stroke amplification assembly are arranged in the shell, and the target body is in sliding cooperation with the shell.

[0007] In some embodiments, the stroke amplification assembly comprises a first connecting rod, a second connecting rod and a third connecting rod; the first end of the first connecting rod is movably connected to the valve stem connector, and the second end of the first connecting rod is rotatably connected to the first end of the second connecting rod; the second end of the second connecting rod is rotatably connected to the first end of the third connecting rod, and the second end of the third connecting rod is movably connected to the target body.

[0008] In some embodiments, the housing is internally fixedly connected with a first fixing member and a second fixing member; the first fixing member is provided with a first rotating shaft, the first connecting rod is rotationally connected with the first rotating shaft; the second fixing member is provided with a second rotating shaft, the third connecting rod is rotationally connected with the second rotating shaft; the first fixing member and the second fixing member are sequentially distributed along the axial direction of the valve rod connector.

[0009] In some embodiments, the distance from the connecting point of the first end of the first connecting rod to the valve rod connector to the first rotating shaft is A, the distance from the first rotating shaft to the connecting point of the second end of the first connecting rod and the first end of the second connecting rod is B, wherein B>A; the distance from the connecting point of the second end of the second connecting rod and the first end of the third connecting rod to the second rotating shaft is C, the distance from the second rotating shaft to the connecting point of the second end of the third connecting rod and the target body is D, wherein D>C.

[0010] In some embodiments, the first end of the first connecting rod is provided with a first connecting groove, the first connecting groove is movably connected with the valve rod connector, and the first connecting groove has a space for rotation and movement relative to the valve rod connector; the second end of the third connecting rod is provided with a second connecting groove, the second connecting groove is movably connected with the target body, and the second connecting groove has a space for rotation and movement relative to the target body.

[0011] In some embodiments, the target body is movably connected with the second connecting groove through a connecting shaft, and the connecting shaft is sleeved with a shaft sleeve.

[0012] In some embodiments, the first connecting groove is an elongated slot.

[0013] In some embodiments, the second connecting groove is an elongated slot.

[0014] In some embodiments, the valve rod connector is connected with a guide bracket, and the guide bracket is slidingly fitted with the housing.

[0015] In some embodiments, the valve rod connector penetrates through the guide bracket, and the valve rod connector is fixedly connected with the guide bracket.

[0016] A valve, characterized by comprising a limit switch and the limit switch target as described above.

[0017] The limit switch target provided by the application is provided with a valve rod connector and a stroke amplification assembly in the shell, the valve rod is connected through the valve rod connector, so that the valve rod connector can move synchronously with the valve rod, and the movement distance of the valve rod connector is consistent with the movement distance of the valve rod; the valve rod connector is connected with the stroke amplification assembly, the stroke amplification assembly can amplify the movement distance of the valve rod connector, the stroke amplification assembly is connected with a target body, the target body can be detected with the limit switch, the axis of the target body is consistent with the axis of the valve rod connector, and the target body is in sliding fit with the shell, so that in the case that the overall stroke of the valve is small, the movement distance of the target body can be greater than the movement distance of the valve rod through the stroke amplification assembly, so that the limit switch can detect the target body to realize the state switching of the limit switch, and the limit switch can accurately detect the running state of the valve, and the accuracy of the limit switch detection is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0019] Figure 1 The structural schematic diagram of the limit switch target provided by the embodiment of the present application is shown in the figure.

[0020] Figure 2 The internal structural schematic diagram of the limit switch target provided by the embodiment of the present application is shown in the figure.

[0021] Figure 3 The internal structural schematic diagram of the limit switch target provided by the embodiment of the present application is shown in the figure. Figure 2 The bottom view of the internal structural schematic diagram is shown in the figure.

[0022] Figure 4 The groove structure schematic diagram in the limit switch target provided by the embodiment of the present application is shown in the figure.

[0023] Figure 5 The stroke schematic diagram of the limit switch target provided by the embodiment of the present application is shown in the figure.

[0024] Figure 6 The schematic diagram of the limit switch target cooperating with the limit switch provided by the embodiment of the present application is shown in the figure.

[0025] Explanation of reference signs:

[0026] 1 - housing, 2 - valve rod connector, 3 - guide bracket, 4 - first connecting rod, 41 - first connecting groove, 5 - second connecting rod, 6 - third connecting rod, 61 - second connecting groove, 7 - first fixing member, 71 - first rotating shaft, 8 - second fixing member, 81 - second rotating shaft, 9 - connecting shaft, 10 - shaft sleeve, 11 - target body, 20 - limit switch. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing the specific embodiments and are not intended to be limiting on the present application. As used in the specification and the appended claims of the present application, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “one or more” as used in the embodiments of the present application refer to one, two, or more than two.

