CN215487719U - Guide sleeve, throttle valve and fracturing manifold - Google Patents

Abstract

The utility model discloses a guide sleeve, a throttle valve and a fracturing manifold, relates to the technical field of valves, and aims to solve the technical problem that a valve rod of the throttle valve is easy to deform or break under the scouring action of high-pressure fluid in the related technology. This uide bushing is installed in the valve body, and the uide bushing includes first direction section, and first direction section has the direction chamber that runs through first direction section, and the gliding guide chamber of wearing to locate of valve rod, first direction section are fixed to be pegged graft in the valve rod intracavity. Wherein, along the axial of valve rod, first direction section extends to in the runner for shelter from the partial valve rod that is located the runner. The guide sleeve is used for protecting the valve rod.

Description

Guide sleeve, throttle valve and fracturing manifold

Technical Field

The utility model relates to the technical field of valves, in particular to a guide sleeve, a throttle valve and a fracturing manifold.

Background

The throttle valve is a valve for controlling fluid flow by changing the throttling section of a flow passage through a valve rod, and is widely applied to operation scenes such as fluid conveying, fluid pressure testing and the like. In the related art, when the throttle valve is used for throttling control of high-pressure fluid, the valve rod is very easy to deform under the high-speed scouring action of the high-pressure fluid, so that the valve rod cannot smoothly return to an initial position, even the valve rod is directly broken under the high-speed scouring action of the high-pressure fluid, and finally the problem of fluid flow control failure is caused.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a guide sleeve, a throttling valve and a fracturing manifold, and aims to solve the technical problem that a valve rod of the throttling valve is easy to deform or break under the scouring action of high-pressure fluid in the related technology.

In order to achieve the above purpose, the embodiment of the utility model adopts the following technical scheme:

the utility model provides a valve rod cavity, valve rod cavity is used for installing the valve rod that uide bushing, installs in the valve body, still is provided with the runner in the valve body and sets up with the runner intercommunication. The uide bushing includes first direction section, and first direction section has the direction chamber that runs through first direction section, and the gliding guide chamber of wearing to locate of valve rod, the fixed grafting in the valve rod intracavity of first direction section. Wherein, along the axial of valve rod, first direction section extends to in the runner for shelter from the partial valve rod that is located the runner.

This application makes the valve rod can directionally slide in the direction intracavity of uide bushing through set up the uide bushing in the valve rod intracavity of valve body. Because the first guide section of the guide sleeve extends into the flow channel, the high-pressure fluid scouring force in the flow channel directly acts on the first guide section. Compared with the throttling valve in the prior art, the high-pressure fluid scouring force in the flow channel is not directly acted on the valve rod, so that the first guide section can play an effective protection role on the valve rod extending into the flow channel, the deformation or breakage of the valve rod is reduced, and the service life of the throttling valve is prolonged relatively.

In some embodiments, a piston sleeve is connected to the valve body, the piston sleeve is provided with a piston cavity, and the piston cavity is communicated with the valve rod cavity. The guide sleeve further comprises a second guide section, the second guide section is connected with the first guide section and located in the piston cavity, and the guide cavity further penetrates through the second guide section. The second guide section can play the effect of direction to the valve rod. In addition, the piston arranged in the piston sleeve can be limited, and the problem that the throttle valve is subjected to pressure building is solved. Moreover, the second guide section can also play a role of guiding the elastic element arranged in the piston sleeve.

In some embodiments, the guide sleeve further comprises a first seal groove and a second seal groove. The first seal groove is arranged along the circumferential direction of the outer wall of the first guide section and used for installing a first seal ring so as to seal a gap between the guide sleeve and the valve body. The second seal groove is circumferentially arranged along the inner wall of the guide sleeve and used for mounting a second seal ring so as to seal a gap between the guide sleeve and the valve rod. The first sealing ring and the second sealing ring can seal high-pressure fluid in the flow channel, and the problem that the high-pressure fluid corrodes the piston or the elastic part due to the fact that the high-pressure fluid flows into the piston cavity is avoided.

In some embodiments, the guide sleeve further comprises a first guide slot. The first guide groove is circumferentially arranged along the inner wall of the guide sleeve and is used for installing a first guide ring so as to limit the radial movement of the valve rod along the guide cavity. The valve rod moves along the axial direction of the guide cavity, and the clamping stagnation of the valve rod is avoided.

