Quick-opening and closing gate valve

Abstract

The present invention discloses a quick-opening and closing gate valve, which includes a valve stem and a valve cover, and also includes a follower part and a positioning unit. The follower part is fixedly connected to the valve stem and can rotate and axially move along with the valve stem. The positioning unit is connected to the valve cover. When the valve stem is at the lower limit position, the follower part can rotate to a position where it cooperates with the positioning unit, and the axial movement and rotation of the follower part are restricted by the positioning unit. The opening and closing of the gate valve are achieved by directly pushing or pulling the valve stem axially. Compared with the conventional method of converting the rotation of a handwheel into the axial movement of the valve stem to achieve the opening and closing of the gate valve, the opening and closing speed is significantly improved. Therefore, it can meet the requirement of quick opening and closing.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear reactor engineering equipment, and in particular to a fast opening and closing gate valve. Background Art

[0002] The high temperature gas-cooled reactor is a nuclear reactor that uses helium as a coolant and graphite as a moderator. It can provide a primary nuclear heat medium with a temperature of up to 750°C. In addition to power generation, it is also widely used in the field of process heat. The reactor pressure vessel of the high temperature gas-cooled reactor is equipped with an irradiation channel and a built-in irradiation monitoring tube. After the high temperature gas-cooled reactor has been running for a certain period of time, the irradiation monitoring tube needs to be removed. Graphite dust exists in the reactor and is radioactive.

[0003] A special device is needed to remove the irradiation monitoring tube. The bottom of the device is a gate valve, which is connected to the irradiation monitoring tube interface of the reactor pressure vessel. After removing the monitoring tube from the irradiation channel, the gate valve needs to be closed to prevent graphite dust leakage.

[0004] Due to the limited space in the reactor pressure vessel compartment, electric gate valves cannot be used, and only manual gate valves can be used. The current manual gate valves all open and close the valve by rotating a handwheel that is threadedly connected to the valve stem. The thread pitch on the valve stem is not large, which results in a long time spent opening and closing the gate valve. The high-temperature gas-cooled reactor operation site hopes that the gate valve can be opened and closed quickly to reduce the radiation dose received by the operators. Obviously, the current gate valves cannot meet this requirement.

[0005] Therefore, as a person skilled in the art, it is necessary to improve the gate valve so that it can be opened and closed quickly. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a quick opening and closing gate valve, including a valve stem and a valve cover, and also including a follower and a positioning unit. The follower is fixedly connected to the valve stem and can rotate and move axially with the valve stem; the positioning unit is connected to the valve cover, and when the valve stem is in the lower limit position, the follower can rotate to a position cooperating with the positioning unit, and the axial movement and rotation of the follower are limited by the positioning unit.

[0007] In one embodiment, the positioning unit includes a first positioning portion for limiting the axial movement of the follower portion; the valve cover includes a support body, a receiving cavity for accommodating the follower portion is provided in the support body, and a first entrance and exit for the follower portion to enter and exit the receiving cavity is provided on the upper wall of the support body, and the upper cavity wall and the lower cavity wall of the receiving cavity constitute the first positioning portion.

[0008] In one embodiment, the positioning unit also includes a second positioning portion for limiting the rotation of the follower portion; the second positioning portion includes a positioning pin, the follower portion is provided with a positioning hole adapted to the positioning pin, the upper wall portion of the support body is provided with a second entrance and exit for the positioning pin to enter and exit the accommodating cavity, and the second entrance and exit are staggered with the first entrance and exit.

[0009] In one embodiment, a limiting boss is provided on the periphery of the positioning pin; the second positioning portion also includes an elastic member and a sleeve; the sleeve is sleeved on the periphery of the positioning pin, the sleeve is fixed to the support body and is provided with a limiting step surface inside; the elastic member is sleeved on the periphery of the positioning pin and compressed between the limiting step surface and the limiting boss, and the limiting boss is pressed tightly against the support body under the elastic force of the elastic member.

