Openness-adjustable throttling orifice plate

Abstract

The invention discloses an opening-adjustable throttling orifice plate, which relates to the technical field of medium throttling, and comprises a plate body, at least one chute arranged in the center of the surface of the plate body in a penetrating manner, at least one shielding hole formed in the side wall of the plate body, a feeding rod arranged in the shielding hole, and a blocking cylinder arranged on the outer wall of the feeding rod in a sleeving manner. The main shaft sealing device has the beneficial effects that the flow and pressure of main shaft sealing can be stabilized by adjusting the opening degree in multiple directions, and river water and water in a water tank are prevented from entering the top cover.

Description

Technical Field

[0001] The invention relates to the technical field of medium throttling, in particular to a throttling orifice plate with adjustable opening. Background Art

[0002] The main shaft seal of a large hydroelectric generator set is crucial to prevent water leakage. Improper adjustment of flow pressure may cause water overflow or influx of river water, affecting equipment and safety. The generator set of a giant hydropower station uses a throttling orifice plate for adjustment, but due to different working conditions, the orifice plate and valve adjustment of the same size cannot meet the needs of all units, resulting in water accumulation on some top covers. Therefore, developing an adjustable throttling orifice plate to adapt to different working conditions is of great significance to ensure the safe operation of the unit. Summary of the invention

[0003] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0004] Therefore, the purpose of the present invention is to provide a throttling orifice plate with adjustable opening, which can solve the problem that the standard orifice plate cannot meet the targeted flow and pressure control needs of each unit, thereby causing water accumulation on the top cover, and also solves the problem of poor sealing effect caused by misalignment with the flange connection during installation.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a throttle orifice plate with adjustable opening, comprising a plate body, at least one inclined groove penetrating and arranged at the center of its surface, at least one shielding hole arranged on the side wall of the plate body, a feed rod arranged in the shielding hole, and a blocking cylinder sleeved on the outer wall of the feed rod;

[0006] The shielding hole comprises a strip groove arranged on the inner wall thereof and a first circular groove arranged in the shielding hole adjacent to the opening; the shielding hole passes through the center of the inclined groove and is on the same axis;

[0007] The feed rod comprises a first circular ring arranged at its end, and a first connecting column arranged at one end of the first circular ring; the feed rod is threadably matched with the stopper cylinder;

[0008] The retaining cylinder comprises a limiting strip arranged on its outer wall; the retaining cylinder is closed on one side.

[0009] As a preferred solution of the throttle orifice plate with adjustable opening described in the present invention, the plate body includes at least one annular groove arranged on the side of the shielding hole, at least two movable grooves arranged on the inner wall of the annular groove, and a movable groove arranged on one side of the movable groove.

[0010] As a preferred solution of the throttle orifice plate with adjustable opening described in the present invention, the centering unit includes a guide ring arranged in the annular groove and a sliding block arranged in the movable groove.

[0011] As a preferred solution of the throttle orifice plate with adjustable opening of the present invention, wherein: the guide ring includes a vortex strip arranged at its end surface, and a first conical tooth surface arranged at the edge line of the guide ring;

[0012] The sliding block comprises a vortex groove arranged on a surface thereof, and a top block arranged on another surface of the sliding block.

[0013] As a preferred solution of the throttle orifice plate with adjustable opening described in the present invention, the plate body further includes a handle arranged at one end of one of the inclined grooves, a receiving groove arranged inside the handle, an extension hole arranged at one end of the receiving groove, a second circular groove arranged adjacent to the opening in the extension hole, a plurality of spring sheets arranged on the inner wall of the receiving groove, at least one locking sleeve arranged on the surface of the handle, and a spring cavity arranged on the inner wall of the locking sleeve.

[0014] As a preferred solution of the throttle orifice plate with adjustable opening described in the present invention, the transmission unit includes a driving rod, an engaging cylinder sleeved on the outer wall of the driving rod, a protective cylinder arranged on one side of the engaging cylinder, a thrust spring arranged on one side of the protective cylinder, and a positioning assembly arranged in the locking sleeve.

