TW202102792A - High-sealing-performance high-pressure needle valve - Google Patents

Abstract

The invention relates to a high-sealing-performance high-pressure needle valve. The needle valve comprises a valve body, a valve rod, a valve element fixed at the tail end of the valve rod and a packing nut, wherein the valve body comprises a valve rod mounting boss which extends upwards along the top wall of the valve body. In addition, the high-pressure needle valve comprises a sealing element, an elastic element and a bearing force sleeve, wherein the sealing element, the elastic element and the bearing force sleeve are arranged in a valve rod hole and sequentially sleeve the valve rod from top to bottom. The packing nut is screwed on the upper portion of the valve rod hole and presses the sealing element; a jacking flange is arranged on the side wall of the valve rod and used for supporting the bearing force sleeve; a V-shaped groove is formed in the lower end face of the sealing element; and the lower end of the elastic element abuts against the bearing force sleeve, and the upper end of the elastic element is inserted in the V-shaped groove, so that a pressing force acting on the sealing element is effectively controlled within a reasonable range, and the sealing element is prevented from being damaged. In addition, more importantly, the sealing of the valve rod is realized by means of the expansion movement of the V-shaped groove, and a relatively high response speed is achieved.

Description

High-sealing high-pressure needle valve

The invention relates to the technical field of high-pressure needle valve manufacturing, in particular to a high-pressure needle valve with high sealing performance.

The high-pressure needle valve has the advantages of small fluid resistance, simple structure, compactness, reliable sealing, convenient operation and maintenance, and wide application range. It is widely used in machinery, chemical, petroleum and other industries. Its valve core is driven by the valve stem and runs along Move up and down along the axis of the valve stem to realize the opening/closing of the valve.

In the prior art, the valve stem is sealed by squeezing the packing nut along the axial direction of the packing to force the packing to deform in the radial direction, so as to achieve the purpose of sealing (as shown in Figure 1), but there is The following question: The size of the packing nut compression force has an intuitive and important influence on the tightness of the packing. When the pressing force is too large, it will cause serious deformation of the sealing packing, affecting the actual effect of the sealing, and even worse, leading to damage and failure of the sealing packing, and it will also cause the sealing packing and the valve stem to be too tight. Increasing the friction between the two will affect the sensitivity of the valve stem's lifting movement to a certain extent; and when the pressing force is reduced, the sealing packing takes a long time to recover in shape, and there is a gap in the sealing response. . When the pressing force is too small, the deformation of the sealing packing will be insufficient, which will lead to leakage. It can be seen that the actual sealing effect of this sealing method is not satisfactory, and the specific operation has greater uncertainty. Therefore, technical personnel are urgently required to solve the above-mentioned problems.

The technical problem to be solved by the present invention is to provide a high-pressure needle valve with simple structure design, high sealing performance, and fast response speed.

In order to solve the above technical problems, the present invention relates to a high-sealing high-pressure needle valve, which includes a valve body, a valve stem, a valve core, a packing nut and a handle. The valve body includes a valve stem mounting protrusion formed by extending upward along the top wall of the valve body. A valve stem hole for inserting the valve stem is opened in the inside of the valve stem mounting protrusion. On the left and right sides of the valve body, a medium inlet and a medium outlet are arranged along the direction orthogonal to the center axis of the valve stem hole. A transition cavity is provided inside the valve body and directly below the valve stem hole for connecting the medium inlet and the medium outlet. The valve core is fixed at the end of the valve stem, and the transition cavity is switched on/off by changing its position. In addition, the valve body further includes a sealing element, an elastic element and a bearing sleeve arranged inside the valve stem hole and sequentially sleeved on the valve stem along the up and down direction. The packing nut is screwed on the upper part of the valve stem hole and presses against the seal. A supporting flange is provided on the side wall of the valve stem for supporting the bearing sleeve. A V-shaped groove is opened on the lower end surface of the sealing element. The lower end of the elastic piece abuts against the bearing sleeve, and the upper end is inserted into the V-shaped groove.

As a further improvement of the above-mentioned technical solution, the above-mentioned sealing element is made of rubber with high fatigue resistance.

As a further improvement of the above technical solution, an arc-shaped transition arc is provided at the bottom of the V-shaped groove.

As a further improvement of the above technical solution, a receiving cavity is opened at the end of the valve stem for inserting the valve core. An elastic rubber ball is arranged on the top of the accommodating cavity and directly above the valve core.

