A high-sealing three-way electromagnetic valve and use thereof

Abstract

The application discloses a high-sealing three-way electromagnetic valve and application, and the electromagnetic valve comprises a valve body, a valve seat, a valve core and an electromagnetic driving mechanism, the valve seat is arranged in the valve body, the valve seat is provided with at least one through sliding hole, and a valve seat flow channel connected with a second fluid outlet is arranged on the side wall of the through sliding hole; the valve core comprises a first core body and a second core body with a larger cross section, and a second end surface surrounding the first core body is formed at the position with the larger cross section; the first core body of the valve core is axially and freely slidably arranged in the axial through sliding hole, a first sealing surface is formed between the outer surface of the first core body and the inner surface of the axial through sliding hole, and a second sealing surface is formed when the first end surface and the second end surface are in contact; the electromagnetic driving mechanism drives the valve core to move axially along the through sliding hole, and the valve position is switched. The application can be applied to a hot gas bypass valve of a refrigeration system, the function of two valves is replaced by one valve, and the application has high sealing performance and the ability of preventing impurities from being blocked.

Description

Technical Field

[0001] This invention belongs to the field of fluid control components, and relates to an electromagnetic control valve, particularly a high-sealing three-way electromagnetic valve and its application. Background Technology

[0002] In temperature control equipment, various electrically controlled valves are required to control the flow of the working fluid. Solenoid valves are the most commonly used due to their simple interface and rapid response. Currently, refrigeration equipment is constantly evolving towards miniaturization and high precision. To meet these new equipment requirements, high demands are placed on the performance of solenoid valves, especially higher reliability and lower internal leakage.

[0003] In refrigeration systems, to achieve high-precision temperature control and ensure the safety of compressor operation under low load conditions, a hot gas bypass valve is generally installed. Currently, in most small and medium-sized refrigeration systems, the hot gas bypass valve is used independently, with the solenoid valve at the compressor outlet alternately connected to the bypass valve. This ensures that the low-pressure system at the compressor inlet is always kept above the safety line, improving the compressor's operational stability under low load and thus extending the service life of the refrigeration system. However, alternating connection is complex to control, as the switching between the solenoid valve and the bypass valve has strict sequential requirements; logical errors can affect equipment stability. Furthermore, it is costly, requiring two sets of valves. Therefore, using a single valve to achieve both bypass and direct-flow control would greatly reduce control difficulty and save costs. Summary of the Invention

[0004] The purpose of this invention is to address some of the problems in the background technology by providing a high-sealing three-way solenoid valve that can be used as an integrated hot gas bypass valve in a refrigeration system, and also has very good sealing performance, which can effectively prevent impurities from jamming the valve core.

[0005] To address the above design requirements, the following technical solution is adopted:

[0006] A high-sealing three-way solenoid valve, comprising:

[0007] The valve body, which carries the entire solenoid valve, has three fluid ports: one fluid inlet and two fluid outlets.

[0008] A valve seat is disposed in the valve body. The valve seat is provided with at least one through-hole. One end of the through-hole is configured as an inlet end communicating with the fluid inlet, and the other end is configured as an outlet end communicating with the first fluid outlet. The outlet end of the through-hole is provided with a first end face for contact sealing. The sidewall of the through-hole is provided with a valve seat flow channel communicating with the second fluid outlet.

[0009] The valve core includes a first core and a second core with an enlarged cross-section, and a second end face is formed around the first core at the enlarged cross-section. An axial valve core flow channel is provided in the first core, and the end of the valve core flow channel away from the second core is configured as an open end as a fluid inlet. The first core is provided with at least two distribution channels that extend to the valve core flow channel.

[0010] The first core of the valve core is axially slidably installed in the axially penetrating slide hole, forming a first sealing surface on the outer surface of the first core and the inner surface of the axially penetrating slide hole, and forming a second sealing surface when the first end face and the second end face are in contact.

