A reversing valve

Abstract

The application discloses a reversing valve, which comprises a main valve and a pilot valve, the main valve comprises a first valve body and a first valve core component, the first valve core component is arranged in the first valve body, and the inner cavity of the first valve body is formed with accommodating spaces on both axial sides of the first valve core component; after the reversing of the first valve core component is completed, the volume of the accommodating space with relatively larger volume is a first volume, the volume of the inner cavity of the pilot valve is a second volume, and the volume ratio of the second volume to the first volume is greater than 1 / 15. The reversing valve can stably realize reversing.

Description

[0001] This application claims priority to Chinese Patent Application No. 2025100234089, filed on January 7, 2025, entitled "A Reversing Valve". Technical Field

[0002] This invention relates to the field of fluid control technology, and more specifically to a reversing valve applied in a refrigeration system. Background Technology

[0003] A directional control valve consists of a main valve and a pilot valve. The pilot valve is used to send high-pressure gas from the system into the main valve, which in turn moves the valve core within the main valve, thus completing the directional control. However, if the high-pressure gas in the system cannot be continuously supplied to the pilot valve, it may result in insufficient directional pressure within the main valve, affecting the reliability of the directional control.

[0004] Therefore, how to provide a solution to overcome or alleviate the above-mentioned defects remains a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a reversing valve that can reversing reliably.

[0006] To solve the above-mentioned technical problems, the present invention provides a reversing valve, including a main valve and a pilot valve. The main valve includes a first valve body and a first valve core component. The first valve core component is disposed in the first valve body. The inner cavity of the first valve body forms accommodating spaces on both axial sides of the first valve core component. After the first valve core component completes reversing, the volume of the larger of the two accommodating spaces is the first volume, and the volume of the inner cavity of the pilot valve is the second volume. The volume ratio of the second volume to the first volume is greater than 1 / 15.

[0007] Using the above scheme, under the condition that the normal pressure in the pilot valve cavity is 1.5MPa, even if there is insufficient pressure difference between the high-pressure inlet pipe and the low-pressure outlet pipe of the pilot valve, when the fluid in the pilot valve cavity is introduced into the accommodating space and the volume of the accommodating space is increased to the first volume, the pressure in the accommodating space can still be maintained at 0.1MPa, which can still meet the requirements for reliable switching of the directional valve. That is, the accommodating space can be expanded to the aforementioned first volume, thereby realizing reliable actuation of the first valve core component and stable switching.

[0008] In other words, by expanding the inner cavity of the pilot valve, this embodiment of the invention creatively proposes a solution to drive the first valve core component to move when there is insufficient pressure difference between the high-pressure inlet pipe and the low-pressure outlet pipe. This solution can be successfully implemented, enabling the directional valve provided by this embodiment of the invention to complete the directional switching even when there is insufficient pressure difference between the high-pressure inlet pipe and the low-pressure outlet pipe, thereby improving the reliability of the directional valve provided by this embodiment of the invention. Attached Figure Description

[0009] Figure 1 This is a three-dimensional structural diagram of the reversing valve provided in an embodiment of the present invention;

[0010] Figure 2 for Figure 1 The top view shows a partial section of the main valve;

[0011] Figure 3 A cross-sectional view of one implementation of the pilot valve;

[0012] Figure 4 This is a cross-sectional view of another implementation of the pilot valve.

[0013] Figure label:

[0014] 100 - Main valve; 110 - First valve body; 111 - First cylindrical section; 112 - End cap section; 120 - First valve core assembly; 130 - Accommodation space;

[0015] 200-Pilot valve; 210-Second valve body; 211-Second cylinder section; 212-Extended sleeve; 213-Main body section; 214-Extended section; 220-Drive assembly; 221-Sleeve section; 222-Plug head; 223-Drive component; 223A-Moving iron core; 223B-Reversing valve block; 223C-Reversing valve stem; 224-Elastic component; 230-High pressure inlet pipe; 240-Low pressure outlet pipe; 250-First connecting pipe; 260-Second connecting pipe; 270-Solenoid coil; 280-Valve seat. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solutions of the present invention, specific embodiments will be further described below in conjunction with the accompanying drawings.

