A dual-purpose positive and negative pressure reversing valve with pressure holding function

Abstract

This application relates to the field of directional valve technology, and more specifically to a dual-purpose positive and negative pressure directional valve with pressure holding function, comprising: a valve body assembly, a valve stem, two pistons, two sets of coil frames and an iron core, and a first spring. The valve body assembly has a first air inlet, a second air inlet, a flow channel, an air outlet, two sliding chambers, two piston chambers, two external air chambers, two external air channels, and a third air inlet. The flow channel is connected to the first air inlet, the second air inlet, the air outlet, and the two sliding chambers respectively. Each sliding chamber is connected to a piston chamber, and its other end is connected to the external air chamber. The external air channel is connected to the external air chamber and the third air inlet. The valve stem is slidably disposed between the two sliding chambers and the flow channel. A piston is slidably disposed in the piston chamber. The iron core is slidably disposed on the coil frame. The iron core seals the connection between the external air chamber and the external air channel. This invention achieves the advantage of isolating the two air inlets and the air outlet in the power-off state by setting the first spring and the third air inlet.

Description

Technical Field

[0001] This application relates to the field of directional valve technology, and more specifically to a dual-purpose positive and negative pressure directional valve with pressure holding function. Background Technology

[0002] A directional control valve is a valve with two or more flow patterns and two or more ports.

[0003] There is a two-inlet, one-outlet directional control valve 9, such as Figure 1 As shown, the system includes a pump body 90, a valve stem 91, and two pistons 92. The pump body 90 has two air inlets 901, one air outlet 902, a connecting cavity 903, two piston cavities 904, and two pneumatic inlets 905. Both pneumatic inlets 905 are connected to an external air source device (not shown in the figure). The valve stem 91 is slidably disposed in the connecting cavity 903, and both ends of the valve stem 91 extend into the two piston cavities 904 by a predetermined distance. A blocking ring is provided on the valve stem 91. Gas is introduced into one of the pneumatic inlets 905 through the external air source device. When gas flows into one of the pneumatic inlets 905, the corresponding piston 92 moves towards the valve stem 91 under the action of air pressure, pushing the valve stem 91 to move in the corresponding direction, and at a certain moment blocking the connection between one of the air inlets 901 and the connecting cavity 903, so that only one air inlet 901 and one air outlet 902 are connected at the same time. However: In the case of... Figure 2 In this application scenario, assuming two gases need to be filled into bottle 93, after each gas is filled to a predetermined pressure, it needs to stand for a predetermined time before the other gas is filled. Figure 1 When the two inlet-one-outlet reversing valve 9 shown does not allow gas to flow into either of the two pneumatic inlets 905 to push the piston 92, since one of the inlets 901 is still connected to the outlet 902, that is, the external air source can still flow along the inlet 901 to the outlet 902 and fill the bottle 93. Therefore, it is impossible to achieve the isolation of the external air source from the bottle 93 and stabilize the air pressure in the bottle 93 by stopping the external air source device of the two inlet-one-outlet reversing valve 9 after the air pressure in the bottle 93 reaches a certain value.

[0004] Therefore, there is a need for a dual-purpose positive and negative pressure reversing valve with a leak-proof seal and pressure-holding function that isolates the two air inlets and outlets in the power-off state, allows the air source pressure at the air inlets and outlets to be either positive or negative, and provides a pressure-holding function. Summary of the Invention

[0005] The main objective of this application is to provide a dual-purpose positive and negative pressure directional valve with a pressure-holding function. The dual-purpose positive and negative pressure directional valve includes a valve body assembly, a valve stem, two pistons, two electromagnetic assemblies, and a first spring. The valve body assembly has a first air inlet, a second air inlet, a flow channel, an air outlet, two sliding chambers, two piston chambers, two external air chambers, two external air channels, and a third air inlet. One side of the flow channel is connected to both the first and second air inlets, and the other side of the flow channel is connected to the air outlet. The two ends of the flow channel are respectively connected to the two sliding cavities. Each sliding cavity has a piston cavity at one end away from the flow channel, and the other end of each piston cavity is connected to the corresponding external air cavity. One end of each external air channel is connected to the corresponding external air cavity, and the other end of each external air channel is connected to the third air inlet. The valve stem is slidably passed through the two sliding cavities and the flow channel, and both ends of the valve stem extend into the two piston cavities by a predetermined distance. The valve stem divides the flow channel into a first air inlet cavity, a second air inlet cavity, and an intermediate cavity. The first air inlet is connected to the first air inlet cavity, the second air inlet is connected to the second air inlet cavity, the intermediate cavity is located between the first air inlet cavity and the second air inlet cavity, and the air outlet is connected to the intermediate cavity. A piston is slidably disposed in each piston cavity. Each electromagnetic component includes a coil frame and an iron core. The iron core is slidably disposed on the coil frame, and a coil is wound on the coil frame. Each external air cavity and the external air channel are connected to a third air inlet cavity. The iron core seals the connection between the external air chamber and the external air channel. When the coil is energized, the external air chamber and the external air channel are connected. One end of the first spring is connected to the valve body, and the other end of the first spring abuts against the valve stem. When the first spring is in an undeformed state, the valve stem simultaneously blocks the connection between the first air inlet chamber, the second air inlet chamber, and the intermediate chamber. Compared with the prior art, this application has the advantages of isolating the two air inlets and outlets in the power-off state and allowing the air source pressure at the air inlet and outlet to be positive or negative.

