CN113280138A

CN113280138A - Throttle valve and electric throttle valve

Info

Publication number: CN113280138A
Application number: CN202110780805.2A
Authority: CN
Inventors: 邓仁卿; 曾海军; 郭李梅
Original assignee: Dongguan Maiwo Technology Development Co Ltd
Current assignee: Dongguan Maiwo Technology Development Co Ltd
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2021-08-20

Abstract

The invention belongs to the technical field of throttle valves, and particularly relates to a throttle valve and an electric throttle valve, which comprise a valve seat, an adjusting valve core and an upper cover, wherein a water inlet cavity and a water outlet cavity are arranged in the valve seat, the upper end of the water inlet cavity is connected with the water outlet cavity, the lower end of the water inlet cavity is connected with a water inlet, the lower end of the water outlet cavity is connected with a water outlet, a valve seat internal thread is arranged on the inner wall of the water outlet cavity, the upper cover is arranged at the upper end of the valve seat, the adjusting valve core is arranged in an inner cavity formed by the valve seat and the upper cover, a valve core external thread matched with the valve seat internal thread is arranged at the lower section of the adjusting valve core, a spiral throttling channel is formed by a gap between the valve seat internal thread and the valve core external thread, and the section of the spiral throttling channel is gradually reduced from top to bottom. On the premise of the same adjusting precision and the same throttle valve volume, the method effectively improves the KV value; on the premise of the same KV value and the same throttle valve volume, the adjusting precision is effectively improved.

Description

Throttle valve and electric throttle valve

Technical Field

The invention belongs to the technical field of throttle valves, and particularly relates to a throttle valve and an electric throttle valve.

Background

The KV value and the adjusting precision of the throttle valve have an objective rule in inverse proportion, namely the larger the KV value is, the lower the adjusting precision is. The existing throttle valve is generally designed aiming at a specific application scene, and when the liquid inlet pressure is greatly changed (for example, when water is supplied to a quick heating module connected with municipal tap water or a water purifier, because the tap water pressures at different installation positions and the water pressures of water purification water supply ports at different distances from the water purifier have uncontrollable differences), the existing throttle valve is difficult to meet the requirements if the output liquid flow is stably and linearly controlled in a large range (several times of a KV value), for example, patent CN 104455571 discloses an adjustable throttle valve, wherein a throttling adjusting needle reciprocates in a throttling hole, is limited by the stroke of the throttling adjusting needle and a spring can move through the change of the water pressure, and the KV value in the patent is determined to be small, and the existing throttle valve is difficult to normally operate under low water pressure (such as <0.2 MPA); patent CN 107990011 discloses a throttle valve, which improves the control precision at the beginning of adjustment to a certain extent by arranging a movable block and a return spring at the bottom, but is limited by the size of the conical body at the head of the valve core, the change of the opening degree caused by unit stroke is still large, and the adjustment of the precision range of [ KV value/50 ] is difficult; patent CN 110375100 discloses a throttle valve, which uses the cooperation of a width adjustable ratio equal percentage flow characteristic valve head, a labyrinth type sleeve and a sleeve seat to accurately adjust the flow, but also has the problem of being used only under high pressure difference, and the labyrinth type sleeve has small gap, has a blocking risk when the water quality is poor, and is high in cost and not beneficial to large-scale use.

Disclosure of Invention

In order to solve the technical problem, the invention provides a throttle valve and an electric throttle valve.

The invention is realized in such a way that the throttling valve comprises a valve seat, an adjusting valve core and an upper cover, wherein a water inlet cavity and a water outlet cavity are arranged in the valve seat, the upper end of the water inlet cavity is connected with the water outlet cavity, the lower end of the water inlet cavity is connected with a water inlet, the lower end of the water outlet cavity is connected with a water outlet, valve seat internal threads are arranged on the inner wall of the water outlet cavity, the upper cover is arranged at the upper end of the valve seat, the adjusting valve core is arranged in an inner cavity formed by the valve seat and the upper cover, valve core external threads matched with the valve seat internal threads are arranged on the lower section of the adjusting valve core, a spiral throttling channel is formed by a gap between the valve seat internal threads and the valve core external threads, and the section of the spiral throttling channel is gradually reduced from top to bottom.

Preferably, a plurality of anti-blocking holes are distributed on the valve core external thread, the anti-blocking holes are distributed on the outer teeth of the valve core external thread, the aperture of each anti-blocking hole is smaller than the thread pitch of the valve core external thread, and the number of the anti-blocking holes on each circle of external thread is 0-4.