[0017] In embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0018] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, "linking" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0019] In the description of embodiments of the present invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0020] Please refer to Figures 1-3 , Figure 1 This is a three-dimensional structural diagram of the reversing valve provided in an embodiment of the present invention; Figure 2 for Figure 1 The top view shows a partial section of the main valve; Figure 3 This is a cross-sectional view of one implementation of the pilot valve.

[0021] like Figures 1-3 As shown, this embodiment of the invention provides a reversing valve, specifically a four-way reversing valve, including a main valve 100 and a pilot valve 200.

[0022] The main valve 100 may include a first valve body 110 and a first valve core component 120.

[0023] The first valve body 110 may include a first cylindrical portion 111 and two end cap portions 112. The two end cap portions 112 may be located on opposite axial sides of the first cylindrical portion 111, and the two end cap portions 112 may be connected to the opposite axial ends of the first cylindrical portion 111. Specific connection methods may include welding, snap-fitting, riveting, flange connection, etc., and are not limited here, as long as they meet the usage requirements.

[0024] The first valve core component 120 can be disposed inside the first valve body 110 and can slide and seal with the first cylindrical portion 111. That is, the first valve core component 120 can be displaced along the first cylindrical portion 111, while simultaneously being sealed to the first cylindrical portion 111. An accommodating space 130 can be formed between the first valve core component 120 and both end cap portions 112. For ease of description, refer to... Figure 2 The orientation and positional relationships in the middle will Figure 2 The accommodating space on the left side is called the first accommodating space, and will Figure 2 The accommodating space on the right side is called the second accommodating space. Both the first and second accommodating spaces are used to introduce or extract fluid to push the first valve core component 120 to move within the first valve body 110, thereby completing the reversal. After the reversal is completed, that is, after the first valve core component 120 has moved into place, one of the two accommodating spaces 130 can have a relatively larger volume, while the other can have a relatively smaller volume; in this embodiment of the invention, the volume of the one with the relatively larger volume is defined as the first volume V1. Figure 2 The first volume V1 can be roughly the volume of the area circled by the double-dotted line.

[0025] The pilot valve 200 may include a second valve body 210, a drive assembly 220, a high-pressure inlet pipe 230, a low-pressure outlet pipe 240, a first connecting pipe 250, and a second connecting pipe 260.

[0026] The high-pressure inlet pipe 230, the low-pressure outlet pipe 240, the first connecting pipe 250, and the second connecting pipe 260 can all be installed on the second valve body 210 and connected to the valve seat 280 of the second valve body 210. Simultaneously, the first connecting pipe 250 and the second connecting pipe 260 can be connected to the two end caps 112 respectively, allowing the first connecting pipe 250 to communicate with the first accommodating space and the second connecting pipe 260 to communicate with the second accommodating space.

[0027] The drive assembly 220 may include a sleeve portion 221, a plug head 222, and a drive component 223. The sleeve portion 221 may be connected to the second valve body 210. Specific connection methods include welding, threaded connection, interference fit, etc., which are not limited here, as long as the reliability of the connection can be guaranteed. The plug head 222 may be installed at the end of the sleeve portion 221 away from the second valve body 210. Specific installation methods may also include welding, threaded connection, or interference fit, etc., which are not limited here, as long as the reliability of the connection can be guaranteed. At least a portion of the drive component 223 may be located within the sleeve portion 221 and be able to slide along the sleeve portion 221. An elastic component 224 may also be provided between the drive component 223 and the plug head 222. The elastic component 224 may be a spring, or an elastic deformable body made of a material with a certain elastic deformation capacity, such as rubber, latex, or silicone.