[0006] Another objective of this application is to provide a dual-purpose positive and negative pressure reversing valve with pressure holding function. The valve further includes a sealing plate, which is rotatably mounted on the valve body assembly and positioned at the connection between the air outlet and the intermediate cavity. One end of the sealing plate extending into the intermediate cavity has a half-gear portion, and one side wall of the valve stem has a rack portion. The half-gear portion meshes with the rack portion. When the valve stem moves axially along the sliding cavity, the sealing plate rotates by a predetermined angle and opens the connection between the air outlet and the intermediate cavity. When the first spring is in an undeformed state, the sealing plate closes the connection between the air outlet and the intermediate cavity. By providing the sealing plate, even when the sealing ring wears, it can selectively close the air outlet following the valve stem.

[0007] Another objective of this application is to provide a dual-purpose positive and negative pressure reversing valve with a pressure-holding function, wherein the rack portion has an anti-over-rotation portion at both ends. When one end face of the valve stem abuts against a piston, and the other end of the piston abuts against the piston cavity opposite to the end face of the valve stem, the anti-over-rotation portion abuts against the edge of the sealing plate. At the same time, the meshing teeth at one end of the rack portion abut against the meshing teeth at one end of the half gear portion. By providing the anti-over-rotation portion, the sealing plate is prevented from swinging back and forth due to the fluid.

[0008] To achieve at least one of the above-mentioned objectives, this application provides a dual-purpose positive and negative pressure directional valve with a pressure-holding function, wherein the dual-purpose positive and negative pressure directional valve with a pressure-holding function includes:

[0009] A valve body assembly includes a first air inlet, a second air inlet, a flow channel, an air outlet, two sliding chambers, two piston chambers, two external air chambers, two external air passages, and a third air inlet. One side of the flow channel is connected to the first air inlet and the second air inlet, respectively, and the other side of the flow channel is connected to the air outlet. Both ends of the flow channel are connected to the two sliding chambers, respectively. Each sliding chamber has a piston chamber at its end opposite to the flow channel, and the other end of each piston chamber is connected to the corresponding external air chamber. One end of each external air passage is connected to the corresponding external air chamber, and the other end of each external air passage is connected to the third air inlet.

[0010] A valve stem is slidably passed through two sliding chambers and the flow channel, with both ends of the valve stem extending into the two piston chambers by a predetermined distance. The valve stem divides the flow channel into a first intake chamber, a second intake chamber, and an intermediate chamber. The first intake port communicates with the first intake chamber, the second intake port communicates with the second intake chamber, the intermediate chamber is located between the first intake chamber and the second intake chamber, and the outlet port communicates with the intermediate chamber.

[0011] Two pistons, each piston chamber having one piston slidably disposed therein; and

[0012] Two electromagnetic components, each comprising a coil frame and an iron core, the iron core being slidably mounted on the coil frame, a coil wound on the coil frame, and each connection point between the external air cavity and the external air channel abutting against an iron core, thus sealing the connection point. When the coil is energized, the external air cavity connects to the external air channel; and

[0013] A first spring is provided, one end of which is connected to the valve body, and the other end of which abuts against the valve stem. When the first spring is in an undeformed state, the valve stem simultaneously blocks the communication between the first air intake chamber, the second air intake chamber, and the intermediate chamber.

