Valve cover and electromagnetic pulse valve comprising same

Abstract

The utility model discloses a valve cover and contain its electromagnetic pulse valve, the valve cover includes valve cover body, the upper surface of valve cover body has the exhaust pipe outside, the exhaust pipe is used for discharging the air of valve cover chamber of electromagnetic pulse valve, the bottom of exhaust pipe with valve cover chamber is linked together, and the top of exhaust pipe constructs and has the exhaust outlet, to export the compressed air in valve cover chamber. Through separating exhaust pipe and valve cover body, the exhaust pipe is external on valve cover body, thus, the section area of exhaust passage increases, and the angle of exhaust passage is reduced, and the exhaust resistance is reduced, can effectively promote the output pressure rising rate of electromagnetic pulse valve.

Description

Technical Field

[0001] This utility model relates to the field of bag filter technology, and in particular to a valve cover and an electromagnetic pulse valve containing the same. Background Technology

[0002] The electromagnetic pulse valve is a core component of the dust collector's cleaning system, and its performance directly determines the dust collector's operating efficiency. Its main function is to be instantly activated by an electromagnetic pulse jet controller (or PLC), injecting compressed air into the filter bag. Through the venturi effect, several times the volume of surrounding air is drawn into the filter bag, creating an instantaneous positive pressure inside. This causes the filter bag to expand and vibrate, and a reverse airflow to scour it, thus efficiently removing dust adhering to the filter bag's surface.

[0003] like Figure 1 As shown, the electromagnetic pulse valve includes three chambers: a first chamber 1, a second chamber 2 (i.e., the valve cover chamber), and a third chamber 3. The first chamber 1 and the second chamber 2 are connected by a first damping hole 4, and the second chamber 2 and the third chamber 3 are connected by a second damping hole 5. In this way, the pressure in the three chambers is the same.

[0004] like Figure 1 , 2 As shown, the remote electromagnetic pulse jet controller sends an electrical signal to coil 12, which generates an electromagnetic field 13, attracting the moving column 6 to move upward, thus discharging the compressed air from the third chamber 3. The pressure inside the third chamber 3 decreases. When the pressure inside the second chamber 2 is higher than the pressure inside the third chamber 3, the universal diaphragm 7 between the third chamber 3 and the second chamber 2 opens, releasing the compressed air from the exhaust port 8. Similarly, when the pressure inside the second chamber 2 decreases, and the pressure inside the first chamber 1 is higher than the pressure inside the second chamber 2, the large diaphragm 10 between the first chamber 1 and the second chamber 2 opens, releasing the compressed air from the first chamber 1. The compressed air in the first chamber 1 is discharged from the valve outlet 11 and injected into the filter bag, completing one jet cycle of the electromagnetic pulse valve. During the jet cycle, a pressure-time curve is formed at the valve outlet 11, as shown in the figure. Figure 3 As shown.

[0005] The output pressure rise rate can be obtained from the pressure-time curve above. The output pressure rise rate refers to the ratio of the peak pressure at valve outlet 11 to the time required for the pressure to rise from 0 to the peak pressure during pulse valve injection, expressed in kilopascals per millisecond (kPa / ms). That is: Output pressure rise rate = Peak pressure (kPa) / Peak pressure rise time (ms). The output pressure rise rate plays a crucial role in filter bag cleaning; to increase the filtration area of ​​a single electromagnetic pulse valve, the output pressure rise rate must be increased.

[0006] The aforementioned prior art has at least the following technical problem: the output pressure rise rate of the electromagnetic pulse valve in the prior art is relatively low. Summary of the Invention

[0007] This application provides a valve cover and an electromagnetic pulse valve containing the same, which solves the technical problem of low output pressure rise rate of electromagnetic pulse valves in the prior art. To solve the above-mentioned technical problems, in a first aspect, embodiments of this application provide a valve cover for an electromagnetic pulse valve. The valve cover includes a valve cover body, and an exhaust pipe is externally connected to the upper surface of the valve cover body. The exhaust pipe is used to discharge air from the valve cover chamber of the electromagnetic pulse valve. The bottom end of the exhaust pipe is connected to the valve cover chamber, and the top end of the exhaust pipe is provided with an exhaust outlet to discharge the compressed air in the valve cover chamber.

[0008] Furthermore, the exhaust pipe is independently configured from the valve cover body.

[0009] Furthermore, the top of the exhaust pipe extends vertically upward on the upper surface of the valve cover body.

[0010] Furthermore, the exhaust outlet is located on the side of the exhaust pipe to horizontally discharge air from the valve cover chamber.