Further preferably, the number of thread turns of the valve seat internal thread and the valve core external thread is greater than 2, and the thread taper is one angle or a combination of angles in the range of 0-6 degrees.

Further preferably, a valve seat groove is formed in the bottom wall of the valve seat water outlet cavity and the outer side of the upper end of the water outlet;

a second valve seat sealing ring is arranged at the upper end of the valve seat and at the position contacted with the upper cover;

and a plurality of upper cover sealing ring grooves are formed in the upper section of the adjusting valve core, and upper cover sealing rings are arranged in the upper cover sealing ring grooves.

Preferably, the upper end surface of the upper cover is provided with a through hole, the diameter of the through hole is matched with the outer diameter of the upper end of the adjusting valve core, the diameter of the through hole is smaller than the maximum outer diameter of the adjusting valve core, and when the adjusting valve core rotates to a state that the adjusting valve core is limited by the through hole and cannot rise, at least one circle of thread on the outer thread of the valve core is matched with the inner thread of the valve seat.

Preferably, the valve seat and the adjusting valve core are made of plastic materials or metal materials, and when the valve seat and the adjusting valve core are made of plastic materials, the valve seat and the adjusting valve core are made of different materials.

The invention also provides an electric throttle valve which comprises the throttle valve, the speed reducing motor and the motor shaft, wherein the inner wall of the upper section of the regulating valve core is provided with a special-shaped valve core groove, the motor shaft is inserted into the valve core groove, and the upper end of the motor shaft is connected with the speed reducing motor.

Preferably, the automatic control valve further comprises a valve core moving bin, a top cover and a position sensor, wherein the valve core moving bin is fixedly connected with the upper cover, the top cover is installed on the upper surface of the valve core moving bin, the position sensor is arranged in the valve core moving bin and close to the upper end of the motor shaft, and the speed reducing motor is arranged on the top cover.

Preferably, the motor shaft is a D-shaped shaft or an H-shaped shaft, and the length of the motor shaft is greater than or equal to the axial length of the external thread of the valve core.

Further preferably, the position sensors are one of photoelectric switches, micro switches or jog switches, and the number of the position sensors is 1-2.

Compared with the prior art, the invention has the advantages that:

1. on the premise of the same adjusting precision and the same throttle valve volume, the KV value is effectively improved;

2. on the premise of the same KV value and the same throttle valve volume, the adjusting precision is effectively improved;

3. the problem that the throttle valve is easy to block when the KV value is low (<2L/min) is solved;

4. the structural complexity and the cost of the throttle valve are obviously reduced, and the throttle valve is easy to be applied in a large scale;

5. and under the condition that the position of the motor is fixed, the circular motion and the linear motion of the regulating valve core are realized simultaneously.

Drawings

FIG. 1 is a sectional view showing the overall structure of a throttle valve according to embodiment 1;

fig. 2 is a perspective view of a valve seat of a throttle valve provided in embodiment 1;

FIG. 3 is a sectional view of a valve seat of a throttle valve provided in embodiment 1;

fig. 4 is a perspective view of a control valve body of the throttle valve according to embodiment 1;

fig. 5 is a sectional view showing the entire structure of the electric throttle valve provided in embodiment 2.

Fig. 6 is a three-dimensional structural view of a connection structure of an upper cover and a valve element movement chamber of a throttle valve provided in embodiment 2;

fig. 7 is a sectional structure view of a connecting structure of an upper cover and a spool movement chamber of a throttle valve provided in embodiment 2.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Examples 1,

Referring to fig. 1, fig. 2, fig. 3, fig. 4, this embodiment provides a throttle valve, including disk seat 1, adjusting valve core 5 and upper cover 4, disk seat 1 is inside to be equipped with the intake antrum and goes out the water cavity, the upper end and the play water cavity of intake antrum are connected, intake antrum lower extreme connection water inlet 12, it connects delivery port 11 to go out the water cavity lower extreme, it is equipped with disk seat internal thread 2 on the intracavity wall to go out, upper cover 4 is installed in disk seat 1 upper end, adjusting valve core 5 sets up in the inner chamber that disk seat 1 and upper cover 4 formed, the hypomere of adjusting valve core 5 is equipped with the case external screw thread 9 that matches with disk seat internal thread 2, the clearance between disk seat internal thread 2 and the case external screw thread 9 forms spiral throttle passageway 3, the cross-section of spiral throttle passageway 3 reduces from last to down gradually.

