Solenoid valve with sight glass

Abstract

A solenoid valve with a sight glass (100). The solenoid valve with a sight glass (100) includes a valve body assembly (1), a solenoid assembly (50), and a sight glass (12), the valve body assembly (1) includes a valve seat (10), within the valve seat (10) is a valve chamber (15), the solenoid assembly (50) has a piston (56) with one end movable within the chamber of the valve seat (10), the piston (56) causes the fluid in the valve chamber (15) to maintain a flowing state or a blocked state, and the sight glass (12) is mounted on the valve seat (10) and is integral with the valve seat (10).

Description

[Technical field]

[0001] Related Applications This application claims priority to a Chinese patent application having application number 202220845339.1 and entitled "Solenoid Valve with Sight Glass" filed on April 13, 2022, and application number 202220843621.6 and entitled "Solenoid Valve with Sight Glass" filed on April 13, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of valves, and in particular to solenoid valves with sight glasses. [Background technology]

[0003] Sight glass is an important component in the cooling system circuit, and by using high-temperature sintering process of glass and steel components, the sight glass product has beautiful appearance, strong strength and high glass transparency, and the sight glass is used in various cooling equipment, compressors and other machines, and the working principle of the sight glass is to visually check the refrigerant in the system through a wide-angle viewing window, so that it is easy to observe the bubbles or flash gas in the system, and confirm whether the refrigerant dosage is appropriate or needs to be filled. The indicator element of the sight glass is highly sensitive to moisture and changes color according to the change of moisture content in the system.

[0004] However, in the prior art, the valve and sight glass used in the cooling system circuit are two separate products, and in the process of use, the valve and sight glass are connected in series and welded together, and then the entire assembly of the valve and sight glass that are connected in series and welded together needs to be welded to a pipeline, which requires a large number of welding points, a complicated process, and a large amount of space. Summary of the Invention

[0005] According to various embodiments of the present application, a solenoid valve with a sight glass is provided, which includes a valve body assembly, a solenoid assembly, and a sight glass.

[0006] The valve disc assembly includes a valve seat and within the valve seat is a valve chamber.

[0007] The electromagnetic assembly is a piston with one end movable within a chamber in the valve seat such that the piston maintains a flow or block state for the fluid within the valve chamber.

[0008] The sight glass is mounted to and integral with the valve seat.

[0009] In one embodiment, opposite ends of the valve seat are a liquid inlet and a liquid outlet, respectively, and a sight glass is provided at the liquid inlet or the liquid outlet.

[0010] In one embodiment, the sight chamber of the sight glass communicates with the valve chamber.

[0011] In one embodiment, the valve body assembly further includes a valve cover mounted on the valve seat, the valve chamber having a liquid inlet chamber and a liquid outlet chamber, and the valve seat is provided at opposite ends with a liquid inlet and a liquid outlet, respectively, communicating with the valve chamber.

[0012] A chamber is provided within the valve seat, and a valve port is provided at the upper end of the chamber, the liquid inlet chamber is a chamber from the liquid inlet to the valve port, the liquid outlet chamber is a chamber from the valve port to the liquid outlet, and the liquid inlet chamber is connected to the liquid outlet chamber via the valve port.

[0013] In one embodiment, the sight glass includes a base and a lens, the base having a sight chamber formed therein, the lens disposed within the base, the sight chamber communicating with the liquid outlet chamber and / or the liquid inlet chamber.

[0014] In one embodiment, a mounting holder is provided within the viewing chamber, and the mounting holder is used to hold the test strip.

[0015] In one embodiment, a first stepped surface is provided within the base and a second stepped surface is provided at an outer edge of the base, and the lens is mounted in a receiving space between the first stepped surface and the second stepped surface.

[0016] In one embodiment, there is a through hole at the bottom of the containing chamber, the through hole is connected to the liquid outlet, and the liquid outlet chamber is an L-shaped tubular space structure.

[0017] In one embodiment, an inlet is provided on a side of the sight glass closer to the liquid outlet and an outlet is provided on a side of the sight glass away from the liquid outlet, both of which communicate with the sight chamber and the inlet communicates with the liquid outlet.

[0018] In one embodiment, the liquid inlet, the liquid outlet, the inlet and the outlet axes are all collinear.

