High-pressure regulating valve capable of stabilizing output pressure

Abstract

The invention relates to the technical field of pressure regulating valves, and discloses a high-pressure pressure regulating valve capable of stabilizing output pressure. The pressure balance valve comprises a valve body and an electric actuator arranged at the top of the valve body, a valve seat, a valve rod, a sealing sleeve and a middle supporting column are arranged in the valve body, a first seal, a second seal and a third seal are arranged on the sealing sleeve, and a pressure balance cavity is formed between the first seal and the second seal. A pressure balancing hole communicated with the pressure balancing cavity is formed in the bottom end of the valve rod, so that when the lower end of the valve rod is pressed, a pressure medium can enter the pressure balancing cavity through the pressure balancing hole to form pressure balance, and a flow dividing cavity is formed between the second seal and the third seal; the sealing sleeve is provided with a drainage hole communicated with the pressure balance cavity and the flow dividing cavity. The anti-seepage capacity is improved by improving the anti-seepage structure, so that the influence of medium seepage on the stability of the pressure regulating valve is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure regulating valves, and in particular to a high-pressure pressure regulating valve with stable output pressure. Background Art

[0002] A pressure regulating valve is a device commonly used to control the pressure of gas or liquid. It controls the flow rate by changing the size of the medium flow cross-sectional area, thereby achieving the purpose of pressure control. Pressure regulating valves generally include mechanical pressure regulating valves, electric pressure regulating valves, pneumatic pressure regulating valves, etc. For common mechanical pressure regulating valves, the pressure regulating valve is mainly composed of a valve body, a valve stem and a valve core, a spring and an adjusting device. The valve body is the main part of the pressure regulating valve, and there are channels and chambers inside to achieve the circulation of liquid and pressure regulation. The valve core is a key regulating component, which can move up and down under the action of the spring, thereby changing the flow area and pressure of the valve. The main function of the spring is to provide a reset force to ensure that the valve core can return to its initial position after the adjustment is completed. The adjusting device is used to operate the valve core to achieve flow regulation and pressure stability.

[0003] Among them, a sealing structure is provided between the valve body and the valve stem to prevent leakage of the pressure regulating valve. Once the pressure regulating valve leaks, it will affect the overall stability. The sealing structure of the existing pressure regulating valve is mostly just a single sealing ring, which is generally only suitable for conventional medium transportation and pressure regulation. Under high pressure, the probability of leakage will increase. Therefore, it is necessary to propose a high-pressure pressure regulating valve with stable output pressure. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a high-pressure pressure regulating valve with stable output pressure.

[0005] The present invention is implemented by the following technical scheme: a valve body and an electric actuator arranged on the top of the valve body, wherein the valve body is provided with a valve seat, a valve stem, a sealing sleeve and an intermediate pillar, the sealing sleeve is respectively provided with a first seal, a second seal and a third seal, a pressure balance chamber is provided between the first seal and the second seal, a pressure balance hole connected to the pressure balance chamber is provided at the bottom end of the valve stem, so that when the lower end of the valve stem is pressurized, the pressure medium will enter the pressure balance chamber through the pressure balance hole to form a pressure balance, a diversion chamber is provided between the second seal and the third seal, and a drainage hole connecting the pressure balance chamber and the diversion chamber is provided on the sealing sleeve, which can guide a small amount of leaked medium after the first seal and the second seal fail to the pressure balance chamber.

[0006] As a further improvement of the above solution, the first seal is composed of two Gly rings, the second seal is composed of a Gly ring and a U-shaped ring, and the third seal is a single packing ring.

[0007] As a further improvement of the above solution, the packing ring is composed of a plurality of overlapping V-shaped rings, and the plurality of V-shaped rings are connected vertically.

[0008] As a further improvement of the above scheme, the valve stem consists of two parts: a rod body at the top and a valve core at the bottom. The contact position between the top of the valve seat and the valve core is funnel-shaped, and the bottom end of the valve core is a cone that matches the valve seat, thereby increasing the contact area between the two.

[0009] As a further improvement of the above solution, a first spring is arranged in the valve seat, and the top end of the first spring abuts against the valve core at the bottom end of the valve stem.

[0010] As a further improvement of the above scheme, a groove is provided at the connection point between the drainage hole and the pressure balance chamber, and a one-way valve plate is provided in the groove, so that the medium that penetrates into the diversion chamber can enter the pressure balance chamber normally through the drainage hole, and the medium in the pressure balance chamber will not flow back into the drainage hole.

