Venturi valve capable of being continuously adjusted

Abstract

The utility model relates to the technical field of venturi valves, and discloses a continuously adjustable venturi valve which comprises a valve body, supporting frames are fixedly connected to the two ends of an inner cavity of the valve body, a driving mechanism is arranged between the two supporting frames and is in transmission connection with a valve element, and the valve element is arranged between the two supporting frames. The driving mechanism comprises a servo motor, an output shaft of the servo motor is in transmission connection with a distance adjusting screw rod, the two ends of the distance adjusting screw rod are rotationally connected to the opposite ends of the two sets of supporting frames, the distance adjusting screw rod is driven by the servo motor to rotate, and then the distance adjusting screw rod adjusts the position of the valve element. Compared with an external driving structure, the precision of adjusting the position of the valve element is improved, the influence of external factors on the position of the valve element can be reduced through driving of the servo motor, the moving error of the valve element is reduced, and therefore the precision of air volume control is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of venturi valves, in particular to a continuously adjustable venturi valve. Background Art

[0002] Venturi valves are widely used in air supply and exhaust ducts to adjust the air volume. Venturi valves mainly control the air volume through the cooperation of a Venturi-shaped shell with an internal valve core and valve stem. Venturi valves are combined with a mechanical pressure-independent regulator to expand airflow control to the highest level. They are widely used in some places that require negative pressure control, such as biological product production plants, toxic and harmful, chemical laboratories, and biosafety laboratories.

[0003] In the prior art, the Chinese utility model with publication number: CN217463358U discloses a high-precision variable air volume Venturi valve, comprising: a valve body shell, a valve core arranged in the valve body shell, an air volume adjustment mechanism, and a moving rod connected to the air volume adjustment mechanism, wherein the valve core is sleeved on the moving rod; the air volume adjustment mechanism comprises: a mounting plate fixed on the valve body shell, a wind valve actuator mounted on the mounting plate, a connecting tooth, a connecting rod connected to the connecting tooth, and a transmission rod rotatably mounted on the mounting plate, wherein one end of the transmission rod passes through the valve body shell and is connected to the moving rod, and the other end is fixedly connected to the connecting rod; the output gear ring of the wind valve actuator is sleeved on the connecting tooth, and the wind valve actuator is used to drive the connecting tooth and the connecting rod to rotate. The utility model controls the rotation process through the wind valve actuator, and the angle of rotation of the wind valve actuator corresponds to the position of the movement of the valve core, thereby controlling the opening degree of the valve core and realizing precise adjustment of the air volume;

[0004] The valve core in the above technical solution is adjusted by driving the connecting rod, and has poor positioning performance and a complex mechanical structure. The quality of the connecting rod is directly related to the adjustment performance of the valve core, and there is a mechanical error of the connecting rod. Therefore, we need to propose a continuously adjustable Venturi valve. Utility Model Content

[0005] The purpose of the utility model is to provide a continuously adjustable Venturi valve, reduce the external driving structure, thereby reducing the influence of external factors on the position of the valve core, while improving the stability of the valve core adjustment, ensuring the accuracy of air volume control, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a continuously adjustable venturi valve, comprising a valve body, both ends of the inner cavity of the valve body are fixedly connected to support frames, a driving mechanism is arranged between two groups of the support frames, and the driving mechanism is transmission-connected to a valve core, and the valve core is arranged between the two groups of support frames;

[0007] The driving mechanism comprises a servo motor, the output shaft of the servo motor is connected to a pitch-adjusting screw, both ends of the pitch-adjusting screw are rotatably connected to opposite ends of two sets of support frames, and the end of the pitch-adjusting screw opposite to the servo motor is fixedly connected to a limit block;

[0008] The valve core includes a valve stem threadedly connected to the outside of the pitch adjusting screw, one end of the valve stem is provided with a screw hole for the pitch adjusting screw to be threadedly connected, the outside of the valve stem is slidably connected with a first cone and a second cone, one end of the first cone is provided with an external threaded pipe, and one end of the second cone is provided with a threaded connection portion for the external threaded pipe to be threadedly connected.

[0009] Preferably, a mounting portion is fixedly connected to the middle portion of the outer side of the valve body, and a control box electrically connected to the servo motor is detachably connected to the upper surface of the mounting portion.

[0010] Preferably, the two groups of support frames each include a mounting plate and three groups of support rods, one end of the three groups of support rods are fixedly connected to the outside of the mounting plate, the three groups of support rods are arranged at equal angles, and the three groups of support rods are fixedly connected to the inner wall of the valve body at one end opposite to the mounting plate.

[0011] Preferably, a through hole is opened on one side of the mounting plate, and a bearing sleeve is embedded in the through hole, and both ends of the pitch-adjusting screw are rotatably connected to the inner ring of the bearing sleeve.