[0028] The driving component 223 may include a moving iron core 223A, a reversing valve block 223B, and a reversing valve stem 223C. The moving iron core 223A can be slidably mounted in the sleeve portion 221. The aforementioned elastic component 224 may specifically be disposed between the moving iron core 223A and the plug head 222. The moving iron core 223A may be provided with an inner hole to balance the pressure on both sides of the moving iron core 223A axially. The moving iron core 223A can be connected to the reversing valve block 223B through the reversing valve stem 223C. The electromagnetic coil 270 can be sleeved and mounted on the sleeve portion 221 and can apply electromagnetic force to the moving iron core 223A so that the moving iron core 223A drives the reversing valve block 223B from the first position ( Figure 3 The position shown in the figure is switched to the second position. When the electromagnetic coil 270 is de-energized, the elastic force of the elastic member 224 can be released, and the moving iron core 223A drives the reversing valve block 223B to switch from the second position to the first position.

[0029] A reversing space (not shown in the figure) is provided within the reversing valve block 223B. In the first position, refer to... Figure 3 The reversing space can connect the low-pressure outlet pipe 240 and the first connecting pipe 250, meaning the low-pressure outlet pipe 240 can be connected to the first accommodating space. The high-pressure inlet pipe 230 can be connected to the second connecting pipe 260, meaning the high-pressure inlet pipe 230 can be connected to the second accommodating space. In this case, the second accommodating space can become larger, and the first accommodating space can become smaller. Figure 2 The first valve core component 120 can be displaced to the left. In the second position, the reversing space can connect the low-pressure outlet pipe 240 and the second connecting pipe 260, that is, the low-pressure outlet pipe 240 can be connected to the second accommodating space, and the high-pressure inlet pipe 230 can be connected to the first connecting pipe 250, that is, the high-pressure inlet pipe 230 can be connected to the first accommodating space; at this time, the first accommodating space can become larger, and the second accommodating space can become smaller. Figure 2 The first valve core component 120 can be displaced to the right.

[0030] In other words, the displacement of the first valve core component 120 within the first cylindrical section 111 is mainly achieved based on the pressure difference between the high-pressure inlet pipe 230 and the low-pressure outlet pipe 240. However, in some special scenarios, the pressure difference between the high-pressure inlet pipe and the low-pressure outlet pipe may be insufficient. For example, the inlet pressure in the high-pressure inlet pipe may be low, which may result in the inability to generate a continuous and reliable thrust on the first valve core component, thereby affecting the reliability of the switching.

[0031] Therefore, the applicant, through extensive research, discovered that in conventional designs, the pilot valve cavity serves merely as a transitional chamber connecting the high-pressure inlet pipe, the low-pressure outlet pipe, and the first and second accommodating spaces within the main valve. Little attention is paid to the fact that the fluid within the pilot valve cavity (all spaces inside the pilot valve except for components, including the first space enclosed between the second valve body 210 and the drive assembly 220, and the second space within the drive assembly 220) can also be used for driving. Based on this, the volume of the pilot valve cavity in conventional designs is generally too small. For ease of description, the volume of the pilot valve cavity can be referred to as the second volume. In conventional designs, the volume ratio of the second volume to the first volume is typically 1 / 25. Thus, when the normal pressure within the pilot valve cavity is 1.5 MPa, even when the fluid in the pilot valve cavity is introduced into the accommodating space, allowing the accommodating space to expand to the aforementioned first volume, the pressure within the accommodating space is only 0.06 MPa, which is insufficient to meet the switching requirements; that is, the accommodating space cannot be expanded to the aforementioned first volume.

[0032] To address this, in this embodiment of the invention, the inner cavity of the pilot valve 200 is expanded, and the volume ratio of the second volume V2 to the first volume V1 is set to be greater than 1 / 15. Combined with... Figure 3 The second volume V2 can be roughly the volume of the area circled by the double-dotted line, including all the space inside the pilot valve 200 except for the parts.