[0015] As a preferred solution of the throttle orifice plate with adjustable opening described in the present invention, the driving rod includes a plurality of traction strips arranged on its outer wall, a second ring arranged on the end of the driving rod, and a second connecting column arranged at one end of the second ring.

[0016] As a preferred solution of the throttle orifice plate with adjustable opening described in the present invention, the engagement cylinder includes a reserved cavity arranged at the center of one end thereof, a second conical tooth surface arranged at the end of the engagement cylinder, and a plurality of trapezoidal grooves arranged on the outer wall of the other end of the engagement cylinder.

[0017] As a preferred solution of the throttle orifice plate with adjustable opening described in the present invention, the protective tube includes a plurality of trapezoidal blocks arranged at its end, a positioning groove arranged on the outer wall of the protective tube, and a slope arranged at the other end of the protective tube.

[0018] As a preferred solution of the throttle orifice plate with adjustable opening described in the present invention, the positioning assembly includes a pulling column, a spring seat arranged on the outer wall of the pulling column, and a positioning spring sleeved on the outer wall of the pulling column.

[0019] Beneficial effects of the invention: The invention can stabilize the flow and pressure of the main shaft seal by adjusting the opening in multiple directions, and prevent river water and water tank water from entering the top cover. In addition, the device is easy to install, and can achieve auxiliary positioning and opening adjustment through a single drive rod, and the functional parts will not interfere with each other, the concentricity between the flanges is high, the adjustment is precise, and the main shaft seal can be guaranteed to be safe and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is an overall three-dimensional view of the present invention.

[0022] Figure 2 It is a full cross-sectional view along the axial direction of the feed rod of the present invention.

[0023] Figure 3 It is an overall cross-sectional view along the axial direction of the driving rod of the present invention.

[0024] Figure 4 It is a full cross-sectional view along the axial direction of the driving rod of the present invention.

[0025] Figure 5 It is an overall cross-sectional view along the radial direction of the plate body of the present invention. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Example 1

[0030] Reference Figure 1 , Figure 2and Figure 5 , which is the first embodiment of the present invention, and provides a throttle orifice plate with adjustable opening, comprising a plate body 100, including at least one inclined groove 101 penetrating and arranged at the center of its surface, at least one shielding hole 102 arranged on the side wall of the plate body 100, a feed rod 103 arranged in the shielding hole 102, and a blocking cylinder 104 sleeved on the outer wall of the feed rod 103;

[0031] The shielding hole 102 includes a strip groove 102a disposed on the inner wall thereof and a first circular groove 102b disposed in the shielding hole 102 adjacent to the opening; the shielding hole 102 passes through the center of the inclined groove 101 and is on the same axis;

[0032] The feed rod 103 includes a first circular ring 103a disposed at its end, and a first connecting column 103b disposed at one end of the first circular ring 103a; the feed rod 103 is threadedly matched with the stopper cylinder 104;

[0033] The retaining cylinder 104 includes a limiting strip 104a disposed on its outer wall; the retaining cylinder 104 is closed on one side.

[0034] It should be noted that the plate body 100 is generally circular and flat, and three through chute grooves 101 are provided on the upper surface of the plate body 100. The chute grooves 101 are used for the flow of media in the upper and lower directions, and each chute groove 101 radially diverges from the center of the plate body 100. In this embodiment, three chute grooves 101 are used, and the actual number of chute grooves 101 is determined by the upper limit of the flow rate through the chute grooves 101.

[0035] Preferably, a shielding hole 102 is opened on the side wall of the plate body 100. The shielding hole 102 is cylindrical and distributed along the central axis of the inclined groove 101. The shielding hole 102 is kept at a certain distance from the center of the plate body 100 to prevent the blocking cylinder 104 from being offside from the shielding hole 102. Each inclined groove 101 corresponds to a shielding hole 102.

[0036] Preferably, a first circular groove 102b is further provided inside the shielding hole 102 near the side wall of the plate body 100. The diameter of the first circular groove 102b is slightly larger than the diameter of the shielding hole 102, and is used to cooperate with the first circular ring 103a. The feed rod 103 is inserted into the shielding hole 102. Therefore, under the action of the first circular groove 102b, the feed rod 103 cannot move axially but can rotate circumferentially.

