CN106523726B - A kind of two-phase fluid big flow precise control device - Google Patents

Abstract

The invention discloses a device for accurately controlling the large flow rate of two-phase fluid, which includes a feedback regulating device, a flow regulating device, and a box body; The cavity and the second spring form a 120° circular arc structure embedded in each other, which can shrink along the circumferential direction, and the formed circular inner circle is the throttle port; the flow regulating device drives the large bevel gear to rotate through a pair of conical gears , the large bevel gear converts the rotation into the radial movement of the slider through the rectangular spiral guide rail on its end face, and then the slider drives the arc-shaped assembly on it to shrink in the circumferential direction, thus obtaining a circular orifice with a certain area . If the temperature and pressure of the fluid change, through two feedback adjustment devices, respectively drive the arc-shaped assembly connected to it to move in the radial direction, change the size of the orifice, realize feedback, and obtain the correct flow rate.

Description

A two-phase fluid large flow precision control device

technical field

The invention belongs to the technical field of fluid machinery, and in particular relates to a device for precisely controlling the large flow rate of two-phase fluid containing small particle solids.

Background technique

With the development of industrial technology, flow control valves are often used to precisely control fluid flow in industries such as heating, gas supply, and oil supply. The flow control valve generally changes the area of the orifice under the condition of ensuring the pressure difference to achieve the purpose of controlling the flow. When changing the size of the throttle orifice, its shape changes from circular to other special-shaped shapes, and some have a valve core in the middle of the flow channel. These structures make the fluid flow line discontinuous, the pressure loss is large, and the linearity within the range Poor, if the fluid is a two-phase fluid containing small particles of solids, the wear is severe at the right angle position of the interception port of the control valve and the valve core position, which makes the life of the control valve shorter and the accuracy decreases after wear.

Therefore, for the precise control of the large flow rate of the two-phase fluid containing small particle solids, a device for precisely controlling the large flow rate of the two-phase fluid containing small particle solids is proposed.

Contents of the invention

In order to solve the above problems, the present invention provides a device for precise control of large flow rate of two-phase fluid. It is insensitive to solid impurities and has a long service life.

The present invention is achieved through the following technical solutions:

A two-phase fluid large flow precision control device, including a feedback adjustment device, a flow adjustment device and a box; the flow adjustment device is installed inside the box; the feedback adjustment device is connected to the flow adjustment device through a screw;

The feedback adjustment device includes a driver and a lead screw; the driver is cylindrical; a rectangular groove is opened on the inner wall of the driver; a self-locking spring is installed in the rectangular groove; the lead screw passes through the self-locking Lock the spring and extend out of the driver; the end of the screw extending out of the driver is provided with a thread; the thread is connected with the hexagon nut thread; the hexagon nut is connected with the cavity boss in the flow adjustment device through screws ;

The flow regulating device includes a regulating transmission device and a spool;

The adjusting transmission device includes a handle, a bevel gear, a large bevel gear, a slider and a first spring; the handle is connected with the shaft of the bevel gear through a key; the shaft of the bevel gear is installed inside the box, and the bevel gear Mesh with the large bevel gear; the large bevel gear is placed on the inner bottom of the box; the upper end surface of the large bevel gear is provided with a rectangular spiral guide rail; the rectangular spiral guide rail is matched with the bottom end surface of the slider; the slider A rectangular slot is opened on the upper end surface; a first spring is installed in the rectangular slot;

The valve core includes a telescopic block, a cavity and a second spring; the telescopic block is arc-shaped; the vertical end surface of the telescopic block is provided with several first cylindrical bosses; each of the first cylindrical bosses A second spring is installed; the second spring is placed in the groove opened by the cavity; a raised square block is provided at the lower end of the cavity; a second cylindrical boss is provided on the left and right sides of the square block; The first spring is installed on the second cylindrical boss; the second cylindrical boss is installed in the rectangular groove opened on the slider; the outer wall of the cavity is provided with a cavity boss.

Further, the telescopic block, the cavity and the second spring form a 120° arc structure.

Further, the arc structure formed by the telescopic block, the cavity and the second spring is three groups.

Further, the cavity is provided with a cover plate.

Further, the number of the cylindrical bosses is three.

Further, the box body includes an upper end cover, a lower box body, a second gasket and bolts; the upper end cover and the lower box body are connected by bolts, and a second seal is provided between the upper end cover and the lower box body pad.

Further, the length of the rectangular slot is 1/3 of the length of the actuator; the two ends of the self-locking spring are respectively stuck in the rectangular slot.