[0019] In one embodiment, the valve port faces the electromagnetic assembly such that when the valve port abuts against the piston, communication between the liquid outlet chamber and the liquid inlet chamber is blocked, and when the piston moves away from the valve port, the liquid outlet chamber is connected to the liquid inlet chamber.

[0020] In one embodiment, the electromagnetic assembly includes a fixed core, a first spring, a movable core, a second spring and a piston arranged in sequence toward the valve port, the fixed core, the first spring, the movable core and the second spring are arranged in a sleeve, and the piston is connected to the movable core via the second spring.

[0021] In one embodiment, the piston includes a transmission rod, an upper packing, a diaphragm, and a lower packing.

[0022] The upper and lower gaskets are rigid sheets, and the diaphragm is an elastic sheet. The upper gasket, diaphragm and lower gasket are arranged coaxially in that order at the end of the transmission rod close to the valve orifice along the direction toward the valve orifice, and the other end of the transmission rod away from the valve orifice abuts against a second spring.

[0023] In one embodiment, the diameter of the upper packing matches the outer diameter of the armature, the diameter of the lower packing is smaller than the inner diameter of the valve orifice, and the diameter of the diaphragm is larger than the outer diameter of the valve orifice.

[0024] In one embodiment, the edge of the diaphragm spans the valve seat and the edge of the diaphragm seals against the valve lid, forming a sealed chamber between the diaphragm and the valve lid.

[0025] The details of one or more embodiments of the application are set forth in the drawings and description below. Other features, objects, and advantages of the application will become apparent from the description, drawings, and claims. [Brief description of the drawings]

[0026] To better describe and explain the embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more drawings, in which additional details or examples used to explain the drawings should not be considered as limiting the scope of any of the disclosed inventions, the embodiments and / or examples described herein, and the best mode of these inventions as understood herein.

[0027] [Figure 1] FIG. 1 is a structural diagram of a solenoid valve with a sight glass according to one or more embodiments. [Figure 2A] FIG. 1 is a cross-sectional view of a solenoid valve with a sight glass according to one or more embodiments. [Figure 2B] FIG. 2B is a partially enlarged view of the cross-sectional view of the solenoid valve with a sight glass in FIG. 2A. [Diagram 3] FIG. 2 is a structural diagram of a valve seat and a sight glass of a solenoid valve with a sight glass according to one or more embodiments. [Figure 4] FIG. 1 is a cross-sectional view of a valve seat and a sight glass of a solenoid valve with a sight glass according to one or more embodiments. [Diagram 5] FIG. 1 is a structural diagram of a solenoid valve with a sight glass according to one or more embodiments. [Figure 6]FIG. 2 is a structural diagram of a valve seat in a solenoid valve with a sight glass according to one or more embodiments. [Figure 7] FIG. 1 illustrates a cross-sectional view of a solenoid valve with a sight glass according to one or more embodiments. [Figure 8] FIG. 1 is a vertical cross-sectional view of a solenoid valve with a sight glass according to one or more embodiments. [Figure 9] FIG. 9 is a partially enlarged view of the cross-sectional view of the solenoid valve with a sight glass in FIG. 8.

[0028] 100 Solenoid valve with sight glass, 1 valve body assembly, 15 valve chamber, 111 through hole, 10 valve seat, 11 accommodation chamber, 110 valve port, 12 sight glass, 121 lens, 122 base, 1220 sight glass, 1221 first step surface, 1222 second step surface, 123 inlet, 124 outlet, 125 mounting holder, 13 liquid inlet, 14 liquid outlet, 20 valve cover, 30 liquid inlet pipe, 40 liquid outlet pipe, 120 sight chamber, 130 liquid inlet chamber, 140 liquid outlet chamber, 50 solenoid assembly, 51 sleeve, 52 fixed core, 53 first spring, 54 movable core, 541 first accommodation chamber, 542 second accommodation chamber, 55 second spring, 56 piston, 561 transmission rod, 562 Upper packing, 563 diaphragm, 5631 sealing chamber, 564 lower packing, 565 pin, 57 support sheet. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] In order to make the above objects, features and advantages of the present application clearer and easier to understand, the following describes in detail the specific embodiments of the present application with reference to the drawings. In the following description, various specific details are described in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other aspects different from those described herein, and those skilled in the art can make similar improvements without going against the content of the present application, so the present application is not limited by the specific examples disclosed below.