In some embodiments, the guide sleeve further comprises a first stop collar coupled to the first guide section. The first limiting ring is arranged along the circumferential direction of the outer wall of the first guide section and is abutted against the side wall, far away from the flow channel, of the valve body. First spacing ring and valve body butt can effectively guarantee the axiality between direction chamber and the valve rod chamber, avoids the uide bushing because the installation is crooked and arouses the problem of valve rod jamming.

The embodiment of the other aspect of the utility model also provides a throttle valve, which comprises a valve body, a valve rod and the guide sleeve in any technical scheme, wherein the guide sleeve is arranged in the valve body, and the valve rod penetrates through the guide sleeve. When the guide sleeve is used for the throttle valve, the technical effect of the guide sleeve is the same as that of the guide sleeve provided by the embodiment, and the description is omitted here.

In some embodiments, the throttle valve further comprises a piston sleeve, a piston, and a resilient member. The piston sleeve is connected with the valve body, a piston cavity is formed in the piston sleeve and communicated with the valve rod cavity, a liquid inlet hole is formed in the side wall, arranged in the radial direction of the piston sleeve, and the liquid inlet hole is communicated with the piston cavity. The piston is arranged in the piston cavity along the axial sliding of the piston sleeve, and one end of the valve rod, which is far away from the flow passage, is connected with the piston. One end of the elastic part is abutted with the guide sleeve, and the other end of the elastic part is abutted with the piston.

When hydraulic pressure is injected into the piston cavity from the liquid inlet hole, the piston is pushed by the hydraulic pressure to drive the valve rod to move along the axial direction of the guide cavity. When the throttle valve does not need throttling, the piston is reset under the pushing action of the elastic piece, so that the throttle valve realizes the function of hydraulic remote control, and the operation is safer.

In some embodiments, the piston includes a piston seat and a piston post. The piston seat is arranged in the piston cavity in a sliding manner along the axial direction of the piston sleeve. The piston post is connected with the piston seat and faces one side of the valve rod, and the outer diameter of the piston post is smaller than that of the piston seat. Along the axial of piston post, the slot has been seted up to the piston post, and the valve rod is pegged graft in the slot, and the internal diameter of piston post is greater than the external diameter of valve rod. The side wall of the piston column and the valve rod are provided with through holes, pin shafts are inserted in the through holes, and the valve rod is hinged with the piston column through the pin shafts.

Set up the piston into the structure mode that piston seat and piston post are connected for the valve rod can be convenient articulated with the piston post, thereby make the valve rod along direction chamber axial displacement's in-process, can eliminate being connected between piston sleeve and the valve body because there is the axiality deviation, perhaps the problem of valve rod jamming that part processing dimensional tolerance arouses, thereby reduced the processing degree of difficulty of work piece.

In some embodiments, the pin is a resilient cylindrical pin. The elastic cylindrical pin has good flexibility, so that the valve rod can freely rotate in the slot of the piston column, and the axial movement of the valve rod in the guide cavity is facilitated.

In some embodiments, the piston seat includes a third seal groove and a second guide groove. The third seal groove is arranged along the circumferential direction of the outer wall of the piston seat and used for installing a third seal ring so as to seal a gap between the piston seat and the piston sleeve. The second guide groove is arranged along the circumferential direction of the outer wall of the piston seat and used for installing a second guide ring so as to limit the radial movement of the piston seat along the piston cavity. The third sealing ring can play a sealing role in hydraulic pressure in the piston cavity, and liquid is prevented from flowing into the space between the piston and the guide sleeve. The second guide ring can enable the piston seat to move along the axial direction of the piston cavity, and clamping stagnation of the piston is avoided.

In some embodiments, the flow passages include first and second flow passages that are angularly disposed, and the stem cavity is coaxially disposed with the second flow passage. The throttling valve further comprises a valve seat connected in the second flow channel, a seat sleeve is installed in the valve seat, and a seat cavity communicated with the second flow channel is formed in the seat sleeve. When the valve rod moves towards the valve seat, the pressure of fluid in the valve seat is greater than the pressure of the flow channel, and the setting of the seat sleeve can avoid the direct scouring of the second flow channel by high-pressure fluid, so that the service life of the valve body is prolonged.