[0011] Furthermore, a perforation is provided on the side of the exhaust pipe, and a conduit passes through the perforation. The inner end of the conduit is located inside the exhaust pipe and communicates with the exhaust pipe, the outer end of the conduit is located outside the exhaust pipe, and the outer end port of the conduit constitutes the exhaust outlet.

[0012] Furthermore, a gas passage is provided on the upper surface of the valve cover, and the exhaust pipe is connected to the valve cover body through the gas passage and communicates with the valve cover chamber.

[0013] Furthermore, the bottom end of the exhaust pipe is sealed and fitted onto the gas passage opening, and is connected to the gas passage opening.

[0014] Furthermore, a connector is provided on the side of the exhaust pipe opposite to the exhaust outlet.

[0015] Furthermore, the connecting element is a flange.

[0016] Secondly, embodiments of this application provide an electromagnetic pulse valve, characterized in that it includes a valve cover as described in any of the first aspects. As described above, this embodiment of the application separates the exhaust pipe from the valve cover body, placing the exhaust pipe externally on the valve cover body. This increases the cross-sectional area of ​​the exhaust channel, reduces the bends in the exhaust channel, lowers exhaust resistance, and effectively improves the output pressure rise rate, achieving at least the following technical effects: (1) Fast response: The significantly reduced back pressure allows the valve core to accelerate faster under the action of electromagnetic force, increasing the opening speed by more than 40%.

[0017] (2) High efficiency dust removal: Higher peak pressure and faster pressure rise rate mean stronger dust removal kinetic energy and more thorough dust removal.

[0018] (3) Energy saving and consumption reduction: The air source pressure required to achieve the same dust removal effect can be reduced, or the pulse interval can be extended, and the overall air consumption is reduced by 20%-35%. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an electromagnetic pulse valve in the prior art; Figure 2 This is a schematic diagram of the electromagnetic field of an electromagnetic pulse valve in the prior art; Figure 3 The pressure-time curve of an electromagnetic pulse valve in the prior art; Figure 4 This is a schematic diagram of the valve cover structure in the prior art; Figure 5 This is a top view of the valve cover in the prior art; Figure 6 This is a schematic diagram of the working stroke of the moving column in the existing technology; Figure 7 This is a schematic diagram of the exhaust channel inside the valve cover in the prior art; Figure 8 This is a simplified diagram of the gas flow direction inside the valve cover in the prior art; Figure 9 This is a schematic diagram of the valve cover structure in one embodiment of this application; Figure 10 This is a cross-sectional view of the valve cover in one embodiment of this application; Figure 11 This is a top view of the valve cover in one embodiment of this application; Figure 12This is a schematic diagram of the valve cover portion structure in one embodiment of this application; Figure 13 This is a simplified diagram of the gas flow direction inside the valve cover in one embodiment of this application. Detailed Implementation

[0021] This application provides a valve cover and an electromagnetic pulse valve containing the same, which solves the technical problem of low output pressure rise rate of electromagnetic pulse valves in the prior art. As stated in the background section, such as Figure 1 , 4 As shown in Figure 5, compressed air in the second chamber 2 is ejected from the horizontally opened exhaust port 8 on the valve cover 9, where ΦA is the diameter of the exhaust port 8, ΦB is the diameter of the valve cover neck, and the shaded area D is the actual cross-section of the exhaust channel from the second chamber 2 to the third chamber 3, which is crescent-shaped. Figure 4 , 5 As shown, the conventional electromagnetic pulse valve has ΦA=22mm and ΦB=36mm, and the cross-sectional area of ​​the exhaust passage from the second chamber 2 to the third chamber 3 is approximately 220~260mm².

[0022] In addition, such as Figure 6 As shown, the moving column 6 has a working stroke, namely the moving column working stroke δ. When the electromagnetic coil 12 is energized, the moving column 6 is lifted and opened, expelling the compressed air from the third chamber 3. The moving column working stroke δ is generally controlled between 1.2 and 1.4 mm.

[0023] After careful study and analysis, the applicant discovered that: First, after the electromagnetic coil 12 is energized, the moving column 6 is lifted to expel air, requiring the moving column 6 to respond quickly. The electromagnetic field 13 generated by the coil 12 flows through the working stroke δ of the moving column and enters the moving column 6. The larger the value of δ, the greater the resistance to the electromagnetic field 13. This is because the working stroke δ region of the moving column is air, which has a low magnetic permeability, making it difficult for the electromagnetic field 13 to pass through. The magnetic permeability of air is hundreds of times lower than that of the moving column 6, therefore, the opening speed of the moving column 6 is low.