The number of thread turns of the valve seat internal thread 2 and the valve core external thread 9 is larger than 2, and the thread taper is one angle or the combination of several angles in 0-6 degrees.

A plurality of anti-blocking holes 53 are distributed on the valve core external thread 9. The anti-blocking holes 53 are distributed on the outer teeth of the valve core external thread 9, the aperture is smaller than the thread pitch of the valve core external thread 9, and the number of the anti-blocking holes 53 on each circle of external thread is 0-4.

The thread forms of the valve seat internal thread 2 and the valve core external thread 9 are both one of a triangle, a trapezoid, a rectangle and an arc, in the embodiment, the valve seat internal thread 2 is a trapezoid thread, the thread diameter is 6.1mm, the number of turns is 10, the pitch is 2.5mm, the initial 1.5 turns of the thread diameter is 10mm, the taper is 0 degree, and the taper of the later thread is 3 degrees; the valve core external thread 9 is a trapezoidal thread, the thread has a small diameter of 6mm, the number of turns is 10, the pitch is 2.5mm, the thread taper is 0 degree, the major diameter is 8mm, and the difference between the small diameter of the valve seat internal thread 2 and the small diameter of the valve core external thread 9 is not more than 0.5 mm; in this embodiment, every circle equipartition has two circular anti-blocking hole 53 of diameter 2mm, hole depth 3mm on the case external screw thread 9.

In the working process, water flow enters the water inlet cavity from the water inlet 12, enters the uppermost end of the spiral throttling channel 3 from the upper end of the water inlet cavity, descends along the spiral throttling channel 3, and finally enters the water outlet 11 from the lower end of the spiral throttling channel 3. When the flow needs to be increased, the adjusting valve core 5 is rotated, the adjusting valve core 5 moves upwards, and the maximum opening degree of the spiral throttling channel 3 is gradually increased, so that the water quantity is increased.

When the water inlet pressure is 0.1MPa and the section area of the spiral throttling channel 3 is maximized by rotating the adjusting valve core 5, the water passing amount is 1800ml/min, the effective adjustable stroke of the embodiment is more than three times of that of a needle valve with the same radial length, and the flow change of the unit stroke is smaller, so the adjusting precision can be effectively improved;

when foreign matters enter the throttle valve in water flow, the foreign matters are preferentially pushed into the anti-blocking holes 53 arranged on the regulating valve core 5, and then the foreign matters can be taken out of the throttle channel in the reciprocating rotation process of the regulating valve core 5, so that the blocking of the foreign matters is effectively avoided;

when water flows in the throttling channel, each half circle of water passes through one circular anti-blocking hole 53, and the water flow can realize the processes of speed reduction and pressure reduction due to the increase of the flow area, so that the throttling 'squeaking' and cavitation phenomena are reduced, and the service life of a structural part is effectively prolonged.

In order to realize sealing at each position, as an improvement, a valve seat groove 10 is arranged on the bottom wall of the water outlet cavity of the valve seat 1 and the outer side of the upper end of the water outlet 11, and a first valve seat sealing ring is arranged in the valve seat groove 10; in this embodiment, disk seat recess 10 external diameter 6mm, internal diameter 4mm, first disk seat sealing washer is useless when normal use, when this choke valve has the function demand of cutting off the water supply, can place first disk seat sealing washer in disk seat recess 10, when adjusting 5 rotatory downshifts to disk seat internal thread 2's bottom, can compress tightly first disk seat sealing washer promptly, cuts off the water source, realizes the function of cutting off the water supply.

A second valve seat sealing ring 8 is arranged at the upper end of the valve seat 1 and at the position contacted with the upper cover 4;

the upper section of the regulating valve core 5 is provided with a plurality of upper cover sealing ring grooves 52, and 2-3 upper cover sealing rings 7 are arranged in the upper cover sealing ring grooves 52. In the present embodiment, the number of the upper cap seals 7 is 2. The upper cover sealing parts 7 play a role in sealing, and the friction force generated by the large contact area between the upper cover sealing parts 7 and the upper cover 4 can effectively provide the stability of the position of the adjusting valve core 5 relative to the valve seat 1, so that the flow adjusting precision is improved, and the manufacturing cost is reduced.