[0014] In one or more embodiments of this application, the dual-purpose positive and negative pressure reversing valve with pressure holding function further includes a sealing plate. The sealing plate is rotatably mounted on the valve body assembly and located at the communication between the air outlet and the intermediate cavity. One end of the sealing plate extending into the intermediate cavity has a half-gear portion, and one side wall of the valve stem has a rack portion. The half-gear portion meshes with the rack portion. When the valve stem moves axially along the sliding cavity, the sealing plate rotates by a predetermined angle and opens the communication between the air outlet and the intermediate cavity. When the first spring is in an undeformed state, the sealing plate closes the communication between the air outlet and the intermediate cavity.

[0015] In one or more embodiments of this application, the rack portion further has an anti-over-rotation portion at both ends. When one end face of the valve stem abuts against a piston, and the other end of the piston abuts against the piston cavity away from the end face of the valve stem, the anti-over-rotation portion abuts against the edge of the sealing plate. At the same time, the teeth at one end of the rack portion abut against the teeth at one end of the half gear portion.

[0016] In one or more embodiments of this application, the valve body assembly has a shoulder assembly, which includes a first shoulder, a second shoulder, a third shoulder, and a fourth shoulder. The first shoulder is located at the connection between the first air intake chamber and a sliding chamber, the second shoulder is located at the connection between the first air intake chamber and an intermediate chamber, the third shoulder is located at the connection between the second air intake chamber and the intermediate chamber, and the fourth shoulder is located at the connection between the second air intake chamber and another sliding chamber. The valve stem has a plurality of annular grooves, and a sealing ring is fitted on each annular groove. At least one sealing ring is attached to the first shoulder, the second shoulder, the third shoulder, and the fourth shoulder.

[0017] In one or more embodiments of this application, one side of the valve stem has a first flow channel, a second flow channel, two transmission channels, and two sets of connecting holes arranged in an annular array. The first flow channel is connected to the first air intake chamber, and the second flow channel is connected to the second air intake chamber. One end of each transmission channel is connected to a corresponding set of connecting holes, and the other end of each transmission channel is connected to either the first flow channel or the second flow channel. One end of one set of connecting holes is connected to an annular groove that is normally opposite the second shoulder, and one end of the other set of connecting holes is connected to an annular groove that is normally opposite the third shoulder.

[0018] In one or more embodiments of this application, the valve stem includes an intermediate component and two extension components. The two ends of the intermediate component are respectively connected to the two extension components. The intermediate component is slidably disposed in the flow channel. The two extension components are respectively slidably disposed in the corresponding sliding cavity and extend into the corresponding piston cavity by a predetermined distance. The intermediate component is designed as a split part along the central axis and then welded together.

[0019] In one or more embodiments of this application, the valve body assembly includes a first valve body, a second valve body, two third valve bodies, and two fourth valve bodies. One end of the first valve body is connected to a second valve body, and the opposite ends of the first and second valve bodies are each connected to a third valve body. The other end of each third valve body is connected to a fourth valve body. The first air inlet, the second air inlet, the flow channel, the air outlet, and the sliding cavity are all disposed on the first valve body. Each second valve body has a receiving cavity for placing the first spring. Each third valve body has a piston cavity and an external air cavity. Each fourth valve body is provided with an electromagnetic component.

[0020] In this invention, the dual-purpose positive and negative pressure reversing valve with pressure holding function includes a valve body assembly, a valve stem, two pistons, two sets of coil frames and iron cores, and a first spring. The valve body assembly has a first air inlet, a second air inlet, a flow channel, an air outlet, two sliding chambers, two piston chambers, two external air chambers, two external air channels, and a third air inlet. The flow channel is connected to the first air inlet, the second air inlet, the air outlet, and the two sliding chambers, respectively. Each sliding chamber is connected to a piston chamber, and its other end is connected to an external air chamber. The external air channels are connected to the external air chambers and the third air inlet. The valve stem is slidably disposed in two sliding chambers and a flow channel. A piston is slidably disposed in the piston chamber. The iron core is slidably disposed on the coil frame. The iron core seals the connection between the external air chamber and the external air channel. When the coil is energized, the external air chamber is connected to the external air channel. The two ends of the first spring are combined with the valve body and abut against the valve stem. When the first spring is in an undeformed state, the valve stem simultaneously blocks the connection between the first air inlet, the second air inlet and the air outlet. Compared with the prior art, this application has the advantages of isolating the two air inlets and the air outlet in the power-off state, and the air source pressure at the air inlet and the air outlet can be positive or negative pressure. Attached Figure Description

[0021] These and / or other aspects and advantages of this application will become clearer and more readily understood from the following detailed description of embodiments of this application taken in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 The diagram illustrates the structure of a conventional two-inlet, one-outlet reversing valve.

