Large-flow pilot-operated type electromagnetic valve

Abstract

The utility model provides a large-flow pilot-operated type electromagnetic valve which comprises a valve body and a piston assembly, the valve body is provided with a horizontal first axis and a second axis inclined to the first axis, and a medium inlet, a medium outlet, a main valve port and a piston cavity are formed in the valve body. The medium inlet, the medium outlet and the first axis are coaxially arranged, and the main valve port, the piston cavity, the piston assembly and the second axis are coaxially arranged; the piston assembly is installed in the piston cavity in a sliding mode and used for opening and closing the main valve port so that the medium inlet and the medium outlet can be communicated or disconnected. The large-flow pilot-operated type electromagnetic valve overcomes the defect that an existing pilot-operated type electromagnetic valve is small in passing flow.

Description

Technical Field

[0001] This utility model relates to the field of pilot-operated solenoid valves, and in particular to a high-flow-rate pilot-operated solenoid valve. Background Technology

[0002] For high-flow solenoid valves, we usually choose direct-acting solenoid valves. These valves are characterized by their large size, low operating pressure, and high cost, which is far from meeting the pressure requirements of most pipelines. Currently, most high-pressure, high-flow solenoid valves on the market are pilot-operated piston type solenoid valves.

[0003] For example, patent number CN221897224U discloses a high-pressure, high-flow solenoid valve. Its integrated valve body has a medium inlet and a medium outlet on both sides, staggered in the height direction. The medium inlet and outlet are connected through a main valve port. A pilot chamber and a main valve chamber are respectively connected to each other on the upper and lower sides of the main valve port. The pilot chamber is connected to the medium outlet through a secondary valve port, located above the main valve port. The main valve port, pilot chamber, main valve port, and secondary valve port are all located on the same central axis. In this structure, because the axis of the main valve port is perpendicular to the axes of the inlet and outlet, the flow resistance of the medium is relatively large, resulting in a relatively small flow rate. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The problem to be solved by this utility model is to provide a high-flow-rate pilot-operated solenoid valve to overcome the defect of existing pilot-operated solenoid valves having a small flow rate.

[0006] (II) Technical Solution

[0007] To solve the aforementioned technical problem, this utility model provides a high-flow-rate pilot-operated solenoid valve, comprising a valve body and a piston assembly. The valve body has a horizontal first axis and a second axis inclined to the first axis. The valve body is provided with a medium inlet, a medium outlet, a main valve port, and a piston chamber. The medium inlet and the medium outlet are coaxially arranged with the first axis, and the main valve port, the piston chamber, and the piston assembly are coaxially arranged with the second axis. The piston assembly is slidably installed in the piston chamber and is used to open and close the main valve port to connect or disconnect the medium inlet and the medium outlet.

[0008] In some embodiments, the system further includes a valve cover that covers the top of the piston chamber, wherein a piston upper chamber is formed between the lower side of the valve cover and the piston assembly, and a pilot chamber is formed on the upper side of the valve cover; the piston upper chamber is connected to the medium inlet through a balance hole, the pilot chamber is connected to the piston upper chamber through a backflush pilot hole, and the pilot chamber is connected to the medium outlet through a through hole.

[0009] In some embodiments, the balance hole and the recoil pilot hole are arranged coaxially with the second axis, and the diameter of the balance hole is smaller than the diameter of the recoil pilot hole.

[0010] In some embodiments, a magnetic shielding tube assembly is threadedly connected to the upper end of the valve cover, and a pilot cavity is formed between the magnetic shielding tube assembly and the valve cover; an iron core assembly is slidably installed in the pilot cavity, and the iron core assembly is used to open and close the recoil pilot hole, thereby causing the piston assembly to move; the magnetic shielding tube assembly, the iron core assembly and the second axis are arranged coaxially.

[0011] In some embodiments, the piston assembly has an annular flange at its top end, and a piston limiting boss for limiting the annular flange is provided in the piston cavity; a piston ring is fitted on the annular flange, and the piston ring divides the piston cavity into an upper piston cavity and a lower piston cavity.

[0012] In some embodiments, the piston assembly includes a piston body, a valve port seal mounted on the bottom of the piston body, and a seal block, wherein the valve port seal is disposed between the piston body and the seal block, and the seal block is fixedly connected to the piston body by a first fastener; the balance hole is disposed inside the seal block.

