Electric control pilot-operated type pressure regulating valve

Abstract

The utility model relates to the technical field of pressure regulating valves, and particularly discloses an electric control pilot-operated type pressure regulating valve, which comprises a valve body, a main valve core, a valve seat and a driving piece, the main valve core comprises an upper valve core and a lower valve core, an air inlet, a working port and an exhaust port are arranged on the valve body, a pilot-operated cavity is further arranged on the valve body, and air is fed and discharged through the pilot-operated cavity. The upper valve element and the lower valve element are fixedly connected in an interference fit mode, no leakage point exists between the upper valve element and the lower valve element, and in the displacement process of the main valve element, only a dynamic sealing point between the lower valve element and the inner wall of the valve body needs to be reserved, so that the working port is communicated with the air inlet or the air outlet. Therefore, leakage caused by abrasion of multiple sealing points can be greatly reduced, and the overall sealing performance is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pressure regulating valve especially direct an electric control pilot type pressure regulating valve. BACKGROUND

[0002] In the design of traditional pilot type pressure regulating valve, the main valve part usually contains multiple sealing elements to realize pressure compensation function. However, this multiple sealing structure has significant defects: first, the existence of multiple dynamic sealing points leads to a substantial increase in friction resistance when the valve core moves, not only reducing the response speed and adjustment accuracy of the system, but also aggravating the wear of components due to long-term friction, shortening the service life of the product; second, frequent failure of the sealing elements increases the risk of leakage, especially under high pressure or high frequency working conditions, leakage problems may cause environmental pollution and even safety accidents; in addition, the complex structure of traditional design limits the compactness of the valve body, which is not conducive to the development of integration and miniaturization, and it is difficult to meet the needs of modern industrial equipment for high precision, low power consumption and long service life.

[0003] In existing public documents (such as CN20181012345.6, US2020 / 0078912A1), although it is proposed to improve the leakage problem by optimizing the sealing material or increasing the redundant sealing structure, these schemes do not fundamentally reduce the number of sealing points, but on the contrary, the structure is complicated, leading to increased manufacturing cost and increased maintenance difficulty. SUMMARY

[0004] The utility model considers the foregoing problem and makes, the utility model discloses a kind of electric control pilot type pressure regulating valve, can reduce dynamic sealing point to one, wear less to sealing element, reduce leakage risk.

[0005] To achieve the above object, the utility model provides an electric control pilot type pressure regulating valve, including valve body, main valve core, valve seat and driving piece, the valve body is equipped with inlet, working port and exhaust port, the main valve core and the valve seat are located in the valve body, the driving piece is used to drive the main valve core in the valve body displacement by the valve seat,

[0006] The main valve core includes upper valve core and lower valve core, the lower end of the upper valve core can be pressed into the lower valve core, and is fixedly connected with the lower valve core, the upper end of the upper valve core can be in abutment with the bottom of the valve seat, and the valve seat forms the normally open sealing structure of the working port and the exhaust port, the lower valve core and the valve body form the normally closed sealing structure of the inlet and the working port.

[0007] The first sealing element is arranged between the lower valve core and the inner wall of the valve body, and the first sealing element is used to seal the inlet and the exhaust port.

[0008] The electrically-controlled pilot pressure regulating valve according to the preceding description, wherein the upper valve core and the lower valve core are in interference fit.

[0009] The electrically-controlled pilot pressure regulating valve according to the preceding description, wherein the valve body is internally provided with a first sealing portion, the top of the lower valve core is provided with a second sealing portion, and the lower valve core has a first position and a second position arranged in the up-down direction, when the lower valve core is in the first position, the second sealing portion can abut against the first sealing portion to seal the inlet port and the working port.

[0010] The electrically-controlled pilot pressure regulating valve according to the preceding description, wherein the bottom of the first sealing portion is provided with a second sealing member, when the lower valve core is in the first position, the second sealing portion can abut against the second sealing member.