[0011] An electromagnetic drive mechanism is used to drive the valve core to move axially along the through-hole to switch valve positions. When in the bypass position, the second end face of the valve core contacts the first end face of the valve seat to form a second sealing surface. The flow channel of the valve core is aligned with the flow channel of the valve seat through at least one distribution channel and is connected to the second fluid outlet through the flow channel of the valve seat. The remaining distribution channels are sealed by the first and second sealing surfaces. When in the through position, the second end face of the valve core is disengaged from the first end face of the valve seat to form a gap. The flow channel of the valve core is connected to the gap through at least one distribution channel and is connected to the first fluid outlet through the gap.

[0012] The fluid enters the valve core flow channel of the first core through the fluid inlet, and then alternately connects to the two fluid outlets through the first and second distribution channels on the side wall of the valve core flow channel, realizing a three-way function and forming a straight-through position and a bypass position. The straight-through position can be used to send the high-pressure steam from the compressor outlet to the condenser, and after condensation, it enters the evaporator as a heat exchange medium for refrigeration. The bypass position directly bypasses the high-pressure steam from the compressor outlet to the compressor inlet, enabling the refrigeration system to operate at ultra-low load without starting or stopping the compressor, and also providing protection for compressor start-up and shutdown.

[0013] Compared with existing technologies, this solution has the following advantages and beneficial effects:

[0014] This device features a double seal between the valve core and the valve body. One seal is a planar seal formed by the end face between the large and small cylinders of the valve core and the end face of the valve seat; the other seal is a circumferential seal formed by the circumferential surface of the small cylinder and the inner wall of the through-hole on the valve seat. Additionally, a small circumferential hole (second distribution channel) at the left end of the small cylinder of the valve core corresponds to a second branch pipe, which serves as a bypass pipe. When the valve core is at its left end stop position, the bypass pipe communicates with the second distribution channel, and the bypass passage is open. When the valve core is at its right end stop position, the bypass passage is closed, the first distribution channel disengages from the inner wall of the through-hole on the valve seat, and the valve core flow channel within the valve core communicates with the first branch pipe through the first distribution channel, achieving alternating opening and closing of the two channels. This invention also provides high sealing performance and effectively prevents impurities from clogging and jamming the valve core. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a high-sealing three-way solenoid valve.

[0016] Figure 2 yes Figure 1 A magnified view of a portion of the middle section.

[0017] Figure 3 This is a three-dimensional schematic diagram of the valve seat.

[0018] Figure 4 This is a schematic diagram of the valve seat in a transverse section.

[0019] Figure 5 This is a 3D schematic diagram of the valve core.

[0020] Figure 6 This is a schematic diagram of a high-sealing three-way solenoid valve in the bypass position.

[0021] Figure 7 This is a schematic diagram of a high-sealing three-way solenoid valve in the straight-through position.

[0022] 100-Valve body, 110-Main pipe, 111-Main pipe body, 112-Main pipe closed end, 113-Inlet space, 114-Outlet space, 120-First branch pipe, 130-Second branch pipe, 101-Fluid inlet, 102-First fluid outlet, 103-Second fluid outlet;

[0023] 200-Valve seat, 210-Through-type sliding hole, 220-First end face, 230-Inlet end, 240-Outlet end, 250-Valve seat flow channel, 251-Radial flow channel, 252-Annular flow channel, 253-Outlet flow channel, 260-Support ring;

[0024] 300-valve core, 310-first core, 320-second core, 330-valve core flow channel, 340-first distribution flow channel, 350-second distribution flow channel, 360-second end face, 400-electromagnetic drive mechanism, 410-electromagnet, 420-spring; 500-gap. Detailed Implementation

[0025] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0026] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] The following is a further explanation with reference to the accompanying drawings.

[0028] like Figure 1 As shown, the present invention provides a high-sealing three-way solenoid valve, comprising:

[0029] The valve body 100 is used to support the entire solenoid valve and has three fluid ports, namely one fluid inlet 101 and two fluid outlets;

[0030] A valve seat 200 is disposed within a valve body 100. The valve seat 200 is provided with at least one through-hole 210. One end of the through-hole is configured as an inlet end 230 communicating with a fluid inlet 101, and the other end is configured as an outlet end 240 communicating with a first fluid outlet 102. The outlet end 240 of the through-hole is provided with a first end face 220 for contact sealing. The sidewall of the through-hole 210 has a valve seat flow channel 250 communicating with a second fluid outlet 103.