In some embodiments, the end of the valve stem facing the sleeve is provided with a conical shape, and the end of the sleeve facing the valve stem is provided with a conical mouth shape matched with the conical shape. The conical surface shape design of the valve rod can reduce the contact area of the valve rod and high-pressure fluid, so that the scouring acting force of the fluid on the valve rod is reduced. The conical opening shape design of the seat sleeve can increase the length of a throttling channel formed between the seat sleeve and the valve rod, so that the pressure of fluid is reduced.

In some embodiments, the valve seat includes a fourth seal groove and a second retaining ring. The fourth seal groove is arranged along the circumferential direction of the outer wall of the valve seat and used for installing a fourth seal ring so as to seal a gap between the valve seat and the valve body. The second limiting ring is arranged along the circumferential direction of the outer wall of the valve seat and is abutted against the side wall, facing the valve rod cavity, of the second flow passage. The throttle valve further comprises a gasket, the gasket is arranged between the second limiting ring and the valve body, and the connecting part between the valve seat and the valve body is located between the fourth sealing ring and the gasket. The fourth sealing ring and the gasket can effectively protect the connecting part between the valve seat and the valve body, so that the connecting part is prevented from being corroded by fluid.

The embodiment of the other aspect of the utility model also provides a fracturing manifold, which comprises at least two pipelines and the throttle valve in any technical scheme, wherein the throttle valve is connected between every two adjacent pipelines, and the two adjacent pipelines are respectively communicated with the flow passages of the throttle valve. When the throttle valve is used for a fracturing manifold, the technical effects of the throttle valve are the same as those of the throttle valve provided by the previous embodiment, and the details are not repeated here.

Drawings

Fig. 1 is a schematic structural diagram of a fracturing manifold provided in an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of the throttle valve of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the valve body of FIG. 2;

FIG. 4 is a schematic view of a half-section of the guide sleeve of FIG. 2;

FIG. 5 is an enlarged view of a portion of the guide sleeve of FIG. 2 attached to the valve body;

FIG. 6 is a schematic perspective view of the piston of FIG. 2;

FIG. 7 is an enlarged view of a portion of the piston and sleeve connection of FIG. 2;

fig. 8 is an enlarged view of a portion of the valve seat and valve body of fig. 2.

Reference numerals:

100-a throttle valve;

110-a valve body; 111-a first flow channel; 112-a second flow channel; 113-a stem cavity; 114-a connecting lumen;

120-a valve stem;

130-a guide sleeve; 131-a first stop collar; 132-a first guide section; 1321 — a first seal groove; 1322-a second seal groove; 1323 — a first guide groove; 1324-a first seal ring; 1325-a second seal ring; 1326-a first guide ring; 133-a second guide section; 134-a guide cavity;

140-a piston sleeve; 141-a piston cavity; 142-a liquid inlet hole;

150-a piston; 151-piston seat; 1511-a third seal groove; 1512-a second guide groove; 1513-third seal ring; 1514-a second guide ring; 152-a piston column; 1521-slot; 153-pin shaft;

160-an elastic member;

170-valve seat; 1701-a second stop collar; 171-seat cover; 1711-seat cavity; 172-a fourth seal ring; 173-a washer;

200-pipeline.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present application provides a fracturing manifold, as shown in fig. 1, comprising a choke 100 and two conduits 200. The two pipes 200 may be perpendicular to each other, may be arranged coaxially, or may be arranged at an angle according to different structures of the throttle valve 100. Both ends of the throttle valve 100 are connected to the pipes 200 by means of a flange or a clamp, respectively, so that the two adjacent pipes 200 are communicated with the flow passage of the throttle valve 100, respectively, thereby controlling the flow rate of gas or liquid (hereinafter, collectively referred to as fluid) in the pipes 200.

The fracturing manifold is used for filling high-pressure fluid into the oil and gas operation well so as to provide fracturing well cementation equipment test or fracturing operation requirements of the oil and gas operation well. Of course, the fracturing manifold is not limited to two pipes 200, and may include more pipes 200 according to the operation requirement, and adjacent pipes 200 may be connected by the throttle valve 100. Besides the pipeline 200, the connection with the throttle valve 100 may be a structure such as a fluid outlet of a fracturing truck or a tee joint.