[0011] The electrically-controlled pilot pressure regulating valve according to the preceding description, wherein the main valve core further comprises a valve core spring, the valve core spring is located outside the lower valve core and is used to drive the lower valve core to keep in the first position.

[0012] The electrically-controlled pilot pressure regulating valve according to the preceding description, wherein the driving member is a diaphragm, the diaphragm is located directly above the valve seat, the upper end of the valve seat is fixedly connected with the diaphragm, the bottom of the valve seat is provided with a third sealing portion, the third sealing portion is internally provided with a third sealing member, the top of the upper valve core is provided with a fourth sealing portion, the fourth sealing portion can abut against the third sealing member to seal the working port and the exhaust port.

[0013] The electrically-controlled pilot pressure regulating valve according to the preceding description, wherein the valve seat is externally provided with a valve seat spring, the valve seat spring is used to drive the valve seat to displace upward to separate the fourth sealing portion and the third sealing member.

[0014] The electrically-controlled pilot pressure regulating valve according to the preceding description, further comprising a valve plate, the valve plate is located directly above the valve body, and the bottom of the valve plate and the diaphragm jointly form a pilot cavity, the inlet port and the pilot cavity are in communication.

[0015] The electrically-controlled pilot pressure regulating valve according to the preceding description, further comprising an inlet pilot valve, an exhaust pilot valve, a control circuit board and a pressure sensor, the inlet of the inlet pilot valve is in communication with the inlet port, the outlet of the inlet pilot valve is in communication with the pilot cavity, the inlet of the exhaust pilot valve is in communication with the pilot cavity, the control circuit board is used to control the opening or closing of the inlet pilot valve and the exhaust pilot valve, and the pressure sensor is used to detect the pressure of the working port and is electrically connected with the control circuit board.

[0016] The electronically controlled pilot-operated pressure regulating valve described above also includes a drive circuit board and a display. The drive circuit board is electrically connected to both the intake pilot valve and the exhaust pilot valve to provide power to them. The display is electrically connected to the pressure sensor.

[0017] This utility model has the following beneficial effects:

[0018] 1. The upper valve core and the lower valve core are fixedly connected by an interference fit, so that there are no leakage points between them. During the displacement of the main valve core, only one dynamic sealing point needs to be maintained between the lower valve core and the inner wall of the valve body, which can greatly reduce leakage caused by wear of multiple sealing points and significantly improve the overall sealing performance. In addition, due to the interference fit between the upper valve core and the lower valve core, there is no friction between them during the up and down movement. During the air passage or exhaust process of the pilot chamber, the friction can be effectively reduced, which facilitates the operation of the pilot chamber.

[0019] 2. When the main valve core moves downward, the valve seat needs to drive the top of the upper valve core, which can maintain contact with the upper valve core to achieve sealing of the working port and the exhaust port. Since there is no relative movement between the valve seat and the upper valve core, the sealing parts between them will not wear. When the main valve core moves upward, the top of the lower valve core contacts the inner wall of the valve body, and there is only a vertical foundation. During its displacement, there is no need to wear the sealing parts. It can cooperate with the structure of the main valve core to reduce the dynamic sealing points.

[0020] 3. A pressure sensor is used in conjunction with a pilot valve to control the pressure in the pilot chamber, thereby controlling the pressure at the working port and achieving precise adjustment of the working port pressure. Attached Figure Description

[0021] Fig. 1 This is a cross-sectional view of the overall structure of the embodiment;

[0022] Fig. 2 This is a schematic diagram of the rear structure of an embodiment.