[0010] In one embodiment, the support body includes an annular connecting portion, which is formed by partially extending an upper wall portion of the support body upward, and the sleeve is connected to the annular connecting portion through a threaded pair.

[0011] In one embodiment, the second positioning portion further includes a handle, and the upper end of the positioning pin extends out of the sleeve and is connected to the handle.

[0012] In one embodiment, a through hole penetrating the accommodating cavity is provided on the lower wall of the support body, and the valve stem passes through the first inlet and outlet, the accommodating cavity and the through hole in sequence from top to bottom.

[0013] In one embodiment, a first limiting surface and a second limiting surface are provided on the side cavity wall of the accommodating cavity, and when the follower is in cooperation with the positioning unit, the follower abuts against the first limiting surface and the second limiting surface.

[0014] In one embodiment, the follower is provided with an internal threaded hole, the outer periphery of the valve stem is provided with an external thread matched with the internal threaded hole, and the follower is connected with the valve stem through a threaded pair.

[0015] The quick opening and closing gate valve provided in this solution realizes the opening and closing of the gate valve by directly pushing or pulling the valve stem to move axially. Compared with the previous method of opening and closing the gate valve by converting the rotation of the hand wheel into the axial movement of the valve stem, the opening and closing speed is significantly improved, and therefore, it can meet the quick opening and closing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A cross-sectional view of a specific embodiment of the fast opening and closing gate valve provided by the present invention;

[0017] Figure 2 for Figure 1An enlarged view of the middle support body, follower and valve stem;

[0018] Figure 3 for Figure 2 A top view of the valve stem is hidden in the figure;

[0019] Figure 4 for Figure 2 A top sectional view of the valve stem is hidden in the figure;

[0020] Figure 5 for Figure 1 Enlarged view of position A in the middle.

[0021] The following are the descriptions of the reference numerals:

[0022] 1 valve body, 2 sealing gasket, 3 packing, 4 packing gland, 5 valve seat, 6 gate, 7 valve stem, 8 handwheel;

[0023] 9 valve cover, 91 cover body, 92 neck, 93 rib connection part, 94 support body, 941 upper wall part, 942 lower wall part, 943 annular connection part, a accommodating cavity, a1 upper cavity wall, a2 lower cavity wall, a3 first limiting surface, a4 second limiting surface, b first inlet and outlet, c second inlet and outlet, d through hole;

[0024] 10 follower, 101 internal thread hole, 102 pin hole;

[0025] 11 positioning pin, 111 limiting boss;

[0026] 12 springs;

[0027] 13 sleeve, 131 limiting step surface;

[0028] 14Handle. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In the description of the present invention, the directions or positional relationships indicated by "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0030] like Figure 1 As shown, the quick opening and closing gate valve includes a valve body 1, a sealing gasket 2, a packing 3, a packing gland 4, a valve seat 5, a gate 6, a valve stem 7, a hand wheel 8, a valve cover 9, a follower 10 and a positioning unit, etc.

[0031] The valve cover 9 includes a cover body 91, a neck 92, a rib connection part 93 and a support body 94, and the four parts are integrally arranged, the neck 92 is arranged above the cover body 91, the support body 94 is arranged above the neck 92, and the rib connection part 93 extends from the outer circumference of the neck 92 to the support body 94. It should be noted that in actual implementation, the structure of the valve cover 9 is not limited to this.

[0032] The cover body 91 is fastened to the mounting surface of the valve body 1 by stud bolts, and the sealing gasket 2 is arranged between the cover body 91 and the mounting surface of the valve body 1 to play a sealing role.

[0033] The packing 3 is installed in the installation cavity of the neck 92 , and the packing gland 4 presses the packing 3 and is fixed to the neck 92 by fasteners.

[0034] The valve seat 5 is installed in the valve body 1, and one valve seat 5 is installed on the left and right. When the gate valve is closed, the gate plate 6 is located between the two valve seats 5 and is in sealing contact with the two valve seats 5.