In order to prevent the adjusting valve core 5 from moving out of the upper cover 4, a through hole is formed on the upper end surface of the upper cover 4, the diameter of the through hole is matched with the outer diameter of the upper end of the adjusting valve core 5, and the diameter of the through hole is smaller than the maximum outer diameter of the adjusting valve core 5. I.e. the limiting step 6 is provided. When the adjusting valve core 5 rotates to a state that the adjusting valve core is limited by the through hole and cannot rise, at least one circle of thread of the valve core external thread 9 is matched in the valve seat internal thread 2.

Preferably, the valve seat 1 and the adjusting valve element 5 are made of plastic materials or metal materials, and when the valve seat 1 and the adjusting valve element 5 are made of plastic materials, the valve seat 1 and the adjusting valve element 5 are made of different materials.

In this embodiment, the valve seat 1, the adjusting valve element 5, and the upper cover 4 are made of plastic material, specifically, one or more of nylon, nylon and fiber, polycarbonate, polyformaldehyde, polypropylene, and metal, and in this embodiment, the valve seat 1 is made of nylon, the adjusting valve element 5 is made of polycarbonate, and the upper cover 4 is made of polyformaldehyde.

Examples 2,

Referring to fig. 1, 2, 3, 4, 5, 6 and 7, the present embodiment provides an electric throttle valve, including the throttle valve described in embodiment 1, a speed reduction motor 13 and a motor shaft 16, wherein a profiled spool groove 51 is formed in an inner wall of an upper section of the regulating spool 5, the motor shaft 16 is inserted into the spool groove 51, and an upper end of the motor shaft 16 is connected to the speed reduction motor 13.

The automatic control valve further comprises a valve core movement bin 15, a top cover 17 and a position sensor 14, wherein the valve core movement bin 15 is fixedly connected with the upper cover 4, the top cover 17 is installed on the upper surface of the valve core movement bin 15, the position sensor 14 is arranged in the valve core movement bin 15 and close to the upper end of the motor shaft 16, and the speed reducing motor 13 is arranged on the top cover 17. In the present embodiment, the upper cover 4 is provided integrally with the spool movement bin 15.

The motor shaft 16 is a D-shaped shaft or an H-shaped shaft, and the length of the shaft is more than or equal to the axial length of the valve core external thread 9.

The position sensors 14 are one of photoelectric switches, micro switches or inching switches, and the number of the position sensors is 1-2. As can be seen in fig. 7, a photoelectric switch fixing groove 41 and a click switch and microswitch fixing groove 42 are provided in the spool movement chamber 15.

In the present embodiment, motor shaft 16 is a single flat shaft (D-shaped shaft), 30mm in length, 5mm in shaft outer diameter, and 4mm in flat position; the valve core groove 51 of the motor shaft 16 fixed by the adjusting valve core 5 is also a D-shaped groove correspondingly, the depth is 35mm, the outer diameter of the groove is 5.1mm, and the flat position is 4.1 mm; the position sensor 14 is a microswitch, when the adjusting valve core 5 moves to the maximum cross section area of the throttling channel, the microswitch is triggered to be conducted, and at the moment, the distance between the top of the adjusting valve core 5 and the top of the valve core moving bin 15 is more than 2 mm; the motor shaft 16 is fixed by a screw through the top cover 17 and the speed reducing motor 13, and the motor 13 is locked on the valve core moving bin 15 by a screw.

When the water inlet pressure is 0.1MPa and the position sensor 14 is conducted by rotating the adjusting valve core 5, the water passing amount is 1800ml/min, the effective adjustable stroke of the embodiment is more than three times of that of the needle valve with the same radial length, and the flow change of the unit stroke is smaller, so the adjusting precision can be effectively improved;

when foreign matters enter the throttle valve in water flow, the foreign matters are preferentially pushed into the circular anti-blocking holes 53 arranged on the regulating valve core 5, and then the foreign matters can be taken out of the throttling channel in the reciprocating rotation process of the regulating valve core 5, so that the foreign matters are effectively prevented from being blocked;

when water flows in the throttling channel 3, each half circle of water passes through one circular anti-blocking hole 53, and the water flow can realize the processes of speed reduction and pressure reduction due to the increase of the flow area, so that the throttling 'squeaking' and cavitation phenomena are reduced, and the service life of a structural part is effectively prolonged;

the upper cover sealing pieces 7 play a role in sealing, and the friction force generated by a large contact area between the upper cover sealing pieces 7 and the upper cover 4 can effectively provide the stability of the position of the regulating valve core 5 relative to the valve seat 1, so that the flow regulating precision is improved, and the manufacturing cost is reduced;

when the motor shaft 16 rotates, the adjusting valve core 5 and the motor shaft 16 rotate in the same direction and at the same rotating speed through the transmission of the D-shaped groove, and the cross-sectional area of the throttling channel 3 can be uniformly increased or reduced through adjusting the positive and negative rotation of the motor shaft 16; meanwhile, due to friction between the valve seat internal thread 2 and the valve core external thread 9, the adjusting valve core 5 can do linear up-and-down motion while rotating circumferentially, and the clearance between the motor shaft 16 and the D-shaped groove on the adjusting valve core 5 ensures the normal operation of the up-and-down motion, and the adjusting valve core has the advantages of simple and reliable transmission structure and low manufacturing cost.

