Dual-sealing device for valve opening indicating rod and control valve

Abstract

The utility model relates to the technical field of valve sealing, and particularly discloses a double-sealing device for a valve opening indicating rod and a control valve. Comprising an end cover, a sealing ring and an adjusting sealing ring, wherein the end cover is mounted on a valve cover and sleeves the outer side of an opening indicating rod; the sealing ring sleeves the outer side of the opening indicating rod and is positioned in the end cover; the adjusting sealing ring sleeves the outer side of the opening indicating rod and is positioned in an annular mounting groove formed by the end cover and the opening indicating rod; and the adjusting nut sleeves the outer side of the end cover and extends into the annular mounting groove to extrude the adjusting sealing ring. Compared with the prior art, the double-sealing structure is effectively arranged on the opening indicating rod, so that the sealing performance is greatly improved, the water seepage phenomenon is avoided, the stability of equipment is effectively enhanced, and the service life of the equipment is prolonged; the adjusting sealing ring arranged in the large hole is extruded and adjusted through the adjusting nut, sealing can be achieved, water seepage can be avoided, and the situation that the adjusting sealing ring is excessively extruded, and consequently the adjusting sealing ring is damaged can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valve sealing, and more specifically to a double sealing device for a valve opening indicating rod and a control valve. Background Art

[0002] In the prior art, the opening indicator rod of the pump control valve used only adopts a sealing structure provided between the outer side of the opening indicator rod and the end cover;

[0003] During use, water leakage often occurs at the opening indicator rod because only one layer of sealing structure is set, which poses a hidden danger to the safe and stable operation of the equipment and greatly reduces the service life of the equipment. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a double sealing device for a valve opening indicator rod and a control valve;

[0005] The solution adopted by the utility model to solve the technical problem is:

[0006] on the one hand:

[0007] A double sealing device for a valve opening indicator rod comprises an end cover mounted on a valve cover and sleeved on the outside of the opening indicator rod, a sealing ring sleeved on the outside of the opening indicator rod and located in the end cover, an adjusting sealing ring sleeved on the outside of the opening indicator rod and located in an annular mounting groove formed by the end cover and the opening indicator rod, and an adjusting nut sleeved on the outside of the end cover and extending into the annular mounting groove to squeeze the adjusting sealing ring.

[0008] The utility model effectively realizes the sealing of the opening indicator rod by setting a sealing ring and adjusting the sealing ring to avoid water leakage; the tightness of the sealing ring is controlled and adjusted by squeezing the adjusting nut on the adjusting sealing ring, thereby increasing the service life of the entire sealing structure while ensuring no water leakage;

[0009] In some possible implementations,

[0010] The end cover comprises a body threaded with the valve cover and sleeved on the outside of the opening indicator rod, a support connected with the body and located outside the valve cover, and a connecting part arranged on a side of the support away from the body and connected to the adjusting nut.

[0011] In some possible implementations,

[0012] The connecting portion is provided with a through hole for the opening indicating rod to pass through, and a large hole is provided on the side of the through hole away from the body, which is coaxial with the through hole and forms an annular mounting groove with the outer side of the opening indicating rod.

[0013] In some possible implementations,

[0014] The main body is provided with a through hole for the opening indicating rod to pass through, and the main body is also provided with an annular groove which is communicated with the through hole and is used to install a sealing ring; the through hole, the through hole and the annular groove are coaxially arranged.

[0015] In some possible implementations,

[0016] The adjusting nut includes a sleeve portion which is sleeved on the outside of the connecting portion and connected to the connecting portion, a closing cover which is connected to the side of the sleeve portion away from the end cover and for the opening indicating rod to pass through, and an abutment tube which is coaxially connected to the closing cover and has one end away from the closing cover extending into the annular mounting groove; the abutment tube is sleeved on the outside of the opening indicating rod.

[0017] In some possible implementations,

[0018] The connecting portion is cylindrical, and an external thread is arranged on the outer side of the connecting portion, which is screwed to the sleeve portion; a hole is arranged coaxially with the through hole and has the same diameter as the through hole.