[0031] The valve core 300 includes a first core 310 and a second core 320 with an enlarged cross-section, and a second end face 360 ​​is formed around the first core 310 at the enlarged cross-section. An axial valve core flow channel 330 is provided inside the first core 310. One end of the valve core flow channel 330 away from the second core 320 is configured as an open end serving as a fluid inlet 101, and the other end is configured as a closed end. The first core 310 is provided with at least two distribution channels that extend to the valve core flow channel 330.

[0032] The first core 310 of the valve core 300 is axially slidably installed in the axially penetrating slide hole 210, forming a first sealing surface on the outer surface of the first core 310 and the inner surface of the axially penetrating slide hole 210, and forming a second sealing surface when the first end face 220 and the second end face 360 ​​are in contact.

[0033] The electromagnetic drive mechanism is used to drive the valve core 300 to move axially along the through-hole 210 to switch the valve position. When in the bypass position, such as Figure 6As shown, the second end face 360 ​​of the valve core 300 contacts the first end face 220 of the valve seat 200 to form a second sealing surface. Fluid in the valve core flow channel 330 aligns with the valve seat flow channel 250 through at least one distribution channel, and communicates with the second fluid outlet 103 through the valve seat flow channel 250. The remaining distribution channels are sealed by the first and second sealing surfaces. When in the straight-through position, as... Figure 7 As shown, the second end face 360 ​​of the valve core 300 disengages from the first end face 220 of the valve seat 200, forming a gap 500. The valve core flow channel 330 communicates with the gap 500 through at least one distribution flow channel, and communicates with the first fluid outlet 102 through the gap 500. This allows the fluid entering through the fluid inlet 101 to alternately communicate with the two fluid outlets through the valve core flow channel in the first core 310.

[0034] The distribution channels include a first distribution channel 340 and a second distribution channel 350, which are formed on the side wall of the first core 310 and penetrate the valve core channel 330. By selecting the positions of the first distribution channel 340 and the second distribution channel 350, when in the through position, the first distribution channel 340 is connected to the first fluid outlet 102 through the outlet end 240 of the through-hole 210, and the second distribution channel 350 is sealed by the first sealing surface; when in the bypass position, the first distribution channel 340 is double-sealed by the first sealing surface and the second sealing surface, and the second distribution channel 350 is connected to the first fluid outlet 102 through the valve seat channel 250.

[0035] Fluid enters the valve core flow channel 330 of the first core 310 from the fluid inlet 101, and then alternately connects to two fluid outlets through the first distribution channel 340 and the second distribution channel 350 on the side wall of the valve core flow channel 330, realizing a three-way function and forming a straight-through position and a bypass position. The straight-through position can be used to send the high-pressure steam from the compressor outlet to the condenser, and after condensation, it enters the evaporator as a heat exchange medium for refrigeration. The bypass position directly bypasses the high-pressure steam from the compressor outlet to the compressor inlet, enabling the refrigeration system to operate at ultra-low load without starting or stopping the compressor, and also providing protection for compressor start-up and shutdown.

[0036] In addition, the first sealing surface of the present invention is formed by contact between the outer surface of the first core 310 and the inner surface of the valve seat flow channel 250, resulting in a large sealing area and good sealing performance. Especially when the valve is in the bypass position, the first fluid outlet 102 is also sealed by the first sealing surface and the second sealing surface arranged in series, which greatly improves the sealing performance and reduces leakage.