[0023] In the picture:

[0024] 1. Valve body; 11. Inlet; 12. Working port; 13. Exhaust port; 14. Second seal; 2. Main valve core; 21. Upper valve core; 22. Lower valve core; 221. First seal; 23. Valve core spring; 3. Valve seat; 31. Third seal; 32. Valve seat spring; 4. Diaphragm; 5. Valve plate; 51. Pilot chamber; 6. Exhaust pilot valve; 7. Inlet pilot valve; 71. Drive circuit board; 8. Control circuit board; 9. Pressure sensor; 10. Display. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] like Figs. 1-2 As shown, an electrically controlled pilot-operated pressure regulating valve includes a valve body 1, a main valve core 2, a valve seat 3, and a driving component. The main valve core 2 and the valve seat 3 are both located inside the valve body 1. The driving component is used to drive the main valve core 2 to move within the valve body 1 through the valve seat 3, so as to realize the switching of the overall working state of the regulating valve.

[0027] Specifically, the valve body 1 is provided with an air inlet 11, a working port 12, and an exhaust port 13. Through the movement of the main valve core 2, the working port 12 can be connected to the air inlet 11 or the exhaust port 13. When the air inlet 11 is connected to the working port 12, the air inlet 11 can provide stable gas to the working port 12, thereby maintaining a stable air pressure output from the working port 12. When the working port 12 is connected to the exhaust port 13, the pressure inside the working port 12 can be released and the gas discharged through the exhaust port 13.

[0028] The main valve core 2 includes an upper valve core 21 and a lower valve core 22. The lower end of the upper valve core 21 can be press-fitted into the lower valve core 22 and fixedly connected to it. In this embodiment, the lower end of the upper valve core 21 and the lower valve core 22 are interference-fitted, meaning there is no gap between them. Therefore, no additional sealing element is required, which can effectively reduce the number of sealing elements. At the same time, since the upper valve core 21 and the lower valve core 22 are interference-fitted, they are essentially integrated. There will be no relative displacement between them. Therefore, there is no dynamic friction between the upper valve core 21 and the lower valve core 22, and there is no dynamic sealing point, which can reduce the wear of the sealing element.

[0029] In this embodiment, the upper valve core 21 can be mechanically pressed into the lower valve core 22.

[0030] Wherein, the upper end of the upper valve core 21 can abut with the bottom of the valve seat 3, and the abutting places of both are provided with rubber surfaces, which can avoid the damage of hard contact to the structure, and also can avoid the air leakage caused by hard contact, and form the normally open sealing structure of the working port 12 and the exhaust port 13 with the valve seat 3, and the lower valve core 22 forms the normally closed sealing structure of the working port 12 and the working port 11 with the valve body 1, the normally open sealing structure refers to the sealing design that keeps open in the non-working state of the device, and the normally closed sealing structure refers to the sealing design that keeps closed in the non-working state of the device, in this embodiment, the first sealing element 221 is arranged between the lower valve core 22 and the inner wall of the valve body 1, and the first sealing element 221 is used to seal the working port 12 and the exhaust port 13, and there is no relative displacement between the upper valve core 21 and the lower valve core 22, and there is no friction between the upper valve core 21 and the lower valve core 22, and in the movement process of the main valve core 2, it only needs to rub the first sealing element 221, so compared with the regulating valve in the prior art, it greatly reduces the dynamic sealing point, can reduce the wear of the sealing element, reduce the risk of leakage, and is convenient for maintenance.

[0031] In this embodiment, the initial position of the lower valve core 22 is at the position where the top thereof abuts with the inner wall of the valve body 1, and the abutment of the top of the lower valve core 22 with the inner wall of the valve body 1 can block the working port 12 and the working port 12, and when the valve seat 3 drives the upper valve core 21 to move downward, it will drive the lower valve core 22 to move downward together, so as to make the top of the lower valve core 22 and the inner wall of the valve body 1 disengage, and then open the communication channel between the working port 11 and the working port 12, and in the process of driving the upper valve core 21 to move downward, the valve seat 3 always abuts with the top of the upper valve core 21, which can close the channel between the working port 12 and the exhaust port 13.