[0030] In the description of this application, the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like, are based on the orientations or positional relationships shown in the drawings, and are intended merely to facilitate and simplify the description of this application, and do not indicate or imply that the devices or elements shown necessarily have a particular orientation and must be constructed and operated in a particular orientation, and should not be construed as limiting this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying a relative importance or as implicitly designating the number of technical features depicted, whereby a feature qualified with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "plurality" means two or more, unless expressly qualified.

[0032] In this application, unless otherwise specified and limited, the terms "attach", "connect to each other", "connect", "fix" and the like should be understood in a broad sense. For example, they may be fixedly connected, detachably connected, or integrally connected. They may be mechanically connected or electrically connected. They may be directly connected to each other, indirectly connected to each other via an intermediate member, or communicated inside the two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation.

[0033] In this application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact with each other, or that the first and second features are in indirect contact with each other through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply that the horizontal height of the first feature is lower than that of the second feature.

[0034] It should be explained that when an assembly is referred to as being "fixed" or "mounted" on another assembly, it may be directly fixed to the other assembly or there may be an intervening assembly present. When an assembly is referred to as being "connected" to another assembly, it may be directly connected to the other assembly or there may be an intervening assembly present at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for descriptive purposes only and do not represent the only embodiments.

[0035] 1, 2A and 5, which show the structure of the solenoid valve 100 with a sight glass in the embodiment of the present application, the solenoid valve 100 with a sight glass provided by the embodiment of the present application includes a valve body assembly 1, a sight glass 12 and an electromagnetic assembly 50. The sight glass 12, the valve body assembly 1 and the electromagnetic assembly 50 are integral and processed using an integral form.

[0036] The valve body assembly 1 includes a valve seat 10 and a valve cover 20 provided on the valve seat 10. A sealing member is further provided between the valve cover 20 and the valve seat 10 to prevent the medium in the valve seat 10 from flowing out through a gap between the valve cover 20 and the valve seat 10, thereby improving the sealing reliability of the valve body assembly 1. Optionally, the sealing member is made of a polytetrafluorone material, i.e., a polytetrafluoroethylene ring.

[0037] The above-mentioned solenoid valve 100 with sight glass has an integrated structure of the sight glass 12 and the valve seat 10, so that the state of the medium can be directly observed in the solenoid valve 100, which simplifies the assembly process, reduces the manufacturing cost, improves the degree of integration of the product, reduces the number of valve members used in the system, and simplifies the pipeline layout of the system.

[0038] 2B, 3, 6 and 7, a liquid inlet 13 and a liquid outlet 14 are provided at both ends of the valve seat 10, the liquid inlet 13 is connected to a liquid inlet pipe 30, and a valve chamber 15 is provided within the valve seat 10, the valve chamber 15 including a liquid outlet chamber 140 and a liquid inlet chamber 130. A chamber 11 is provided within the valve seat 10, the chamber 11 has a valve port 110 facing the valve cover 20, and a through hole 111 is provided at the bottom of the chamber 11, which is connected to the liquid outlet 14. The valve port 110 connects the liquid inlet 13 and the liquid outlet 14. The liquid outlet 14 is connected to the liquid outlet pipe 40, and the liquid inlet 13 is connected to the liquid inlet pipe 30. The valve chamber 15 from the liquid inlet 13 to the valve orifice 110 is the liquid inlet chamber 130, and the valve chamber 15 from the valve orifice 110 to the liquid outlet 14 is the liquid outlet chamber 140. By controlling the opening and closing of the valve orifice 110, the liquid inlet chamber 130 and the liquid outlet chamber 140 are connected / disconnected. The valve orifice 110 is fitted with an electromagnetic assembly 50, which controls the opening and closing state of the valve orifice 110. Alternatively, the valve seat 10 may be made of brass material having high ductility, or may be manufactured by a machining process using steel material.

[0039] In some embodiments, as shown in Figures 2A, 3 and 4, the sight glass 12 is provided at the end of the solenoid valve 100 with the sight glass. Specifically, the sight glass 12 is provided at the liquid outlet 14 or the liquid inlet 13. The sight glass 12 is integrated with the valve seat 10. In this embodiment, the sight glass 12 is provided at the liquid outlet 14, and the sight glass 12 has a cylindrical structure that opens upward as a whole, and the hollow space of the sight glass 12 is the sight chamber 120. An inlet 123 and an outlet 124 are provided on both sides of the sight glass 12, respectively, and the inlet 123 is connected to the liquid outlet 14, that is, the sight chamber 120 is connected to the liquid outlet chamber 140.