[0023] Figure 2 The diagram illustrates a conventional two-inlet-one-outlet reversing valve mounted on a filling bottle.

[0024] Figure 3 The figure shows a cross-sectional view of a dual-purpose positive and negative pressure reversing valve with pressure holding function according to this application;

[0025] Figure 4 The figure shows a structural schematic diagram of a dual-purpose positive and negative pressure reversing valve with pressure holding function according to this application;

[0026] Figure 5 The diagram shows Figure 3 A magnified view of a portion at point C;

[0027] Figure 6 The diagram shows Figure 3 A magnified view of a portion at point D;

[0028] Figure 7 The diagram shows Figure 3 A magnified view of a portion at point E;

[0029] Figure 8 The diagram illustrates the position of the sealing plate when the valve stem moves to its limit position.

[0030] Figure 9 The diagram illustrates the oscillation of the sealing plate under the action of fluid when the valve stem moves to its limit position;

[0031] Figure 10 The diagram illustrates the structure of the sealing plate when the present application is equipped with an anti-rotation section. Detailed Implementation

[0032] The terms and words used in the following specification and claims are not limited to their literal meaning, but are used solely by the inventors to enable a clear and consistent understanding of this application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of this application is provided for illustrative purposes only and not for the purpose of limiting the application as defined in the appended claims and their equivalents.

[0033] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0034] While ordinal numbers such as "first," "second," etc., will be used to describe various components, this does not limit which components are used. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the teachings of the inventive concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will also be understood that the terms “comprising” and / or “having” as used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0036] This is an illustration of a dual-purpose directional valve with pressure holding function, suitable for both positive and negative pressure applications.

[0037] refer to Figures 3 to 10 According to a preferred embodiment of the present invention, a dual-purpose positive and negative pressure reversing valve with pressure holding function includes a valve body assembly 10, a valve stem 20, two pistons 30, two electromagnetic components 40 and a first spring 50.

[0038] Specifically, such as Figures 3 to 7As shown, the valve body assembly 10 has a first air inlet 101, a second air inlet 102, a flow channel 103, an air outlet 104, two sliding chambers 105, two piston chambers 106, two external air chambers 107, two external air channels 108, and a third air inlet 109. One side of the flow channel 103 is connected to the first air inlet 101 and the second air inlet 102, respectively, and the other side of the flow channel 103 is connected to the air outlet 104. Both ends of the flow channel 103 are connected to the two sliding chambers 105, and one end of each sliding chamber 105 away from the flow channel 103 is connected to a piston chamber 106. The other end of each piston chamber 106 is connected to the corresponding external air chamber 107. One end of each external air channel 108 is connected to the corresponding external air chamber 107, and the other end of each external air channel 108 is connected to the third air inlet 109.

[0039] In addition, such as Figure 5 and Figure 6 As shown, the valve stem 20 is slidably passed through the two sliding chambers 105 and the flow channel 103, and both ends of the valve stem 20 extend into the two piston chambers 106 by a predetermined distance. The valve stem 20 divides the flow channel 103 into a first air inlet chamber 1031, a second air inlet chamber 1032 and an intermediate chamber 1033. The first air inlet 101 communicates with the first air inlet chamber 1031, the second air inlet 102 communicates with the second air inlet chamber 1032, the intermediate chamber 1033 is located between the first air inlet chamber 1031 and the second air inlet chamber 1032, and the air outlet 104 communicates with the intermediate chamber 1033.

[0040] In addition, such as Figure 5 As shown, a piston 30 is slidably disposed in each of the piston chambers 106.

[0041] In addition, such as Figure 3 and Figure 5 As shown, each of the electromagnetic components 40 includes a coil frame 401 and an iron core 402. The iron core 402 is slidably disposed on the coil frame 401. A coil 403 is wound on the coil frame 401. Each external air cavity 107 and external air channel 108 has an iron core 402 at the connection point, which closes the connection point between the external air cavity 107 and the external air channel 108. When the coil 403 is energized, the external air cavity 107 and the external air channel 108 are connected.

[0042] In addition, such as Figure 7As shown, one end of the first spring 50 is connected to the valve body assembly 10, and the other end of the first spring 50 abuts against the valve stem 20. When the first spring 50 is in an undeformed state, the valve stem 20 simultaneously blocks the communication between the first air intake chamber 1031, the second air intake chamber 1032 and the intermediate chamber 1033.