[0011] As a further improvement of the above solution, a buffer tube is provided in the pressure balance hole, and a flow blocking block is provided in the buffer tube, so as to reduce the pressure applied by the medium to the pressure balance chamber.

[0012] As a further improvement of the above solution, a plug is provided in the valve seat, and the bottom end of the buffer tube is in contact with the plug. When the valve stem completely closes the inlet on the valve seat, the plug can prevent the medium from continuing to enter the pressure balance chamber.

[0013] As a further improvement of the above scheme, the blockage is a telescopic reset structure, which consists of a sleeve, a blocking cap telescopically installed in the sleeve and a second spring, so that when the valve stem rises to squeeze the medium in the pressure balance chamber, the medium can smoothly push open the blockage and be discharged.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By setting a pressure balance chamber and a pressure balance hole between the first seal and the second seal, the pressure balance chamber can improve the anti-seepage effect of the first seal. This design can introduce the medium into the pressure balance chamber to offset the penetration pressure originally applied to the first seal, thereby reducing the permeability of the medium to the first seal, thereby improving the anti-seepage effect of the first seal. For example, if the pressure of the medium in the middle pillar penetrating the first seal is 10Pa, the pressure applied to the second seal after the collapse of the first seal is 8Pa, and after part of the medium is introduced into the pressure balance chamber through the pressure balance hole, the penetration pressure of the medium in the pressure balance chamber on the first seal and the second seal is 3Pa respectively. Therefore, in the current situation, the penetration force of the medium on the first seal is reduced from 10Pa to 7Pa, which is less than the original penetration pressure of the medium on the first seal, and the medium in the pressure balance chamber has a small penetration pressure and will not affect the second seal. In addition, the pressure medium will act on the valve stem step section at the lower end of the pressure balance chamber, and basically balance the pressure at the lower end of the valve stem, so that the valve stem is almost not affected by pressure when it moves up and down. At the same time, under the action of the pressure balance chamber, the starting torque of the valve stem can also be reduced; By setting a shunt cavity between the second seal and the third seal, and setting a drainage hole between the shunt cavity and the pressure balance cavity, a fourth seal intercepting between the second seal and the third seal can be formed. Even if the first seal and the second seal are penetrated, resulting in a small amount of medium diffusing to the third seal, the penetrated medium will first enter the shunt cavity, and then enter the pressure balance cavity through the drainage hole; By setting a one-way valve between the drainage hole and the pressure balance chamber, the medium in the pressure balance chamber cannot be reversed to the diversion chamber through the drainage hole, but the medium in the diversion chamber can enter the pressure balance chamber normally, and as the valve stem is adjusted up and down, when the valve stem rises, its step part will squeeze the medium in the pressure balance chamber, so that the medium is discharged through the pressure balance hole, and when it falls, the negative pressure formed will guide the one-way valve to open, and let the medium in the drainage hole smoothly enter the pressure balance chamber; By setting a buffer tube in the valve seat, it is possible to avoid excessive pressure applied by the medium to the pressure balance chamber, which will have a counter-effect. When the valve stem blocks the inlet on the valve seat, the originally dispersed medium pressure is concentrated on the bottom of the valve core of the valve stem. The pressure balance hole and the pressure balance chamber serve as vent holes and are subjected to greater pressure. In order to avoid the medium using the pressure balance chamber as a penetration point, it is necessary to set a blockage in the valve seat to seal the buffer tube when the valve core is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram showing the overall structure of the high-pressure pressure regulating valve for stabilizing output pressure of the present invention; Figure 2 A cross-sectional view of a high-pressure pressure regulating valve for stabilizing output pressure according to the present invention; Figure 3 It is a front plan cross-sectional illustration of a high-pressure pressure regulating valve for stabilizing output pressure of the present invention; Figure 4 The disassembled planar cross-sectional view of the high-pressure pressure regulating valve for stabilizing the output pressure of the present invention; Figure 5 A plan cross-sectional view showing the internal structure of the high-pressure pressure regulating valve for stabilizing output pressure of the present invention; Figure 6 Illustration of valve seat, buffer tube and plug; Figure 7 A cross-sectional view showing a buffer tube and a blockage; Figure 8 This is a cross-sectional view of the third sealing packing ring.