[0033] Thus, under the condition that the normal pressure in the inner cavity of the pilot valve 200 is 1.5MPa, even if there is insufficient pressure difference between the high-pressure inlet pipe 230 and the low-pressure outlet pipe 240, when the fluid in the inner cavity of the pilot valve 200 is introduced into the accommodating space and the volume of the accommodating space is increased to the first volume, the pressure in the accommodating space can still be maintained at 0.1MPa, which can still meet the requirements for reliable switching of the directional valve. That is, the accommodating space can be expanded to the aforementioned first volume V1, thereby realizing reliable actuation of the first valve core component 120 and stable switching.

[0034] In other words, by expanding the inner cavity of the pilot valve 200, this embodiment of the invention creatively proposes a solution to drive the first valve core component 120 to move when there is insufficient pressure difference between the high-pressure inlet pipe 230 and the low-pressure outlet pipe 240. This solution can be successfully implemented, enabling the reversing valve provided by this embodiment of the invention to complete the reversing even when there is insufficient pressure difference between the high-pressure inlet pipe 230 and the low-pressure outlet pipe 240, thereby improving the reliability of the reversing valve provided by this embodiment of the invention.

[0035] Preferably, the volume ratio of the second volume V2 to the first volume V1 can be set to be greater than 1 / 10. This allows for a greater increase in the volume of the pilot valve cavity of the pilot valve 200. Under the condition that the normal pressure inside the pilot valve 200 cavity is 1.5 MPa, when the fluid enters the accommodating space 130 and increases its volume to the first volume V1, the accommodating space 130 can maintain a pressure of 0.15 MPa. This better satisfies the driving requirements of the first valve core component 120, thereby enabling more reliable switching.

[0036] In some alternative implementations, such as Figure 3 As shown, the second valve body 210 may include a second cylindrical portion 211 and an extension sleeve 212. The second cylindrical portion 211 may include a first end and a second end disposed opposite to each other. The extension sleeve 212 may be connected to the first end, and the specific connection method may be welding, threaded connection, or interference fit, etc., which is not limited here, as long as the reliability requirements of the connection can be guaranteed. The aforementioned drive assembly 220 may be connected to the second end.

[0037] In this implementation, the second valve body 210 adopts a split structure, which allows for easy adjustment of the size of the extension sleeve 212 as needed, thereby meeting the setting requirements of the second volume V2 of the pilot valve 200 inner cavity.

[0038] In this implementation, the first space formed by the second valve body 210 and the drive assembly 220 includes the internal space of the extended sleeve 212 and the remaining space in the second cylindrical portion 212 excluding the space occupied by the extended sleeve 212, the drive assembly 220, and the valve seat 280. The second space inside the drive assembly 220 refers to the space between the various components inside the drive assembly 220. The second space can communicate with the first space to jointly form the pilot valve cavity of the pilot valve 200.

[0039] Please refer to Figure 4 , Figure 4 This is a cross-sectional view of another implementation of the pilot valve.

[0040] In some alternative implementations, such as Figure 4 As shown, the second valve body 210 can also be an integral structure, including a main body 213 and an extended part 214, the extended part 214 being equivalent to an axial extension of the second valve body 210. Figure 4 The dashed lines are only used to schematically indicate the area of ​​the main body 213 and the extended part 214, and do not indicate that the main body 213 and the extended part 214 are separate structures.

[0041] The main body 213 has a first chamber, and the extended part 214 has a second chamber. The first chamber and the second chamber are connected.

[0042] In this implementation method, since the second valve body 210 is an integral structure, the processing, preparation, and installation of the second valve body 210 can be relatively simple.

[0043] In this implementation, the first space formed by the second valve body 210 and the drive assembly 220 includes the internal space of the extended portion 214 and the remaining space in the main body 213 excluding the space occupied by the drive assembly 220 and the valve seat 280. The second space inside the drive assembly 220 refers to the space between the various components inside the drive assembly 220. The second space can communicate with the first space to jointly form the pilot valve cavity of the pilot valve 200.