[0043] It should be noted that when both coils 403 of the two electromagnetic components 40 are de-energized, under the elastic force of the first spring 50, the valve stem 20 normally closes the connection between the first air inlet chamber 1031 and the intermediate chamber 1033, as well as the connection between the second air inlet chamber 1032 and the intermediate chamber 1033. This achieves the isolation of the first air inlet 101, the second air inlet 102, and the air outlet 104 when the electromagnetic components 40 are de-energized. Assuming that the air outlet 104 is connected to the external gas cylinder, when the gas pressure in the external gas cylinder reaches a predetermined pressure value, both electromagnetic components 40 can be de-energized. Then, the valve stem 20 will automatically reset to the initial state under the elastic force of the first spring 50, and the first air inlet 101 and the second air inlet 102 can no longer fill the external gas cylinder with gas. Compared with the prior art, this has the advantages of isolating the two air inlets and outlets and stabilizing the pressure in the power-off state.

[0044] It should also be noted that when the dual-purpose positive and negative pressure reversing valve with pressure-holding function is working, only one of the electromagnetic components 40 is energized at a time. When the coil 403 of one of the electromagnetic components 40 is energized, the corresponding iron core 402 moves away from the external air passage 108 and no longer blocks the connection between the external air passage 108 and the external air chamber 107. Furthermore, the third air inlet 109 is filled with positive pressure gas. Simultaneously, when the iron core 402 moves away from the external air passage 108, the space of the external air chamber 107 increases and the air pressure decreases. Therefore, the positive pressure gas flows into the external air chamber 107 along the external air passage 108 and along the connection between the external air chamber 107 and the piston chamber 106. The connecting hole exerts a thrust on the piston 30 in the piston chamber 106, causing the piston 30 to approach the valve stem 20. At a certain moment, the piston 30 contacts the valve stem 20, and as the piston 30 moves further, it drives the valve stem 20 to move axially towards the other electromagnetic component 40, causing the valve stem 20 to close the connection between the first air intake chamber 1031 or the second air intake chamber 1032 and the intermediate chamber 1033. At the same time, it opens the connection between the second air intake chamber 1032 or the first air intake chamber 1031 and the intermediate chamber 1033, so that when the coil 403 of the electromagnetic component 40 is energized, the corresponding first air intake port 101 or the second air intake port 102 connects with the air outlet 104.

[0045] It should also be noted that since pushing the valve stem 20 requires a certain force, the piston 30 will be difficult to push when the gas pressure in the piston chamber 106 is negative. However, this application achieves a separate design of the third air inlet 109 from the first air inlet 101 and the second air inlet 102 in the flow channel, so that the first air inlet 101, the second air inlet 102 and the air outlet 104 can all be under negative pressure. Compared with the prior art, it has a wider range of applications and has the advantage that the air source pressure at the air inlet and the air outlet can be positive or negative.

[0046] Furthermore, to achieve a seal between the valve stem 20 and the valve body assembly 10, such as... Figure 6 As shown, the valve body assembly 10 has a shoulder assembly 60, which includes a first shoulder 601, a second shoulder 602, a third shoulder 603, and a fourth shoulder 604. The first shoulder 601 is located at the connection between the first air intake chamber 1031 and a sliding chamber 105. The second shoulder 602 is located at the connection between the first air intake chamber 1031 and an intermediate chamber 1033. The third shoulder 603 is located at the connection between the second air intake chamber 1032 and the intermediate chamber 1033. The fourth shoulder 604 is located at the connection between the second air intake chamber 1032 and another sliding chamber 105. The valve stem 20 has a plurality of annular grooves 201, and a sealing ring 202 is fitted on each annular groove 201. At least one sealing ring 202 is attached to the first shoulder 601, the second shoulder 602, the third shoulder 603, and the fourth shoulder 604.

[0047] However, when the sealing ring 202 at the second shoulder 602 or the third shoulder 603 is worn, it will cause the first air inlet 101 or the second air inlet 102 to be connected to the intermediate cavity 1033 and the air outlet 104 when both electromagnetic components 40 are de-energized. In this case, the pressure holding function of the positive and negative pressure dual-purpose reversing valve with pressure holding function fails, and the air pressure in the bottle body connected to the air outlet 104 cannot be stabilized.