[0016] Description of main symbols: 1. Valve housing; 2. Threaded gland; 3. Actuator connecting plate; 4. Valve cover; 5. Valve stem; 6. Valve seat; 7. Sealing sleeve; 8. Intermediate support; 9. First seal; 10. Second seal; 11. Third seal; 12. Packing gland; 13. Pressure balance chamber; 14. Pressure balance hole; 15. Diverter chamber; 16. Drainage hole; 17. One-way valve plate; 18. First spring; 19. Buffer tube; 20. Blockage; 21. Electric actuator. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Please combine Figures 1 to 8 , a high-pressure pressure regulating valve for stabilizing output pressure, comprising: a valve body consisting of a valve housing 1, a threaded gland 2 arranged on the valve housing 1, an actuator connecting plate 3 arranged on the threaded gland 2, a valve cover 4 arranged inside the valve housing 1, an inlet flange arranged at the bottom of the valve housing 1 and an outlet flange arranged on one side of the valve housing 1, an electric actuator 21 is installed on the actuator connecting plate 3, a valve seat 6 is arranged in the valve body, a sealing ring is arranged at the bottom of the valve seat 6, an intermediate support 8 is arranged at the top of the valve seat 6, a through hole is arranged on the intermediate support 8, a sealing sleeve 7 is arranged on the intermediate support 8, two sealing rings are sleeved on the sealing sleeve 7, a valve stem 5 is arranged in the sealing sleeve 7, the top of the valve stem 5 is connected with the control rod of the electric actuator 21, the valve stem 5 is threadedly connected with the threaded gland 2, when the valve stem 5 rotates, it can be lifted and lowered under the action of the thread, and the sealing sleeve 7 is respectively provided with a first seal 9, a second seal 9 and a third seal 9. The second seal 10 and the third seal 11, the first seal 9 is composed of two Gly rings, the second seal 10 is composed of a Gly ring and a U-shaped ring, the third seal 11 is a single packing ring, a packing gland 12 is provided on the sealing sleeve 7, the packing gland 12 is pressed against the third seal 11, a pressure balance chamber 13 is provided between the first seal 9 and the second seal 10, the bottom end of the valve stem 5 is provided with a pressure balance hole 14 connected to the pressure balance chamber 13, so that when the lower end of the valve stem 5 is pressurized, the pressure medium will enter the pressure balance chamber 13 through the pressure balance hole 14 to form a pressure balance, a diverter chamber 15 is provided between the second seal 10 and the third seal 11, and a drainage hole 16 connecting the pressure balance chamber 13 and the diverter chamber 15 is provided on the sealing sleeve 7, which can guide a small amount of leaked medium after the failure of the first seal 9 and the second seal 10 to the pressure balance chamber 13.

[0019] Through the above technical solution, by setting the pressure balance chamber 13 and the pressure balance hole 14 between the first seal 9 and the second seal 10, the pressure balance chamber 13 can improve the anti-seepage effect of the first seal 9. This design can introduce the medium into the pressure balance chamber 13 to offset the penetration pressure originally applied to the first seal 9, thereby reducing the permeability of the medium to the first seal 9, thereby improving the anti-seepage effect of the first seal 9, and the pressure medium will act on the step section of the valve stem 5 at the lower end of the pressure balance chamber 13, and basically balance the pressure at the lower end of the valve stem 5, so that when the valve stem 5 moves up and down for adjustment, It is almost unaffected by pressure. At the same time, under the action of the pressure balance chamber 13, the starting torque of the valve stem 5 can also be reduced. By setting a diverter chamber 15 between the second seal 10 and the third seal 11, and setting a drainage hole 16 between the diverter chamber 15 and the pressure balance chamber 13, a fourth seal intercepted between the second seal 10 and the third seal 11 can be formed. Even if the first seal 9 and the second seal 10 penetrate, causing a small amount of medium to diffuse to the third seal 11, the penetrated medium will first enter the diverter chamber 15, and then enter the pressure balance chamber 13 through the drainage hole 16.

[0020] Please combine Figure 8 The packing ring is composed of a plurality of V-shaped rings overlapped and connected up and down.

[0021] Through the above technical solution, the structure causes the V-ring to expand when the medium penetrates from bottom to top, thereby further increasing the contact between the V-ring and the valve stem 5 and the sealing sleeve 7, further improving the anti-permeation effect, and when the medium between the two V-rings is pressurized after penetration, the upper V-ring will expand to increase the anti-permeation effect, while the lower V-ring will be forced to shrink, thereby allowing the medium to flow back, thereby ensuring a good anti-permeation effect.

[0022] Please combine Figure 5 The valve stem 5 is composed of a rod body at the top and a valve core at the bottom. The contact position between the top of the valve seat 6 and the valve core is funnel-shaped, and the bottom end of the valve core is a cone that matches the valve seat 6.

