Electrical proportional valve

Abstract

This application discloses an electro-proportional valve, comprising a valve body with a valve cavity and a diaphragm cavity. One end of the valve cavity has an air inlet connected to it, and the other end has an air outlet connected to it. The valve body is equipped with a pressure reducing valve, a control solenoid valve, and an exhaust valve. The valve body also has air passages, including a first air passage, a second air passage, a third air passage, a fourth air passage, and a fifth air passage. The first air passage connects the air inlet to the pressure reducing valve; the second air passage connects the pressure reducing valve to the control solenoid valve; the third air passage connects the control solenoid valve to the diaphragm cavity; the fourth air passage connects the diaphragm cavity to the exhaust valve; and the fifth air passage connects the exhaust valve to the outside environment. This application optimizes the air pipe layout within the electro-proportional valve.

Description

Technical Field

[0001] This application relates to the field of proportional valve technology, and in particular to an electro-proportional valve. Background Technology

[0002] After adding a pressure reducing valve, a control solenoid valve, and an exhaust valve to an electro-proportional valve, numerous air passages are created on the valve body. To rationally plan the layout of these air passages and the positions of the valve components, it is necessary to avoid the limitations imposed by the original valve chamber and diaphragm chamber. Simultaneously, the strength of the valve body and the simplicity of the air passage paths must be considered. Therefore, for electro-proportional valves, there is considerable room for optimization in the layout of the valve components and air passages. Utility Model Content

[0003] This application proposes an electro-proportional valve designed to optimize the air pipe layout within the electro-proportional valve.

[0004] Specifically, this electro-proportional valve avoids the intersection of the first and second air passages, and the third and fourth air passages, by staggering the first and second air passages and the third and fourth air passages. This allows the first and second air passages to be located on both sides of the pressure reducing valve, and the third and fourth air passages to be located on both sides of the diaphragm cavity. This ensures that even if the user miscalculates the distance or drilling depth during drilling, it will not affect the normal operation of either air passage or the valve. This gives the electro-proportional valve excellent tolerance. In addition, the air passages, which are not arranged on the same plane, maintain the strength of the original plane and ensure the rigidity of the overall structure of the valve body. This results in an excellent air passage layout for the electro-proportional valve.

[0005] The electro-proportional valve provided in this application adopts the following technical solution:

[0006] An electro-proportional valve includes a valve body with a valve cavity and a diaphragm cavity. One end of the valve cavity has an air inlet connected to it, and the other end has an air outlet connected to it. The valve body is equipped with a pressure reducing valve, a control solenoid valve, and an exhaust valve. The valve body also has air passages, including a first air passage, a second air passage, a third air passage, a fourth air passage, and a fifth air passage. The first air passage connects the air inlet to the pressure reducing valve; the second air passage connects the pressure reducing valve to the control solenoid valve; the third air passage connects the control solenoid valve to the diaphragm cavity; the fourth air passage connects the diaphragm cavity to the exhaust valve; and the fifth air passage connects the exhaust valve to the outside environment. The control solenoid valve and the exhaust valve are symmetrically arranged, and the pressure reducing valve is located close to the control solenoid valve. The first and second air passages are parallel to each other but not on the same plane, and are located on opposite sides of the pressure reducing valve. The third and fourth air passages are parallel to each other but not on the same plane, and are located on opposite sides of the diaphragm cavity.

[0007] By adopting the above technical solution, when gas is input into the valve body, the gas enters from the inlet. At this time, part of the gas gathers in the valve cavity, waiting for the channel from the valve cavity to the outlet to open. The other part of the gas enters the diaphragm cavity through the first, second, and third air passages in sequence. The gas entering the diaphragm cavity pushes the diaphragm in the diaphragm cavity to move downward. The diaphragm drives the valve stem to move downward, thereby opening the channel from the inlet to the outlet, allowing the gas gathered in the valve cavity to be discharged through the outlet. After this process, the regulated gas in the diaphragm cavity is discharged from the exhaust valve through the fourth and fifth air passages. By opening the first and second air passages on both sides of the pressure reducing valve, and their planes are parallel but not on the same plane, with one end of each connected to the pressure reducing valve, the staggered opening method effectively avoids the phenomenon that the airflow direction in the first and second air passages is affected by the user's miscalculation of distance or drilling depth during drilling. Similarly, the third and fourth air passages are located on both sides of the membrane cavity. This layout not only facilitates the opening of these two air passages, but also maintains the strength of the original plane by using air passages that are not arranged on the same plane, ensuring the rigidity of the overall structure of the valve body, thus making the layout of the air passages on the valve body more reasonable and superior.