[0048] Therefore, in the embodiments of this application, as Figure 6As shown, the dual-purpose positive and negative pressure reversing valve with pressure-holding function also includes a sealing plate 70. The sealing plate 70 is rotatably mounted on the valve body assembly 10 and located at the communication point between the air outlet 104 and the intermediate cavity 1033. One end of the sealing plate 70 extending into the intermediate cavity 1033 has a half-gear portion 701. One side wall of the valve stem 20 has a rack portion 203. The half-gear portion 701 meshes with the rack portion 203. When the valve stem 20 moves axially along the sliding cavity 105, the sealing plate 70 rotates by a predetermined angle and opens the communication point between the air outlet 104 and the intermediate cavity 1033. When the first spring 50 is in an undeformed state, the sealing plate 70 closes the communication point between the air outlet 104 and the intermediate cavity 1033.

[0049] It should be noted that, since the half-gear portion 701 and the rack portion 203 are engaged, when the half-gear portion 701 and the rack portion 203 are not disengaged, the angle of the sealing plate 70 is actually determined by the rack portion 203. Since the rack portion 203 is fixedly connected to the valve stem 20, the positional movement of the valve stem 20 actually determines the angle of the sealing plate 70. When the first spring 50 is in an undeformed state, both the first air inlet 101 and the second air inlet 102 are blocked from the intermediate cavity 1033, and the sealing plate 70 is arranged horizontally and closes the air outlet 104. When the valve stem 20 moves along the axis to a limit position and connects the first air inlet 101 or the second air inlet 102 with the intermediate cavity 1033, the sealing plate 70 is in a nearly vertical inclined state and opens the connection between the air outlet 104 and the intermediate cavity 1033. When both electromagnetic components 40 are de-energized, the valve stem 20 simultaneously blocks the first air inlet 101 and the second air inlet 102 from the intermediate cavity 1033. Simultaneously, the sealing plate 70 seals the connection between the air outlet 104 and the intermediate cavity 1033. Even if the sealing ring 202 at the second shoulder 602 or the third shoulder 603 normally wears and leaks, the gas inside the bottle connected to the air outlet 104 is blocked by the sealing plate 70 and cannot communicate with the first air inlet 101 or the second air inlet 1033. The valve stem 20, with its interchangeable ports 102, offers the advantage of a leak-proof seal compared to existing technologies. It is evident that one function of the valve stem 20 is to move towards another electromagnetic component 40 when the corresponding electromagnetic component 40 is energized, thus connecting the first air inlet 101 or the second air inlet 102 with the air outlet 104. When both electromagnetic components 40 are de-energized, both the first air inlet 101 and the second air inlet 102 are disconnected from the air outlet 104. Its second function is to allow the sealing plate 70 to selectively seal the connection between the intermediate cavity 1033 and the air outlet 104.

[0050] Further, refer to Figure 8 When the valve stem 20 moves, connecting the first air inlet 101 with the intermediate cavity 1033, and simultaneously blocking the second air inlet 102 from the intermediate cavity 1033, the sealing plate 70, under the meshing action of the half-gear portion 701 and the rack portion 203, forms... Figure 8 At the angle, however, when external air flows into the intermediate cavity 1033 along the first air inlet 101 and towards the air outlet 104, the external air source will exert a force on the sealing plate 70, causing it to... Figures 8 to 9 It swings back and forth within the angle range and makes abnormal noises, and aggravates the wear at the sealing plate 70.

[0051] Therefore, in the embodiments of this application, as Figure 10 As shown, the rack portion 203 also has an anti-over-rotation portion 2031 at both ends. When one end face of the valve stem 20 abuts against a piston 30, and the other end of the piston 30 abuts against the piston cavity 106 away from the end face of the valve stem 20, the anti-over-rotation portion 2031 abuts against the edge of the sealing plate 70. At the same time, the teeth at one end of the rack portion 203 abut against the teeth at one end of the half gear portion 701.

[0052] It should be noted that by setting the anti-over-rotation part 2031, when the valve stem 20 moves to its limit position, the sealing plate 70 abuts against the anti-over-rotation part 2031, restricting the sealing plate 70 from moving along... Figure 10 The clockwise swing is limited by the meshing teeth of the rack portion 203, making it difficult for the closed piece 70 to move along the clockwise direction. Figure 10 The counterclockwise rotation avoids the aforementioned technical problems.

[0053] Furthermore, to prevent the valve stem 20 from rotating during axial movement, such as... Figure 7 As shown, one end of the valve stem 20 has two guide grooves 204, and the valve body assembly 10 has two extension ends 605. Each guide groove 204 has an extension end 605 extending into it. The side wall of the extension end 605 is in contact with the two side walls of the guide groove 204. By setting the extension end 605, the valve stem 20 is restricted from circumferential rotation, which causes the half gear part 701 and the rack part 203 to disengage.