Further, the self-locking spring is sealed in the transmission through the transmission end cover.

The invention has a reasonable and compact structure, can compensate for temperature and pressure, can always ensure that the orifice is circular, has small pressure loss, is insensitive to solid impurities in the liquid, and has a long service life.

Description of drawings

Fig. 1 is a partial sectional view of the present invention;

Fig. 2 is the explosion diagram of the feedback regulating device and the flow regulating device of the present invention;

Figure 3 is an exploded view of the structure of the flow regulating device of the present invention;

Fig. 4 is the top view of the present invention;

Fig. 5 is the rotation sectional view of C-C position in Fig. 4;

Figure 6 is a partially enlarged view of Figure 5;

Fig. 7 is a half sectional view of the present invention;

Figure 8 is an enlarged view of the middle drive;

Fig. 9 is an exploded view of the interior of the transmission in Fig. 8 .

The reference signs are as follows:

1-feedback adjustment device, 2-flow adjustment device, 3-box, 101-driver, 102-rectangular slot, 103-self-locking spring, 104-driver end cover, 105-end cover screw, 106-lead screw , 107-thread, 108-hex nut, 109-pin, 110-screw, 201-rectangular spiral guide rail, 202-big bevel gear, 203-first sealing ring, 204-slider, 205-first spring, 206- First spring hole, 207-square block, 208-first cylindrical boss, 209-cavity, 210-cover plate, 211-cover screw, 212-cavity boss, 213-second spring, 214-telescopic Block, 215-second cylindrical boss, 216-key, 217-handle, 218-bevel gear, 219-rectangular groove, 301-bolt, 302-upper end cover, 303-second sealing ring, 304-nut, 305- Fluid inlet, 306-lower box, 307-fluid outlet.

Detailed ways

For further describing the present invention, now describe in conjunction with accompanying drawing:

In conjunction with accompanying drawing 1, a two-phase fluid large-flow precise control device includes three parts: a feedback adjustment device 1, a flow adjustment device 2, and a box body 3. The flow adjustment device 2 is installed inside the box body 3; the feedback adjustment device 1 passes through Lead screw 106 is connected with flow regulating device 2;

6 , 7 and 8 , the feedback adjustment device 1 includes a driver 101 , a self-locking spring 103 , a lead screw 106 , a hex nut 108 , a pin 109 , and a screw 110 . The driver 101 is coaxial with the leading screw 106, the leading screw 106 passes through the driver 101 and the self-locking spring 103, and the driver 101 has a rectangular groove 102; the two ends of the self-locking spring 103 are placed in the rectangular groove 102, and the leading screw There is friction between 106 and self-locking spring 103, but they can still slide relatively; the front end of lead screw 106 has thread 107, and thread 107 cooperates with hex nut 108; Hex nut 108 is connected with cavity boss 212 by screw 110 . There is a pin 109 at the front end of the leading screw 106, and the pin 109 is inside the cavity boss 212 to prevent it from breaking away from the sleeve.

Referring to Figures 2 and 3, 4, 5 and 9, the flow regulating device 2 includes a regulating transmission device and a spool. The adjusting transmission device includes a handle 217 , a key 216 , a bevel gear 218 , a large bevel gear 202 , a sealing ring 203 , a slider 204 and a first spring 205 .

The handle 217 is connected to the shaft of the bevel gear 218 through the key 216; the bevel gear 218 is meshed with the large bevel gear 202; the bottom of the large bevel gear 202 and the lower box 306 is sealed with a sealing ring 203; the large bevel gear 202 passes through a rectangular spiral guide rail 201 is connected with the slider 204; the radian of the slider 204 is 60°, the slider 204 is connected with the first spring 205, the upper surface of the slider 204 is provided with a rectangular groove 219, and the rectangular groove 219 is provided with a first spring hole 206 ; The slider 204 is connected with the cavity 209 through the first spring 205 ;

In conjunction with accompanying drawing 5, the valve core is composed of a telescopic block 214, a cavity 209, a cover plate 210, and a second spring 213 with the same parameters. The combination body, so the valve core is composed of three identical combinations embedded in each other; the telescopic block 214 is arc-shaped, and there are three side-by-side cavity bosses 212 at the end, which are used to install the second spring 213, the cavity body 209 It is a 60° arc, and there is a groove for putting the cover plate 210 on it. The cover plate 210 is connected with the shell of the cavity 209 with screws 211, and there is a raised square block 207 below, and the raised square block 207 is along the direction of the diameter of the cavity. The surfaces respectively have cylindrical bosses 215 for connecting with the first spring 205 . The section of the inlet of the spool is a circle with a variable area, and the cavity 209 is built with a second spring 213 with the same performance parameters.