[0013] In some embodiments, the core assembly includes a slidable core, a pilot hole seal fixed to the lower end of the core, and a plurality of core guide rings spaced apart and fitted onto the outer wall of the core.

[0014] In some embodiments, a piston spring is installed between the valve cover and the piston assembly, the piston spring always tending to move the piston assembly toward the main valve port; an iron core spring is installed between the iron core assembly and the magnetic shielding tube assembly, the iron core spring always tending to move the iron core assembly toward the recoil pilot hole.

[0015] In some embodiments, a coil is fitted on the outside of the magnetic shielding tube assembly, and the coil is fixedly connected to the magnetic shielding tube assembly by a second fastener; a first seal is installed between the valve body and the valve cover, and a second seal is installed between the magnetic shielding tube assembly and the valve cover.

[0016] In some embodiments, the angle between the first axis and the second axis is 50 degrees.

[0017] (III) Beneficial Effects

[0018] The high-flow pilot-operated solenoid valve provided by this utility model has the following advantages compared with the prior art:

[0019] 1) The first axis X1 and the second axis X2 are at a 50-degree angle. Compared with the existing right-angle layout, the 50-degree angle layout can significantly reduce the flow resistance of the fluid, so the flow rate of the fluid will be greater under the same pressure. It increases the flow rate by reducing the flow resistance of the medium. At the same time, the use of a pilot-operated solenoid valve structure can significantly reduce the power of the coil and the cost will also be reduced accordingly.

[0020] 2) When the coil is de-energized, the piston assembly will quickly close the main valve port. Since the main valve port and the piston assembly are of the reverse type, the piston assembly has a buffering effect at the moment of closing under the action of the piston spring, thereby reducing the closing speed of the main valve port, which can reduce the water hammer phenomenon generated by the solenoid valve at the moment of closing and protect the valve port seals and pipelines.

[0021] 3) Through the cooperation of the annular flange and the piston limiting boss, the piston limiting boss can limit the downward position of the piston assembly, avoid damage to the valve port seal due to excessive downward pressure of the piston assembly under high pressure, and thus greatly increase the service life of the valve port seal. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a high-flow-rate pilot-operated solenoid valve according to the present invention;

[0024] Figure 2 This is a schematic diagram of the valve body of a high-flow-rate pilot-operated solenoid valve according to the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of a high-flow-rate pilot-operated solenoid valve piston assembly according to the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of the valve cover of a high-flow pilot-operated solenoid valve according to the present invention.

[0027] Figure 5 This is a schematic diagram of the structure of a high-flow-rate pilot-operated solenoid valve core assembly according to the present invention.

[0028] The component names corresponding to the various reference numerals in the figure are as follows: 1. Valve body; 101. Medium inlet; 102. Medium outlet; 103. Main valve port; 104. Piston chamber; 105. Piston limiting boss; 2. Piston assembly; 21. Piston body; 22. Valve port seal; 23. Seal block; 24. First fastener; 25. Piston ring; 201. Upper piston chamber; 202. Balance hole; 211. Annular flange; 3. Valve cover; 301. Recoil pilot hole; 302. Pilot chamber; 303. Through hole; 4. Magnetic shielding tube assembly; 5. Iron core assembly; 51. Iron core; 52. Pilot hole seal; 53. Iron core guide ring; 6. Piston spring; 7. Iron core spring; 8. Coil; 9. Second fastener; 10. First seal. Detailed Implementation

[0029] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0032] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0034] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0035] See Figures 1 to 5 This utility model provides a high-flow pilot-operated solenoid valve, including a valve body 1, a piston assembly 2, a valve cover 3, a magnetic shielding tube assembly 4, an iron core assembly 5, and a coil 8.

[0036] See Figure 1 and Figure 2 The valve body 1 has a horizontal first axis X1 and a second axis X2 arranged obliquely to the first axis X1. In this embodiment, the included angle between the first axis X1 and the second axis X2 is preferably 50 degrees. The valve body 1 is provided with a medium inlet 101, a medium outlet 102, a main valve port 103, and a piston chamber 104. The medium inlet 101 and the medium outlet 102 are located on opposite sides of the valve body 1, and are coaxially arranged with the first axis X1. The medium inlet 101 and the medium outlet 102 can be connected through the main valve port 103. The main valve port 103, the piston chamber 104, and the piston assembly 2 are coaxially arranged with the second axis X2. The piston assembly 2 is slidably installed in the piston chamber 104 and is used to open and close the main valve port 103 to connect or disconnect the medium inlet 101 and the medium outlet 102. In this structure, the first axis X1 and the second axis X2 are at a 50-degree angle. Compared with the existing right-angle layout, the 50-degree angle layout can significantly reduce the flow resistance of the fluid, so the flow rate of the fluid will be greater under the same pressure. It increases the flow rate by reducing the flow resistance of the medium. At the same time, the use of a pilot-operated solenoid valve structure can significantly reduce the power of the coil, and the cost will also be reduced accordingly.