[0008] Preferably, the valve body has a sensing cavity, and the sensing cavity is equipped with a pressure sensor. The air passage also includes a sixth air passage, which connects the air outlet and the sensing cavity.

[0009] By adopting the above technical solution, part of the gas at the outlet can enter the sensing cavity where the pressure sensor is located through the sixth air passage. In this way, the pressure sensor can measure the pressure at the outlet by detecting the pressure in the sixth air passage. By feeding back the outlet pressure data, it is easier to adjust the flow rate of the inlet and outlet.

[0010] Preferably, the control solenoid valve and the exhaust valve are symmetrically arranged on the upper end of the valve body, the control solenoid valve is located near the air inlet, a display screen assembly is provided on one side of the upper end of the valve body, and the sensing cavity is located on the upper end of the valve body and away from the display screen assembly.

[0011] By adopting the above technical solution, the control solenoid valve, exhaust valve, air pressure sensor, and display screen assembly are integrated on the upper side of the valve body. This makes the overall structure of the electro-proportional valve more compact, with each component occupying one side of the valve body. As a result, the air passages in the electro-proportional valve are arranged from top to bottom, then from top to bottom again, and finally from bottom to top. This arrangement makes the opening of the air passages within the electro-proportional valve simpler, and the distribution of the air passages within the electro-proportional valve is also more uniform.

[0012] Preferably, the control solenoid valve and the exhaust valve are symmetrically arranged at the upper end of the valve body, the control solenoid valve is located near the air inlet, the pressure reducing valve is located near the control solenoid valve, and the pressure reducing valve is located on one side of the valve body, while the sensing chamber is located on the side of the valve body away from the pressure reducing valve.

[0013] By adopting the above technical solution, the arrangement of each component is more reasonable and orderly. The control solenoid valve is close to the air inlet, and the pressure reducing valve is close to the control solenoid valve. This shortens the length of the first air passage, the second air passage, and the third air passage, making the structure simpler. At the same time, the sensing cavity is far away from the pressure reducing valve. In this way, while the pressure reducing valve is set close to the air inlet, the sensing cavity can be set close to the air outlet. Furthermore, a large distance is formed between the sixth air passage and the first air passage. As a result, when the valve body is occupied by the valve cavity and the diaphragm cavity, the possibility of mutual interference between the first air passage and the sixth air passage is greatly reduced.

[0014] Preferably, the sixth airway is parallel to the plane of the first airway but not on the same plane, and the shape of the sixth airway is approximately a mirror image of the first airway.

[0015] By adopting the above technical solution, since the sixth air passage is set as an approximate mirror image of the first air passage, the sixth air passage and the first air passage are located on opposite sides of the valve body. This makes the overall air passage opening of the valve body more uniform, thereby ensuring the strength of the valve body. Moreover, the planes where the sixth air passage and the first air passage are located are parallel but not on the same plane. This non-plane air passage arrangement can maintain the strength of the original plane, ensure the rigidity of the overall structure of the valve body, and thus optimize the layout of the air passages on the valve body.

[0016] Preferably, the valve body includes a main valve body and a pilot valve body, the valve cavity is located in the main valve body, the diaphragm cavity includes an upper diaphragm cavity and a lower diaphragm cavity, the upper diaphragm cavity is opened at one end of the pilot valve body near the main valve body, the lower diaphragm cavity is opened at one end of the main valve body near the pilot valve body, and a diaphragm groove for installing a diaphragm is provided in the lower diaphragm cavity.

[0017] By adopting the above technical solution, the valve body is divided into two parts, which not only facilitates the installation and disassembly of the diaphragm, but also facilitates the opening of air passages on the main valve body and the pilot valve body, reducing the situation where the air passages must be opened from the outer wall of the valve body, thereby improving the effective utilization rate after the air passages are opened.

[0018] Preferably, the pilot valve body has a sealing groove on the air passage at one end near the main valve body, and a sealing element is provided in the sealing groove.

[0019] By adopting the above technical solution, the air passages opened on the pilot valve body and the main valve body can be sealed together.

[0020] Preferably, the air passage is composed of countersunk holes formed on the main valve body and the pilot valve body, and steel balls are provided in the countersunk holes on the outer wall of the main valve body and the outer wall of the pilot valve body.

[0021] By adopting the above technical solution, the air passage is formed by combining countersunk holes, making the opening of the air passage more convenient. The steel ball can not only seal the countersunk holes that make up the air passage, so that the air passage forms a sealed passage, but also can be used as a safety valve. When the pressure exceeds the set value, the steel ball can be pushed open to release pressure.