[0044] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A reversing valve, characterized in that, The system includes a main valve and a pilot valve. The main valve includes a first valve body and a first valve core component. The first valve core component is disposed in the first valve body. The inner cavity of the first valve body forms accommodating spaces on both axial sides of the first valve core component. After the first valve core component has reversed direction, the volume of the larger of the two accommodating spaces is the first volume, and the volume of the inner cavity of the pilot valve is the second volume. The volume ratio of the second volume to the first volume is greater than 1 / 15.

2. The reversing valve according to claim 1, characterized in that, The volume ratio of the second volume to the first volume is greater than 1 / 10.

3. The reversing valve according to claim 1 or 2, characterized in that, The pilot valve includes a second valve body and a drive assembly. The second valve body includes a second cylindrical portion and an extended sleeve. The second cylindrical portion includes a first end and a second end disposed opposite to each other. The extended sleeve is connected to the first end, and the drive assembly is connected to the second end.

4. The reversing valve according to claim 3, characterized in that, The extended sleeve is made of stainless steel and is welded to the first end.

5. The reversing valve according to claim 1 or 2, characterized in that, The drive assembly includes a sleeve portion, a plug head, and a drive component. The sleeve portion is connected to the second end, the plug head is installed at the end of the sleeve portion away from the second valve body, and a portion of the drive component is located inside the sleeve portion and can slide along the sleeve portion.

6. The reversing valve according to claim 1 or 2, characterized in that, The drive assembly includes a sleeve portion, a plug head, a drive component, and an elastic element. The elastic element is disposed between the drive component and the plug head. The sleeve portion is connected to the second end. The plug head is installed at the end of the sleeve portion away from the second valve body. A portion of the drive component is located inside the sleeve portion and is capable of sliding along the sleeve portion.

7. The reversing valve according to any one of claims 1-6, characterized in that, The drive assembly includes a sleeve portion, a plug head, a drive component, and an elastic element. The elastic element is disposed between the drive component and the plug head. The sleeve portion is connected to the second end. The plug head is installed at the end of the sleeve portion away from the second valve body. A portion of the drive component is located inside the sleeve portion and can slide along the sleeve portion. The pilot valve cavity includes a first space formed by the second valve body and the drive assembly, and a second space inside the drive assembly.

8. The reversing valve according to any one of claims 1-7, characterized in that, The pilot valve includes a second valve body, which includes a main body and an extended part. The main body has a first chamber, and the extended part has a second chamber. The first chamber and the second chamber are connected.

9. The reversing valve according to claim 8, characterized in that, The pilot valve further includes a second valve body and a high-pressure inlet pipe, the high-pressure inlet pipe and the second valve body being connected. The driving component includes a reversing valve block, the reversing valve block having a reversing space. The pilot valve includes a low-pressure outlet pipe, a first connecting pipe, and a second connecting pipe. The accommodating space includes a first accommodating space and a second accommodating space. The reversing valve block includes a first position and a second position. In the first position, the low-pressure outlet pipe, the first connecting pipe, and the first accommodating space are connected, as are the high-pressure inlet pipe, the pilot valve inner cavity, the second connecting pipe, and the second accommodating space. In the second position, the low-pressure outlet pipe, the second connecting pipe, and the second accommodating space are connected, as are the high-pressure inlet pipe, the pilot valve inner cavity, the first connecting pipe, and the first accommodating space.

10. The reversing valve according to claim 9, characterized in that, The first valve body includes a first cylindrical part and two end caps. The two end caps are respectively connected to the two axial ends of the first cylindrical part. The area between the two end caps and the first valve core component respectively forms the first accommodating space. In the first position, the reversing space is connected to the low-pressure outlet pipe and the first connecting pipe. In the second position, the reversing space is connected to the low-pressure outlet pipe and the second connecting pipe.

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