In the related technology, the highest fluid pressure tested by the fracturing well cementation equipment can reach 140 MPa. The valve stem 120 provided in the throttle valve 100 is easily deformed or broken by the high-speed flushing action of the high-pressure fluid. In order to solve the technical problem, the present application further provides a throttle valve 100, as shown in fig. 2, the throttle valve 100 includes a valve body 110, a valve stem 120, and a guide sleeve 130. The valve body 110 is provided therein with a first flow passage 111 and a second flow passage 112 which are perpendicular to and communicate with each other. Of course, the first flow passage 111 and the second flow passage 112 may be arranged coaxially or at an angle according to the usage of the throttle valve 100.

On the basis, as shown in fig. 3, the valve body 110 is further provided with a valve rod cavity 113, the valve rod cavity 113 is communicated with the first flow passage 111 and is coaxially arranged with the second flow passage 112, and the guide sleeve 130 is inserted in the valve rod cavity 113. Specifically, as shown in fig. 4, the guide sleeve 130 includes a first stop collar 131 circumferentially disposed along an outer wall of the guide sleeve 130. The guide sleeve 130 is divided into a first guide section 132 and a second guide section 133 by the first limiting ring 131, and the guide sleeve 130 is further provided with a guide cavity 134 penetrating through the first guide section 132 and the second guide section 133.

The first guide section 132 is inserted into the valve rod cavity 113, the first guide section 132 further extends into the first flow channel 111, and the valve rod 120 is slidably disposed through the guide cavity 134. Of course, the guide sleeve 130 may also be provided with only the first guide section 132, without the second guide section 133. At this time, the first retainer 131 is located at one end of the guide sleeve 130.

It will be appreciated that the first stop collar 131 is capable of stopping the guide sleeve 130 against the outer sidewall of the valve stem cavity 113. In order to improve the stability of the connection between the guide sleeve 130 and the valve body 110, an external thread may be provided on the outer wall of the first guide section 132 and an internal thread may be provided on the sidewall of the stem cavity 113, so that the guide sleeve 130 is threadedly coupled with the valve body 110 to prevent the guide sleeve 130 from axially moving within the stem cavity 113. Of course, the guide sleeve 130 and the valve body 110 may be connected by an interference connection instead of a threaded connection. If the guide sleeve 130 is connected to the valve body 110 by a screw connection or an interference connection, the first limit ring 131 may be omitted.

When the valve rod 120 moves axially in the guide cavity 134, the guide sleeve 130 is arranged to extend the guide length compared with the valve rod cavity 113, so that the movement of the valve rod 120 can be centered, and the problem of clamping stagnation of the valve rod 120 caused by deflection is avoided. Of course, the provision of the second guide section 133 further extends the guide length of the guide sleeve 130. In addition, the first limit ring 131 is abutted to the valve body 110, so that the coaxiality between the guide cavity 134 and the valve rod cavity 113 can be effectively ensured, and the problem that the guide sleeve 130 is clamped by the valve rod 120 due to installation deflection is avoided.

In order to ensure the sealing performance between the guide sleeve 130 and the valve body 110, as shown in fig. 4, a first sealing groove 1321 is formed in the circumferential direction of the outer wall of the first guide section 132, and a second sealing groove 1322 is formed in the circumferential direction of the inner wall of the guide sleeve 130. As shown in fig. 5, a first sealing ring 1324 is installed in the first sealing groove 1321 to seal a gap between the guide sleeve 130 and the valve body 110. A second sealing ring 1325 is installed in the second sealing groove 1322 to seal a gap between the guide sleeve 130 and the valve stem 120. The first sealing ring 1324 and the second sealing ring 1325 may be made of rubber or silica gel having good sealing performance.