As a further improvement of the above technical solution, the lower end of the valve core is set to be larger The lower cone is smaller, and correspondingly, the transition cavity adapted to it is also set in a cone.

As a further improvement of the above-mentioned technical solution, the above-mentioned high-tightness and high-pressure needle valve further includes a sealing ring, and correspondingly, an annular installation groove for accommodating the valve core is provided on the tapered side wall of the valve core.

As a further improvement of the above technical solution, the above elastic member is preferably a cylindrical spring.

As a further improvement of the above technical solution, the handle is composed of a rotating part and a connecting part arranged in an up-and-down direction, wherein a threaded hole is opened on the side wall of the connecting part to achieve fixation with the valve stem by means of a handle fixing screw , Correspondingly, the corresponding position of the valve stem is provided with a supporting plane.

As a further improvement of the above technical solution, a friction increasing groove is provided on the side wall of the rotating part. The number of friction increasing grooves is set to be multiple, and they are evenly distributed in the circumferential direction along the central axis of the rotating part.

Compared with the high-pressure needle valve of the traditional design structure, in the technical solution disclosed in the present invention, the valve stem is sealed by the cooperation of the elastic member and the sealing member, so that the pressure acting on the sealing member can be effectively reduced. Rely on control in a reasonable range value to prevent damage to itself, ensure the service life of its seals, and reduce the frequency of subsequent maintenance. In addition, more importantly, as the elastic force of the elastic element increases, the depth of its insertion into the V-shaped groove increases, and the amount of expansion and deformation of the V-shaped groove gradually increases, thereby rapidly realizing the valve stem. Sealing, in this way, has a faster response speed, ensuring that the high-pressure needle valve has a better sealing reliability.

1: Valve body

11: Valve stem installation protrusion

111: Stem hole

12: Medium inlet

13: Medium outlet

14: Transition cavity

15: Seal

151: V-shaped groove

16: elastic parts

17: bearing sleeve

2: Valve stem

21: against the flange

22: receiving cavity

23: leaning against the cut plane

3: Spool

4: Packing nut

5: handle

51: Rotating part

511: Friction increasing groove

52: connecting part

6: Elastic rubber ball

7: Sealing ring

8: Handle fixing screw

Fig. 1 is a schematic diagram of the structure of a high-pressure needle valve in the prior art.

Fig. 2 is a schematic structural view of the first embodiment of the high-sealing high-pressure needle valve of the present invention.

Fig. 3 is a partial enlarged view of I in Fig. 2.

Fig. 4 is a schematic structural view of a second embodiment of the high-tightness and high-pressure needle valve of the present invention.

Fig. 5 is a three-dimensional schematic diagram of the sealing member in the high-sealing high-pressure needle valve of the present invention.

Fig. 6 is a structural schematic diagram of the handle in the high-tightness and high-pressure needle valve of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for It is convenient to describe the present invention and simplify the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

The technical solution disclosed in the present invention will be described below with examples. Figure 2 shows a schematic structural view of the first embodiment of the high-sealing high-pressure needle valve of the present invention, which is mainly composed of the valve body 1, the valve stem 2, the valve core 3, The packing nut 4 and the handle 5 are composed of several parts. Wherein, the valve body 1 includes a valve stem mounting protrusion 11 extending upwardly along its top wall, and a valve stem hole 111 for inserting the valve stem is opened inside the valve stem mounting protrusion 11. On the left and right sides of the valve body 1, a medium inlet 12 and a medium outlet 13 are provided along a direction orthogonal to the central axis of the valve stem hole 111. A transition cavity 14 is provided in the interior of the valve body 1 and directly below the valve stem hole 111 to communicate the above-mentioned medium inlet 12 and the medium outlet 13. The valve core 3 is fixed at the end of the valve stem 2, and it follows the valve stem 2 to move up and down to realize the transition of the opening/closing state of the transition chamber 14, so as to realize the communication between the medium inlet 12 and the medium outlet 13. In addition, the above-mentioned valve body 1 also includes a valve stem hole 111 The sealing member 15, the elastic member 16, and the bearing sleeve 17 are sequentially sleeved on the valve stem 2 along the up and down direction. The packing nut 4 is screwed on the upper part of the valve stem hole 111 and presses the seal 15 against it. An abutting flange 21 is provided on the side wall of the valve stem 2 for supporting the aforementioned bearing sleeve 17. A V-shaped groove 151 is opened on the lower end surface of the sealing member 15 (as shown in FIG. 5). The lower end of the elastic member 16 abuts against the bearing sleeve 17, and the upper end of the elastic member 16 is inserted into the V-shaped groove 151. In the technical solution disclosed in the present invention, the valve stem 2 is sealed by the mutual cooperation of the elastic member 16 and the sealing member 15, so that the pressing force acting on the sealing member 15 can be effectively controlled within a reasonable range. , To prevent itself from being damaged, to ensure the service life of its seal 15 and reduce the frequency of subsequent maintenance. In addition, more importantly, as the elastic force of the elastic member 16 increases, the depth of its insertion into the V-shaped groove 151 also increases accordingly, and the expansion and deformation of the V-shaped groove 151 itself gradually increases, thereby rapidly The sealing of the valve stem 2 is realized so as to have a faster response speed to ensure that the high-pressure needle valve has a better sealing reliability.