[0012] Preferably, the three groups of support rods of the two groups of support frames are fixedly connected to reinforcing blocks on opposite sides, the support rods and the reinforcing blocks are fixedly connected to telescopic stabilizing rods on opposite sides, and the two relatively arranged telescopic stabilizing rods are fixedly connected to the outer side of the first cone and the outer side of the second cone at opposite ends of the support rods, respectively.

[0013] Preferably, both ends of the outer side of the valve stem are fixedly connected with retaining rings, and a limiting ring is provided at one end of the outer side of the valve stem close to the first cone, and the outer diameter of the limiting ring is larger than the outer diameter of the retaining ring.

[0014] Preferably, a spring is sleeved on the outer side of the valve stem, one end of the spring abuts against one side of the limiting ring, and the other end of the spring abuts against one end of the inner cavity of the second cone.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model mainly achieves the coordination among the valve body, driving mechanism, supporting frame and valve core, and drives the pitch adjusting screw to rotate through the servo motor, so that the pitch adjusting screw adjusts the position of the valve core, thereby improving the accuracy of the valve core position adjustment. Moreover, compared with the external driving structure, the servo motor drive can reduce the influence of external factors on the valve core position and reduce the error of valve core movement, thereby improving the accuracy of air volume control. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the external structure of the valve body of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the valve body of the utility model;

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the valve core of the utility model.

[0020] In the figure: 1. valve body; 2. mounting part; 3. control box; 4. support frame; 41. mounting plate; 42. support rod; 43. reinforcement block; 44. through hole; 45. bearing sleeve; 5. driving mechanism; 51. servo motor; 52. pitch adjusting screw; 53. limit block; 6. telescopic stabilizing rod; 7. valve core; 71. valve stem; 72. retaining ring; 73. screw hole; 74. limit ring; 75. spring; 76. first cone; 77. second cone; 78. external threaded pipe; 79. threaded connection part. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-3 The utility model provides a technical solution: a continuously adjustable venturi valve, comprising a valve body 1, both ends of the inner cavity of the valve body 1 are fixedly connected with support frames 4, a driving mechanism 5 is arranged between two groups of support frames 4, and the driving mechanism 5 is transmission-connected with a valve core 7, and the valve core 7 is arranged between the two groups of support frames 4;

[0023] The driving mechanism 5 includes a servo motor 51, the output shaft of the servo motor 51 is connected to a pitch-adjusting screw 52, ​​both ends of the pitch-adjusting screw 52 are rotatably connected to the opposite ends of the two sets of support frames 4, and the end of the pitch-adjusting screw 52 opposite to the servo motor 51 is fixedly connected to a limit block 53;

[0024] The valve core 7 includes a valve stem 71 threadedly connected to the outside of the pitch adjusting screw 52, ​​and a screw hole 73 for threading the pitch adjusting screw 52 is provided at one end of the valve stem 71. A first cone 76 and a second cone 77 are slidably connected to the outside of the valve stem 71. An external threaded tube 78 is provided at one end of the first cone 76, and a threaded connection portion 79 for threading the external threaded tube 78 is provided at one end of the second cone 77.

[0025] A mounting portion 2 is fixedly connected to the middle portion of the outer side of the valve body 1, and a control box 3 electrically connected to the servo motor 51 is detachably connected to the upper surface of the mounting portion 2. The control box 3 is convenient for receiving external instructions, and then controlling the driving mechanism 5 to perform reciprocating motion, thereby facilitating the control of the air intake of the valve body 1.

[0026] The two groups of support frames 4 each include a mounting plate 41 and three groups of support rods 42. One ends of the three groups of support rods 42 are fixedly connected to the outside of the mounting plate 41. The three groups of support rods 42 are arranged at equal angles. The three groups of support rods 42 are fixedly connected to the inner wall of the valve body 1 at one end opposite to the mounting plate 41. The support rods 42 improve the stability of the mounting plate 41, thereby improving the stability of the driving mechanism 5 during operation and ensuring the accuracy of the position adjustment of the valve core 7.

[0027] A through hole 44 is provided on one side of the mounting plate 41, and a bearing sleeve 45 is embedded in the through hole 44. Both ends of the pitch adjusting screw 52 are rotatably connected to the inner ring of the bearing sleeve 45. The bearing sleeve 45 is conveniently installed through the through hole 44, thereby improving the stability of the pitch adjusting screw 52 during rotation.

[0028] The three groups of support rods 42 of the two groups of support frames 4 are fixedly connected to the opposite sides with reinforcement blocks 43, and the support rods 42 and the reinforcement blocks 43 are fixedly connected to the opposite sides with telescopic stabilizing rods 6. The two relatively arranged groups of telescopic stabilizing rods 6 are fixedly connected to the outer sides of the first cone 76 and the outer sides of the second cone 77 at the opposite ends of the support rods 42, respectively. The overall strength of the support frame 4 is improved by the reinforcement blocks 43, which avoids the position displacement of the driving mechanism 5 due to the long-term use of the Venturi valve, thereby improving the accuracy of air volume control.