[0019] In some possible implementations,

[0020] The abutting cylinder is provided with a channel which is coaxial with and communicates with the hole and the through hole; the inner diameter of the channel is consistent with the inner diameter of the through hole.

[0021] In some possible implementations,

[0022] The sealing ring comprises two groups of rubber sealing rings with the same structure which are sleeved on the outside of the opening indicating rod; and the adjusting sealing ring is a rubber sealing ring.

[0023] on the other hand:

[0024] A control valve comprises a valve body, a valve cover mounted on the valve body, a central shaft mounted in the valve body, an opening indicator rod with one end connected to the central shaft and the other end passing through the valve cover, and the double sealing device as described above.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] Compared with the prior art, the utility model effectively realizes the setting of a double sealing structure on the opening indicator rod, thereby greatly improving the sealing performance and avoiding water seepage, thereby effectively enhancing the stability of the equipment and prolonging the service life of the equipment;

[0027] The utility model uses an adjusting nut to squeeze and adjust the adjusting sealing ring arranged in the large hole, which can achieve sealing and prevent water seepage on the one hand, and can also prevent excessive squeezing of the adjusting sealing ring and damage thereof on the other hand;

[0028] The utility model has the advantages of simple structure and strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the control valve in the utility model;

[0030] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0031] Figure 3 It is a structural schematic diagram of the end cover in the utility model;

[0032] Figure 4 It is a structural schematic diagram of the adjusting nut in the utility model;

[0033] Among them: 1. end cover; 11. body; 12. support; 121. annular groove; 13. connecting part; 131. large hole; 2. adjusting nut; 21. sleeve part; 22. closing cover; 23. abutting cylinder; 3. sealing ring; 4. adjusting sealing ring; 10. valve cover; 20. valve body; 30. center axis; 40. opening indicator rod. DETAILED DESCRIPTION

[0034] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. The "first", "second" and similar words mentioned in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "one" and other similar words do not indicate a quantity limit, but indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can indicate: A exists alone, A and B exist at the same time, and B exists alone. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more. For example, multiple positioning columns refer to two or more positioning columns. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0035] The utility model is described in detail below.

[0036] like Figure 1-Figure 4 As shown:

[0037] A double sealing device for a valve opening indicator rod 40 comprises an end cover 1 mounted on a valve cover 10 and sleeved on the outside of the opening indicator rod 40, a sealing ring 3 sleeved on the outside of the opening indicator rod 40 and located in the end cover 1, an adjusting sealing ring 4 sleeved on the outside of the opening indicator rod 40 and located in an annular mounting groove formed by the end cover 1 and the opening indicator rod 40, and an adjusting nut 2 sleeved on the outside of the end cover 1 and extending into the annular mounting groove to squeeze the adjusting sealing ring 4; the adjusting sealing ring 4 is arranged on the side of the sealing ring 3 away from the valve cover 10.

[0038] The utility model effectively realizes the sealing of the opening indicator rod 40 by providing the sealing ring 3 and the adjusting sealing ring 4, thereby avoiding water leakage; the tightness of the sealing ring 4 is controlled and adjusted by squeezing the adjusting nut 2 on the adjusting sealing ring 4, thereby increasing the service life of the entire sealing structure while ensuring no water leakage;

[0039] In some possible implementations, in order to effectively realize the coordinated installation of the end cover 1, the adjusting seal ring 4, the adjusting nut 2, and the valve cover 10;

[0040] The end cover 1 comprises a body 11 which is threadedly connected to the valve cover 10 and sleeved on the outside of the opening indicator rod 40, a support 12 which is connected to the body 11 and located on the outside of the valve cover 10, and a connecting portion 13 which is arranged on the side of the support 12 away from the body 11 and connected to the adjusting nut 2;

[0041] The valve cover 10 is provided with an internal threaded hole which is threadedly connected with the body 11. The body 11 is cylindrical and has an external thread on the outside, so as to effectively realize the connection between the end cover 1 and the valve cover 10.