What needs to be emphasized here is that the above-mentioned elastic member 16 is preferably a cylindrical spring, of course, other types of elastic members can also be selected according to actual conditions.

The operating principle of the above-mentioned high-pressure sealing high-pressure needle valve is as follows: When the position of the valve stem 2 relative to the valve body 1 is determined, the bearing sleeve 17, the cylindrical spring, and the sealing element 15 are sequentially placed in the stem hole 111, and then The packing nut 4 is used to press against the seal 15. During the above installation operation, it is necessary to pay attention to the relative position of the cylindrical spring to ensure that its opening ring is sunk in the V-shaped groove 151 (as shown in FIG. 3). With the gradual screwing in of the packing nut 4, the depth of the cylindrical spring extending into the V-shaped groove 151 increases, so that the V-shaped groove 151 expands to both sides at the same time, thereby realizing the sealing of the valve stem 2.

During the specific use of the high-pressure needle valve, the V-shaped groove 151 of the seal 15 needs to be It has to undergo multiple expansion and contraction circular motions, so it is required to have good fatigue resistance. For this reason, the above-mentioned seal 15 is preferably made of high fatigue resistance rubber to ensure that the valve stem 2 has a stable, reliable and durable sealing performance with respect to the valve body 1.

It is known that during the deformation of the V-shaped groove 151, the closer the position to the bottom of the V-shaped groove 151, the more likely it is that fatigue and cracks occur. For this reason, an arc-shaped transition arc can be provided at the bottom of the V-shaped groove 151. (Not shown in the figure), in order to optimize the force condition of this area as much as possible and increase the service life of the seal as much as possible. 1

Furthermore, in consideration of the convenience of replacing the valve core 3, the fixing form of the valve core 3 relative to the valve stem 2 can also be set as a detachable connection. The specific implementation is as follows: a receiving cavity is opened at the end of the valve stem 2 22. Used to insert the spool 3. An external thread is provided on the outer side wall of the valve core 3, and correspondingly, an internal thread adapted to the above-mentioned external thread is provided on the inlet side wall of the containing cavity 22.

Of course, an elastic rubber ball 6 (as shown in FIG. 2) can also be provided on the top of the containing cavity 22 and directly above the valve core 3. The elastic rubber ball 6 always exerts a certain elastic pressing force on the top wall of the valve core 3. In this way, when the valve stem 2 is deflected relative to the axial center line of the valve stem hole 111, the valve core 3 can carry out its own operation. The offset angle is adjusted to reduce the wear relative to the side wall of the valve stem hole 111 as much as possible, to ensure the smooth movement of the valve core 3 and the reliable sealing of the transition cavity 14.

Fig. 4 shows a schematic structural view of the second embodiment of the high-sealing high-pressure needle valve of the present invention. Compared with the above-mentioned first embodiment, the difference is that the lower end of the valve stem 2 is set to be larger and smaller. Correspondingly, the top of the transition chamber 14 is also set to be tapered. In this way, on the one hand, it effectively ensures the fitting accuracy of the valve stem 2 with respect to the transition chamber 14 and ensures that the medium inlet 12 Effective isolation from the medium outlet 13; on the other hand, when the valve stem 2 is worn relative to the side wall of the transition chamber 14, the taper fitting mode can immediately self-compensate to prevent leakage Dew happened.

Of course, an annular installation groove for accommodating the end side wall of the valve stem 2 can also be opened to cooperate with the installation of the sealing ring 7 (as shown in FIG. 4), thereby further preventing the valve stem 2 from being relative to the transition cavity. 14 The occurrence of leakage.