[0037] In some embodiments, such as Figure 1 and Figure 4As shown, the high-flow pilot-operated solenoid valve also includes a valve cover 3 that covers the top of the piston chamber 104, and the valve cover 3 is fixedly connected to the valve body 1. A piston upper chamber 201 is formed between the lower side of the valve cover 3 and the piston assembly 2, and a pilot chamber 302 is formed on the upper side of the valve cover 3. The piston upper chamber 201 is connected to the medium inlet 101 through a balance hole 202, and the pilot chamber 302 is connected to the piston upper chamber 201 through a recoil pilot hole 301. The pilot chamber 302 is connected to the medium outlet 102 through a through hole 303. Part of the through hole 303 is located on the valve cover 3, and the other part is located on the valve body 1. The balance hole 202 and the recoil pilot hole 301 are arranged coaxially with the second axis X2, and the diameter of the balance hole 202 is smaller than the diameter of the recoil pilot hole 301. The diameter of the balance hole is smaller than that of the recoil pilot hole. When the recoil pilot hole is opened, a certain pressure difference will be generated between the upper and lower parts of the piston assembly due to the difference in hole diameter. Under the action of the pressure difference, the piston assembly will be lifted upward, and the main valve port 103 will be opened to ensure the reliability of the function.

[0038] This structure uses a recoil pilot hole 301 connected to the upper chamber 201 of the piston. When the solenoid valve is closed, the recoil pilot hole 301 is normally closed under the action of the iron core spring 7. When the solenoid valve is under overpressure, the recoil pilot hole 301 will be pushed open under pressure, and the pressure in the upper chamber 201 of the piston will be relieved through the recoil pilot hole 301. Therefore, this high-flow pilot-operated solenoid valve has an overpressure protection function and is safe and reliable to use.

[0039] In some embodiments, such as Figure 1 As shown, the upper end of the valve cover 3 is threadedly connected to a magnetic shielding tube assembly 4. The top of the valve cover 3 has an internal thread, and the magnetic shielding tube assembly 4 is threadedly connected to the valve cover 3 via this internal thread. A pilot cavity 302 is formed between the magnetic shielding tube assembly 4 and the valve cover 3. An iron core assembly 5 is slidably installed within the pilot cavity 302. The iron core assembly 5 is used to open and close the recoil-type pilot hole 301, thereby causing the piston assembly 2 to move. The magnetic shielding tube assembly 4, the iron core assembly 5, and the second axis X2 are arranged coaxially. The magnetic shielding tube assembly 4 is existing technology and will not be described further in this embodiment.

[0040] In some embodiments, such as Figures 1 to 3 As shown, the piston assembly 2 has an annular flange 211 at its top end, and a piston limiting boss 105 for limiting the annular flange 211 is provided in the piston cavity 104. A piston ring 25 is fitted on the annular flange 211, and the piston ring 25 divides the piston cavity 104 into an upper piston cavity 201 and a lower piston cavity. In this structure, through the cooperation of the annular flange 211 and the piston limiting boss 105, the piston limiting boss 105 can limit the downward position of the piston assembly 2, avoiding excessive downward pressure of the piston assembly 2 under high pressure, which could damage the valve port seal, thereby significantly increasing the service life of the valve port seal.

[0041] In some embodiments, such as Figure 3 As shown, the piston assembly 2 includes a piston body 21, a valve port seal 22 installed at the bottom of the piston body 21, and a seal block 23. An annular flange 211 is integrally disposed at the top of the piston body 21. The valve port seal 22 is placed between the piston body 21 and the seal block 23. The seal block 23 is fixedly connected to the piston body 21 by a first fastener 24, thereby locking the valve port seal 22. A balance hole 202 is disposed inside the seal block 23.