[0029] In the present specification, the phrase “one embodiment” or “some embodiments” etc. means that a particular feature, structure or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Therefore, the phrases “in one embodiment”, “in some embodiments”, “in other some embodiments”, “in further some embodiments” etc. appearing in different places in the present specification are not necessarily all referring to the same embodiment, but mean “one or more but not all embodiments”, unless otherwise specifically emphasized. The terms “include”, “contain”, “have” and their variants mean “including but not limited to”, unless otherwise specifically emphasized.

[0030] The plurality referred to in the embodiments of the present application means greater than or equal to two. It should be noted that in the description of the embodiments of the present application, the terms “first”, “second” etc. are only used for the purpose of distinguishing the description and cannot be understood as indicating or implying relative importance or indicating or implying order.

[0031] As Figure 1As shown, the limit switch target provided in this application embodiment includes a valve stem connector 2, a stroke amplification assembly, a target body 11, and a housing 1. The valve stem connector 2 is used to connect to the valve stem on the valve, so that the valve stem connector 2 can move synchronously with the valve stem when the valve is open or closed, and the moving distance of the valve stem connector 2 is consistent with the moving distance of the valve stem. The stroke amplification component is connected to the valve stem connector 3, and the stroke amplification component can amplify the moving distance of the valve stem connector 2. The target body 11 is connected to the stroke amplification component, and the target body 11 can achieve detection cooperation with the limit switch 20, and the axis of the target body 11 is consistent with the axis of the valve stem connector 2. The valve stem connector 2 and the stroke amplification component are both set in the housing 1, and the target body 11 can slide with the housing 1. In this way, when the overall stroke of the valve is small, the stroke amplification component makes the moving distance of the target body 11 greater than the moving distance of the valve stem, so that the limit switch 20 can detect the target body 11 to realize the state switching of the limit switch 20, so that the limit switch 20 can accurately detect the operating state of the valve and improve the detection accuracy of the limit switch 20.

[0032] In practice, a top cover is provided on the stroke amplification component. The top cover can cooperate with the housing 1 to house the various components inside the housing 1, so as to reduce interference from external foreign objects.

[0033] like Figure 1 As shown, the stroke amplification assembly includes a first link 4, a second link 5, and a third link 6. The first end of the first link 4 is movably connected to the valve stem connector 2, and the second end of the first link 4 is rotatably connected to the first end of the second link 5. The second end of the second link 5 is rotatably connected to the first end of the third link 6, and the second end of the third link 6 is movably connected to the target body 11. This allows the valve stem connector 2 to drive the first link 4, the second link 5, and the third link 6 to move sequentially during horizontal movement. The third link 6 increases the horizontal movement distance of the valve stem connector 2 and transmits this increase to the target body 11, thereby increasing the horizontal movement distance of the target body 11.

[0034] To improve the stability of the valve stem connector 2 during movement, such as Figure 1 As shown, the valve stem connector 2 is connected to the guide bracket 3, and the guide bracket 3 is slidably engaged with the housing 1. The valve stem connector 2 passes through the guide bracket 3 and is fixedly connected to the guide bracket 3, so that the valve stem connector 2 can move synchronously with the guide bracket 3. Under the action of the guide bracket 3, the stability of the valve stem connector 2 moving along its axis can be improved, thereby improving the stability of the target body 11 moving and further improving the detection accuracy of the limit switch 20.

[0035] In some embodiments, the guide bracket 3 can be made of phosphor copper alloy to improve the service life of the guide bracket 3. Of course, the guide bracket 3 can also be made of other metal materials, and the embodiments of the present application do not limit this.

[0036] As shown in Figures 1-2 , the first fixed part 7 is provided with a first rotating shaft 71, and the first connecting rod 4 is rotationally connected with the first rotating shaft 71, so that the first connecting rod 4 can rotate with the first rotating shaft 71 as the center.

[0037] The second fixed part 8 is provided with a second rotating shaft 81, and the third connecting rod 6 is rotationally connected with the second rotating shaft 81, so that the third connecting rod 6 can rotate with the second rotating shaft 81 as the center; and the first fixed part 7 and the second fixed part 8 are sequentially distributed along the axial direction of the valve rod connector 2, so that the first connecting rod 4, the second connecting rod 5 and the third connecting rod 6 can extend horizontally along the axial direction of the valve rod connector 2.