[0024] Secondly, such as Figure 7 As shown, the exhaust port 8 is integrally located inside the valve cover 9. Due to the space occupied by the exhaust port 8, the exhaust channel has a corner area m. The compressed air in the second chamber 2 needs to pass through the exhaust channel inside the valve cover 9 and then be ejected through the exhaust port 8, requiring it to pass through multiple bends and turns. The airflow direction n is as follows: Figure 7 , 8 As shown. At the same time, the cross-sectional area D of the exhaust channel of the second chamber 2 is crescent-shaped, with a small cross-sectional area and large flow resistance; in addition, the size of the exhaust port 8 is limited by the size of the exhaust channel, with a small diameter and large flow resistance. This results in a small peak pressure rise rate generated at the exhaust port 8 in the second chamber 2, which indirectly reduces the output pressure rise rate of the electromagnetic pulse valve at the valve outlet 11.

[0025] Based on the above analysis, the applicant found that the reasons for the low output pressure rise rate of the electromagnetic pulse valve in the prior art include: 1. The exhaust channel of the electromagnetic pulse valve is usually a structure with a constant cross section or a partially contracted structure. When the gas flows, turbulence and back pressure are easily generated, resulting in slow exhaust speed and affecting the dust removal effect. 2. The exhaust channel is poorly designed: the angle between the exhaust port 8 and the airflow direction n is too large, and the airflow needs to change direction multiple times to be discharged. Dead zones are easily formed at the corner area m.

[0026] To address this issue, this application provides an electromagnetic pulse valve that solves the aforementioned technical problem by replacing the built-in exhaust port 8 in the prior art with an external exhaust channel 200. The technical solution will now be described in detail with reference to the accompanying drawings and specific embodiments. One or more embodiments of this application provide an electromagnetic pulse valve, such as Figures 9-12 As shown, the electromagnetic pulse valve includes a valve cover, which includes a valve cover body 100. An exhaust pipe 200 is externally connected to the valve cover body 100. The exhaust pipe 200 is located above the valve cover body 100 and extends upward on the upper surface of the valve cover body 100. The exhaust pipe 200 is used to discharge air from the second chamber 2 (i.e., the valve cover chamber) of the electromagnetic pulse valve.

[0027] Specifically, the bottom end of the exhaust pipe 200 is connected to the second chamber 2, the top end of the exhaust pipe 200 extends vertically upward, and an exhaust outlet 210 is constructed on the top end of the exhaust pipe 200 to exhaust the compressed air in the second chamber 2.

[0028] Thus, by placing the exhaust pipe 200 externally on the valve cover body 100, the structure of the gas passage of the valve cover is changed, the exhaust passage is unobstructed, and the cross-section of the exhaust passage changes from a crescent shape in the prior art to a circle, thereby increasing the cross-sectional area of ​​the gas passage. Figure 11 The shaded area E represents the cross-section of the exhaust channel in this embodiment. When the diameter of the exhaust channel cross-section is 24 mm, the cross-sectional area of ​​the exhaust channel is approximately 452 mm². 2 Compared to existing technologies, it is significantly larger.

[0029] In addition, such as Figure 7 , 8As shown, in the prior art, the airflow has a 180-degree turn at the corner region m, resulting in a significant change in the airflow direction n. This greatly increases the resistance of the exhaust channel, causing a slow valve core opening speed and a reduced pulse jet response speed. However, in this embodiment, the exhaust pipe 200 is externally placed on top of the valve cover body 100. The exhaust pipe 200 utilizes the natural upward trend of the gas to quickly exhaust air, eliminating the 180-degree turn in the airflow corner region. This makes the airflow direction R in this embodiment 90°. Figure 10 , 13 As shown; at the same time, since the exhaust pipe 200 is not limited by the size of the valve cover body 100, the diameter of the exhaust pipe 200 can be increased to further reduce the exhaust resistance, so that the electromagnetic pulse valve pilot coil 12 is energized and quickly opens the exhaust channel, so that the gas in the second chamber 2 is quickly emptied, and the diaphragm 7 can quickly open to complete the blowing.

[0030] As described above, this embodiment of the application separates the exhaust pipe 200 from the valve cover body 100, placing the exhaust pipe 200 externally on the valve cover body 100. This increases the cross-sectional area of ​​the exhaust channel and reduces the bends in the exhaust channel, thereby lowering exhaust resistance and achieving at least the following technical effects: (1) Fast response: The significantly reduced back pressure allows the valve core to accelerate faster under the action of electromagnetic force, increasing the opening speed by more than 40%.