[0023] Through the above technical scheme, the contact area between the two can be increased to ensure the sealing of the two. At the same time, due to the large adjustment pressure, the friction between the valve seat 6 and the valve core is relatively large, and the wear problem cannot be ignored. A layer of wear-resistant alloy is welded at the joint of the valve seat 6 and the valve core, so that the valve seat 6 and the valve core can run more smoothly, and the service life is more than twice that of the conventional valve seat 6 and valve core.

[0024] Please combine Figure 5 A first spring 18 is arranged in the valve seat 6 , and the top end of the first spring 18 abuts against the valve core at the bottom end of the valve stem 5 .

[0025] Through the above technical solution, since the upper end of the valve stem 5 is threadedly connected to the threaded gland 2, and the internal thread is connected to the external thread, the size of the gap directly affects the accuracy and stability of the pressure-stabilizing valve. In order to reduce the thread gap, a first spring 18 is arranged between the valve seat 6 and the valve stem 5. The reaction force of the first spring 18 eliminates the thread gap, stabilizes the position of the valve stem 5, and ensures the stability of the outlet pressure.

[0026] Please combine Figure 5 A groove is provided at the connection point between the drainage hole 16 and the pressure balance chamber 13, and a one-way valve plate 17 is provided in the groove, so that the medium that penetrates into the diversion chamber 15 can enter the pressure balance chamber 13 normally through the drainage hole 16, and the medium in the pressure balance chamber 13 will not flow back into the drainage hole 16.

[0027] Please combine Figures 5 to 7 A buffer tube 19 is arranged in the pressure balance hole 14, and a flow block is arranged in the buffer tube 19, so as to reduce the pressure applied by the medium to the pressure balance chamber 13. A plug 20 is arranged in the valve seat 6, and the bottom end of the buffer tube 19 contacts the plug 20. When the valve stem 5 completely closes the inlet on the valve seat 6, the plug 20 can prevent the medium from continuing to enter the pressure balance chamber 13. The plug 20 is a telescopic reset structure, which consists of a sleeve, a plug cap telescopically installed in the sleeve and a second spring, so that when the valve stem 5 rises and squeezes the medium in the pressure balance chamber 13, the medium can smoothly push open the plug 20 and discharge, thereby preventing the medium in the pressure balance chamber 13 from being unable to be discharged smoothly and causing damage and penetration to the first seal 9 and the second seal 10.

[0028] Through the above technical solution, a buffer tube 19 is arranged in the valve seat 6 to avoid excessive pressure applied by the medium to the pressure balance chamber 13 and causing a counter-effect. When the valve stem 5 blocks the inlet on the valve seat 6, the originally dispersed medium pressure is concentrated at the bottom of the valve core of the valve stem 5. The pressure balance hole 14 and the pressure balance chamber 13 serve as vent holes and are subjected to greater pressure. In order to avoid the medium from using the pressure balance chamber 13 as a penetration point, a plug 20 needs to be arranged in the valve seat 6 to seal the buffer tube 19 when the valve core is closed.

[0029] The implementation principle of a high-pressure pressure regulating valve for stabilizing output pressure in the embodiment of the present application is: A pressure transmitter is installed at the outlet of the pressure regulating valve, which can transmit the pressure value to the central control system. When the pressure is higher or lower than the set pressure, the central control system transmits the signal to the electric actuator 21. The electric actuator 21 performs the forward or reverse rotation task according to the electrical signal. The electric actuator 21 drives the valve stem 5 to rotate forward or reverse to realize the rotation and rise of the valve core, thereby achieving the opening of the valve core and the valve seat 6. After the medium enters the middle pillar 8 through the inlet on the valve seat 6, it will enter the flow cavity between it and the valve housing 1 through the through hole on the middle pillar 8, and finally be discharged through the discharge flange; When the pressure regulating valve is in the open state, when the valve core on the valve stem 5 is separated from the valve seat 6, the buffer tube 19 will also be blocked 20 and in the separated state. At this time, part of the medium will enter the pressure balance chamber 13 through the buffer tube 19 and the pressure balance hole 14. By allowing the pressure medium to exist in the pressure balance chamber 13, the medium in the pressure balance chamber 13 will apply pressure to the first seal 9 and the second seal 10, thereby offsetting the pressure from below to a certain extent (for example, if the pressure of the medium in the middle pillar 8 penetrating the first seal 9 is 10Pa, the pressure applied to the second seal 10 after the first seal 9 collapses is 8Pa, and part of the medium is introduced into the pressure balance chamber 13 through the pressure balance hole 14. After entering the pressure balance chamber 13, the penetration pressure of the medium in the pressure balance chamber 13 on the first seal 9 and the second seal 10 is 3Pa respectively. Therefore, in the current situation, the penetration force of the medium on the first seal 9 is reduced from 10Pa to 7Pa, which is less than the original penetration pressure of the medium on the first seal 9. The penetration pressure of the medium in the pressure balance chamber 13 is small and will not affect the second seal 10). In addition, the pressure medium will act on the step section of the valve stem 5 at the lower end of the pressure balance chamber 13, and is basically balanced with the pressure at the lower end of the valve stem 5, so that the valve stem 5 is almost not affected by pressure when it moves up and down for adjustment. At the same time, under the action of the pressure balance chamber 13, the starting torque of the valve stem 5 can also be reduced; At the same time, even if the first seal 9 and the second seal 10 penetrate, causing a small amount of medium to diffuse toward the third seal 11, the penetrated medium will first enter the diverter chamber 15, and then enter the pressure balance chamber 13 through the drainage hole 16. However, due to the action of the one-way valve plate 17, the medium in the pressure balance chamber 13 cannot be reversed to the diverter chamber 15 through the drainage hole 16.