[0035] The valve stem 7 is connected to the gate plate 6 by a limiting head, can rotate relative to the gate plate 6, and can drive the gate plate 6 to move up and down. A hand wheel 8 is provided at the top of the valve stem 7 to operate the valve stem 7. Of course, in actual implementation, the hand wheel 8 may not be provided.

[0036] The follower 10 is fixedly connected to the valve stem 7 and can move up and down and rotate with the valve stem 7. The positioning unit (the part indicated by A in the figure) is connected to the valve cover 9. When the valve stem 7 is in the lower limit position (i.e. Figure 1 In the state shown in FIG. 1 , the follower 10 can rotate to a position where it cooperates with the positioning unit, and the axial movement and rotation of the follower 10 are limited by the positioning unit.

[0037] With this structure, when the gate valve needs to be closed, the valve stem 7 is directly pushed downward to move the valve stem 7 to the lower limit position, and then the follower 10 is rotated to a position that matches the positioning unit (the follower 10 can be driven to rotate by rotating the valve stem 7, or the follower 10 can be directly rotated). Under the positioning action of the positioning unit, the follower 10 cannot move up and down or rotate, and accordingly, the valve stem 7 fixedly connected thereto and the gate plate limitedly connected to the valve stem 7 cannot move up and down, so the gate valve is stably maintained in a closed state. When the gate valve needs to be opened, the follower 10 is first rotated in the opposite direction to release it from the positioning unit, and then the valve stem 7 is pulled upward to open the gate valve.

[0038] This structure opens and closes the gate valve by directly pushing or pulling the valve stem 7 to move axially. Compared with the previous method of opening and closing the gate valve by converting the rotation of the hand wheel into the axial movement of the valve stem, the opening and closing speed is significantly improved, so it can meet the needs of rapid opening and closing.

[0039] Specifically, the positioning unit includes a first positioning portion and a second positioning portion, the first positioning portion is used to limit the upward and downward movement of the follower portion 10 , and the second positioning portion is used to limit the rotation of the follower portion 10 .

[0040] like Figure 2 As shown, a receiving chamber a for receiving the follower 10 is provided inside the support body 94 of the valve cover 9. The support body 94 has an upper wall portion 941 and a lower wall portion 942. The receiving chamber a is formed between the upper wall portion 941 and the lower wall portion 942. A first inlet and outlet b is provided on the upper wall portion 941 for the follower 10 to enter and exit the receiving chamber a. The upper chamber wall a1 and the lower chamber wall a2 of the receiving chamber a constitute the above-mentioned first positioning portion. A second inlet and outlet c is also provided on the upper wall portion 941 of the support body 94. The second inlet and outlet c is staggered with the first inlet and outlet b. Figure 5 As shown, the second positioning portion includes a positioning pin 11 , the second entrance c allows the second positioning pin 11 to enter and exit the accommodating chamber a, and a pin hole 102 adapted to the positioning pin 11 is provided on the follower portion 10 .

[0041] During the process of closing the gate valve, the valve stem 7 is pushed downward to allow the follower 10 to enter the accommodating chamber a from the first inlet and outlet b, and then the follower 10 is rotated so that a part of the follower 10 is located between the upper chamber wall a1 and the lower chamber wall a2 of the accommodating chamber a and the pin hole 102 on the follower 10 is aligned with the positioning pin 11 (i.e. Figure 2 and Figure 4 The state shown in the figure), and then the positioning pin 11 is inserted into the pin hole 102. The upper surface of the follower 10 and the upper cavity wall a1 constitute a limit pair for limiting the upward movement of the follower 10, the lower surface of the follower 10 and the lower cavity wall a2 constitute a limit pair for limiting the downward movement of the follower 10, and the outer circumference of the positioning pin 11 and the inner circumference of the pin hole 102 constitute a limit pair for limiting the rotation of the follower 10.