[0042] In some embodiments, such as Figure 5 As shown, the core assembly 5 includes a slidable core 51, a pilot hole seal 52 fixed to the lower end of the core 51, and multiple core guide rings 53 spaced apart and fitted onto the outer wall of the core 51. The core guide rings 53 maintain the concentricity of the core assembly and the magnetic shielding tube assembly, while reducing friction between the core and the magnetic shielding tube assembly, thus increasing the service life of the core.

[0043] In some embodiments, such as Figure 1 As shown, a piston spring 6 is installed between the valve cover 3 and the piston assembly 2. The piston spring 6 is located in the upper chamber 201 of the piston. The piston spring 6 always makes the piston assembly 2 tend to move towards the main valve port 103. In this structure, the piston assembly is installed in the piston chamber. Relative to the direction of fluid inlet, the position of the piston assembly is counter-current. With the piston spring acting on the piston assembly, the piston assembly has a certain buffer at the moment the main valve port closes. This can reduce the water hammer phenomenon generated when the solenoid valve closes, and also protect the valve port seals from impact damage.

[0044] like Figure 1 As shown, a core spring 7 is installed between the core assembly 5 and the magnetic shielding tube assembly 4. The core spring 7 always tends to cause the core assembly 5 to move towards the recoil pilot hole 301. The core spring is located inside the core, so that the core assembly has a certain clamping force on the recoil pilot hole 301. Within a certain pressure range, the recoil pilot hole 301 will not be forced open. Only when a certain pressure is reached will the recoil pilot hole 301 be forced open, thus giving it the function of overpressure protection.

[0045] In some embodiments, such as Figure 1 As shown, a coil 8 is fitted on the outside of the magnetic shielding tube assembly 4, and the coil 8 is fixedly connected to the magnetic shielding tube assembly 4 by a second fastener 9; a first sealing element 10 is installed between the valve body 1 and the valve cover 3, and a second sealing element 11 is installed between the magnetic shielding tube assembly 4 and the valve cover 3 to ensure sealing performance.

[0046] The operation of this high-flow-rate pilot-operated solenoid valve is as follows:

[0047] This high-flow-rate pilot-operated solenoid valve is a normally closed type, meaning it closes when coil 8 is de-energized and opens when coil 8 is energized. When coil 8 is de-energized, the recoil pilot port 301 is closed, and fluid enters from the medium inlet 101, passes through the balance port 202, and enters the upper chamber 201 of the piston. The upper and lower chambers of the piston assembly 2 achieve pressure balance. Under the combined action of the area difference between the upper and lower chambers of the piston assembly 2 and the piston spring 6, the piston assembly 2 keeps the main valve port 103 closed, at which point the solenoid valve is in a normally closed state. When the incoming fluid pressure exceeds the pressure set by the solenoid valve, the elasticity of the core spring 7 is insufficient to keep the recoil pilot port 301 closed. At this time, the pressure will be released to the medium outlet 102 through the recoil pilot port 301 and the through port 303 until the elasticity of the core spring 7 can satisfy the closure of the recoil pilot port 301, while the main valve port 103 remains closed. Therefore, this solenoid valve has an overpressure protection function.

[0048] When coil 8 is energized, the electromagnetic force generated by coil 8 overcomes the elastic force of iron core spring 7, causing iron core assembly 5 to move upward. The recoil pilot hole 301 opens, and the pressure in piston upper chamber 201 is relieved to medium outlet 102 through recoil pilot hole 301 and through hole 303. Due to the different diameters of balance hole 202 and recoil pilot hole 301, the pressure in medium inlet 101 is greater than that in piston upper chamber 201. Under the action of this pressure difference, piston assembly 2 overcomes the elastic force of piston spring 6 and lifts upward, opening main valve port 103. At this time, the solenoid valve is in the open state. Since the centerline of piston chamber 104 and main valve port 103 forms a 50-degree angle with the centerline of medium inlet and medium outlet, the flow resistance of fluid through main valve port 103 will be significantly reduced, thus increasing the flow rate through main valve port 103. When the coil 8 is de-energized again, the piston assembly 2 will quickly close the main valve port 103. Since the main valve port 103 has a recoil-type structure, under the action of the piston spring 6, the piston assembly 2 has a buffering effect at the moment of closing, thereby reducing the closing speed of the main valve port 103. This can reduce the water hammer phenomenon generated by the solenoid valve at the moment of closing, and protect the valve port seals and pipelines.