[0022] Preferably, the pressure reducing valve includes a valve core assembly and a valve sleeve assembly, the valve core assembly abutting against the valve sleeve assembly, the end of the valve core assembly near the valve sleeve assembly being tapered, the end of the valve sleeve assembly near the valve core assembly being a stepped groove, and the valve sleeve assembly having a vent hole at one end of the stepped groove, the vent hole being arranged perpendicular to the line connecting the first air passage and the second air passage.

[0023] By adopting the above technical solution, the gas in the first air passage compresses the valve core assembly by squeezing the conical valve core assembly, thereby opening the passage between the first air passage and the second air passage. Similarly, the gas located in the valve sleeve assembly comes out from the valve sleeve assembly through the vent hole, so that the airflow can not only squeeze the valve core assembly to open the passage, but also continuously flow out through the stepped groove and the vent hole and enter the second air passage.

[0024] Preferably, the end of the first air passage near the pressure reducing valve corresponds to one end of the stepped groove, and the end of the second air passage near the pressure reducing valve corresponds to the other end of the stepped groove.

[0025] By adopting the above technical solution, the first airway and the second airway are staggered, which facilitates the airflow from the vent to enter the second airway.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. When gas is input into the valve body, it enters through the inlet. At this time, some gas accumulates in the valve cavity, waiting for the passage from the valve cavity to the outlet to open. The other part of the gas enters the diaphragm cavity through the first, second, and third air passages in sequence. The gas entering the diaphragm cavity pushes the diaphragm inside the cavity downward, and the diaphragm drives the valve stem downward, thereby opening the passage from the inlet to the outlet, allowing the gas accumulated in the valve cavity to be discharged through the outlet. After this process, the regulated gas in the diaphragm cavity is discharged from the exhaust valve through the fourth and fifth air passages. By opening the first and second air passages on both sides of the pressure reducing valve, and their planes are parallel but not on the same plane, with one end of each connected to the pressure reducing valve, the staggered opening method effectively avoids the phenomenon that the airflow direction in the first and second air passages is affected by the user's miscalculation of distance or drilling depth during drilling. Similarly, the third and fourth air passages are located on both sides of the membrane cavity. This layout not only facilitates the opening of these two air passages, but also maintains the strength of the original plane by using air passages that are not arranged on the same plane, ensuring the rigidity of the overall structure of the valve body, thus making the layout of the air passages on the valve body more reasonable and superior.

[0028] 2. The control solenoid valve is located near the air inlet, and the pressure reducing valve is located near the control solenoid valve. This shortens the length of the first, second, and third air passages, making the structure simpler. At the same time, the sensing cavity is located far away from the pressure reducing valve. In this way, while the pressure reducing valve is located near the air inlet, the sensing cavity can be located near the air outlet. Furthermore, a large gap is formed between the sixth air passage and the first air passage. As a result, when the valve body is occupied by the valve cavity and the diaphragm cavity, the possibility of mutual interference between the first and sixth air passages is greatly reduced.

[0029] 3. Since the sixth air passage is set almost like a mirror image of the first air passage, the sixth air passage and the first air passage are located on the two sides of the valve body respectively. This makes the opening of the air passages in the valve body more uniform, thus ensuring the strength of the valve body. Moreover, the planes where the sixth air passage and the first air passage are located are parallel but not on the same plane. This non-plane air passage arrangement can maintain the strength of the original plane, ensure the rigidity of the overall structure of the valve body, and thus optimize the layout of the air passages on the valve body.

[0030] 4. The gas in the first air passage compresses the valve core assembly by squeezing the conical valve core assembly, thereby opening the passage between the first air passage and the second air passage. Similarly, the gas in the valve sleeve assembly comes out of the valve sleeve assembly through the vent hole, so that the airflow can not only squeeze the valve core assembly to open the passage, but also flow continuously out through the stepped groove and the vent hole and enter the second air passage; and the first air passage and the second air passage are staggered to facilitate the airflow from the vent hole to enter the second air passage. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the electro-proportional valve in this embodiment;

[0032] Figure 2 This is a schematic diagram of the electro-proportional valve without its cover in this embodiment;

[0033] Figure 3 This is a rear view of the electro-proportional valve in this embodiment;

[0034] Figure 4 for Figure 3 Along the sectional view shown in AA;

[0035] Figure 5 This is a front view of the electro-proportional valve in this embodiment;

[0036] Figure 6 for Figure 5 Along the sectional view shown in BB;

[0037] Figure 7 for Figure 5 Along the sectional view shown in CC;

[0038] Figure 8 This is a right view of the electro-proportional valve in this embodiment;

[0039] Figure 9 for Figure 8 Along the sectional view shown in DD;

[0040] Figure 10 for Figure 8 Along the sectional view shown in EE;

[0041] Figure 11 This is a left view of the electro-proportional valve in this embodiment;

[0042] Figure 12 for Figure 11 Along the sectional view shown in FF;

[0043] Figure 13 for Figure 11 Along the cross-sectional view shown in GG.