As shown in fig. 4, a first guide groove 1323 is further formed in the circumferential direction of the inner wall of the guide sleeve 130. As shown in fig. 5, a first guide ring 1326 is installed in the first guide groove 1323 to limit the radial movement of the valve stem 120 along the guide chamber 134, i.e., to ensure the axial movement of the valve stem 120 along the guide chamber 134. The first guide ring 1326 may be made of polytetrafluoroethylene or other material with good wear resistance. Of course, the number of the first sealing ring 1324, the second sealing ring 1325 and the first guiding ring 1326 may be set to one, two or more according to actual needs, and the specific number of the first sealing ring 1324, the second sealing ring 1325 and the first guiding ring 1326 is not particularly limited in this application.

When the high-pressure fluid flows into the valve body 110 from the first flow passage 111, the first guide section 132 can shield a portion of the valve stem 120 because the first guide section 132 extends into the first flow passage 111. The scouring force of the high-pressure fluid directly acts on the surface of the first guide section 132 instead of directly acting on the surface of the valve rod 120, so that the valve rod 120 is effectively protected, the deformation or fracture of the valve rod 120 is reduced, and the service life of the throttle valve 100 is relatively prolonged. Of course, the specific length of the first guide section 132 extending into the first flow passage 111 can be adjusted adaptively according to the aperture of the first flow passage 111 in different throttle valves 100.

In addition, in order to realize the remote control of the throttle valve 100, as shown in fig. 2, a piston sleeve 140 is further connected to the valve body 110, and a piston chamber 141 is provided in the piston sleeve 140. Specifically, as shown in fig. 3, the valve body 110 is further opened with a connection chamber 114, and the stem chamber 113 is communicated with the connection chamber 114 and coaxially arranged. The piston sleeve 140 has a cylindrical structure, and an external thread is formed on an outer wall of an opening side of the piston sleeve 140, and an internal thread is formed on a side wall of the connection chamber 114, so that the piston sleeve 140 is threadedly coupled with the valve body 110. At this time, the second guide section 133 of the guide sleeve 130 is located in the piston chamber 141. Of course, the piston sleeve 140 and the valve body 110 may be connected by other connection methods such as a snap or a bolt, and the application does not specifically limit the connection method between the piston sleeve 140 and the valve body 110.

Wherein the bore diameter of the connection chamber 114 is larger than the bore diameter of the stem chamber 113. When the piston sleeve 140 is coupled to the valve body 110, the piston sleeve 140 may also press the first retainer ring 131 of the guide sleeve 130 against the outer sidewall of the valve stem chamber 113. Thereby further securing the guide sleeve 130 to the valve body 110 and preventing axial movement of the guide sleeve 130 along the stem cavity 113. Of course, at this time, it is not necessary to provide an external thread on the outer wall of the first guide section 132, or it is not necessary to adopt a way of interference connection between the guide sleeve 130 and the valve body 110, so that the guide sleeve 130 can be stably connected in the valve rod cavity 113 of the valve body 110.

On this basis, as shown in fig. 2, a piston 150 is disposed in the piston chamber 141, an elastic member 160 is disposed between the piston 150 and the guide sleeve 130, and one end of the valve stem 120 located outside the first flow passage 111 is connected to the piston 150. Specifically, as shown in fig. 6, the piston 150 includes a piston seat 151 and a piston post 152. The piston seat 151 and the piston post 152 may be integrally formed, or may be connected by a screw thread, a bolt, an interference connection, or the like. The piston 150 drives the valve rod 120 to move axially in the piston cavity 141, so as to realize the function of adjusting the flow rate of the fluid in the flow passage through the valve rod 120.

As shown in fig. 6, the outer diameter of the piston seat 151 is adapted to the bore diameter of the piston chamber 141, and the outer diameter of the piston post 152 is smaller than the outer diameter of the piston seat 151. The piston post 152 is provided with a slot 1521 at one end facing the valve rod 120, the valve rod 120 is inserted into the slot 1521, and the outer diameter of the valve rod 120 is smaller than the aperture of the slot 1521. In addition, a through hole (not shown) is formed in the side wall of the piston column 152 and the valve rod 120, a pin 153 is inserted into the through hole, and the valve rod 120 is hinged to the piston column 152 through the pin 153, so that the valve rod 120 can slightly rotate in the piston column 152.