[0042] One end of the opening indicator rod 40 passes through the connecting portion 13, the support 12, and the body 11 and is connected to the central axis 30 in the valve body 20;

[0043] In some possible implementations,

[0044] The connecting portion 13 is provided with a through hole for the opening indicating rod 40 to pass through, and a large hole 131 is provided on the side of the through hole away from the body 11, which is coaxial with the through hole and forms an annular mounting groove with the outer side of the opening indicating rod 40;

[0045] The large hole 131 is coaxially arranged with the through hole and is interconnected. The large hole 131 is arranged on the side of the through hole away from the valve cover 10 and cooperates with the outer side of the opening indicator rod 40 to form an annular mounting groove, which is in a circular ring shape; the adjusting seal ring 4 is installed in the annular mounting groove and sleeved on the outer side of the opening indicator rod 40; the adjusting nut 2 is screwed so that the adjusting nut 2 squeezes the adjusting seal ring 4, thereby forming a sealing structure;

[0046] By twisting the adjusting nut 2, the tightness of the adjusting sealing ring 4 can be effectively adjusted, so that the adjusting sealing ring 4 can avoid excessive extrusion, and the service life of the adjusting sealing ring 4 can be effectively increased while satisfying the sealing requirement;

[0047] In some possible implementations,

[0048] The body 11 is provided with a through hole for the opening indicating rod 40 to pass through, and the body 11 is also provided with an annular groove 121 which is connected with the through hole and is used to install the sealing ring 3; the through hole, the through hole and the annular groove 121 are coaxially arranged so that the opening indicating rod 40 can move along its axial direction;

[0049] The annular groove 121 is in a circular ring shape and is used for installing the sealing ring 3;

[0050] The sealing ring 3 includes two sets of rubber sealing rings with the same structure, which are sleeved on the outside of the opening indicator rod 40. At this time, the annular groove 121 will be arranged in two sets corresponding to the sealing rings 3 one by one;

[0051] The adjusting sealing ring 4 is a rubber sealing ring.

[0052] In some possible implementations, in order to enable the connection portion 13 to effectively cooperate with the adjustment nut 2;

[0053] The connecting portion 13 is cylindrical, and an external thread is provided on the outer side thereof to which the sleeve portion 21 is screwed; a hole is provided on the closing cover 22 that is coaxial with the through hole and has the same diameter as the through hole.

[0054] In some possible implementations,

[0055] The adjusting nut 2 includes a sleeve portion 21 which is sleeved on the outside of the connecting portion 13 and connected to the connecting portion 13, a closing cover 22 which is connected to the side of the sleeve portion 21 away from the end cover 1 and for the opening indicating rod 40 to pass through, and an abutment tube 23 which is coaxially connected to the closing cover 22 and has one end away from the closing cover 22 extending into the annular mounting groove; the abutment tube 23 is sleeved on the outside of the opening indicating rod 40.

[0056] The sleeve portion 21 is sleeved on the outer side of the connecting portion 13 and is threadedly engaged with the connecting portion 13. By screwing the sleeve portion 21, the closing cover 22 and the abutment tube 23 can be driven to move axially along the opening indicator rod 40, so that the abutment tube 23 moves toward the side close to the adjusting sealing ring 4 and abuts against the adjusting sealing ring 4, thereby adjusting the tightness of the adjusting sealing ring 4.

[0057] In some possible implementations,

[0058] The abutting cylinder 23 is provided with a passage coaxial with and in communication with the hole and the through hole; the inner diameter of the passage is consistent with the inner diameter of the through hole.