[0037] Preferably, an axially extending strip groove 102a is formed on the inner wall of the shielding hole 102, and the strip groove 102a can cooperate with an axially extending and fixed limiting strip 104a on the outer wall of the retaining cylinder 104, so that the retaining cylinder 104 cannot rotate circumferentially but can move axially.

[0038] Preferably, a retaining cylinder 104 is sleeved on the rod body of the feed rod 103 facing the center of the plate body 100, and the two are threadedly matched, and the outer wall of the retaining cylinder 104 is tightly fitted with the inner wall of the shielding hole 102. Therefore, when the feed rod 103 rotates, the retaining cylinder 104 can be driven to move axially, and during the movement of the retaining cylinder 104, the inclined groove 101 at this position will be axially blocked, so that the flow area of ​​the inclined groove 101 changes, so as to achieve the purpose of adjusting the flow and pressure of the plate body 100.

[0039] Preferably, a prismatic first connecting column 103b is fixed to the end of the feed rod 103 away from the center of the plate body 100, and the first connecting column 103b extends out of the shielding hole 102, so that the operator can rotate the feed rod 103 by tools such as handles and wrenches.

[0040] Preferably, the two side walls of the inclined groove 101 have a certain slope.

[0041] Since there are three inclined slots 101 in this embodiment, there are also three directions in which the opening can be adjusted, and the inclined slots 101 are distributed in a T-shaped divergence. This direction selection can cope with the situation where one side of the plate body 100 is a wall, which is convenient for personnel to adjust. If there is no obstruction around the plate body 100, the direction distribution of the inclined slots 101 can be freely selected.

[0042] In summary, this design has a simple structure, compact design, and strong operability; it is flexible in action, safe and reliable, low in cost, and has good effects; it can accurately adjust the inlet flow and pressure of the turbine main shaft seal, and the flow and pressure fluctuations are small during adjustment; one-time processing and molding can meet the needs of all types of units; most importantly, by accurately adjusting the flow and pressure when the main shaft seal is running, it can prevent river water from pouring into the top cover, and prevent the water in the main shaft seal water tank from flooding into the top cover, ensuring the safe and stable operation of the main shaft seal, thereby ensuring the safe and stable operation of the unit.

[0043] Example 2

[0044] Reference Figure 1 to Figure 5 , which is the second embodiment of the present invention, and is different from the first embodiment in that: the plate body 100 also includes at least one annular groove 105 arranged on the side of the blocking hole 102, at least two movable grooves 106 arranged on the inner wall of the annular groove 105, and a movable groove 107 arranged on one side of the movable groove 106.

[0045] Preferably, the centering unit 200 includes a guide ring 201 disposed in the annular groove 105 and a sliding block 202 disposed inside the movable groove 106 .

[0046] Preferably, the guide ring 201 includes a vortex strip 201a disposed at its end surface, and a first bevel tooth surface 201b disposed at the edge of the guide ring 201;

[0047] The sliding block 202 includes a spiral groove 202 a disposed on a surface thereof, and a top block 202 b disposed on another surface of the sliding block 202 .

[0048] Preferably, the plate body 100 also includes a handle 108 arranged at one end of one of the inclined grooves 101, a receiving groove 109 arranged inside the handle 108, an extension hole 110 arranged at one end of the receiving groove 109, a second circular groove 111 arranged at an opening adjacent to the extension hole 110, a plurality of spring pieces 112 arranged on the inner wall of the receiving groove 109, at least one locking sleeve 113 arranged on the surface of the handle 108, and a spring cavity 114 arranged on the inner wall of the locking sleeve 113.

[0049] Preferably, the transmission unit 300 includes a driving rod 301, an engaging cylinder 302 sleeved on the outer wall of the driving rod 301, a protective cylinder 303 arranged on one side of the engaging cylinder 302, a propulsion spring 304 arranged on one side of the protective cylinder 303, and a positioning assembly 305 arranged in the locking sleeve 113.

[0050] Preferably, the driving rod 301 includes a plurality of traction bars 301a disposed on its outer wall, a second ring 301b disposed at the end of the driving rod 301, and a second connecting column 301c disposed at one end of the second ring 301b; the driving rod 301 is threadedly matched with the blocking cylinder 104.