[0032] Wherein, the main valve core 2 is provided with a communication channel for communicating the working port 12 and the exhaust port 13, the communication channel penetrates the upper valve core 21 and the lower valve core 22, and the lower end of the communication channel directly communicates with the exhaust port 13, and the gap between the bottom of the valve seat 3 and the top of the upper valve core 21 can be used to communicate the communication channel and the working port 12 after the valve seat 3 and the upper valve core 21 are separated, so as to communicate the working port 12 and the exhaust port 13.

[0033] Specifically, the first sealing part is arranged in the valve body 1, the second sealing part is arranged on the top of the lower valve core 22, and the lower valve core 22 has a first position and a second position arranged along the up-down direction. When the lower valve core 22 is located at the first position, the second sealing part can abut against the first sealing part. The abutment is consistent with the abutment mode of the upper valve core 21 and the valve seat 3, that is, the rubber surfaces are pressed against each other, and the effect is the same. The first sealing part seals the air inlet 11 and the working port 12. When the lower valve core 22 is located at the second position, the second sealing part is separated from the first sealing part, so that the air inlet 11 can be communicated with the working port 12 to supply air to the working port 12, so that the working port 12 can output stable pressure.

[0034] The bottom of the first sealing part is provided with the second sealing part 14. When the lower valve core 22 is located at the first position, the second sealing part can abut against the second sealing part 14. The abutment is consistent with the abutment mode of the upper valve core 21 and the valve seat 3, that is, the rubber surfaces are pressed against each other, and the effect is the same. That is, the second sealing part 14 realizes the sealing between the top of the lower valve core 22 and the valve body 1, and prevents air from passing through the gap between the top of the lower valve core 22 and the valve body 1. However, since the second sealing part 14 is located between the top of the lower valve core 22 and the valve body 1, the lower valve core 22 will not rub against the second sealing part 14 during the downward movement of the lower valve core 22, which can reduce the wear of the overall sealing part.

[0035] In the embodiment, the first sealing part 221 and the second sealing part 14 can be sealing rings made of elastic materials such as rubber.

[0036] In order to realize the normally closed state of the air inlet 11 and the working port 12, the main valve core 2 further comprises a valve core spring 23. The valve core spring 23 is located outside the lower valve core 22 and is used to drive the lower valve core 22 to remain at the first position. In the embodiment, the top of the lower valve core 22 extends outward, that is, the diameter of the top of the lower valve core 22 is greater than the diameter of the lower part of the lower valve core 22. One end of the valve core spring 23 abuts against the valve body 1, and the other end of the valve core spring 23 abuts against the bottom surface of the top of the lower valve core 22. The valve core spring 23 is in a compressed state, which can provide an upward elastic force for the top of the lower valve core 22. The elastic force can keep the lower valve core 22 at the first position. When the top of the lower valve core 22 is forced, it can overcome the elastic force and move downward.

[0037] Specifically, the driving member is a diaphragm 4 located directly above the valve seat 3, the upper end of the valve seat 3 is fixedly connected with the diaphragm 4, the bottom of the valve seat 3 is provided with a third sealing portion, the third sealing portion is provided with a third sealing element 31, the top of the upper valve core 21 is provided with a fourth sealing portion, the fourth sealing portion can abut against the third sealing element 31 to seal the working port 12 and the exhaust port 13, and the valve seat 3 is driven by the diaphragm 4, the diaphragm 4 can drive the valve seat 3 to move upward or downward, when the valve seat 3 moves downward, the third sealing element 31 can abut against the fourth sealing portion, so that the working port 12 and the exhaust port 13 are sealed.

[0038] In order to realize the normally open of the working port 12 and the exhaust port 13, a valve seat spring 32 is arranged outside the valve seat 3, the valve seat spring 32 is used to drive the valve seat 3 to move upward, so that the valve seat 3 does not fall due to gravity, thereby separating the fourth sealing portion and the third sealing element 31, and keeping the working port 12 and the exhaust port 13 in communication.