[0040] The sight glass 12 includes a base 122 and a lens 121 mounted in the base 122. The upper end of the sight glass 12 extends upward to form a ring-shaped base 122, and the intermediate space of the base 122 is a sight window 1220 communicating with the sight chamber 120. A first step surface 1221 is provided in the base 122, and a second step surface 1222 is provided on the outer edge of the base 122, and the lens 121 is mounted in the storage space between the first step surface 1221 and the second step surface 1222. The lens 121 allows the flow state of the medium in the sight chamber 120 and the liquid level of the medium to be directly observed, and thus confirms whether the amount of the medium needs to be filled. The lens 121 is mounted horizontally in the base 122, so that the lens 121 is mounted at an angle, which causes light refraction and makes it difficult to accurately determine the liquid level of the medium in the sight glass 12. The liquid outlet chamber 140 has an L-shaped tubular spatial structure, allowing the medium entering the liquid outlet chamber 140 to flow directly to the sight glass 12 along the liquid outlet chamber 140, thereby avoiding the medium entering a chamber with a different shape or a complex shape causing turbulence or vortex, which makes it difficult to observe the flow state of the medium through the sight glass 12.

[0041] In the present application, the sight glass 120 is provided at the liquid inlet 13 or liquid outlet 14 of the valve body assembly, so that the medium directly enters the sight glass 12 after leaving the liquid outlet chamber 140. The sight glass allows the flow of all fluids in the valve chamber to be observed, making it easier to observe the flow condition of the medium, reducing the flow rate detection error, and at the same time, the size of the sight glass 120 is not limited by the size of the valve body assembly 1.

[0042] The liquid inlet 13, the liquid outlet 14, the inlet 123 and the outlet 124 are arranged on the same axis, so that after the medium enters the sight glass 12, turbulence or vortex is not formed in the sight chamber 120, which makes it difficult to observe the flow state of the medium. The outlet 124 communicates with the liquid outlet pipe 40. The horizontal height of the lens 121 is equal to or less than the horizontal height of the valve cover 20, so that the entire structure of the present application is harmonious and has a beautiful and elegant appearance.

[0043] In some embodiments, as shown in Figures 6 and 8, the sight glass 12 is provided in the middle of the solenoid valve 100 with a sight glass. Specifically, the sight glass 12 includes a base 122 and a lens 121. The base 122 extends from the outer wall on one side of the valve seat 10 toward the outside. The base 122 has an observation window 1220 that is connected to the liquid inlet chamber 130. The observation chamber 120 is drilled inside the base 122. A first step surface 1221 is provided in the base 122. A second step surface 1222 is provided on the outer edge of the base. The lens 121 is attached to the first step surface 1221. The observation chamber 120 communicates with the liquid inlet chamber 130. Thus, the flow state of the medium, the liquid level of the medium in the valve body assembly 1, etc. can be directly observed through the lens 121 to check whether the amount of the medium is appropriate or needs to be filled.

[0044] By placing the sight glass 12 on the valve seat 10 and connecting the chamber of the sight glass 12 with the valve chamber 15, the balancing performance of the entire solenoid valve 100 is improved, the center of gravity is stabilized, and processing is facilitated. At the same time, a part of the housing of the sight glass 12 overlaps with a part of the housing of the solenoid valve 100, so that the housing of the solenoid valve 100 can support the housing of the sight glass 12, thereby reducing the weight of the product and saving costs.

[0045] Optionally, the lens 121 is mounted in the base 122 by caulking, and the edge of the base 122 is flanged toward the center of the lens 121 by an external force to ensure that the base 122 has a sufficient preload pressure on the lens 121, to prevent the lens 121 from being detached from the base 122, and to ensure the sealing of the viewing chamber 120. Optionally, the lens 121 is made of a glass material (e.g., soda-lime glass or high borosilicate glass) or other transparent materials in the field, such as a resin material. The lens 121 may be entirely transparent or partially transparent, and is not limited here.