[0044] Reference numerals: 1. Valve body; 11. Main valve body; 12. Pilot valve body; 13. Valve chamber; 14. Diaphragm chamber; 141. Upper diaphragm chamber; 142. Lower diaphragm chamber; 15. Sensing chamber; 16. Air inlet; 17. Air outlet; 18. Sealing groove; 19. Steel ball; 2. Air passage; 21. First air passage; 211. First channel; 212. Second channel; 213. Third channel; 124. Fourth channel; 22. Second air passage; 221. Fifth channel; 222. Sixth channel; 23. Third air passage; 231. Seventh channel; 232. Eighth channel; 233. Ninth channel; 234. 10th channel; 24. Fourth air channel; 241. Eleventh channel; 242. Twelfth channel; 243. Thirteenth channel; 244. Fourteenth channel; 25. Fifth air channel; 251. Fifteenth channel; 252. Sixteenth channel; 26. Sixth air channel; 261. Seventeenth channel; 262. Eighteenth channel; 263. Nineteenth channel; 264. Twentieth channel; 265. Twenty-first channel; 3. Pressure reducing valve; 31. Valve core assembly; 32. Valve sleeve assembly; 321. Step groove; 322. Vent hole; 4. Control solenoid valve; 5. Exhaust valve; 6. Air pressure sensor. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-13 This application will be described in further detail.

[0046] This application discloses an electro-proportional valve.

[0047] Reference Figure 1 and Figure 2 The system includes a valve body 1, which includes a main valve body 11 and a pilot valve body 12. The lower end of the pilot valve body 12 is connected to the upper end of the main valve body 11 by a sealing bolt. A valve chamber 13 is provided in the middle of the main valve body 11 in the axial direction. One end of the valve chamber 13 is provided with an air inlet 16 and the other end is provided with an air outlet 17. A lower diaphragm chamber 142 is provided in the axial direction at the upper end of the main valve body 11. A diaphragm groove for installing a diaphragm is provided on the upper side of the lower diaphragm chamber 142. An upper diaphragm chamber 141 is provided at the lower end of the pilot valve body 12. The upper diaphragm chamber 141 and the lower diaphragm chamber 142 together form a complete diaphragm chamber 14.

[0048] The upper end of the pilot valve body 12 is fixed with a control solenoid valve 4 and an exhaust valve 5 by bolts. The control solenoid valve 4 and the exhaust valve 5 are symmetrically arranged, so that when the air inlet 16 on the valve body 1 is located at the right end and the air outlet 17 is located at the left end, the control solenoid valve 4 is located at the upper right position of the pilot valve body 12, and the exhaust valve 5 is located at the upper left position of the pilot valve body 12. The pilot valve body 12 is also provided with a pressure reducing valve 3 channel. The pressure reducing valve 3 is connected to the pressure reducing valve 3 channel by bolts. In order to avoid the diaphragm cavity 14 in the axial direction of the valve body 1, the pressure reducing valve 3 channel is located at the upper right end and rear of the pilot valve body 12. A cover is fitted on the pilot valve body 12, and the cover covers the solenoid valve and the exhaust valve 5.

[0049] The valve body 1 has an air passage 2. The air passage 2 is formed by the combination of countersunk holes on the main valve body 11 and the pilot valve body 12. The air passage 2 is sealed by the countersunk holes through the steel ball 19. The steel ball 19 not only makes the air passage 2 a sealed passage, but also can be used as a safety valve. When the pressure exceeds the set value, the steel ball 19 can be pushed open to release the pressure. The air passage 2 includes a first air passage 21, a second air passage 22, a third air passage 23, a fourth air passage 24 and a fifth air passage 25. The first air passage 21 connects the air inlet 16 and the pressure reducing valve 3. The second air passage 22 connects the pressure reducing valve 3 and the control solenoid valve 4. The third air passage 23 connects the control solenoid valve 4 and the upper diaphragm chamber 141. The fourth air passage 24 connects the upper diaphragm chamber 141 and the exhaust valve 5. The fifth air passage 25 connects the exhaust valve 5 and the outside.