[0037] Furthermore, the sealing and fluid flow direction of this invention are completely different from those in the prior art. In this invention, the fluid direction within the valve core flow channel 330 is along the axial direction of the valve core 300. When entering the two fluid outlets, the flow direction within the first distribution channel 340 and the second distribution channel 350 is perpendicular to the fluid direction within the valve core flow channel 330. This makes it difficult for impurities carried by the fluid within the valve core flow channel 330 to enter the first distribution channel 340 or the second distribution channel 350. Additionally, the fluid within the valve core flow channel 330 moves axially, ultimately impacting the closed end and then returning. The backflow process causes significant fluid turbulence, forming eddies and backflows. Since the cross-sectional area of ​​the valve core flow channel 330 is definitely larger than that of the first distribution channel 340 or the second distribution channel 350, the eddies and backflows can flush out impurities entering the first distribution channel 340 or the second distribution channel 350 from the valve core flow channel 330. Technically, this prevents impurities from remaining and accumulating in the valve core flow channel 330, and further prevents impurities from accumulating at the inlet of the first distribution channel 340 or the second distribution channel 350, thus avoiding valve jamming or stuckness, preventing normal opening, closing, and switching. Therefore, this invention not only has the advantages of a bypass-through switching integrated valve, but also has good sealing performance; after the through position is cut off, there is virtually no leakage. More importantly, this invention can prevent impurities carried in the fluid from clogging the valve core 300, thus avoiding problems such as poor sealing or even valve core 300 jamming.

[0038] For example, such as Figure 1 , Figure 2 and Figure 5 As shown, the first core 310 and the second core 320 are both cylinders. The first distribution channel 340 is a plurality of radial through holes provided on the same cross-section of the first core 310. The second distribution channel 350 is also a plurality of radial through holes provided on the same cross-section of the first core 310.

[0039] It should be noted that the first core 310 and the second core 320 can be manufactured separately and then fixedly connected, or they can be manufactured as a whole. The specific manufacturing method does not affect the technical problem solved by the present invention.

[0040] It should be noted that the first core 310 and the second core 320 can also be set to elliptical or square cross-sections, and the cross-sectional shape of the through-hole 210 on the valve seat 200 can be matched accordingly.

[0041] In a preferred embodiment, the axial distance h1 between the first distribution channel 340 and the second distribution channel 350 is less than the axial distance h2 between the valve seat channel 250 and its second end. By limiting this distance, it is ensured that when the first distribution channel 340 is separated from the first sealing surface, the second distribution channel 350 can definitely be sealed by the first sealing surface.

[0042] In a preferred embodiment, the axial distance between the second distribution channel 350 and the second end face 360 ​​is equal to the axial distance between the valve seat channel 250 and the first end face 220. By limiting the position, it is ensured that when the first end face 220 and the second end face 360 ​​contact to form the second sealing surface, the second distribution channel 350 and the valve seat channel 250 are aligned, so that the resistance of fluid entering the second fluid outlet 103 is minimized.

[0043] For example, such as Figure 1 As shown, the valve body 100 consists of a main pipe 110 and two branch pipes disposed on the main pipe 110; the valve seat 200 is installed in the main pipe 110 and divides it into an inlet space 113 and an outlet space 114 along the axial direction. The inlet space 113 is configured as an inlet pipe serving as a fluid inlet 101, and the outlet space 114 is configured with two fluid outlets respectively connected to the two branch pipes.

[0044] It should be noted that the connection between the main pipe 110 and the branch pipe is not limited; they can be integrally cast or assembled by welding.

[0045] It should be noted that the shape of the valve seat 200 is not limited, as long as it has a through-hole 210 and a first end face 220 at one end. For example, Figure 3 As shown, the valve seat 200 is a circular tube. The circular tube is welded to the inner wall of the main pipe 110 around the inlet end 230. Alternatively, the circular tube is provided with a support ring 260 with an increased diameter around the inlet end 230. The support ring is welded to the inner wall of the main pipe 110. Or, a corresponding fixing ring is also provided on the inner wall of the main pipe 110 (this case is not shown in the figure). The support ring is fixed to the fixing ring with screws. By making the valve seat 200 a circular tube, it is easier to manufacture and install, and it is more convenient to create a first end face 220 for forming a sealing surface at the end.

[0046] As a preferred embodiment, the end of the main pipe 110 near the outlet space 114 is configured as a closed end, namely the main pipe closed end 112. By configuring it as a closed end, the sealing problem of the outlet space 114 is solved, and the movement space of the valve core 300 is also provided.