Since there may be a tolerance in the machining dimensions of the piston bush 140 and the valve body 110, there is a problem in that the coaxiality between the piston bush 140 and the valve body 110 is deviated after the piston bush 140 is coupled to the valve body 110. The valve stem 120 is hinged to the piston post 152 such that the valve stem 120 can rotate slightly relative to the piston post 152, thereby avoiding the problem of jamming of the valve stem 120 due to misalignment of the concentricity between the piston sleeve 140 and the valve body 110. The pin 153 may be an elastic cylindrical pin. The axial fluting of elasticity cylindric lock for elasticity cylindric lock possesses good pliability and anti-shear property. The resilient cylindrical pin can also act in concert to deform as the valve stem 120 is rotated slightly within the socket 1521.

In order to ensure the sealing performance between the piston 150 and the piston sleeve 140, as shown in fig. 6, a third sealing groove 1511 and a second guide groove 1512 are formed in the outer circumferential surface of the piston seat 151. As shown in fig. 7, a third seal groove 1513 is installed in the third seal groove 1511 to seal a gap between the piston seat 151 and the piston sleeve 140. A second guide ring 1514 is mounted in the second guide channel 1512 to limit the radial movement of the piston holder 151 along the piston chamber 141, i.e. to ensure that the piston holder 151 moves axially along the piston chamber 141.

The third seal ring 1513 may be made of rubber or silica gel with good sealing performance, and the second guide ring 1514 may be made of polytetrafluoroethylene with good wear resistance. Of course, the number of the third sealing rings 1513 and the second guiding rings 1514 may be one, two, or more according to actual needs, and the specific number of the third sealing rings 1513 and the second guiding rings 1514 is not particularly limited in this application.

On the basis, as shown in fig. 7, a liquid inlet hole 142 is formed in a side wall of the piston sleeve 140 disposed along the radial direction, the liquid inlet hole 142 is communicated with the piston cavity 141, and the liquid inlet hole 142 and the valve rod 120 are respectively located at two sides of the piston 150. The elastic member 160 may be a spring or a disc spring. One end of the elastic member 160 abuts against the first limiting ring 131 of the guide sleeve 130, the other end of the elastic member 160 abuts against the piston seat 151 of the piston 150, and the piston post 152, the valve rod 120 and the second guide section 133 are all sleeved in the inner cavity of the elastic member 160.

When the liquid inlet hole 142 is connected with the hydraulic mechanism through a hydraulic pipe, the function of remote control of the throttle valve 100 can be realized. At this time, the hydraulic mechanism injects hydraulic pressure into the piston cavity 141 through the liquid inlet hole 142, the hydraulic pressure pushes the piston 150 to axially move in the piston cavity 141, and the piston 150 drives the valve rod 120 to move towards the second flow channel 112, so as to adjust the flow rate of the fluid. After the hydraulic mechanism releases pressure, the valve rod 120 is reset under the elastic action of the elastic member 160 and the pressure action of the high-pressure fluid, so that the function of remote stepless regulation and control of the throttle valve 100 is realized.

Of course, the liquid inlet 142 may be connected to a gas compression mechanism through a pipeline, and the gas medium may be used to push the piston 150 to move, so as to implement the remote control function of the throttle valve 100. However, since the compressed volume of gas is large, in order to ensure the accuracy of the remote control of the throttle valve 100, it is preferable to use a liquid having a small compressed volume as a medium for moving the piston 150.

In addition, due to the arrangement of the second guide section 133 in the guide sleeve 130, the guide sleeve not only can guide and centralize the movement of the valve rod 120. Meanwhile, when the piston 150 moves to the second guide section 133, the piston column 152 is in limit abutment with the second guide section 133, and the second guide section 133 can also play a limit role in the piston 150, so that the valve rod 120 is prevented from directly blocking the second flow passage 112, the problem that the throttle valve 100 is suppressed is prevented, and the use safety of the throttle valve 100 is ensured. On the other hand, the second guide section 133 can also guide the extension and retraction of the elastic member 160, thereby preventing the elastic member 160 from being stuck.