[0051] Preferably, the engagement cylinder 302 includes a reserved cavity 302 a disposed at the center of one end thereof, a second bevel tooth surface 302 b disposed at the end of the engagement cylinder 302 , and a plurality of trapezoidal grooves 302 c disposed on the outer wall of the other end of the engagement cylinder 302 .

[0052] Preferably, the protection tube 303 includes a plurality of trapezoidal blocks 303 a disposed at the end thereof, a positioning groove 303 b disposed on the outer wall of the protection tube 303 , and a slope 303 c disposed at the other end of the protection tube 303 .

[0053] Preferably, the positioning assembly 305 includes a pulling column 305a, a spring seat 305b disposed on the outer wall of the pulling column 305a, and a positioning spring 305c sleeved on the outer wall of the pulling column 305a.

[0054] It should be noted that an annular groove 105 is provided inside the plate body 100 on the upper and lower sides or one side of the shielding hole 102. In this embodiment, the two annular grooves 105 are symmetrically distributed on the upper and lower sides of the shielding hole 102 and are concentric with the plate body 100. The two annular grooves 105 are not directly connected to any shielding hole 102.

[0055] Preferably, three moving grooves 106 are further provided on the inner wall of the annular groove 105 away from the shielding hole 102, and the moving grooves 106 are distributed circumferentially on the annular groove 105. The actual moving grooves 106 may be provided in two symmetrical numbers, or in other numbers and distribution forms greater than two.

[0056] Preferably, a movable groove 107 communicating with the outside is further provided on the inner wall of the movable groove 106 away from the shielding hole 102 .

[0057] Preferably, a guide ring 201 is also installed inside the annular groove 105, and the inner and outer diameters and height of the guide ring 201 are consistent with the inner and outer diameters of the annular groove 105. A spiral strip 201a distributed in a spiral shape is fixed on the end surface of the guide ring 201 away from the shielding hole 102. The specifications of the two guide rings 201 in this embodiment include that the distribution direction of the spiral strip 201a is consistent, so they are distributed symmetrically around the center. A first conical tooth surface 201b is also provided at the outer edge of the annular groove 105, and the first conical tooth surfaces 201b on the two guide rings 201 are distributed oppositely.

[0058] Preferably, a sliding block 202 is installed inside each moving groove 106. The sliding block 202 is shorter than the moving groove 106, but has the same width and height as the moving groove 106, so the sliding block 202 can move linearly along the moving groove 106. In addition, a vortex groove 202a is provided on the surface of the sliding block 202 facing the shielding hole 102. The groove shape of the vortex grooves 202a on the three sliding blocks 202 is consistent with the vortex strip 201a, so the sliding block 202 can be closely matched with the guide ring 201. When the guide ring 201 rotates, the vortex strip 201a can drive each sliding block 202 to move radially synchronously. Since the two guide rings 201 are symmetrical in center, when the two guide rings 201 rotate in opposite directions, the moving directions of the sliding blocks 202 on the two surfaces can remain consistent.

[0059] Preferably, a top block 202b is fixed on the surface of the sliding block 202 away from the shielding hole 102, and the top block 202b can extend out of the movable groove 107. The sliding block 202 is longer than the movable groove 107, so the sliding block 202 can always block the movable groove 107 during the movement process to ensure the sealing effect.

[0060] It should be noted that when the plate 100 is installed between two flanges, if the two guide rings 201 rotate at the same time, each top block 202b can move radially synchronously until it contacts the inner wall of the flange. At this time, the plate 100 and the flange remain concentric, which can avoid manual repeated position adjustment and align the flange mouth in one go. Due to the setting of the vortex strip 201a, the top block 202b cannot reversely drive the guide ring 201, ensuring that the plate 100 will not malfunction or deviate during installation.

[0061] Preferably, a handle 108 is fixed on the side wall of the plate body 100 at the axial position of one of the inclined grooves 101, and the handle 108 can facilitate the personnel to hold and adjust the plate body 100. At the center of the handle 108, an axial receiving groove 109 is opened, and the receiving groove 109 is connected to the shielding hole 102 in the inclined groove 101. In addition, the receiving groove 109 is also connected to two annular grooves 105, so that the first bevel tooth surface 201b on the guide ring 201 is exposed inside the receiving groove 109.