[0047] For example, such as Figure 4 As shown, the valve seat flow channel 250 includes a radial flow channel 251 (four in this embodiment, but the actual number is not limited and can be designed according to actual size and requirements) that can be connected to the second distribution flow channel 350 on the first core 310, an annular flow channel 252 that connects each radial flow channel 251, and an outlet flow channel 253 that connects the annular flow channel 252 to the second fluid outlet 103 on the valve body 100. By setting a series of complex flow channels, the linear resistance can be bypassed.

[0048] As a preferred embodiment, the implementation of the electromagnetic drive mechanism is not limited. Electromagnetic drive ensures that the drive mechanism does not contact the valve core 300, thus avoiding the presence of a dynamic seal on the valve body 100, greatly improving sealing performance and preventing leakage. The electromagnetic drive mechanism itself is not limited in its design, as long as it can drive two valve position changes. For example, two electromagnets 410 can be alternately energized to switch the valve core 300 between two positions. Of course, the valve core 300 also has a corresponding ferromagnet that cooperates with the electromagnets 410. The shape and size of the ferromagnet are not limited, as long as it can generate a sufficient magnetic force and its direction is consistent with the movement direction of the valve core 300. As an example, in this embodiment, the electromagnetic drive mechanism can use an electromagnet 410 for driving the valve core 300 and a reset elastic element for resetting the valve core 300. By utilizing the reset elastic element and the electromagnet 410, the valve core 300 can be in a safe valve position when power is off, thus improving safety redundancy.

[0049] For example, such as Figure 1 As shown, the second core 320 of the valve core 300 is installed inside the closed end of the main pipe 110; the reset elastic element is a spring 420 located between the second core 320 and the closed end of the main pipe 110; the electromagnet 410 is an electromagnetic coil installed outside the closed end 112 of the main pipe. Of course, as a basic common sense, the valve core 300, especially the second core 320, should be provided with a corresponding ferromagnet. The technology here is a very mature technology of commonly used solenoid valves, and will not be described in detail in this invention.

[0050] As a preferred embodiment, such as Figure 6 As shown, the main pipe 110 adopts a split design, that is, the main pipe closed end 112 and the main pipe body 111 are connected by a detachable structure. This design can reduce the manufacturing difficulty of the solenoid valve. During manufacturing, the main pipe closed end 112 can be opened to assemble the valve core 300 and install the spring 420, and then the main pipe closed end 112 can be connected to complete the assembly of the entire solenoid valve. The main pipe closed end 112 and the main pipe body 111 can be connected by welding or by thread. Even with the threaded connection, it is a static seal and does not affect the overall sealing performance of the solenoid valve.

[0051] As an example, the sealing three-way solenoid valve of the present invention can be used as a hot gas bypass valve in a refrigeration compression system. Specifically, it is installed at the compressor outlet of the refrigeration system, i.e., the compressor outlet is connected to the inlet pipe of the high-sealing three-way solenoid valve via a high-pressure steam pipe. The first branch pipe 120 of the high-sealing three-way solenoid valve serves as a straight-through outlet connected to the cooler inlet, and the second branch pipe 130 serves as a bypass outlet connected to the compressor inlet. When the refrigeration compressor is operating normally, the high-sealing three-way solenoid valve is in the straight-through position, and the bypass position is cut off. Figure 7As shown, when the refrigeration system is under extremely low load (the residual refrigerant in the system can maintain a low load for a period of time), or in standby mode, or when the evaporator malfunctions, the compressor inlet pressure is extremely low, lower than the design value, affecting the compressor's operational stability. At this time, the system is switched to the bypass position via an electromagnetic drive mechanism, such as... Figure 6 As shown, the compressor outlet gas is introduced into the compressor inlet to temporarily maintain compressor operation; when the refrigeration system returns to normal, the high-sealing three-way solenoid valve is switched to the straight-through position again to allow the refrigeration system to operate normally.

[0052] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.