In some embodiments, the second flow passage 112 of the valve body 110 is susceptible to erosion damage due to the increased pressure of the throttled fluid. As shown in fig. 2, a valve seat 170 is further provided in the second flow passage 112 of the valve body 110. Specifically, as shown in fig. 8, a seat cover 171 is installed in the valve seat 170, and a seat cavity 1711 communicating with the second flow passage 112 is provided in the seat cover 171. The seat cover 171 may be embedded in the valve seat 170 by shrink fitting or interference fit. Meanwhile, hard alloy powder can be sprayed on the inner wall of the seat cover 171 to enhance the erosion resistance of the seat cover 171. Alternatively, the sleeve 171 may be made directly of cemented carbide.

In order to further reduce the erosion of the valve stem 120 and the sleeve 171 by the high-pressure fluid, the end of the valve stem 120 facing the sleeve 171 is provided with a conical shape, and the end of the sleeve 171 facing the valve stem 120 is provided with a conical mouth shape matching the conical shape. Wherein, the shape of the conical surface reduces the contact area between the end of the valve rod 120 extending into the first flow channel 111 and the high-pressure fluid, thereby reducing the erosion effect of the high-pressure fluid on the valve rod 120.

Further, when the valve stem 120 moves toward the valve seat 170, a throttle passage is formed between the tapered mouth shape of the seat cover 171 and the tapered face shape of the valve stem 120, and the length of the throttle passage becomes longer as the valve stem 120 continues to move. When high-pressure fluid flows into the throttling passage, the pressure of the fluid is gradually reduced along with the increase of the length of the throttling passage, so that the structural design of the conical opening shape of the seat sleeve 171 and the conical shape of the valve rod 120 is also beneficial to reducing the pressure of the fluid.

If the seat cover 171 is disposed along the entire length of the second flow passage 112, erosion of the side wall of the second flow passage 112 by the fluid can be completely prevented. When the seat cover 171 is damaged by erosion, the throttle valve 100 can be continuously used only by replacing the valve seat 170, so that the use cost of the throttle valve 100 is reduced, and the service life of the throttle valve 100 is prolonged. Of course, it is also possible to spray a hard alloy powder on the portion of the valve stem 120 that contacts the fluid to enhance the erosion resistance of the valve stem 120. Alternatively, the valve stem 120 is made directly from cemented carbide.

In order to ensure the sealing performance between the valve seat 170 and the valve body 110, as shown in fig. 8, a fourth sealing groove (not shown) is formed in the circumferential direction of the outer wall of the valve seat 170, and a fourth sealing ring 172 is installed in the fourth sealing groove to seal a gap between the valve seat 170 and the valve body 110. Meanwhile, a second retainer ring 1701 is further provided in the circumferential direction of the outer wall of the valve seat 170, and the second retainer ring 1701 abuts on the side wall of the second flow passage 112 facing the stem cavity 113.

Wherein a gasket 173 is installed between the second retainer ring 1701 and the valve body 110. On the one hand, the gasket 173 can function to prevent the valve seat 170 from colliding with the valve body 110 under the fluid flushing action; on the other hand, the gasket 173 can also function to seal a gap between the valve seat 170 and the valve body 110. Further, the valve seat 170 may be coupled to the valve body 110 by a threaded connection, an interference connection, or the like. When the fourth sealing ring 172 and the gasket 173 are disposed at both sides of the connection portion of the valve seat 170 and the valve body 110, it is also possible to prevent the fluid from corroding the connection portion.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (14)

1. The guide sleeve is characterized by being arranged in a valve body, a flow passage is further arranged in the valve body, a valve rod cavity communicated with the flow passage is formed in the valve body, and the valve rod cavity is used for installing a valve rod;

the guide sleeve comprises a first guide section, the first guide section is provided with a guide cavity penetrating through the first guide section, the valve rod is slidably arranged in the guide cavity in a penetrating manner, and the first guide section is fixedly inserted in the valve rod cavity;

the first guide section extends into the flow channel along the axial direction of the valve rod and is used for shielding part of the valve rod in the flow channel.

2. The guide sleeve of claim 1, wherein a piston sleeve is connected to the valve body, the piston sleeve is provided with a piston cavity, and the piston cavity is communicated with the valve rod cavity;

the guide sleeve further comprises a second guide section, the second guide section is connected with the first guide section and located in the piston cavity, and the guide cavity further penetrates through the second guide section.