[0029] Both ends of the outer side of the valve stem 71 are fixedly connected with a retaining ring 72, and a limiting ring 74 is provided on the outer side of the valve stem 71, close to the first cone 76. The outer diameter of the limiting ring 74 is larger than the outer diameter of the retaining ring 72. The position of the first cone 76 and the second cone is limited by the retaining ring 72, so that the spring 75 is compressed when the first cone 76 and the second cone collide with the valve body 1, thereby buffering the valve core 7 and improving the service life of the valve core 7.

[0030] A spring 75 is sleeved on the outer side of the valve stem 71, one end of the spring 75 abuts against one side of the limit ring 74, and the other end of the spring 75 abuts against one end of the inner cavity of the second cone 77. The spring 75 facilitates the cushioning of the valve core 7 when the second cone abuts against the valve body 1, thereby increasing the service life of the valve core 7.

[0031] When in use, the control box 3 receives remotely sent instructions, and then controls the servo motor 51 to start. The servo motor 51 drives the pitch adjusting screw 52 to rotate, and then the rotational motion of the pitch adjusting screw 52 is converted into the linear motion of the valve core 7, so that the first cone 76 and the second cone 77 on the valve stem 71 are close to the circulation area in the valve body 1, so as to control the valve core 7 to adjust the air circulation area. At the same time, the three sets of telescopic stabilizing rods 6 ensure the stability of the movement of the valve core 7, thereby ensuring the accuracy of the air volume control, and the operation is simple.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A continuously adjustable Venturi valve, comprising a valve body (1), characterized in that: Both ends of the inner cavity of the valve body (1) are fixedly connected to support frames (4), a driving mechanism (5) is arranged between the two groups of support frames (4), and the driving mechanism (5) is drivingly connected to a valve core (7), and the valve core (7) is arranged between the two groups of support frames (4); The driving mechanism (5) comprises a servo motor (51), the output shaft of the servo motor (51) is drivingly connected to a pitch-adjusting screw (52), both ends of the pitch-adjusting screw (52) are rotatably connected to opposite ends of two sets of support frames (4), and the end of the pitch-adjusting screw (52) opposite to the servo motor (51) is fixedly connected to a limit block (53); The valve core (7) comprises a valve stem (71) threadedly connected to the outside of the pitch adjusting screw (52); one end of the valve stem (71) is provided with a screw hole (73) for threading the pitch adjusting screw (52); the outside of the valve stem (71) is slidably connected with a first cone (76) and a second cone (77); one end of the first cone (76) is provided with an external threaded tube (78); one end of the second cone (77) is provided with a threaded connection portion (79) for threading the external threaded tube (78).

2. A continuously adjustable Venturi valve according to claim 1, characterized in that: A mounting portion (2) is fixedly connected to the middle portion of the outer side of the valve body (1), and a control box (3) electrically connected to the servo motor (51) is detachably connected to the upper surface of the mounting portion (2).

3. A continuously adjustable Venturi valve according to claim 2, characterized in that: The two groups of support frames (4) each comprise a mounting plate (41) and three groups of support rods (42); one end of each of the three groups of support rods (42) is fixedly connected to the outside of the mounting plate (41); the three groups of support rods (42) are arranged at equal angles; and one end of the three groups of support rods (42) opposite to the mounting plate (41) is fixedly connected to the inner wall of the valve body (1).

4. A continuously adjustable Venturi valve according to claim 3, characterized in that: A through hole (44) is provided on one side of the mounting plate (41), and a bearing sleeve (45) is embedded in the through hole (44). Both ends of the pitch-adjusting screw rod (52) are rotatably connected to the inner ring of the bearing sleeve (45).

5. A continuously adjustable Venturi valve according to claim 4, characterized in that: The three groups of support rods (42) of the two groups of support frames (4) are fixedly connected to the opposite side with a reinforcement block (43), the support rods (42) and the reinforcement block (43) are fixedly connected to the opposite side with a telescopic stabilizing rod (6), and the opposite ends of the two groups of telescopic stabilizing rods (6) and the support rods (42) are respectively fixedly connected to the outside of the first cone (76) and the outside of the second cone (77).

6. A continuously adjustable Venturi valve according to claim 5, characterized in that: Both ends of the outer side of the valve stem (71) are fixedly connected to retaining rings (72), and a limit ring (74) is provided on the outer side of the valve stem (71) at one end close to the first cone (76), wherein the outer diameter of the limit ring (74) is greater than the outer diameter of the retaining ring (72).

7. A continuously adjustable Venturi valve according to claim 6, characterized in that: A spring (75) is sleeved on the outer side of the valve stem (71), one end of the spring (75) abuts against one side of the limiting ring (74), and the other end of the spring (75) abuts against one end of the inner cavity of the second cone (77).

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