[0050] refer to Figure 3 and Figure 4 The first air passage 21 includes a first channel 211, a second channel 212, a third channel 213, and a fourth channel 124. The first channel 211 extends forward from the rear side of the main valve body 11 until one end of the first channel 211 connects to the air inlet 16. The second channel 212 extends from the upper end of the main valve body 11 and connects to the first channel 211, and is located near the rear side of the main valve body 11. The third channel 213 extends upward from the lower end of the pilot valve body 12, and... The opening position of the first air passage 211 is connected to the opening position of the second channel 212. The fourth channel 124 is opened from the rear end of the pilot valve body 12, so that the fourth channel 124 is connected to the channel of the pressure reducing valve 3. The reason for using the horizontal "door" shaped first air passage 21 is that the air inlet 16 is located in the middle of the right end of the valve body 1, while the pressure reducing valve 3 is located at the rear of the right end of the valve body 1. Therefore, the countersunk hole on the valve body 1 is opened in the way of the smallest countersunk hole path, so that the first air passage 21 is opened at the end close to the pressure reducing valve 3, that is, the rear end of the valve body 1 is more appropriate.

[0051] refer to Figure 5 and Figure 6The second air passage 22 includes a fifth channel 221 and a sixth channel 222. The fifth channel 221 opens from the front end of the pilot valve body 12 backward until it connects with the pressure reducing valve 3. The sixth channel 222 opens from the upper end of the pilot valve body 12 until it connects with the fifth channel 221. Since the pressure reducing valve 3 needs to control the connection and blockage between the first air passage 21 and the second air passage 22, it is more appropriate to set the fifth channel 221 of the second air passage 22 and the fourth channel 124 of the first air passage 21 on both sides of the pressure reducing valve 3. Since the control solenoid valve 4 is located at the upper end of the pilot valve body 12, the sixth channel 222 opens upward. The planes of the first air passage 21 and the second air passage 22 are parallel but not on the same plane. The first air passage 21 and the second air passage 22 are located on both sides of the pressure reducing valve 3.

[0052] refer to Figure 8 and Figure 9 The third airway 23 includes a seventh channel 231, an eighth channel 232, a ninth channel 233, and a tenth channel 234. The seventh channel 231 extends downward from the upper end of the pilot valve body 12. The eighth channel 232 extends left from the right end of the pilot valve body 12, intersecting and connecting with the seventh channel 231. The ninth channel 233 extends upward from the lower end of the pilot valve body 12, connecting with the eighth channel 232. The tenth channel 234 extends left from the right end of the pilot valve body 12 until it connects with the upper diaphragm chamber 141. The tenth channel 234 is located below the eighth channel 232. Since the diaphragm chamber 14 is located in the middle of the lower end of the pilot valve body 12, it connects with the upper diaphragm chamber 14. The third air passage 23 is located in the middle of the pilot valve body 12. Since the pilot valve body 12 also has a first air passage 21 and a second air passage 22, the third air passage 23 is located between the first air passage 21 and the second air passage 22. The third air passage 23 also needs to avoid the fifth channel 221 of the second air passage 22. Therefore, the eighth channel 232 and the ninth channel 233 are needed to bend the path of the third air passage 23. The first air passage 21 occupies the middle and rear part of the pilot valve body 12 in a mirror "C" shape. The third air passage 23 occupies the middle and slightly forward part of the pilot valve body 12. The second air passage 22 occupies the front middle part of the pilot valve body 12. Thus, the first air passage 21, the second air passage 22 and the third air passage 23 are intersected and evenly distributed on the right side of the valve body 1.

[0053] refer to Figure 11 and Figure 12The fourth air passage 24 includes an eleventh passage 241, a twelfth passage 242, a thirteenth passage 243, and a fourteenth passage 244. The shape of the fourth air passage 24 is similar to that of the third air passage 23. The eleventh passage 241 extends downward from the upper end of the pilot valve body 12. The twelfth passage 242 extends to the right from the left end of the pilot valve body 12, such that the twelfth passage 242 intersects and connects with the eleventh passage 241. The thirteenth passage 243 extends upward from the lower end of the pilot valve body 12, such that the thirteenth passage 244... 3 is connected to the twelfth channel 242. The fourteenth channel 244 opens from the left end of the pilot valve body 12 to the right until the fourteenth channel 244 is connected to the upper membrane cavity 141. The fourteenth channel 244 is located below the twelfth channel 242. The fourth air passage 24 and the third air passage 23 are not on the same plane. The plane where the fourth air passage 24 is located is behind the plane where the third air passage 23 is located. That is, the fourth air passage 24 is located in the middle of the left side of the valve body 1. The third air passage 23 and the fourth air passage 24 are located on both sides of the membrane cavity 14.