[0038] As shown in Figure 2 , the distance from the connection point of the first end of the first connecting rod 4 to the valve rod connector 2 to the first rotating shaft 71 is A, and the distance from the first rotating shaft 71 to the connection point of the second end of the first connecting rod 4 to the first end of the second connecting rod 5 is B, and B>A;

[0039] Thus, as shown in Figure 5 , when the valve rod connector 2 drives the first connecting rod 4 to move a distance h, at this time the valve rod connector 2 drives the first connecting rod 4 to rotate with the first rotating shaft 71 as the center, so that the horizontal movement distance of the second end of the first connecting rod 4 is approximately (B / A)h, and since B>A, the horizontal movement distance of the second end of the first connecting rod 4 (B / A)h>h.

[0040] It should be noted that since the first connecting rod 4 rotates with the first rotating shaft 71 as the center, the second end of the first connecting rod 4 moves in an arc, but since the horizontal movement distance h of the valve rod connector 2 itself is small, in order to facilitate the embodiment, the horizontal movement distance of the second end of the first connecting rod 4 is approximately (B / A)h.

[0041] As shown in Figure 2 , when the horizontal movement distance of the second end of the first connecting rod 4 is (B / A), the movement of the first connecting rod 4 is transmitted to the third connecting rod 6 through the second connecting rod 5, and the movement distance of the first end of the third connecting rod 6 transmitted by the second connecting rod 5 is approximately (B / A)h.

[0042] As shown in Figure 2As shown, the distance from the connecting point of the second end of the second connecting rod 5 and the first end of the third connecting rod 6 to the second rotating shaft 81 is C, the distance from the second rotating shaft 81 to the connecting point of the second end of the third connecting rod 6 and the target body 11 is D, and D > C;

[0043] In this way, when the second connecting rod 5 drives the first end of the third connecting rod 6 to move a distance of (B / A)h, the third connecting rod 6 rotates with the second rotating shaft 81 as the center, so that the moving distance of the second end of the third connecting rod 6 in the horizontal direction is approximately (B / A)*(D / C)h, and since D > C, the moving distance of the second end of the third connecting rod 6 in the horizontal direction (B / A)*(D / C)h > (B / A)h > h.

[0044] It should be noted that since the horizontal moving distance h of the valve rod connector 2 itself is small, in order to facilitate the embodiment, the moving distance of the second end of the third connecting rod 6 in the horizontal direction is approximately (B / A)*(D / C)h.

[0045] In this way, after passing through the first connecting rod 4, the second connecting rod 5 and the third connecting rod 6, the horizontal moving distance of the target body 11 is (B / A)*(D / C)h, which increases the horizontal moving distance of the target body 11 compared with the moving distance h of the valve rod itself, so that the limit switch 20 can detect the target body 11 to realize the state switching of the limit switch 20, so that the limit switch 20 can accurately detect the running state of the valve, and the accuracy of the limit switch 20 detection is improved.

[0046] In order to enable the first connecting rod 4 and the third connecting rod 6 to transmit the horizontal movement of the valve rod connector 2 and the target body 11, as shown, Figures 2-4 As shown, the first end of the first connecting rod 4 is provided with a first connecting groove 41, the first connecting groove 41 is movably connected with the valve rod connector 2, and the first connecting groove 41 has a space for rotating and moving relative to the valve rod connector 2, so that the horizontal movement of the valve rod connector 2 can drive the first connecting rod 4 to rotate with the first rotating shaft 71 as the center, to realize distance transmission.

[0047] The second end of the third connecting rod 6 is provided with a second connecting groove 61, the second connecting groove 61 is movably connected with the target body 11, and the second connecting groove 61 has a space for rotating and moving relative to the target body 11, so that the rotation of the third connecting rod 6 with the second rotating shaft 81 as the center can drive the target body 11 to move in the horizontal direction, to realize distance transmission.

[0048] In the embodiment of the present application, the first connecting groove 41 and the second connecting groove 61 can both be long strip-shaped grooves, so that the first connecting groove 41 and the second connecting groove 61 both have a space for rotating and moving.

[0049] As shown, Figure 4As shown, the target body 11 is movably connected with the second connecting groove 61 through the connecting shaft 9, and the connecting shaft 9 is sleeved with the shaft sleeve 10, so as to improve the stability of the movement of the target body 11 driven by the third connecting rod 6.

[0050] In actual cases, the connecting shaft and the shaft sleeve can be used to connect between the first connecting rod 4 and the valve rod connector 2, between the first connecting rod 4 and the second connecting rod 5, and between the second connecting rod 5 and the third connecting rod 6, so as to improve the stability of the overall transmission between the valve rod connector 2 and the target body 11, and further improve the accuracy of the detection of the limit switch 20.