[0046] Further, referring to Figures 8 and 9, in some embodiments, a mounting holder 125 is provided in the viewing chamber 120, and the mounting holder 125 is used to set a test paper, and the test paper can be directly observed through the lens 121, and the test paper is used to measure the moisture content in the medium, and the test paper will undergo corresponding color changes under different moisture contents of the medium, so that the moisture content of the medium can be roughly known.

[0047] 1, 2A and 2B, the valve orifice 110 has an opening facing the valve cover 20, a mounting hole is provided at a position of the valve cover 20 corresponding to the valve orifice 110, a sleeve 51 is provided in the mounting hole, one end of the sleeve 51 is provided facing the valve orifice 110, and the end of the sleeve 51 facing the valve orifice 110 is mounted in the mounting hole so that the inside of the sleeve 51 communicates with the valve chamber 15. Alternatively, a screw / bolt connection or the like is used at the point where the valve cover 20 and the valve seat 10 are engaged and butt-connected.

[0048] 2A, 2B and 8, the electromagnetic assembly 50 includes a piston 56 movably disposed within the valve seat 10. The piston 56 can control the opening and closing of the valve port 110. When the piston 56 abuts against the valve port 110, the liquid outlet chamber 140 and the liquid inlet chamber 130 are not in communication with each other, and when the piston 56 moves away from the valve port 110, the liquid outlet chamber 140 is in communication with the liquid inlet chamber 130.

[0049] The electromagnetic assembly 50 further includes a sleeve 51, and a fixed core 52, a first spring 53, a movable core 54, and a second spring 55 provided in this order from above inside the sleeve 51.

[0050] The fixed core 52 is fixed to one end of the sleeve 51 remote from the valve seat 10, and the movable core 54 can freely move toward or away from the fixed core 52 inside the sleeve 51, and when the fixed core 52 is in an electrically conductive state, the movable core 54 moves relative to the fixed core 52 and is attracted to the fixed core 52. The first spring 53 abuts between the fixed core 52 and the movable core 54, and an open first housing chamber 541 is provided at one end of the movable core 54 facing the fixed core 52. In a natural state, a portion of the first spring 53 is housed within the first housing chamber 541, and the first housing chamber 541 plays a role of guiding the expansion and contraction of the first spring 53, thereby preventing the first spring 53 from rattling in the radial direction of the sleeve 51. When the movable core 54 moves toward the fixed core 52 until it abuts against the fixed core 52, the first spring 53 is gradually compressed until it is completely housed in the first housing chamber 541. One end of the second spring 55 abuts against the movable core 54, and the other end extends outside the sleeve 51 and abuts against the piston 56. One end of the movable core 54 facing the valve port 110 has an open second housing chamber 542, and the second spring 55 is partly housed in this second housing chamber 542 in the natural state. When the movable core 54 moves away from the fixed core 52 until it abuts against the piston 56, the second spring 55 is gradually compressed until it is completely housed in the second housing chamber 542. Since the elastic coefficient of the second spring 55 is smaller than that of the first spring 53, when the fixed iron core 52 is in an electrical outage state, the first spring 53 acts on the movable iron core 54 to compress the second spring 55 into the second accommodating chamber 542, and the movable iron core 54 abuts against the piston 56 to move the piston 56 to the valve port 110, and the piston 56 seals the valve port 110, and communication between the liquid inlet chamber 130 and the liquid outlet chamber 140 is cut off.

[0051] Specifically, after the fixed core 52 is energized and generates a magnetic force, when the magnetic force received by the movable core 54 becomes greater than the elastic force of the first spring 53, the movable core 54 moves toward the fixed core 52 until it abuts against the fixed core 52, and when the pressure of the medium in the liquid inlet chamber 130 becomes greater than the threshold value, the piston 56 compresses the second spring 55 under the action of the pressure of the medium in the liquid inlet chamber 130 and moves away from the valve port 110, and the liquid inlet chamber 130 communicates with the liquid outlet chamber 140. When the fixed core 52 is in an out-of-electricity state, the fixed core 52 loses its magnetic force, and the movable core 54 receives the acting force of the first spring 53 and moves toward the piston 56 until it abuts against the piston 56, and when the piston 56 is pressed and moved toward the valve port 110 until it abuts against the valve port 110, the liquid inlet chamber 130 and the liquid outlet chamber 140 are disconnected from each other.