[0054] refer to Figure 8 and Figure 9 The fifth air passage 25 includes a fifteenth channel 251 and a sixteenth channel 252. The fifteenth channel 251 is opened from the upper end of the pilot valve body 12 downwards, and the sixteenth channel 252 is opened from the left end of the pilot valve body 12 to the right, so that the sixteenth channel 252 is connected to the fifteenth channel 251. The fifth air passage 25 and the third air passage 23 are located on the same plane.

[0055] When gas is introduced into valve body 1, it enters through inlet 16. At this time, some gas accumulates in valve chamber 13, waiting for the passage from valve chamber 13 to outlet 17 to open. The other part of the gas enters diaphragm chamber 14 through first passage 21, second passage 22, and third passage 23 in sequence. The gas entering diaphragm chamber 14 pushes the diaphragm inside diaphragm chamber 14 downward, and the diaphragm drives the valve stem downward, thereby opening the passage from inlet 16 to outlet 17, allowing the gas accumulated in valve chamber 13 to pass through outlet 17. After this process, the regulated gas in the membrane cavity 14 is discharged through the fourth air passage 24 and the fifth air passage 25, and finally discharged from the exhaust valve 5. By opening the first air passage 21 and the second air passage 22 on both sides of the pressure reducing valve 3, and the planes on which they are located are parallel but not on the same plane, and one end of both is connected to the pressure reducing valve 3, the staggered opening method effectively avoids the phenomenon that the airflow direction in the first air passage 21 and the second air passage 22 is affected by the user's miscalculation of distance or drilling depth during drilling. Similarly, the third air passage 23 and the fourth air passage 24 are located on both sides of the diaphragm cavity 14. This layout not only facilitates the opening of these two air passages 2, but also maintains the strength of the original plane by using air passages 2 arranged on different planes, ensuring the rigidity of the overall structure of the valve body 1. This makes the layout of the air passages 2 on the valve body 1 more reasonable and superior. Furthermore, by dividing the valve body 1 into two parts, it is not only convenient for the installation and disassembly of the diaphragm, but also convenient for opening air passages 2 on the main valve body 11 and the pilot valve body 12, reducing the situation where air passages 2 must be opened from the outer wall of the valve body 1, thereby improving the effective utilization rate of the air passages 2 after they are opened.

[0056] Furthermore, in this embodiment, reference is made to... Figure 7 and Figure 13 A sensing cavity 15 is provided at the front of the upper end of the valve body 1. A pressure sensor 6 is fixed in the sensing cavity 15 by bolts. A sixth air passage 26 is provided on the sensing cavity 15, which connects the air outlet 17 and the sensing cavity 15. The sixth air passage 26 includes a seventeenth channel 261, an eighteenth channel 262, a nineteenth channel 263, a twentieth channel 264, and a twenty-first channel 265. The seventeenth channel 261 extends from the front end of the main valve body 11 to the rear, stopping at the point where it connects with the air outlet 17. The eighteenth channel 262 opens downward from the upper end of the main valve body 11 until it connects with the seventeenth channel 261. The nineteenth channel 263 opens upward from the lower end of the pilot valve body 12, so that the position of the nineteenth channel 263 corresponds to and connects with the position of the eighteenth channel 262. One end of the twentieth channel 264 opens backward from the front end of the main valve body 11 until it connects with the nineteenth channel 263. The twenty-first channel 265 opens to the left from the right end of the main valve body 11 until it connects with the sensing cavity 15.

[0057] The fourth air passage 24 on the left side of the valve body 1 is located in the middle and slightly forward of the left side of the valve body 1. The fifth air passage 25 is located in front of the fourth air passage 24. The sixth air passage 26 occupies the front left side of the valve body 1, so that the front left side of the valve body 1 is maximized. The fourth air passage 24, the fifth air passage 25 and the sixth air passage 26 are evenly distributed and do not interfere with each other.

[0058] Furthermore, the plane containing the seventeenth channel 261, the eighteenth channel 262, the nineteenth channel 263, and the twentieth channel 264 of the sixth air passage 26 is parallel to the plane containing the first air passage 21 but not on the same plane. The sixth air passage 26 and the first air passage 21 are approximately mirror images of each other. The sixth air passage 26 is located at the front of the valve body 1, and the first air passage 21 is located at the rear of the valve body 1. The two are approximately diagonally arranged.