[0039] In order to drive the main valve core 2, a valve plate 5 is further arranged, the valve plate 5 is located directly above the valve body 1, and the bottom of the valve plate 5 and the diaphragm 4 jointly form a pilot chamber 51, and the inlet port 11 is in communication with the pilot chamber 51, so that when the inlet port 11 is in communication with the pilot chamber 51, the gas in the inlet port 11 first enters the pilot chamber 51, the pressure in the pilot chamber 51 increases, which drives the diaphragm 4 to deform downward, the diaphragm 4 deforms downward to drive the valve seat 3 to move downward, and then drives the main valve core 2 to move downward, so as to open the gap between the inlet port 11 and the working port 12, and then the gas in the inlet port 11 enters the working port 12 to adjust the pressure in the working port 12.

[0040] In order to realize the real-time adjustment of the pressure of the working port 12, an inlet pilot valve 7, an exhaust pilot valve 6, a control circuit board 8 and a pressure sensor 9 are further arranged, the inlet of the inlet pilot valve 7 is in communication with the inlet port 11, the outlet of the inlet pilot valve 7 is in communication with the pilot chamber 51, the inlet of the exhaust pilot valve 6 is in communication with the pilot chamber 51, the control circuit board 8 is used to control the opening and closing of the inlet pilot valve 7 and the exhaust pilot valve 6, and the pressure sensor 9 is used to detect the pressure of the working port 12 and is electrically connected with the control circuit board 8, that is, the pressure sensor 9 first detects the pressure value of the working port 12 and feeds back to the control circuit board 8, if the pressure is too small, the control circuit board 8 controls the inlet pilot valve 7 to open, and the inlet port 11 supplies gas pressure to the working port 12, if the pressure is too large, the control circuit board 8 controls the exhaust pilot valve 6 to open, so that the gas in the pilot chamber 51 is exhausted, the pressure effect of the pilot chamber 51 is lost, and the working port 12 and the exhaust port 13 can be in communication, and then the pressure is released.

[0041] In the process of moving up and down, there is no relative displacement between the upper valve core 21 and the lower valve core 22, and there is no friction between the upper valve core 21 and the lower valve core 22, so that the friction can be reduced, the air intake and exhaust of the pilot cavity 51 are facilitated, and specifically, the control of the pilot valve is adjusted by small flow and high frequency air intake, but when the static friction is too large, a larger force is required to start, and once the friction is reduced, the air intake is too much, and the system is over-adjusted, so in the embodiment, after the friction is reduced, the air intake can be reasonably controlled to avoid system over-adjustment.

[0042] In order to intuitively see the pressure of the working port 12, a driving circuit board 71 and a display 10 are further included, the driving circuit board 71 is electrically connected with the air intake pilot valve 7 and the exhaust pilot valve 6 at the same time, used for providing power for the air intake pilot valve 7 and the exhaust pilot valve 6, realizing opening or closing of the air intake pilot valve 7 and the exhaust pilot valve 6, and the display 10 is electrically connected with the pressure sensor 9, the pressure sensor 9 can feed back to the display 10 in real time after acquiring the pressure signal, facilitating real-time observation of an operator.

[0043] The pressure regulating valve mentioned in the embodiment can be applied to many industries such as petroleum chemical industry and energy industry, water treatment and municipal water supply, pharmaceutical and biotechnology, automobile and mechanical manufacturing, cold chain and air conditioning system, building and fire engineering, ship and marine engineering, laboratory and scientific research equipment, food processing, semiconductor manufacturing and the like.

[0044] The technical scheme of the utility model is described in detail above in combination with the drawings, and the described embodiment is used to help understand the idea of the utility model. The specific embodiments described in the text are only examples of the spirit of the utility model. Those skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the utility model or exceed the scope defined by the appended claims.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0046] In addition, the descriptions such as "first", "second", "one" and the like in the utility model are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0047] In the utility model, unless another explicit provision and limitation, the term "connection", "fixing" and so on should do the broad sense understanding, for example, "fixing" can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's mutual action relation, unless another explicit limitation.For the ordinary skill in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific situation.