[0052] 2A, 2B, 8 and 9, the piston 56 is a diaphragm type piston, which includes a transmission rod 561, an upper packing 562, a diaphragm 563 and a lower packing 564. The upper packing 562, the diaphragm 563 and the lower packing 564 are sequentially and coaxially arranged at an end of the transmission rod 561 close to the valve port 110 along a direction toward the valve port 110. A pin 565 passes through the lower packing 564, the diaphragm 563 and the upper packing 562 in order to fix the lower packing 564, the diaphragm 563 and the upper packing 562 to the end of the transmission rod 561. The other end of the transmission rod 561 away from the valve port 110 abuts against the second spring 55, the diameter of the upper packing 562 is adapted to the outer diameter of the movable iron core 54, and the diameter of the lower packing 564 is smaller than the inner diameter of the valve port 110, so that the lower packing 564 can be easily accommodated in the valve port 110 when the diaphragm 563 abuts against the valve port 110, and the diameter of the diaphragm 563 is larger than the outer diameter of the valve port 110, so that the diaphragm 563 can adequately close the valve port 110. The upper packing 562 and the lower packing 564 are rigid sheets, and the diaphragm 563 is an elastic sheet, and the upper packing 562 and the lower packing 564 sandwich the diaphragm 563 to prevent the diaphragm 563 from being excessively deformed.

[0053] More specifically, after the fixed core 52 is energized and magnetic force is generated, the movable core 54 overcomes the elastic force of the first spring 53 in response to the magnetic force and moves toward the fixed core 52 until it abuts against the fixed core 52, and after the pressure of the medium in the liquid inlet chamber 130 becomes greater than a threshold value, the diaphragm 563 deforms and moves the piston away from the valve port 110, and the liquid inlet chamber 130 communicates with the liquid outlet chamber 140. When the fixed core 52 is in an electrically depleted state, the fixed core 52 loses its magnetic force, the movable core 54 moves toward the piston 56 under the action of the elastic force of the first spring 53, the second spring 55 is forced to be completely accommodated in the second accommodating chamber 542 at the lower end of the movable core 54, the movable core 54 directly abuts against the upper gasket 562, and the diaphragm 563 is driven by the upper gasket 562 to move toward the valve port 110 until it comes into close contact with the valve port 110, and communication between the liquid inlet chamber 130 and the liquid outlet chamber 140 is cut off.

[0054] As shown in Figures 2A, 2B, 8 and 9, the edge of the diaphragm 563 spans the valve seat 10 and is in close contact with the valve cover 20, forming a sealed chamber 5631 between the diaphragm 563 and the valve cover 20, blocking the medium in the valve seat 10 from contacting the components in the sleeve 51 and preventing the electromagnetic assembly 50 from being eroded by the medium. Optionally, the material of the diaphragm 563 is a metal material, and the metal material of the diaphragm 563 is stainless steel or manganese steel, which improves the strength of the pressure that the diaphragm 563 receives at the valve port 110. The surface of the diaphragm 563 is further coated with a sealing coating layer, which is a non-metallic coating layer, thereby improving the sealing property of the diaphragm 563 and reducing its leakage rate. Optionally, the non-metallic coating layer can be either a Teflon coating layer or a silicone rubber coating layer.

[0055] As shown in Figures 2A, 2B and 9, an annular support sheet 57 is provided below the diaphragm 563, and the support sheet 57 is a rigid sheet. The inner diameter of the support sheet 57 is larger than the outer diameter of the valve port 110, and the outer diameter of the support sheet 57 is compatible with the diameter of the diaphragm 563. There is a certain distance between the support sheet 57 and the diaphragm 563, so as to accommodate the deformation distance of the diaphragm 563 and play a supporting role for the diaphragm 563 when it is deformed, thereby avoiding the diaphragm 563 from being excessively deformed and damaged. The support sheet 57 is provided with several perforations for the passage of the medium.

[0056] Each of the technical features of the above-mentioned embodiments may be combined in any combination. For the sake of brevity, not all possible combinations of each of the technical features in the above-mentioned embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, all of them should be considered within the scope described in this specification.

[0057] The above examples merely show some embodiments of the present application, and although the description is relatively specific and detailed, it should not be understood as limiting the scope of the claims of the present application. It should be noted that those skilled in the art can make some modifications and improvements without departing from the spirit of the present application, all of which are within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the scope of the attached claims.