[0059] on the other hand:

[0060] A control valve comprises a valve body 20, a valve cover 10 mounted on the valve body 20, a central shaft 30 mounted in the valve body 20, an opening indicator rod 40 connected to the central shaft 30 at one end and passing through the valve cover 10 at the other end, and the double sealing device as described above; the valve cover 10 and the valve body 20 are prior art and their internal structures are not described in detail here;

[0061] The control valve is a pump control valve, which is installed at the outlet of the water pump and plays the role of slow opening and slow closing;

[0062] When the pump is started, the valve is in a closed state. When the pressure rises to the set value, the valve slowly opens to avoid the large current shock caused by the no-load start of the water pump and realize the closed valve start function of the centrifugal pump; when the pump is stopped, the valve slowly closes;

[0063] When the pump is started, pressurized water flows in through the water supply pipe via the one-way valve, and the pump control valve controls the pressurized water to be discharged through the drain pipe on the valve body. Since the diameter of the drain pipe is much larger than the water supply pipe, the pump control valve is slowly opened. When the pump control valve is opened, the central axis 30 moves upward, driving the opening indicator rod 40 to move upward. At this time, the sealing of the opening indicator rod 40 is completed by the sealing ring 3 and the adjusting sealing ring 4. The tightness of the sealing ring 4 is adjusted by adjusting the tightness of the adjusting nut 2, thereby achieving the effect of sealing the pump control valve.

[0064] The present invention is not limited to the above-mentioned specific implementation modes, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A double sealing device for a valve opening indicator rod, characterized in that: It includes an end cover installed on the valve cover and sleeved on the outside of the opening indicator rod, a sealing ring sleeved on the outside of the opening indicator rod and located in the end cover, an adjusting sealing ring sleeved on the outside of the opening indicator rod and located in an annular mounting groove formed by the end cover and the opening indicator rod, and an adjusting nut sleeved on the outside of the end cover and extending into the annular mounting groove to squeeze the adjusting sealing ring.

2. A double sealing device for a valve opening indicator rod according to claim 1, characterized in that: The end cover comprises a body threaded with the valve cover and sleeved on the outside of the opening indicator rod, a support connected with the body and located outside the valve cover, and a connecting part arranged on a side of the support away from the body and connected to the adjusting nut.

3. A double sealing device for a valve opening indicator rod according to claim 2, characterized in that: The connecting portion is provided with a through hole for the opening indicating rod to pass through, and a large hole is provided on the side of the through hole away from the body, which is coaxial with the through hole and forms an annular mounting groove with the outer side of the opening indicating rod.

4. A double sealing device for a valve opening indicator rod according to claim 3, characterized in that: The main body is provided with a through hole for the opening indicating rod to pass through, and the main body is also provided with an annular groove which is communicated with the through hole and is used to install a sealing ring; the through hole, the through hole and the annular groove are coaxially arranged.

5. A double sealing device for a valve opening indicator rod according to claim 3, characterized in that: The adjusting nut includes a sleeve portion which is sleeved on the outside of the connecting portion and connected to the connecting portion, a closing cover which is connected to the side of the sleeve portion away from the end cover and for the opening indicating rod to pass through, and an abutment tube which is coaxially connected to the closing cover and has one end away from the closing cover extending into the annular mounting groove; the abutment tube is sleeved on the outside of the opening indicating rod.

6. A double sealing device for a valve opening indicator rod according to claim 5, characterized in that: The connecting portion is cylindrical, and an external thread is arranged on the outer side of the connecting portion, which is screwed to the sleeve portion; a hole is arranged coaxially with the through hole and has the same diameter as the through hole.

7. A double sealing device for a valve opening indicator rod according to claim 6, characterized in that: The abutting cylinder is provided with a channel which is coaxial with and communicates with the hole and the through hole; the inner diameter of the channel is consistent with the inner diameter of the through hole.

8. A double sealing device for a valve opening indicator rod according to claim 1, characterized in that: The sealing ring comprises two groups of rubber sealing rings with the same structure which are sleeved on the outside of the opening indicating rod; and the adjusting sealing ring is a rubber sealing ring.

9. A control valve, characterized in that: A valve body, a valve cover installed on the valve body, a central axis installed in the valve body, an opening indicator rod with one end connected to the central axis and the other end passing through the valve cover, and a double sealing device as described in any one of claims 1 to 8.

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