[0048] In addition, the technical solutions of various embodiments of the utility model can be combined with each other, but must be based on the ordinary skill in the art that can be realized, when the combination of technical solutions appears mutual contradiction or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not in the protection scope required by the utility model.

Claims

1. An electrically controlled pilot pressure regulating valve, comprising a valve body, a main valve core, a valve seat and a driving member, the valve body being provided with an inlet, a working port and an outlet, the main valve core and the valve seat being located in the valve body, the driving member being used to drive the main valve core to displace in the valve body through the valve seat, characterized in that the main valve core comprises an upper valve core and a lower valve core, the lower end of the upper valve core being press-fitted into the lower valve core and fixedly connected with the lower valve core, the upper end of the upper valve core being abutted with the bottom of the valve seat and forming a normally open sealing structure of the working port and the outlet with the valve seat, the lower valve core and the valve body forming a normally closed sealing structure of the inlet and the working port; a first sealing member is arranged between the lower valve core and the inner wall of the valve body, and is used to seal the inlet and the outlet. The upper valve core and the lower valve core are in interference fit. The inside of the valve body is provided with a first sealing part, the top of the lower valve core is provided with a second sealing part, and the lower valve core has a first position and a second position arranged in the up-down direction, when the lower valve core is located at the first position, the second sealing part can abut with the first sealing part to seal the inlet and the working port.

2. The electrically controlled pilot pressure regulating valve according to claim 1, characterized by The bottom of the first sealing part is provided with a second sealing member, when the lower valve core is located at the first position, the second sealing part can abut with the second sealing member.

3. The electrically controlled pilot pressure regulating valve according to claim 1, wherein The main valve core further comprises a valve core spring, the valve core spring is located outside the lower valve core and is used to drive the lower valve core to keep at the first position.

4. The electrically controlled pilot pressure regulating valve according to claim 3, characterized in that The driving member is a diaphragm, the diaphragm is located directly above the valve seat, the upper end of the valve seat is fixedly connected with the diaphragm, the bottom of the valve seat is provided with a third sealing part, the third sealing part is provided with a third sealing member, the top of the upper valve core is provided with a fourth sealing part, the fourth sealing part can abut with the third sealing member to seal the working port and the outlet.

5. The electrically controlled pilot pressure regulating valve according to claim 3, wherein The valve seat is provided with a valve seat spring, the valve seat spring is used to drive the valve seat to displace upward to separate the fourth sealing part and the third sealing member.

6. The electrically controlled pilot pressure regulating valve according to claim 1, wherein Further comprising a valve plate, the valve plate is located directly above the valve body, and the bottom of the valve plate and the diaphragm jointly form a pilot chamber, the inlet is communicated with the pilot chamber.

7. An electrically controlled pilot pressure regulating valve according to claim 6, wherein Further comprising an inlet pilot valve, an outlet pilot valve, a control circuit board and a pressure sensor, the inlet of the inlet pilot valve is communicated with the inlet, the outlet of the inlet pilot valve is communicated with the pilot chamber, the inlet of the outlet pilot valve is communicated with the pilot chamber, the control circuit board is used to control the opening or closing of the inlet pilot valve and the outlet pilot valve, and the pressure sensor is used to detect the pressure of the working port and is electrically connected with the control circuit board.

8. The electrically controlled pilot pressure regulating valve according to claim 6, wherein Further comprising a driving circuit board and a display, the driving circuit board is electrically connected with the inlet pilot valve and the outlet pilot valve at the same time, and is used to provide power for the inlet pilot valve and the outlet pilot valve, and the display is electrically connected with the pressure sensor.

9. The electrically controlled pilot pressure regulating valve according to claim 8, wherein ​ 10. The electrically controlled pilot pressure regulating valve according to claim 9, wherein ​

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