[0030] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A high-pressure regulating valve for stabilizing output pressure, comprising a valve body and an electric actuator (21) arranged on the top of the valve body, wherein a valve seat (6), a valve stem (5), a sealing sleeve (7) and an intermediate support (8) are arranged in the valve body, and characterized in that: The sealing sleeve (7) is respectively provided with a first seal (9), a second seal (10) and a third seal (11); A pressure balancing chamber (13) is provided between the first seal (9) and the second seal (10), and a pressure balancing hole (14) communicating with the pressure balancing chamber (13) is provided at the bottom end of the valve stem (5), so that when the lower end of the valve stem (5) is pressurized, the pressure medium enters the pressure balancing chamber (13) through the pressure balancing hole (14) to form a pressure balance; A flow diversion chamber (15) is provided between the second seal (10) and the third seal (11), and a drainage hole (16) is provided on the sealing sleeve (7) for connecting the pressure balance chamber (13) and the flow diversion chamber (15), so as to guide a small amount of leaked medium after the first seal (9) and the second seal (10) fail to the pressure balance chamber (13).

2. The high-pressure regulating valve for stabilizing output pressure according to claim 1, characterized in that: The first seal (9) is composed of two Gly rings, the second seal (10) is composed of a Gly ring and a U-shaped ring, and the third seal (11) is a single packing ring.

3. The high-pressure regulating valve with stable output pressure according to claim 2, characterized in that: The packing ring is composed of a plurality of V-shaped rings overlapped and combined, and the plurality of V-shaped rings are connected vertically.

4. The high-pressure regulating valve for stabilizing output pressure according to claim 1, characterized in that: The valve stem (5) is composed of two parts: a stem body at the top and a valve core at the bottom. The contact position between the top of the valve seat (6) and the valve core is funnel-shaped, and the bottom end of the valve core is conical and matched with the valve seat (6), thereby increasing the contact area between the two.

5. The high-pressure regulating valve for stabilizing output pressure according to claim 1, characterized in that: A first spring (18) is arranged in the valve seat (6), and the top end of the first spring (18) abuts against the valve core at the bottom end of the valve stem (5).

6. The high-pressure regulating valve with stable output pressure according to claim 1, characterized in that: A groove is provided at the connection point between the drainage hole (16) and the pressure balance chamber (13), and a one-way valve plate (17) is provided in the groove, so that the medium that has infiltrated into the diversion chamber (15) can normally pass through the drainage hole (16) and enter the pressure balance chamber (13), while the medium in the pressure balance chamber (13) will not flow back into the drainage hole (16).

7. The high-pressure regulating valve for stabilizing output pressure according to claim 1, characterized in that: A buffer tube (19) is arranged in the pressure balance hole (14), and a flow block is arranged in the buffer tube (19), thereby reducing the pressure applied by the medium to the pressure balance chamber (13).

8. The high-pressure regulating valve for stabilizing output pressure according to claim 7, characterized in that: A plug (20) is provided in the valve seat (6), and the bottom end of the buffer tube (19) is in contact with the plug (20). When the valve stem (5) completely closes the inlet on the valve seat (6), the plug (20) can prevent the medium from continuing to enter the pressure balance chamber (13).

9. The high-pressure regulating valve for stabilizing output pressure according to claim 8, characterized in that: The plug (20) is a telescopic reset structure, which is composed of a sleeve, a plug cap telescopically mounted in the sleeve, and a second spring, so that when the valve stem (5) rises to squeeze the medium in the pressure balance chamber (13), the medium can smoothly push open the plug (20) and be discharged.

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