[0062] Preferably, at the other end of the receiving groove 109, an axial and through extension hole 110 is provided inside the handle 108, and the shielding hole 102, the receiving groove 109, and the extension hole 110 are concentric and sequentially connected. A second circular groove 111 is also provided on the inner wall of the end of the extension hole 110 away from the center of the plate body 100, and the driving rod 301 can be inserted into the extension hole 110 and extend into the shielding hole 102 at this position, and the second circular ring 301b at the end away from the plate body 100 cooperates with the second circular groove 111, so that the driving rod 301 can only rotate circumferentially but not move circumferentially. A second connecting column 301c is also fixed on the side of the second circular ring 301b, and the shape and function of the second connecting column 301c are consistent with those of the first connecting column 103b. In addition, the rod body at the other end of the driving rod 301 can be threadedly matched with the blocking cylinder 104. When the driving rod 301 rotates, it can also drive the blocking cylinder 104 to move axially, so as to adjust the opening of the inclined slot 101 at that location.

[0063] Preferably, the engagement tube 302 , the protection tube 303 and the propulsion spring 304 all move inside the accommodating groove 109 .

[0064] Preferably, an engagement cylinder 302 is sleeved on the shaft of the driving rod 301, and a columnar reserved cavity 302a is provided at the end of the engagement cylinder 302 facing the shielding hole 102. The reserved cavity 302a is open on one side to provide space for the axial movement of the blocking cylinder 104. A second bevel tooth surface 302b is provided on the outer edge line of the engagement cylinder 302 facing the shielding hole 102. The second bevel tooth surface 302b can be engaged with the two first bevel tooth surfaces 201b at the same time. When the engagement cylinder 302 rotates, the two guide rings 201 can be driven to rotate at the same time. A plurality of trapezoidal grooves 302c distributed circumferentially are provided on the outer wall of the other end of the engagement cylinder 302. In this embodiment, four circumferential arrays of trapezoidal grooves 302c are used.

[0065] Preferably, the protective cylinder 303 is also sleeved on the rod body of the driving rod 301. A trapezoidal block 303a having the same shape and number as the trapezoidal groove 302c is fixed on the end face of the engaging cylinder 302 facing the center of the plate body 100, so that the trapezoidal block 303a can be inserted into the trapezoidal groove 302c. Positioning grooves 303b distributed in a circumference and passing through both sides are opened on the inner wall of the protective cylinder 303. In this embodiment, four positioning grooves 303b are used. The positioning grooves 303b are strip-shaped. On the outer wall of the driving rod 301, between the second ring 301b and the thread, a traction bar 301a having the same shape and number as the positioning groove 303b is fixed. The traction bar 301a cooperates with the traction bar 301b, so that the protective cylinder 303 can only move axially in the driving rod 301 and can only be driven to rotate by the driving rod 301. It should be noted that the traction bar 301a only extends to the stroke of the protective cylinder 303.

[0066] Preferably, a push spring 304 is further provided at one end of the protective tube 303 away from the center of the plate body 100, and the push spring 304 is also sleeved on the outer wall of the driving rod 301. Therefore, under the action of the push spring 304, the protective tube 303 can always push against the meshing tube 302, and when the driving rod 301 rotates, the protective tube 303 is driven to rotate, and due to the cooperation between the trapezoidal block 303a and the trapezoidal groove 302c, the meshing tube 302 can be driven to rotate, and the second bevel tooth surface 302b is meshed with the two first bevel tooth surfaces 201b, so that the two guide rings 201 rotate at the same speed and in opposite directions.

[0067] Preferably, a locking sleeve 113 is fixed on the outer surface of the handle 108, and the cavity inside the locking sleeve 113 is connected to the outside and the receiving groove 109. In this embodiment, two locking sleeves 113 are used, which are symmetrically distributed on the upper and lower surfaces of the handle 108. In the actual selection process, the locking sleeves 113 can be distributed circumferentially along the receiving groove 109 and the number is arbitrary.