[0042] During the process of opening the gate valve, the positioning pin 11 is pulled out from the pin hole 102, and then the follower 10 is rotated to align with the first inlet and outlet b (i.e. Figure 3 The state shown in the figure), at this time, the follower 10 is completely located between the first inlet and outlet b and the lower chamber wall a2, and then the valve stem 7 is pulled upward to drive the follower 10 to pass through the first inlet and outlet b.

[0043] The above positioning unit uses the upper cavity wall a1 and the lower cavity wall a2 of the accommodating cavity a formed in the support body 94 to limit the up and down movement of the follower 10, and uses the positioning pin 11 installed on the support body 94 and the pin hole 102 provided on the follower 10 to limit the rotation of the follower 10. The positioning unit of this structure has high positioning reliability, high overall integration, and small required layout space. Of course, in actual implementation, the structure of the positioning unit is not limited to this, as long as the structure can limit the up and down movement and rotation of the follower 10 when the valve stem 7 is in the lower limit position, for example, a transverse hole can be opened on the support body 94 and the follower 10, so that the limit pin is simultaneously inserted into the transverse hole of the support body 94 and the transverse hole of the follower 10.

[0044] Further, such as Figure 5 As shown, a limiting boss 111 can be provided on the periphery of the positioning pin 11, and a spring 12 and a sleeve 13 are also provided. The sleeve 13 is sleeved on the periphery of the positioning pin 11, the sleeve 13 is fixed to the support body 94, and a limiting step surface 131 is provided inside the sleeve 13. The spring 12 is sleeved on the periphery of the positioning pin 11 and compressed between the limiting step surface 131 and the limiting boss 111, and the limiting boss 111 is tightly pressed against the upper wall portion 941 of the support body 94 under the elastic force of the spring 12. In this way, the elastic force of the spring 12 can be used to prevent the positioning pin 11 from accidentally falling out of the pin hole 102, thereby improving the safety of the gate valve.

[0045] Specifically, Figure 5 As shown, the support body 94 may also include an annular connecting portion 943, which is formed by extending upward from a portion of the upper wall portion 941. The annular connecting portion 943 and the sleeve 13, one of which is provided with an internal thread and the other with an external thread, are connected together by a thread pair. In the figure, the internal thread is provided on the annular connecting portion 943, and the external thread is provided on the sleeve 13.

[0046] Further, such as Figure 5 As shown, a handle 14 may also be provided, so that the upper end of the positioning pin 11 extends out of the sleeve 13 and is connected to the handle 14 . During use, the positioning pin 11 is driven to move axially by holding the handle 14 .

[0047] Further, such as Figure 4 As shown, a first limit surface a3 and a second limit surface a4 can be set on the side cavity wall of the accommodating cavity a. When the follower part 10 rotates along the first direction (the direction of the arrow in the figure) to the position where the pin hole 102 is aligned with the positioning pin 11, the follower part 10 abuts against the first limit surface a3 and the second limit surface a4, and can no longer continue to rotate along the first direction. Therefore, the operator can determine that the follower part 10 has been rotated into place, thereby further shortening the time required to close the valve.

[0048] It is preferred to set an internal thread hole 101 on the follower 10, and set an external thread on the outer periphery of the valve stem 7 (the length of the thread does not need to be too long, as long as it meets the connection requirements of the follower 10), so that the follower 10 and the valve stem 7 are connected together through a threaded pair. When using this type of follower 10, when closing the valve, after the positioning unit completes the positioning, the valve stem 7 is slightly rotated to tighten the valve stem 7 and the follower 10, so that the valve stem 7 can be locked and the position of the valve stem 7 is more stable. Of course, in actual implementation, the follower 10 can also be fixedly connected to the valve stem 7 by other means, such as riveting, welding, etc.