Claims

1. A valve body assembly, a solenoid assembly and a sight glass are included. The valve body assembly includes a valve seat, and a valve chamber within the valve seat; the electromagnetic assembly being a piston having one end movable within a chamber of the valve seat, the piston causing the fluid in the valve chamber to maintain a flowing or blocked state; A solenoid valve with a sight glass, wherein the sight glass is provided on the valve seat and is integral with the valve seat.

2. 2. The solenoid valve with a sight glass as described in claim 1, wherein both ends of the valve seat are a liquid inlet and a liquid outlet, respectively, and the sight glass is provided at the liquid inlet or the liquid outlet.

3. 2. The solenoid valve with a sight glass as claimed in claim 1, wherein the sight chamber of said sight glass communicates with said valve chamber.

4. The valve body assembly further includes a valve cover provided on the valve seat, the valve chamber having a liquid inlet chamber and a liquid outlet chamber, and a liquid inlet and a liquid outlet are provided at both ends of the valve seat, the liquid inlet and the liquid outlet communicating with the valve chamber, respectively; 4. An electromagnetic valve with a sight glass as described in claim 2 or 3, wherein a storage chamber is provided within the valve seat, a valve port is provided at an upper end of the storage chamber, the liquid inlet chamber is a chamber from the liquid inlet to the valve port, the liquid outlet chamber is a chamber from the valve port to the liquid outlet, and the liquid inlet chamber is connected to the liquid outlet chamber via the valve port.

5. 5. The solenoid valve with a sight glass as described in claim 4, wherein the sight glass includes a base and a lens, a sight chamber is provided within the base, the lens is provided within the base, and the sight chamber is in communication with the liquid outlet chamber and / or the liquid inlet chamber.

6. 6. The solenoid valve with a sight glass according to claim 5, wherein a mounting holder is provided in the sight chamber, and the mounting holder is used for setting a test paper.

7. 6. An electromagnetic valve with a sight glass as described in claim 5, wherein a first step surface is provided within the base, a second step surface is provided on the outer edge of the base, and the lens is attached to an accommodating space between the first step surface and the second step surface.

8. a through hole is provided at a bottom of the storage chamber, the through hole being in communication with the liquid outlet; 5. The solenoid valve with a sight glass as claimed in claim 4, wherein the liquid outlet chamber is an L-shaped tubular space structure.

9. 6. An electromagnetic valve with a sight glass as described in claim 5, wherein an inlet is provided on a side of the sight glass closer to the liquid outlet and an outlet is provided on a side of the sight glass away from the liquid outlet, the inlet and the outlet both communicate with the sight chamber, and the inlet communicates with the liquid outlet.

10. 9. The solenoid valve with a sight glass as described in claim 8, wherein the liquid inlet, the liquid outlet, and the axes of the inlet and the outlet are all on the same straight line.

11. 5. The solenoid valve with a sight glass as described in claim 4, wherein the valve port faces the solenoid assembly, and when the valve port abuts against the piston, communication between the liquid outlet chamber and the liquid inlet chamber is blocked, and when the piston moves away from the valve port, the liquid outlet chamber is connected to the liquid inlet chamber.

12. 12. The solenoid valve with a sight glass as described in claim 11, wherein the electromagnetic assembly includes a fixed core, a first spring, a movable core, a second spring and a piston arranged in order toward the valve port, the fixed core, the first spring, the movable core and the second spring being arranged in a sleeve, and the piston being connected to the movable core via the second spring.

13. The piston includes a transmission rod, an upper packing, a diaphragm, and a lower packing; 13. An electromagnetic valve with a sight glass as described in claim 12, wherein the upper gasket and the lower gasket are rigid sheets, the diaphragm is an elastic sheet, the upper gasket, the diaphragm and the lower gasket are coaxially arranged in order at the end of the transmission rod close to the valve port along the direction toward the valve port, and the other end of the transmission rod away from the valve port abuts against the second spring.

14. The diameter of the upper packing is adapted to the outer diameter of the movable core; The diameter of the lower packing is smaller than the inner diameter of the valve port, 14. The solenoid valve with a sight glass as described in claim 13, wherein the diameter of the diaphragm is larger than the outer diameter of the valve port.

15. 14. The solenoid valve with a sight glass as described in claim 13, wherein the edge of the diaphragm is bridged over the valve seat and is in close contact with the valve cover, thereby forming a sealed chamber between the diaphragm and the valve cover.

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