3. The guide sleeve of claim 2, further comprising a first seal groove and a second seal groove;

the first sealing groove is arranged along the circumferential direction of the outer wall of the first guide section and used for mounting a first sealing ring so as to seal a gap between the guide sleeve and the valve body;

the second seal groove is arranged along the circumferential direction of the inner wall of the guide sleeve and used for installing a second seal ring to seal a gap between the guide sleeve and the valve rod.

4. The guide sleeve of claim 2, further comprising a first guide slot;

the first guide groove is circumferentially arranged along the inner wall of the guide sleeve and used for installing a first guide ring so as to limit the radial movement of the valve rod along the guide cavity.

5. The guide bushing of any one of claims 1 to 4, further comprising a first stop collar connected to the first guide section;

the first limiting ring is arranged along the circumferential direction of the outer wall of the first guide section and is abutted against the side wall, far away from the flow channel, of the valve body.

6. A throttle valve, characterized by comprising a valve body, a valve stem and a guide sleeve according to any one of claims 1 to 5, wherein the guide sleeve is installed in the valve body, and the valve stem is arranged in the guide sleeve in a penetrating way.

7. The choke valve of claim 6, further comprising:

the piston sleeve is connected with the valve body and provided with a piston cavity, the piston cavity is communicated with the valve rod cavity, a liquid inlet hole is formed in the side wall, arranged in the radial direction of the piston sleeve, and the liquid inlet hole is communicated with the piston cavity;

the piston is arranged in the piston cavity in a sliding mode along the axial direction of the piston sleeve, and one end, far away from the flow channel, of the valve rod is connected with the piston; and the number of the first and second groups,

and one end of the elastic piece is abutted against the guide sleeve, and the other end of the elastic piece is abutted against the piston.

8. The throttling valve of claim 7 wherein the piston comprises a piston seat and a piston post;

the piston seat is arranged in the piston cavity in a sliding manner along the axial direction of the piston sleeve;

the piston column is connected with the piston seat and faces one side of the valve rod, and the outer diameter of the piston column is smaller than that of the piston seat; the piston column is provided with a slot along the axial direction of the piston column, the valve rod is inserted in the slot, and the inner diameter of the piston column is larger than the outer diameter of the valve rod;

the side wall of the piston column and the valve rod are provided with through holes, pin shafts are inserted in the through holes, and the valve rod is hinged to the piston column through the pin shafts.

9. The choke valve of claim 8, wherein the pin is a resilient cylindrical pin.

10. The throttling valve of claim 8, wherein the piston seat comprises a third seal groove and a second guide groove;

the third sealing groove is arranged along the circumferential direction of the outer wall of the piston seat and used for mounting a third sealing ring so as to seal a gap between the piston seat and the piston sleeve;

the second guide groove is arranged along the circumferential direction of the outer wall of the piston seat and used for installing a second guide ring so as to limit the radial movement of the piston seat along the piston cavity.

11. The choke valve according to any one of claims 6 to 10, wherein the flow passages comprise first and second angularly disposed flow passages, the stem cavity being disposed coaxially with the second flow passage;

the throttling valve further comprises a valve seat connected in the second flow channel, a seat sleeve is installed in the valve seat, and a seat cavity communicated with the second flow channel is formed in the seat sleeve.

12. The throttling valve of claim 11 wherein an end of the valve stem facing the sleeve is provided with a conical shape and an end of the sleeve facing the valve stem is provided with a conical mouth shape that is adapted to the conical shape.

13. The throttling valve of claim 11, wherein the valve seat comprises a fourth seal groove and a second retaining ring;

the fourth sealing groove is arranged along the circumferential direction of the outer wall of the valve seat and used for mounting a fourth sealing ring so as to seal a gap between the valve seat and the valve body;

the second limiting ring is arranged along the circumferential direction of the outer wall of the valve seat and is abutted against the side wall, facing the valve rod cavity, of the second flow passage; the throttle valve further comprises a gasket, the gasket is arranged between the second limiting ring and the valve body, and the valve seat and the connecting part between the valve bodies are located between the fourth sealing ring and the gasket.

14. A fracturing manifold comprising at least two conduits and a choke according to any one of claims 6 to 13, said choke being connected between two adjacent said conduits, each of said two adjacent conduits being in communication with a flow path of said choke.

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