The box body 3 includes an upper end cover 302 , a lower box body 306 , a second gasket 303 and bolts 301 . The upper end cover 302 and the lower box body 306 are connected by bolts 301, and between the upper end cover 302 and the lower box body 306 is a second gasket 303, which acts between the box body and the upper end cover to prevent fluid leakage. The upper end cover 302 is provided with a fluid inlet 305; the lower part of the box is provided with a fluid outlet 307.

work process:

Set flow rate: when the fluid enters from the inlet 305, it passes through the valve core, and the bevel gear 218 is driven to rotate by shaking the handle 217, and the bevel gear 218 drives the large bevel gear 202 in the box to rotate; since the upper end surface of the large bevel gear 202 has a rectangular The spiral guide rail 201, the cooperation of the slide block 204 and the rectangular spiral guide rail 201 carry out transmission movement, and a rectangular groove 219 is formed in the middle of the upper surface of the slide block 204, and a first spring hole 206 is formed on the side of the rectangular groove 219 along the direction of the center of the circle; when the large cone When the gear 202 rotates, the three sliders 204 are simultaneously driven by the rectangular spiral guide rail 201 to convert the rotational motion into the radial movement of the sliders 204 .

There is a rectangular groove 219 in the middle of the upper surface of the slider 204, and a first spring hole 206 is formed on the side of the rectangular groove 219 along the direction of the center of the circle; a first spring 205 is placed inside the first spring hole 206, and the first spring 205 is connected to the bottom of the valve core. The square blocks 207 are connected. The spool includes a combination of three identical parts, two of which have a feedback adjustment device 1, each connected to the lead screw (106) through a nut 108; the combination includes an arc-shaped cavity 209, a second spring 213, The arc-shaped cover plate 210 and the telescopic block 214 matched with the arc-shaped cavity, the cover plate 210 is sealed by screws 211 . Such a combination of three parts is embedded end to end to form a spool. When the slider 204 matched with the guide rail of the large bevel gear 202 moves radially, the first spring 205 in the slider 204 is deformed; because the force needs to be balanced, so Under the action of the first spring 205, the three spools are respectively driven to move radially; the radial movement of the spools will cause the telescopic block 214 in the cavity to expand and contract in the circumferential direction under the action of the second internal spring 213, so as to embed each other The three identical arc-shaped combinations expand and contract along the circumferential direction, thereby changing the size of the opening area of the spool. According to the set flow rate, the determined orifice area is obtained.

Flow compensation: When the flow of the fluid is adjusted to a set value, if the fluid pressure or temperature changes, the fluid flow needs to be compensated; the pressure sensor or temperature sensor installed at the fluid inlet 305 monitors the pressure and temperature of the fluid, if the pressure and temperature When the temperature changes, the corresponding signal is transmitted to the micro-control processor, and the micro-control processor implements temperature and pressure compensation after calculation. This signal passes through the transmission device to drive the feedback adjustment device 1 to adjust the area of the spool orifice to obtain the compensated The size of the opening area of the spool; the transmission device drives the driver 101, and there is a self-locking spring 103 in the rectangular groove 102 of the driver 101. There is slight friction, and the leading screw 106 passes through the self-locking spring 103 and the driver 101, and is coaxial, and the front end of the leading screw 106 has threads 107 to cooperate with the hex nut 108; Although the rod 106 has friction, it can slide relative to each other, and the leading screw 106 can move back and forth along the spool diameter direction. The driver 101 turns left, acting on one end of the self-locking spring 103, the outer diameter of the self-locking spring 103 shrinks, blocks the lead screw 106, and drives the lead screw 106 to turn left; the driver 101 turns right, acting on the other end of the self-locking spring 103 At one end, the outer diameter of the self-locking spring 103 shrinks, blocks the leading screw 106, and drives the leading screw 106 to turn right.

Leading screw 106 is connected with spool through screw 110, hex nut 108, pin 109. The lead screw 106 rotates, and the rotation of the lead screw 106 is transformed into the radial movement of the nut 108 through the nut 108 . The nut 108 drives a combination of the valve core to move radially through the pin 109, so that the telescopic block 214 in the cavity expands and contracts in the circumferential direction under the action of the second internal spring 213, so that three identical circular arcs embedded in each other The combination expands and contracts along the circumferential direction, and then adjusts the size of the opening area of the spool to realize compensation.