[0054] Furthermore, such as Figure 6As shown, one side of the valve stem 20 has a first flow channel 205, a second flow channel 206, two transmission channels 207, and two sets of connecting holes 208 arranged in a ring array. The first flow channel 205 is connected to the first air intake chamber 1031, and the second flow channel 206 is connected to the second air intake chamber 1032. One end of each transmission channel 207 is connected to a corresponding set of connecting holes 208, and the other end of each transmission channel 207 is connected to either the first flow channel 205 or the second flow channel 206. One end of one set of connecting holes 208 is connected to an annular groove 201 that is normally opposite the second shoulder 602, and one end of the other set of connecting holes 208 is connected to an annular groove 201 that is normally opposite the third shoulder 603.

[0055] It should be noted that, since the first flow channel 205 is normally connected to the first air inlet 101, and the second flow channel 206 is normally connected to the second air inlet 102, when both the first air inlet 101 and the second air inlet 102 are isolated from the intermediate cavity 1033, the gas in the first air inlet 101 and the second air inlet 102 will flow into the first flow channel 205 and the second flow channel 206, and flow into the corresponding connecting hole 208 along the corresponding transmission channel 207, and apply a force to the sealing ring 202 that is in close contact with the second shoulder 602 and the third shoulder 603, making the sealing ring 202 more... It fits against the second shoulder 602 and the third shoulder 603; in addition, when the outer ring surface of the sealing ring 202 wears down to a predetermined size, the compression deformation of the sealing ring 202 decreases when it abuts against the second shoulder 602 or the third shoulder 603, and the gap between the sealing ring 202 and the bottom wall of the annular groove 201 increases. At this time, the gas flowing into the space between the bottom wall of the annular groove 201 and the inner ring of the sealing ring 202 from the connecting hole 208 will exert a force on the sealing ring 202, and make its outer ring surface fit tightly against the second shoulder 602 or the third shoulder 603, thus extending the actual service life of the sealing ring 202.

[0056] Furthermore, to facilitate the processing of the first flow channel 205, the second flow channel 206, the transfer channel 207, and the connecting hole 208, as follows: Figure 6As shown, the valve stem 20 includes an intermediate part 2091 and two extension parts 2092. The two ends of the intermediate part 2091 are respectively connected to the two extension parts 2092 by welding. The intermediate part 2091 is slidably disposed in the flow channel 103. The two extension parts 2092 are respectively slidably disposed in the corresponding sliding cavity 105 and extend into the corresponding piston cavity 106 by a predetermined distance. The intermediate part 2091 is designed as a split part along the central axis and then welded together, that is, after the first flow channel 205, the second flow channel 206 and the transmission channel 207 are processed, they are welded together.

[0057] Furthermore, in the embodiments of this application, such as Figure 3 and Figure 4 As shown, the valve body assembly 10 includes a first valve body 606, a second valve body 607, two third valve bodies 608, and two fourth valve bodies 609. One end of the first valve body 606 is connected to a second valve body 607. The opposite ends of the first valve body 606 and the second valve body 607 are each connected to a third valve body 608. The other end of each third valve body 608 is connected to a fourth valve body 609. The first air inlet 101, the second air inlet 102, the flow channel 103, the air outlet 104, and the sliding cavity 105 are all disposed on the first valve body 606. (Refer to...) Figure 7 Each of the second valve bodies 607 has a receiving cavity 6071 for placing the first spring 50, each of the third valve bodies 608 has a piston cavity 106 and an external air cavity 107, and each of the fourth valve bodies 609 is provided with an electromagnetic component 40.

[0058] In summary, the dual-purpose positive and negative pressure reversing valve with pressure holding function described in the embodiments of this application is explained. It provides the advantages of isolating the two air inlets and outlets in the power-off state, and the air source pressure at the air inlet and outlet can be positive or negative, with a leak-proof seal.

[0059] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from these principles.