[0059] This allows some gas from the outlet 17 to enter the sensing cavity 15 where the pressure sensor 6 is located through the sixth air passage 26. In this way, the pressure sensor 6 can measure the pressure of the outlet 17 by detecting the pressure in the sixth air passage 26. By feeding back the pressure data of the outlet 17, it is easier to adjust the flow rate of the inlet 16 and the outlet 17. Since the sixth air passage 26 is set almost like a mirror image of the first air passage 21, the sixth air passage 26 and the first air passage 21 are located on opposite sides of the valve body 1. This makes the opening of the air passages 2 in the valve body 1 more uniform, thereby ensuring the strength of the valve body 1. Moreover, the planes where the sixth air passage 26 and the first air passage 21 are located are parallel but not on the same plane. This arrangement of the air passages 2 on different planes can maintain the strength of the original plane, ensure the rigidity of the overall structure of the valve body 1, and thus optimize the layout of the air passages 2 on the valve body 1.

[0060] Furthermore, in this embodiment, the control solenoid valve 4 and the exhaust valve 5 are symmetrically connected to the upper end of the valve body 1 by bolts. The control solenoid valve 4 is located near the air inlet 16. The display screen assembly is fixed to the rear side of the upper end of the valve body 1 by bolts. The sensing cavity 15 is located on the front side of the upper end of the valve body 1. The arrangement of each component is more reasonable and orderly. The control solenoid valve 4 is close to the air inlet 16, and the pressure reducing valve 3 is close to the control solenoid valve 4. This shortens the length of the first air passage 21, the second air passage 22, and the third air passage 23, making the structure simpler. At the same time, the sensing cavity 15 is far away from the pressure reducing valve 3. In this way, while the pressure reducing valve 3 is located near the air inlet 16, the sensing cavity 15 can be located near the air outlet 17. Furthermore, a large gap is formed between the sixth air passage 26 and the first air passage 21. As a result, when the valve cavity 13 and the diaphragm cavity 14 occupy a certain space in the valve body 1, the possibility of mutual interference between the first air passage 21 and the sixth air passage 26 is greatly reduced.

[0061] Furthermore, in this embodiment, reference is made to... Figure 10The pressure reducing valve 3 includes a valve core assembly 31 and a valve sleeve assembly 32. The valve core assembly 31 is retractably connected to the inner end of the pressure reducing valve 3 cavity, and the valve sleeve assembly 32 is retractably connected to the other end of the pressure reducing valve 3. The valve core assembly 31 and the valve sleeve assembly 32 abut against each other. The end of the valve core assembly 31 near the valve sleeve assembly 32 is tapered, and the end of the valve sleeve assembly 32 near the valve core assembly 31 is a stepped groove 321. The valve sleeve assembly 32 has a vent hole 322 vertically opened at one end of the stepped groove 321. The vent hole 322 is perpendicular to the fourth channel 124 of the first air passage 21 and the fifth channel 221 of the second air passage 22. The first air passage 21, near the pressure reducing valve 3, corresponds to one end of the stepped groove 321, and the second air passage 22, near the pressure reducing valve 3, corresponds to the other end of the stepped groove 321. This allows the gas in the first air passage 21 to compress the valve core assembly 31 by squeezing the conical valve core assembly 31, thereby opening the passage between the first air passage 21 and the second air passage 22. Similarly, the gas in the valve sleeve assembly 32 exits from the valve sleeve assembly 32 through the vent 322. This allows the airflow to not only squeeze the valve core assembly 31 to open the passage, but also to continuously flow out through the stepped groove 321 and the vent 322 and enter the second air passage 22. Furthermore, the first air passage 21 and the second air passage 22 are staggered to facilitate the airflow from the vent 322 entering the second air passage 22.

[0062] Furthermore, in this embodiment, the pilot valve body 12 has a sealing groove 18 at the end of the third channel 213 and the end of the nineteenth channel 263. A sealing element is placed in the sealing groove 18 so that the air passage 2 opened on the pilot valve body 12 and the main valve body 11 can be sealed together.

[0063] In this embodiment, the existing technology structures used in the proportional valve, such as the valve stem, are not specifically described. These valve-related structures that are not specifically described adopt common technical solutions in the existing technology and will not be elaborated here.

[0064] It should be noted that the various embodiments of this application can be arbitrarily combined into new embodiments, provided that the solutions do not conflict and the technical solutions can coexist.