When the flow rate is set, the actuator is adjusted to drive the spool, and the area of the orifice is changed, the actuator 101 does not rotate. There is a gap between the leading screw 106 and the self-locking spring 103, the coefficient of friction is very small, and they can slide relative to each other. At this time, the assembly can drive the hex nut 108 and the lead screw 106 to move radially without being affected by the self-locking spring 103 .

When the flow is compensated, the set flow has been determined, the adjusting transmission is at a fixed position, and the spool is at a certain opening. At this time, the flow is compensated, the transmission 101 rotates, and the self-locking spring 103 locks the lead screw 106 and rotates together with the transmission 101 , through the hex nut 108 to drive the combination to move radially. The combined body is elastically connected to the slider 204 through the first spring 205, and can move relative to the slider 204, so as to change the area of the orifice and realize compensation.

The described embodiment is a preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation, without departing from the essence of the present invention, any obvious improvement, replacement or modification that those skilled in the art can make Modifications all belong to the protection scope of the present invention.

Claims (6)

1. a kind of two-phase fluid big flow precise control device, which is characterized in that including feedback regulation device (1), flow-rate adjustment Device (2) and babinet (3)；It is internal that the flow regulator (2) is mounted on babinet (3)；The feedback regulation device (1) passes through Leading screw (106) is connected with flow regulator (2)；

The flow regulator (2) includes regulate transmission device and spool；

The regulate transmission device includes handle (217), bevel gear (218), bevel gear wheel (202), sliding block (204) and the first bullet Spring (205)；The handle (217) passes through key (216) and bevel gear (218) axis connection；Bevel gear (218) axis is mounted on case On body (3), the bevel gear (218) is meshed with bevel gear wheel (202)；It is internal that the bevel gear wheel (202) is placed in babinet (3) On bottom surface, and it is connected by the first gasket (203)；Rectangular coil is offered on bevel gear wheel (202) upper surface to lead Rail (201)；The rectangular coil guide rail (201) coordinates with sliding block (204) bottom face；It is opened up on sliding block (204) upper surface There is rectangular channel (219)；

The spool includes telescopic block (214), cavity (209) and second spring (213)；The telescopic block (214) is arc-shaped； It is provided with several first cylinder boss (208) in telescopic block (214) the vertical side face；On first cylinder boss (208) It is mounted on second spring (213)；The second spring (213) is placed in the slot that cavity (209) opens up；The cavity (209) Lower end is provided with the square block (207) of protrusion；It is convex it to be provided with the second cylinder in the left and right sides of the square block (207) Platform (215)；Second cylinder boss (215) is mounted in the rectangular channel opened up on sliding block (204)；First spring (205) it is mounted on the second cylinder boss (215) and in the rectangular channel (219)；On cavity (209) lateral wall Equipped with being equipped with cavity boss (212)；

The feedback regulation device (1) includes driver (101) and leading screw (106)；The driver (101) is cylindrical shape；Institute It states and offers rectangular slot (102) on driver (101) inner wall；Self-locking spring is installed in the rectangular slot (102) (103)；The leading screw (106) passes through self-locking spring (103) and extends driver (101)；Extend on the leading screw (106) Driver (101) end offers screw thread (107)；The screw thread (107) is connected with hex nut (108) screw thread；The hexagonal Nut (108) is connected by screw (110) with the cavity boss (212) in flow regulator (2).

2. two-phase fluid big flow precise control device according to claim 1, which is characterized in that the telescopic block (214), cavity (209) and second spring (213) form 120 ° of arc structure.

3. two-phase fluid big flow precise control device according to claim 1, which is characterized in that the cavity (209) On be provided with cover board (210).

4. two-phase fluid big flow precise control device according to any one of claims 1 to 3, which is characterized in that described Babinet (3) includes upper end cover (302), lower box (306), the second gasket (303) and bolt (301)；The upper end cover (302) It is attached by bolt (301) with lower box (306), second is provided between the upper end cover (302) and lower box (306) Gasket (303).

5. two-phase fluid big flow precise control device according to claim 1, which is characterized in that the rectangular slot (102) length is the 1/3 of driver (101) length；The both ends of the self-locking spring (103) are stuck in rectangular slot (102).

6. two-phase fluid big flow precise control device according to claim 1, which is characterized in that the self-locking spring (103) it is sealed in driver (101) by driver end cap (104).