[0068] A spring cavity 114 is also provided on the inner wall of the locking sleeve 113, and the inner diameter of the spring cavity 114 is slightly larger than that of the locking sleeve 113. The positioning assembly 305 is located inside the locking sleeve 113. Specifically, the pulling column 305a is sleeved inside the locking sleeve 113 and one end thereof extends into the receiving groove 109, and the end of the end is rounded. A spring seat 305b is also fixed to the column body of the pulling column 305a, and the outer diameter of the spring seat 305b is consistent with the inner diameter of the spring cavity 114. In addition, there is a positioning spring 305c between the spring seat 305b and the bottom of the spring cavity 114 away from the receiving groove 109, which is sleeved on the column body of the pulling column 305a and can pull the column 305a into the receiving groove 109. The other end of the pulling column 305a extends out of the locking sleeve 113, and a protrusion for lifting is fixed to the end.

[0069] Preferably, when the protective tube 303 is close to the engagement tube 302, the pulling column 305a is located on the side of the protective tube 303 provided with the inclined surface 303c. A positioning groove 303b is also provided on the outer wall of the protective tube 303, and the groove width and groove depth of the positioning groove 303b are sufficient to be inserted by the pulling column 305a, and an inclined surface 303c is also provided on the outer edge line of the protective tube 303 away from the center of the plate body 100.

[0070] It should be noted that when the two guide rings 201 rotate and drive the sliding blocks 202 to move radially, the top block 202b will press against the inner wall of the corresponding side flange until it is stuck. The guide ring 201 cannot rotate further at this time. The engaging cylinder 302 is stuck at this time. If the driving rod 301 rotates further at this time, under the action of the trapezoidal groove 302c and the side wall of the trapezoidal block 303a, the protective cylinder 303 will rotate with the driving rod 301, overcome the force of the propulsion spring 304 and move along the direction of the traction bar 301a until it completely exits the engaging cylinder 302. At this time, the transmission between the protective cylinder 303 and the engaging cylinder 302 is completely disconnected. When the transmission is disconnected, the pulling column 305a is inserted into the interior of the positioning groove 303b, so that the protective cylinder 303 cannot be reset and is inserted into the engaging cylinder 302 again. At this time, the driving rod 301 will not be interfered by the jamming of the engaging cylinder 302, so the driving rod 301 can adjust the blocking cylinder 104 normally and freely.

[0071] Preferably, a plurality of spring pieces 112 distributed in a circle are fixed to the inner wall of the accommodating groove 109, the spring pieces 112 are in the shape of narrow strips, the positions of the spring pieces 112 correspond to the positions of the trapezoidal grooves 302c, and the number of the spring pieces 112 is much larger than the number of the trapezoidal grooves 302c. Therefore, when the protective tube 303 is limited by the pulling column 305a, the spring pieces 112 with movable margin will extend into the trapezoidal groove 302c and resist the groove wall of the trapezoidal groove 302c. Therefore, even if the driving rod 301 is rotated arbitrarily in time, the engaging tube 302 will not malfunction, thereby causing the top block 202b to move in the opposite direction, making the supporting and clamping effect invalid.

[0072] Preferably, each spring piece 112 faces the direction of the plate body 100 , and when the spring piece 112 is squeezed, it can be embedded in the groove wall of the accommodating groove 109 .

[0073] When the top block 202b needs to be away from the inner wall of the flange, the pulling column 305a inserted into the positioning groove 303b needs to be pulled out, so that the protective tube 303 is pressed toward the engaging tube 302 by the pushing spring 304, and the protective tube 303 and the engaging tube 302 can cooperate with each other. At the same time, the protective tube 303 will press the spring 112 into the groove wall of the accommodating groove 109. At this point, the rotation of the driving rod 301 can drive the guide ring 201 to rotate in the opposite direction, so that each top block 202b is away from the inner wall of the flange.

[0074] In summary, this design can accurately position the throttling orifice during installation, without the need for personnel to repeatedly adjust the position of the throttling orifice, while ensuring the centering and supporting effects, automatically switching the transmission mode without affecting the opening adjustment function of the throttling orifice. The device has a compact structure and can assist personnel in simplifying the installation work.