[0031] (2) High efficiency dust removal: Higher peak pressure and faster pressure rise rate mean stronger dust removal kinetic energy and more thorough dust removal.

[0032] (3) Energy saving and consumption reduction: The air source pressure required to achieve the same dust removal effect can be reduced, or the pulse interval can be extended, and the overall air consumption is reduced by 20%-35%. In one embodiment of this application, as Figures 9-12 As shown, the exhaust outlet 210 is located on the side of the exhaust pipe 200 to horizontally discharge compressed air from the second chamber 2.

[0033] Furthermore, a perforation is provided on the side of the exhaust pipe 200, and a conduit 220 is inserted horizontally into the perforation. The inner end of the conduit 220 is located inside the exhaust pipe 200 and communicates with the exhaust pipe 200. The outer end of the conduit 220 is located outside the exhaust pipe 200, and the outer end port of the conduit 220 constitutes the exhaust outlet.

[0034] Specifically, the inner end of the conduit 220 is a flared opening that gradually widens outward. In one embodiment of this application, as Figures 9-12As shown, a gas passage port 110 is provided on the upper surface of the valve cover body 100, and the exhaust pipe 200 is connected to the valve cover body 100 through the gas passage port 110 and communicates with the second chamber 2. Furthermore, the bottom end of the exhaust pipe 200 is sealed to the gas passage opening 110.

[0035] For example, in one embodiment of this application, the bottom end of the exhaust pipe 200 is inserted into and fixed to the gas passage 110 and connected to it. The bottom end of the exhaust pipe 200 is sealed and sleeved on the gas passage 110 and connected to the gas passage 110.

[0036] In another embodiment of this application, the bottom end of the exhaust pipe 200 is connected to and communicates with the gas passage 110 by a thread. The inner wall of the bottom end of the exhaust pipe 200 is provided with an internal thread, and the outer wall of the gas passage 110 may be provided with an external thread. The two are connected and communicated through the internal thread and the external thread.

[0037] Of course, the bottom end of the exhaust pipe 200 and the gas passage 110 can also be fixed and connected in other ways, which is not limited here. In one embodiment of this application, a connector 230 is provided on the side of the exhaust pipe 200 opposite to the exhaust outlet 210. The connector 230 is used to connect other components, such as a flange. It should be understood that although quantifiers such as "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit.

[0038] The directional terms such as "outer," "middle," and "inner" mentioned or potentially used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0039] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the method of this application, and these improvements and additions should also be considered within the protection scope of this utility model. Any modifications, alterations, and equivalent changes made by those skilled in the art without departing from the spirit and scope of this application, based on the disclosed technical content, are equivalent embodiments of this application. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of this application still fall within the scope of the technical solution of this application.

Claims

1. A valve cover for an electromagnetic pulse valve, characterized in that, The valve cover includes a valve cover body, and an exhaust pipe is externally connected to the upper surface of the valve cover body. The exhaust pipe is used to discharge the air from the valve cover chamber of the electromagnetic pulse valve. The bottom end of the exhaust pipe is connected to the valve cover chamber, and the top end of the exhaust pipe is provided with an exhaust outlet to discharge the compressed air in the valve cover chamber.

2. A valve cover as described in claim 1, characterized in that, The exhaust pipe is independently configured from the valve cover body.

3. A valve cover as described in claim 1, characterized in that, The top of the exhaust pipe extends vertically upward on the upper surface of the valve cover body.

4. A valve cover as described in claim 1, characterized in that, The exhaust outlet is located on the side of the exhaust pipe to horizontally discharge air from the valve cover chamber.

5. A valve cover as described in claim 4, characterized in that, The exhaust pipe has a perforation on its side, and a conduit passes through the perforation. The inner end of the conduit is located inside the exhaust pipe and communicates with the exhaust pipe, the outer end of the conduit is located outside the exhaust pipe, and the outer end port of the conduit constitutes the exhaust outlet.

6. A valve cover as described in claim 1, characterized in that, A gas passage is provided on the upper surface of the valve cover, and the exhaust pipe is connected to the valve cover body through the gas passage and communicates with the valve cover chamber.

7. A valve cover as described in claim 6, characterized in that, The bottom end of the exhaust pipe is sealed and fitted onto the gas passage opening, and is connected to the gas passage opening.

8. A valve cover as described in claim 1, characterized in that, A connector is also provided on the side of the exhaust pipe opposite to the exhaust outlet.

9. A valve cover as described in claim 8, characterized in that, The connecting component is a flange.

10. An electromagnetic pulse valve, characterized in that, Includes the valve cover as described in any one of claims 1 to 9.

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