[0049] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0050] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A high-flow-rate pilot-operated solenoid valve, comprising a valve body (1) and a piston assembly (2), characterized in that: The valve body (1) has a horizontal first axis (X1) and a second axis (X2) inclined to the first axis (X1). The valve body (1) is provided with a medium inlet (101), a medium outlet (102), a main valve port (103) and a piston chamber (104). The medium inlet (101) and the medium outlet (102) are arranged coaxially with the first axis (X1). The main valve port (103), the piston chamber (104) and the piston assembly (2) are arranged coaxially with the second axis (X2). The piston assembly (2) is slidably installed in the piston chamber (104) and is used to open and close the main valve port (103) so that the medium inlet (101) and the medium outlet (102) are connected or interrupted.

2. The high-flow-rate pilot-operated solenoid valve as described in claim 1, characterized in that: It also includes a valve cover (3) covering the top of the piston chamber (104), and a piston upper chamber (201) is formed between the lower side of the valve cover (3) and the piston assembly (2), and a pilot chamber (302) is formed on its upper side; the piston upper chamber (201) is connected to the medium inlet (101) through the balance hole (202), the pilot chamber (302) is connected to the piston upper chamber (201) through the recoil pilot hole (301), and the pilot chamber (302) is connected to the medium outlet (102) through the through hole (303).

3. The high-flow-rate pilot-operated solenoid valve as described in claim 2, characterized in that: The balance hole (202) and the recoil pilot hole (301) are arranged coaxially with the second axis (X2), and the diameter of the balance hole (202) is smaller than the diameter of the recoil pilot hole (301).

4. The high-flow-rate pilot-operated solenoid valve as described in claim 2, characterized in that: The upper end of the valve cover (3) is threadedly connected to a magnetic shielding tube assembly (4), and the magnetic shielding tube assembly (4) and the valve cover (3) form the pilot cavity (302); an iron core assembly (5) is slidably installed in the pilot cavity (302), and the iron core assembly (5) is used to open and close the recoil pilot hole (301), thereby causing the piston assembly (2) to move; the magnetic shielding tube assembly (4), the iron core assembly (5) and the second axis (X2) are arranged coaxially.

5. The high-flow-rate pilot-operated solenoid valve as described in claim 2, characterized in that: The piston assembly (2) is provided with an annular flange (211) at its top end, and a piston limiting boss (105) for limiting the annular flange (211) is provided in the piston cavity (104); a piston ring (25) is fitted on the annular flange (211), and the piston ring (25) divides the piston cavity (104) into the upper piston cavity (201) and the lower piston cavity.

6. The high-flow-rate pilot-operated solenoid valve as described in claim 2, characterized in that: The piston assembly (2) includes a piston body (21), a valve port seal (22) installed at the bottom of the piston body (21), and a seal block (23). The valve port seal (22) is placed between the piston body (21) and the seal block (23). The seal block (23) is fixedly connected to the piston body (21) by a first fastener (24). The balance hole (202) is disposed inside the seal block (23).

7. The high-flow-rate pilot-operated solenoid valve as described in claim 4, characterized in that: The core assembly (5) includes a slidable core (51), a pilot hole seal (52) fixed to the lower end of the core (51), and a plurality of core guide rings (53) spaced apart and fitted on the outer wall of the core (51).

8. The high-flow-rate pilot-operated solenoid valve as described in claim 4, characterized in that: A piston spring (6) is installed between the valve cover (3) and the piston assembly (2), and the piston spring (6) always tends to move the piston assembly (2) toward the main valve port (103); a core spring (7) is installed between the core assembly (5) and the magnetic shielding tube assembly (4), and the core spring (7) always tends to move the core assembly (5) toward the recoil pilot hole (301).

9. The high-flow-rate pilot-operated solenoid valve as described in claim 4, characterized in that: A coil (8) is fitted on the outside of the magnetic shielding tube assembly (4), and the coil (8) is fixedly connected to the magnetic shielding tube assembly (4) by a second fastener (9); a first sealing element (10) is installed between the valve body (1) and the valve cover (3), and a second sealing element (11) is installed between the magnetic shielding tube assembly (4) and the valve cover (3).

10. The high-flow-rate pilot-operated solenoid valve as described in claim 1, characterized in that: The angle between the first axis (X1) and the second axis (X2) is 50 degrees.

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