As a further refinement of the above-mentioned high-pressure needle valve structure, its handle 5 is composed of a rotating part 51 and a connecting part 52 arranged in order in the up and down direction (as shown in FIG. 6), wherein a side wall of the connecting part 52 is provided There are threaded holes to realize the fixation with the valve stem 2 by means of the handle fixing screw 8. Correspondingly, an abutting plane 23 is provided at the corresponding position of the valve stem 2 (as shown in Fig. 2). In this way, on the premise of ensuring the reliability of the connection between the handle 5 and the valve stem 2, the time required for the separation of the two is as low as possible, and the difficulty of subsequent maintenance is reduced.

Furthermore, in order to facilitate the rotation of the handle 5 during actual use, a friction increasing groove 511 (as shown in FIG. 6) can also be provided on the side wall of the rotation portion 51 to prevent the operator from rotating During the process, the hand slips, which improves the comfort of operation. Specifically, the number of the friction increasing grooves 511 is set to be multiple, and the grooves 511 are evenly distributed in the circumferential direction along the central axis of the rotating portion 51.

The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

1: Valve body

11: Valve stem installation protrusion

111: Stem hole

12: Medium inlet

13: Medium outlet

14: Transition cavity

15: Seal

16: elastic parts

17: bearing sleeve

2: Valve stem

21: against the flange

22: receiving cavity

23: leaning against the cut plane

3: Spool

4: Packing nut

5: handle

6: Elastic rubber ball

8: Handle fixing screw

Claims (9)

A high-sealing high-pressure needle valve, which includes a valve body, a valve stem, a valve core, a packing nut, and a handle; the valve body includes a valve stem mounting protrusion formed by extending upward along its top wall; The inside of the mounting protrusion is provided with a valve stem hole for the valve stem to be inserted; on the left and right sides of the valve body, a medium inlet and a medium inlet are provided along the direction orthogonal to the center axis of the valve stem hole. A medium outlet; inside the valve body, just below the valve stem hole is provided with a transition cavity for connecting the medium inlet and the medium outlet; the valve core is fixed to the end of the valve stem , Through the change of its position to achieve the transition of the opening/closing state of the transition cavity, characterized in that, the valve body further includes the valve body is arranged inside the valve stem hole, and is sequentially sleeved along the up and down direction. The sealing element, the elastic element and the bearing sleeve on the valve stem; the packing nut is screwed on the upper part of the valve stem hole and presses the sealing element; on the side wall of the valve stem is provided The supporting flange is used to support the bearing sleeve; a V-shaped groove is opened on the lower end surface of the sealing member; the lower end of the elastic member abuts against the bearing sleeve, and the upper end is inserted into the bearing sleeve. Set in the V-shaped groove. The high-tightness and high-pressure needle valve according to claim 1, wherein the seal is made of rubber with high fatigue resistance. The high-tightness and high-pressure needle valve according to claim 1, wherein an arc-shaped transition arc is provided at the bottom of the V-shaped groove. The high-tightness and high-pressure needle valve according to any one of claims 1-3, wherein a receiving cavity is opened at the end of the valve stem for inserting the valve core; in the receiving cavity An elastic rubber ball is arranged on the top of the valve core and directly above the valve core. The high-tightness and high-pressure needle valve according to any one of claims 1-3, wherein the The lower end of the valve core is set in a tapered shape with a large upper and a small lower end. Correspondingly, the transition cavity adapted to it is also set in a tapered shape. The high-tightness and high-pressure needle valve according to claim 5, further comprising a sealing ring, and correspondingly, an annular installation groove for accommodating the valve core is provided on the tapered side wall of the valve core. The high-sealing high-pressure needle valve according to any one of claims 1 to 3, wherein the elastic member is a cylindrical spring. The high-tightness and high-pressure needle valve according to any one of claims 1-3, wherein the handle is composed of a rotating part and a connecting part arranged in an up-down direction, wherein the connecting part A threaded hole is opened on the side wall of the valve to realize the fixation with the valve stem by means of a handle fixing screw. Correspondingly, an abutting plane is provided at the corresponding position of the valve stem. The high-pressure needle valve quick installation structure according to claim 8, wherein a friction increasing groove is provided on the side wall of the rotating part; the number of the friction increasing groove is set to be multiple, and The central axis of the rotating part is evenly distributed in the circumferential direction.

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