[0065] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electro-proportional valve, characterized in that: The valve includes a valve body (1), on which a valve chamber (13) and a diaphragm chamber (14) are provided. One end of the valve chamber (13) is provided with an air inlet (16) and the other end is provided with an air outlet (17). The valve body (1) is provided with a pressure reducing valve (3), a control solenoid valve (4) and an exhaust valve (5). The valve body (1) is provided with an air passage (2), which includes a first air passage (21), a second air passage (22), a third air passage (23) and a fourth air passage (24). The first air passage (21) connects the air inlet (16) to the pressure reducing valve (3), the second air passage (22) connects the pressure reducing valve (3) to the control solenoid valve (4), the third air passage (23) connects the control solenoid valve (4) to the diaphragm cavity (14), the fourth air passage (24) connects the diaphragm cavity (14) to the exhaust valve (5), and the fifth air passage (25) connects the exhaust valve (5) to the outside. The control solenoid valve (4) and the exhaust valve (5) are symmetrically arranged. The pressure reducing valve (3) is arranged close to the control solenoid valve (4). The first air passage (21) and the second air passage (22) are parallel to each other but not on the same plane. The first air passage (21) and the second air passage (22) are located on both sides of the pressure reducing valve (3). The third air passage (23) and the fourth air passage (24) are parallel to each other but not on the same plane. The third air passage (23) and the fourth air passage (24) are located on both sides of the membrane cavity (14).

2. The electro-proportional valve according to claim 1, characterized in that: The valve body (1) is provided with a sensing cavity (15), and a pressure sensor (6) is provided in the sensing cavity (15). The air passage (2) also includes a sixth air passage (26), which connects the air outlet (17) and the sensing cavity (15).

3. The electro-proportional valve according to claim 2, characterized in that: The control solenoid valve (4) and the exhaust valve (5) are symmetrically arranged at the upper end of the valve body (1). The control solenoid valve (4) is located near the air inlet (16). A display screen assembly is provided on one side of the upper end of the valve body (1). The sensing cavity (15) is located on the upper end of the valve body (1) and on the side away from the display screen assembly.

4. The electro-proportional valve according to claim 2, characterized in that: The control solenoid valve (4) and the exhaust valve (5) are symmetrically arranged at the upper end of the valve body (1). The control solenoid valve (4) is located near the air inlet (16), and the pressure reducing valve (3) is located near the control solenoid valve (4). The pressure reducing valve (3) is located on one side of the valve body (1), and the sensing cavity (15) is located on the side of the valve body (1) away from the pressure reducing valve (3).

5. The electro-proportional valve according to claim 4, characterized in that: The sixth airway (26) is parallel to the plane of the first airway (21) but not on the same plane, and the shape of the sixth airway (26) is approximately a mirror image of the first airway (21).

6. The electro-proportional valve according to claim 1, characterized in that: The valve body (1) includes a main valve body (11) and a pilot valve body (12). The valve cavity (13) is located inside the main valve body (11). The diaphragm cavity (14) includes an upper diaphragm cavity (141) and a lower diaphragm cavity (142). The upper diaphragm cavity (141) is opened at one end of the pilot valve body (12) near the main valve body (11). The lower diaphragm cavity (142) is opened at one end of the main valve body (11) near the pilot valve body (12). A diaphragm groove for installing a diaphragm is provided in the lower diaphragm cavity (142).

7. The electro-proportional valve according to claim 6, characterized in that: The pilot valve body (12) has a sealing groove (18) on the air passage (2) at one end near the main valve body (11), and a sealing element is provided in the sealing groove (18).

8. The electro-proportional valve according to claim 6, characterized in that: The air passage (2) is composed of countersunk holes formed on the main valve body (11) and the pilot valve body (12), and steel balls (19) are provided in the countersunk holes on the outer wall of the main valve body (11) and the outer wall of the pilot valve body (12).

9. The electro-proportional valve according to claim 1, characterized in that: The pressure reducing valve (3) includes a valve core assembly (31) and a valve sleeve assembly (32). The valve core assembly (31) abuts against the valve sleeve assembly (32). The end of the valve core assembly (31) near the valve sleeve assembly (32) is tapered. The end of the valve sleeve assembly (32) near the valve core assembly (31) is a stepped groove (321). The valve sleeve assembly (32) has a vent hole (322) at one end of the stepped groove (321). The vent hole (322) is arranged perpendicular to the line connecting the first air passage (21) and the second air passage (22).

10. The electro-proportional valve according to claim 9, characterized in that: The first air passage (21) is located near the pressure reducing valve (3) at one end and corresponds to one end of the stepped groove (321), and the second air passage (22) is located near the pressure reducing valve (3) at one end and corresponds to the other end of the stepped groove (321).

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