[0049] The above-mentioned fast opening and closing gate valve can be applied to high temperature gas-cooled reactors, and can be installed on the special device for removing the irradiation monitoring tube of the high temperature gas-cooled reactor. Since the above-mentioned fast opening and closing gate valve has a fast opening and closing speed, it can shorten the operator's stay time in the high radiation area when taking parts from the irradiation channel, thereby reducing the operation risk.

[0050] The above is a detailed introduction to the fast opening and closing gate valve provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A quick opening and closing gate valve, comprising a valve stem (7) and a valve cover (9), It is characterized in that It also includes a follower (10) and a positioning unit, wherein the follower (10) is fixedly connected to the valve stem (7) and can rotate and move axially with the valve stem (7); the positioning unit is connected to the valve cover (9), and when the valve stem (7) is in the lower limit position, the follower (10) can rotate to a position that cooperates with the positioning unit, and the axial movement and rotation of the follower (10) are restricted by the positioning unit; The positioning unit comprises a first positioning portion for limiting the axial movement of the follower portion (10); the valve cover (9) comprises a support body (94); a receiving cavity (a) for receiving the follower portion (10) is provided in the support body (94); an upper cavity wall (a1) and a lower cavity wall (a2) of the receiving cavity (a) constitute the first positioning portion; The positioning unit also includes a second positioning portion for limiting the rotation of the follower portion (10); the second positioning portion includes a positioning pin (11), the follower portion (10) is provided with a pin hole (102) adapted to the positioning pin (11), and the upper wall portion (941) of the support body (94) is provided with a second entrance (c) for the positioning pin (11) to enter and exit the accommodating cavity (a).

2. The fast opening and closing gate valve according to claim 1, It is characterized in that The upper wall portion (941) of the support body (94) is provided with a first entrance (b) for the follower portion (10) to enter and exit the accommodating chamber (a).

3. The fast opening and closing gate valve according to claim 2, It is characterized in that The second entrance and exit (c) are staggered with the first entrance and exit (b).

4. The fast opening and closing gate valve according to claim 3, It is characterized in that The outer periphery of the positioning pin (11) is provided with a limiting boss (111); the second positioning portion also includes a spring (12) and a sleeve (13); the sleeve (13) is sleeved on the outer periphery of the positioning pin (11), the sleeve (13) is fixed to the support body (94) and is provided with a limiting step surface (131) inside; the spring (12) is sleeved on the outer periphery of the positioning pin (11) and is compressed between the limiting step surface (131) and the limiting boss (111), and the limiting boss (111) is pressed tightly against the support body (94) under the elastic force of the spring (12).

5. The fast opening and closing gate valve according to claim 4, It is characterized in that The support body (94) comprises an annular connecting portion (943), wherein the annular connecting portion (943) is formed by partially extending an upper wall portion (941) of the support body (94) upward, and the sleeve (13) and the annular connecting portion (943) are connected together via a threaded pair.

6. The fast opening and closing gate valve according to claim 4, It is characterized in that The second positioning portion also includes a handle (14), and the upper end of the positioning pin (11) extends out of the sleeve (13) and is connected to the handle (14).

7. According to claim 2, the fast opening and closing gate valve, It is characterized in that The lower wall portion (942) of the support body (94) is provided with a through hole (d) that penetrates the accommodating cavity (a), and the valve stem (7) passes through the first inlet and outlet (b), the accommodating cavity (a) and the through hole (d) in sequence from top to bottom.

8. The fast opening and closing gate valve according to any one of claims 2 to 7, It is characterized in that A first limiting surface (a3) ​​and a second limiting surface (a4) are provided on the side cavity wall of the accommodating cavity (a); when the follower (10) is in a state of cooperation with the positioning unit, the follower (10) abuts against the first limiting surface (a3) ​​and the second limiting surface (a4).

9. The fast opening and closing gate valve according to any one of claims 1 to 7, It is characterized in that The follower part (10) is provided with an internal thread hole (101), the outer periphery of the valve stem (7) is provided with an external thread matching the internal thread hole (101), and the follower part (10) and the valve stem (7) are connected together via a threaded pair.

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