[0075] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A throttle orifice plate with adjustable opening, characterized in that: include, A plate body (100) comprises at least one inclined groove (101) penetrating and arranged at the center of its surface, at least one shielding hole (102) arranged on the side wall of the plate body (100), a feeding rod (103) arranged in the shielding hole (102), and a blocking cylinder (104) sleeved on the outer wall of the feeding rod (103); The shielding hole (102) comprises a strip groove (102a) arranged on the inner wall thereof, and a first circular groove (102b) arranged in the shielding hole (102) adjacent to the opening; the shielding hole (102) passes through the center of the inclined groove (101) and is on the same axis; The feed rod (103) comprises a first circular ring (103a) arranged at its end, and a first connecting column (103b) arranged at one end of the first circular ring (103a); the feed rod (103) is threadedly matched with the stopper cylinder (104); The retaining cylinder (104) comprises a limiting strip (104a) arranged on its outer wall; the retaining cylinder (104) is closed on one side.

2. The throttle orifice plate with adjustable opening as claimed in claim 1, characterized in that: The plate body (100) comprises at least one annular groove (105) arranged on the side of the shielding hole (102), at least two movable grooves (106) arranged on the inner wall of the annular groove (105), and a movable groove (107) arranged on one side of the movable groove (106).

3. The throttle orifice plate with adjustable opening as claimed in claim 2, characterized in that: Also includes, The centering unit (200) comprises a guide ring (201) arranged in the annular groove (105), and a sliding block (202) arranged inside the movable groove (106).

4. The throttle orifice plate with adjustable opening as claimed in claim 3, characterized in that: The guide ring (201) comprises a vortex strip (201a) arranged at the end surface thereof, and a first bevel tooth surface (201b) arranged at the edge line of the guide ring (201); The sliding block (202) comprises a vortex groove (202a) arranged on a surface thereof, and a top block (202b) arranged on another surface of the sliding block (202).

5. The throttle orifice plate with adjustable opening as claimed in claim 4, characterized in that: The plate body (100) further comprises a handle (108) arranged at one end of one of the inclined grooves (101), a receiving groove (109) arranged inside the handle (108), an extension hole (110) arranged at one end of the receiving groove (109), a second circular groove (111) arranged in the extension hole (110) adjacent to the opening, a plurality of spring pieces (112) arranged on the inner wall of the receiving groove (109), at least one locking sleeve (113) arranged on the surface of the handle (108), and a spring cavity (114) arranged on the inner wall of the locking sleeve (113).

6. The throttle orifice plate with adjustable opening as claimed in claim 5, characterized in that: Also includes, The transmission unit (300) comprises a driving rod (301), an engaging cylinder (302) sleeved on the outer wall of the driving rod (301), a protective cylinder (303) arranged on one side of the engaging cylinder (302), a propulsion spring (304) arranged on one side of the protective cylinder (303), and a positioning assembly (305) arranged in the locking sleeve (113).

7. The throttle orifice plate with adjustable opening as claimed in claim 6, characterized in that: The driving rod (301) comprises a plurality of traction bars (301a) arranged on its outer wall, a second circular ring (301b) arranged at the end of the driving rod (301), and a second connecting column (301c) arranged at one end of the second circular ring (301b); the driving rod (301) and the blocking cylinder (104) are threadedly matched.

8. The throttle orifice plate with adjustable opening as claimed in claim 7, characterized in that: The engagement cylinder (302) comprises a reserved cavity (302a) arranged at the center of one end thereof, a second bevel tooth surface (302b) arranged at the end of the engagement cylinder (302), and a plurality of trapezoidal grooves (302c) arranged on the outer wall of the other end of the engagement cylinder (302).

9. The throttle orifice plate with adjustable opening as claimed in claim 8, characterized in that: The protective tube (303) comprises a plurality of trapezoidal blocks (303a) arranged at its end, a positioning groove (303b) arranged on the outer wall of the protective tube (303), and a slope (303c) arranged at the other end of the protective tube (303).

10. The throttle orifice plate with adjustable opening as claimed in claim 9, characterized in that: The positioning assembly (305) comprises a pulling column (305a), a spring seat (305b) arranged on the outer wall of the pulling column (305a), and a positioning spring (305c) sleeved on the outer wall of the pulling column (305a).

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