Claims

1. A high-sealing three-way solenoid valve, characterized in that, include: The valve body, which carries the entire solenoid valve, has three fluid ports: one fluid inlet and two fluid outlets. A valve seat is disposed in the valve body. The valve seat is provided with at least one through-hole. One end of the through-hole is configured as an inlet end communicating with the fluid inlet, and the other end is configured as an outlet end communicating with the first fluid outlet. The outlet end of the through-hole is provided with a first end face for contact sealing. The sidewall of the through-hole is provided with a valve seat flow channel communicating with the second fluid outlet. The valve core includes a first core and a second core with an enlarged cross-section, and a second end face is formed around the first core at the enlarged cross-section. An axial valve core flow channel is provided in the first core, and the end of the valve core flow channel away from the second core is configured as an open end as a fluid inlet. The first core is provided with at least two distribution channels that extend to the valve core flow channel. The first core of the valve core is axially slidably installed in the axially penetrating slide hole, forming a first sealing surface on the outer surface of the first core and the inner surface of the axially penetrating slide hole, and forming a second sealing surface when the first end face and the second end face are in contact. An electromagnetic drive mechanism is used to drive the valve core to move axially along the through-hole to switch valve positions. When in the bypass position, the second end face of the valve core contacts the first end face of the valve seat to form a second sealing surface. The flow channel of the valve core is aligned with the flow channel of the valve seat through at least one distribution channel and is connected to the second fluid outlet through the flow channel of the valve seat. The remaining distribution channels are sealed by the first and second sealing surfaces. When in the through position, the second end face of the valve core is disengaged from the first end face of the valve seat to form a gap. The flow channel of the valve core is connected to the gap through at least one distribution channel and is connected to the first fluid outlet through the gap. The distribution channel includes a first distribution channel and a second distribution channel. By selecting the positions of the first distribution channel and the second distribution channel, when in the straight-through position, the first distribution channel is connected to the first fluid outlet through the outlet end of the through-hole, and the second distribution channel is sealed by the first sealing surface; when in the bypass position, the first distribution channel is doubly sealed by the first sealing surface and the second sealing surface, and the second distribution channel is connected to the first fluid outlet through the valve seat channel.

2. The high-sealing three-way solenoid valve according to claim 1, characterized in that: The first distribution channel includes a plurality of radial through holes disposed on the same cross section of the first core; the second distribution channel also includes a plurality of radial through holes disposed on the same cross section of the first core.

3. The high-sealing three-way solenoid valve according to claim 1, characterized in that: The axial distance between the first distribution channel and the second distribution channel is less than the axial distance between the valve seat channel and its outlet end.

4. The high-sealing three-way solenoid valve according to claim 1, characterized in that: The axial distance between the second distribution channel and the second end face is equal to the axial distance between the valve seat channel and the first end face.

5. The high-sealing three-way solenoid valve according to claim 1, characterized in that: The valve body consists of a main pipe and two branch pipes configured on the main pipe; the valve seat is installed inside the main pipe and divides it into an inlet space and an outlet space along the axial direction. The inlet space is configured as an inlet pipe that serves as a fluid inlet, and the outlet space is configured with two fluid outlets that are respectively connected to the two branch pipes.

6. The high-sealing three-way solenoid valve according to claim 5, characterized in that: The electromagnetic drive mechanism includes an electromagnet for driving the valve core movement and a reset elastic element for resetting the valve core.

7. The high-sealing three-way solenoid valve according to claim 6, characterized in that: The end of the main pipe near the outlet space is configured as a closed end, and the second core of the valve core is installed inside the closed end of the main pipe; the reset elastic element is a spring located between the second core and the closed end of the main pipe, and the electromagnet is an electromagnetic coil installed outside the closed end of the main pipe.

8. The high-sealing three-way solenoid valve according to claim 7, characterized in that: The closed end is connected to the main body of the main tube using a detachable structure.

9. The use of the high-sealing three-way solenoid valve according to any one of claims 1-8, characterized in that, Hot gas bypass valve for refrigeration compression systems.

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