[0051] In some embodiments, the shaft sleeve 9 can be made of phosphor copper alloy, and can also be made of other metal materials, which are not limited in the embodiments of the present application.

[0052] In the limit switch target operation provided by the embodiments of the present application, when the valve drives the valve rod to move a distance h, the valve rod connector 2 moves a horizontal distance h, and after passing through the first connecting rod 4, the second connecting rod 5 and the third connecting rod 6, the horizontal movement distance of the target body 11 is enlarged to (B / A)*(D / C)h, compared with the distance h of the valve rod itself, the horizontal movement distance of the target body 11 is increased, so that the limit switch 20 can detect the target body 11 to realize the state switching of the limit switch 20, so that the limit switch 20 can accurately detect the running state of the valve, and the accuracy of the detection of the limit switch 20 is improved.

[0053] The embodiments of the present application also provide a valve comprising the limit switch 20 and the limit switch target described above.

[0054] Since the limit switch target described above has the above-mentioned effects, and the valve described above comprises the limit switch target described above, the valve also has the same technical effects, which will not be described here.

[0055] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A limit switch target, characterized by, The utility model relates to a valve stem connector (2) for connecting a valve stem, a stroke amplification assembly connected to the valve stem connector (2) for amplifying the movement distance of the valve stem connector (2), a target body (11) connected to the stroke amplification assembly for detection cooperation with the limit switch (20), the axis of the target body (11) being consistent with the axis of the valve stem connector (2), a housing (1) in which the valve stem connector (2) and the stroke amplification assembly are arranged, and the target body (11) is in sliding cooperation with the housing (1). The stroke amplification assembly comprises a first connecting rod (4), a second connecting rod (5) and a third connecting rod (6). The first end of the first connecting rod (4) is movably connected to the valve stem connector (2), and the second end of the first connecting rod (4) is rotatably connected to the first end of the second connecting rod (5). The second end of the second connecting rod (5) is rotatably connected to the first end of the third connecting rod (6), and the second end of the third connecting rod (6) is movably connected to the target body (11). The inside of the housing (1) is fixedly connected with a first fixing member (7) and a second fixing member (8).

2. The limit switch target of claim 1, wherein, The first fixing member (7) is provided with a first rotating shaft (71), and the first connecting rod (4) is rotatably connected to the first rotating shaft (71). The second fixing member (8) is provided with a second rotating shaft (81), and the third connecting rod (6) is rotatably connected to the second rotating shaft (81). The first fixing member (7) and the second fixing member (8) are sequentially distributed along the axial direction of the valve stem connector (2).

3. The limit switch target of claim 2, wherein, The distance from the connection point of the first end of the first connecting rod (4) to the valve stem connector (2) to the first rotating shaft (71) is A, and the distance from the first rotating shaft (71) to the connection point of the second end of the first connecting rod (4) and the first end of the second connecting rod (5) is B, wherein B > A. The distance from the connection point of the second end of the second connecting rod (5) to the first end of the third connecting rod (6) to the second rotating shaft (81) is C, and the distance from the second rotating shaft (81) to the connection point of the second end of the third connecting rod (6) and the target body (11) is D, wherein D > C. The first end of the first connecting rod (4) is provided with a first connecting groove (41), the first connecting groove (41) is movably connected to the valve stem connector (2), and the first connecting groove (41) has a space for rotation and movement relative to the valve stem connector (2). The second end of the third connecting rod (6) is provided with a second connecting groove (61), the second connecting groove (61) is movably connected to the target body (11), and the second connecting groove (61) has a space for rotation and movement relative to the target body (11).

4. The limit switch target of claim 3, wherein, The target body (11) is movably connected to the second connecting groove (61) through a connecting shaft (9), and the connecting shaft (9) is sleeved with a shaft sleeve (10). The first connecting groove (41) is an elongated slot.

5. The limit switch target of claim 3, wherein, ​ ​ 6. The limit switch target of claim 5, wherein, ​ 7. The limit switch target of claim 5, wherein, ​ And / or, the second connecting groove (61) is a long strip-shaped groove.

8. The limit switch target of claim 1, wherein, The valve rod connector (2) is connected with a guide bracket (3), and the guide bracket (3) is in sliding fit with the shell (1).

9. The limit switch target of claim 8, wherein, The valve rod connector (2) penetrates through the guide bracket (3), and the valve rod connector (2) is fixedly connected with the guide bracket (3).

10. A valve, characterized by Comprising: A limit switch (20) and a limit switch target as claimed in any of claims 1-9.

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