Claims

1. A dual-purpose positive and negative pressure reversing valve with pressure holding function, characterized in that: The dual-purpose positive and negative pressure reversing valve with pressure holding function includes: A valve body assembly includes a first air inlet, a second air inlet, a flow channel, an air outlet, two sliding chambers, two piston chambers, two external air chambers, two external air passages, and a third air inlet. One side of the flow channel is connected to the first air inlet and the second air inlet, respectively, and the other side of the flow channel is connected to the air outlet. Both ends of the flow channel are connected to the two sliding chambers, respectively. Each sliding chamber has a piston chamber at its end opposite to the flow channel, and the other end of each piston chamber is connected to the corresponding external air chamber. One end of each external air passage is connected to the corresponding external air chamber, and the other end of each external air passage is connected to the third air inlet. A valve stem is slidably passed through two sliding chambers and the flow channel, with both ends of the valve stem extending into the two piston chambers by a predetermined distance. The valve stem divides the flow channel into a first intake chamber, a second intake chamber, and an intermediate chamber. The first intake port communicates with the first intake chamber, the second intake port communicates with the second intake chamber, the intermediate chamber is located between the first intake chamber and the second intake chamber, and the outlet port communicates with the intermediate chamber. Two pistons, each piston chamber having one piston slidably disposed therein; and Two electromagnetic components, each comprising a coil frame and an iron core, the iron core being slidably mounted on the coil frame, a coil wound on the coil frame, and each connection point between the external air cavity and the external air channel abutting against an iron core, thus sealing the connection point. When the coil is energized, the external air cavity connects to the external air channel; and A first spring, one end of which is connected to the valve body, and the other end of which abuts against the valve stem. When the first spring is in an undeformed state, the valve stem simultaneously blocks the communication between the first air intake chamber, the second air intake chamber, and the intermediate chamber; and A sealing plate is rotatably mounted on the valve body assembly and positioned at the connection between the air outlet and the intermediate cavity. One end of the sealing plate extending into the intermediate cavity has a semi-gear portion, and one side wall of the valve stem has a rack portion. The semi-gear portion meshes with the rack portion. When the valve stem moves axially along the sliding cavity, the sealing plate rotates by a predetermined angle and opens the connection between the air outlet and the intermediate cavity. When the first spring is in an undeformed state, the sealing plate closes the connection between the air outlet and the intermediate cavity. The rack portion also has an anti-over-rotation portion at both ends. When one end face of the valve stem abuts against a piston, and the other end of the piston abuts against the piston cavity away from the end face of the valve stem, the anti-over-rotation portion abuts against the edge of the sealing plate. At the same time, the meshing teeth at one end of the rack portion abut against the meshing teeth at one end of the half gear portion.

2. The dual-purpose positive and negative pressure reversing valve with pressure holding function according to claim 1, characterized in that: The valve body assembly has a shoulder assembly, which includes a first shoulder, a second shoulder, a third shoulder, and a fourth shoulder. The first shoulder is located at the connection between the first air intake chamber and a sliding chamber. The second shoulder is located at the connection between the first air intake chamber and an intermediate chamber. The third shoulder is located at the connection between the second air intake chamber and the intermediate chamber. The fourth shoulder is located at the connection between the second air intake chamber and another sliding chamber. The valve stem has a plurality of annular grooves, and a sealing ring is fitted on each annular groove. At least one sealing ring is attached to the first shoulder, the second shoulder, the third shoulder, and the fourth shoulder.

3. The dual-purpose positive and negative pressure reversing valve with pressure holding function according to claim 2, characterized in that: The valve stem has a first flow channel, a second flow channel, two transmission channels, and two sets of connecting holes arranged in a ring array on one side. The first flow channel is connected to the first air intake chamber, and the second flow channel is connected to the second air intake chamber. One end of each transmission channel is connected to a corresponding set of connecting holes, and the other end of each transmission channel is connected to either the first flow channel or the second flow channel. One end of one set of connecting holes is connected to an annular groove that is normally opposite the second shoulder, and one end of the other set of connecting holes is connected to an annular groove that is normally opposite the third shoulder.

4. The dual-purpose positive and negative pressure reversing valve with pressure holding function according to claim 3, characterized in that: The valve stem includes an intermediate component and two extension components. The two ends of the intermediate component are respectively connected to the two extension components. The intermediate component is slidably disposed in the flow channel. The two extension components are respectively slidably disposed in the corresponding sliding cavity and extend into the corresponding piston cavity by a predetermined distance. The intermediate component is designed as a split part along the central axis and then welded together.

5. The dual-purpose positive and negative pressure reversing valve with pressure holding function according to any one of claims 1-4, characterized in that: The valve body assembly includes a first valve body, a second valve body, two third valve bodies, and two fourth valve bodies. One end of the first valve body is connected to a second valve body. The opposite ends of the first and second valve bodies are each connected to a third valve body. The other end of each third valve body is connected to a fourth valve body. The first air inlet, the second air inlet, the flow channel, the air outlet, and the sliding cavity are all located on the first valve body. Each second valve body has a receiving cavity for placing the first spring. Each third valve body has a piston cavity and an external air cavity. Each fourth valve body is provided with an electromagnetic component.

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