Claims

1. The utility model provides a throttling valve, a serial communication port, including disk seat (1), adjust case (5) and upper cover (4), disk seat (1) is inside to be equipped with the intake antrum and goes out the water cavity, the upper end and the play water cavity of intake antrum are connected, water inlet (12) are connected to the intake antrum lower extreme, it connects delivery port (11) to go out water cavity lower extreme, be equipped with disk seat internal thread (2) on the play water cavity inner wall, install in disk seat (1) upper end upper cover (4), adjust case (5) set up in the inner chamber that disk seat (1) and upper cover (4) formed, the hypomere of adjusting case (5) is equipped with case external screw thread (9) that match with disk seat internal thread (2), the clearance between disk seat internal thread (2) and case external screw thread (9) forms spiral throttle passageway (3), the cross-section of spiral throttle passageway (3) is from last to reducing down gradually.

2. The throttling valve according to claim 1, characterized in that a plurality of anti-blocking holes (53) are distributed on the valve core external thread (9), the anti-blocking holes (53) are distributed on the external teeth of the valve core external thread (9), the aperture is smaller than the thread pitch of the valve core external thread (9), and the number of the anti-blocking holes (53) on each circle of external thread is 0-4.

3. The throttling valve according to claim 1, characterized in that the number of thread turns of the valve seat internal thread (2) and the valve core external thread (9) are both greater than 2, and the thread taper is one angle or a combination of angles in the range of 0-6 degrees.

4. The throttling valve according to claim 1, characterized in that a valve seat groove (10) is arranged on the bottom wall of the water outlet cavity of the valve seat (1) and outside the upper end of the water outlet (11);

a second valve seat sealing ring (8) is arranged at the upper end of the valve seat (1) and at the position contacted with the upper cover (4);

the upper section of the adjusting valve core (5) is provided with a plurality of upper cover sealing ring grooves (52), and upper cover sealing rings (7) are arranged in the upper cover sealing ring grooves (52).

5. The throttling valve according to claim 1, characterized in that the upper end surface of the upper cover (4) is provided with a through hole, the diameter of the through hole is matched with the outer diameter of the upper end of the regulating valve core (5), the diameter of the through hole is smaller than the maximum outer diameter of the regulating valve core (5), and when the regulating valve core (5) rotates to a state that the regulating valve core is limited by the through hole and cannot rise, the valve core external thread (9) is matched with the valve seat internal thread (2) in at least one circle.

6. The throttle valve according to claim 1, wherein the valve seat (1) and the regulating valve element (5) are made of plastic or metal, and when the valve seat (1) and the regulating valve element (5) are made of plastic, the valve seat (1) and the regulating valve element (5) are made of different materials.

7. An electric throttle valve, characterized in that, including the throttle valve, the speed reducing motor (13) and the motor shaft (16) of claim 1 or 2 or 3 or 4 or 5 or 6, there is a profiled valve core groove (51) on the inner wall of the upper section of the regulating valve core (5), the motor shaft (16) is inserted into the valve core groove (51), the upper end of the motor shaft (16) is connected with the speed reducing motor (13).

8. The electric throttle valve according to claim 7, characterized by further comprising a spool movement chamber (15), a top cover (17) and a position sensor (14), wherein the spool movement chamber (15) is fixedly connected with the upper cover (4), the top cover (17) is installed on the upper surface of the spool movement chamber (15), the position sensor (14) is arranged in the spool movement chamber (15) near the upper end of the motor shaft (16), and the speed reduction motor (13) is arranged on the top cover (17).

9. The electric throttle valve according to claim 7, characterized in that the motor shaft (16) is a D-shaped shaft or an H-shaped shaft, and the length is greater than or equal to the axial length of the spool external thread (9).

10. The electric throttle valve according to claim 7, characterized in that the position sensor (14) is one of a photoelectric switch, a micro switch or a jog switch, and the number is 1-2.