CN219453036U - Pilot-operated electromagnetic valve - Google Patents

Abstract

The application discloses a pilot-operated electromagnetic valve, which belongs to the field of electromagnetic valves and is used for an automobile heat pump system, and comprises a coil part and a valve body part, wherein the valve body part comprises a valve seat, the valve seat is provided with an inner cavity for accommodating a valve core, the valve core is positioned between a valve inlet and a valve outlet of the valve seat, the bottom end of the valve core is matched with a main valve sealing part at the top end of the valve outlet to realize the on-off of the valve inlet and the valve outlet, and the matching clearance between the valve core and the valve seat is theta; the top end opening of the valve seat is connected with a valve cover through threads, an O-shaped ring C is further arranged on the valve cover, and the O-shaped ring C is positioned below the threaded connection position of the valve cover and the valve seat; a filter screen is arranged outside the valve inlet, and the filtering pore diameter of the filter screen is smaller than the fit clearance value theta of the valve core and the valve seat. In view of the technical scheme, the valve core structure is improved, and the inside or outside impurities can be effectively restrained from invading the valve body through the reasonably arranged filter screen structure and the O-shaped ring structure, so that the reliability of the product is improved.

Description

Pilot-operated electromagnetic valve

Technical Field

The application belongs to the field of electromagnetic valves, and particularly relates to a pilot-operated electromagnetic valve.

Background

In a vehicle air conditioning system, particularly a heat pump system of new energy, since the heat pump system has the characteristics of diversified operation modes and complicated system pipelines, solenoid valves for opening and closing a refrigerating pipeline are increasingly used, and in some heat pump system schemes, a plurality of solenoid valves and other parts, such as an electronic expansion valve, a check valve, a temperature pressure sensor, etc., are provided in one part called a valve block module, and for miniaturization of the valve block module, the solenoid valves are generally designed in a screw cartridge valve structure to save installation space.

For example, in order to achieve downsizing and weight saving of the solenoid valve, a pilot solenoid valve disclosed in the patent document CN109114289a is disclosed, which is applicable to a refrigeration cycle of an air conditioner of an automobile, and the solenoid valve is improved in structure to achieve weight saving of the solenoid valve. Specifically, the pilot solenoid valve disclosed in this patent document has a pilot through hole and a pressure equalizing hole formed in a main valve element, and the valve element and a large diameter portion of a valve seat move relatively, and a pilot valve element and a pilot valve gasket which are engaged with the valve element are provided at a tip end of the valve element, and the pressure at both ends of the valve element is changed by a solenoid by a suction element, so that the valve element is moved by a pressure difference, and the flow inlet and the flow outlet are opened and closed.

In addition, referring to a pilot electromagnetic valve disclosed in patent document CN110735965a, an inlet channel is arranged in a valve body, the inlet channel is connected with a main cavity, a mounting cavity is connected above the main cavity, a sealing cavity is connected above the mounting cavity, an outlet channel is also connected below the main cavity, and a valve body connecting channel is arranged in the mounting cavity and is connected with the outlet channel and the mounting cavity; wherein a valve core component is arranged in the main cavity; a valve seat assembly is arranged above the valve core assembly; a valve core spring is arranged between the valve core assembly and the valve seat assembly; the upper end of the valve seat assembly is fixedly provided with a positioning ring, and the valve seat assembly is internally provided with a valve cover assembly in a matching way; the valve cover assembly is externally matched and provided with a coil assembly, and the coil assembly and the valve cover assembly are fixedly connected through a coil assembly fixing piece. The electromagnetic valve relates to the field of automobile air conditioner control devices, and has the characteristics of short response time, simple structure, small space and low cost.

However, the pilot solenoid valve disclosed in the above patent document has the following problems: the inlet is not provided with a filtering structure, so that the fluid in the inlet cannot be filtered, and impurities (metal chips or particles or floccules) enter between the valve core and the valve seat; the structure is not suitable for the threaded connection of the valve cover and the valve seat, and the corresponding sealing design is not carried out on the threaded connection of the valve cover and the valve seat; the structure between the valve core and the valve seat is complex, for example, the main valve core spring, the valve core spring and other structure assistance are needed.

Disclosure of Invention

The utility model aims at providing a guide formula solenoid valve, it has improved case structure to can effectively restrain inside or outside impurity invasion to the valve body inside through filter screen structure and O type circle structure that rationally sets up, improve the reliability of product.

In order to achieve the above purpose, the present application is realized by the following technical scheme:

the pilot-operated electromagnetic valve comprises a coil part and a valve body part, wherein the valve body part comprises a valve seat, the valve seat is provided with an inner cavity for accommodating a valve core, the valve core is positioned between a valve inlet and a valve outlet of the valve seat, the bottom end of the valve core is matched with a main valve sealing part at the top end of the valve outlet to realize the on-off of the valve inlet and the valve outlet, and the matching gap between the valve core and the valve seat is theta; the top end opening of the valve seat is connected with a valve cover through threads, an O-shaped ring C is further arranged on the valve cover, and the O-shaped ring C is positioned below the threaded connection position of the valve cover and the valve seat; a filter screen is arranged outside the valve inlet, and the filtering pore diameter of the filter screen is smaller than the fit clearance value theta of the valve core and the valve seat.

As one of the preferred technical schemes of the application, a pilot hole penetrating through the top end and the bottom end of the valve core is arranged at the position of the central axis, a pilot valve sealing part is arranged on the valve core at the opening of the top end of the pilot hole, and a sealing gasket A is fixed at the valve core at the outlet of the bottom end of the pilot hole through a fixing ring A; the circumferential side of the valve core is provided with an embedded groove for placing the sealing ring, the valve core at one side of the prior guide hole is also provided with air supplementing holes which penetrate through the top end and the bottom end of the valve core, and the air supplementing holes are positioned in the space formed by the sealing ring.

As one of the preferred technical schemes of the application, a spin riveting structure is arranged at the bottom end outlet of the pilot hole and at the bottom end edge of the valve core.

As one of the preferred technical schemes of this application, the top and the sealed pad B cooperation of pilot valve sealing portion, sealed pad B is fixed in the bottom of moving the iron core through retainer plate B, moves the inside of iron core and is provided with spring A, spring B, and spring A and the quiet iron core bottom contact of moving the iron core top, move iron core, quiet iron core and be located sheathed tube inside, the sleeve pipe is fixed in the top of valve gap, the sleeve pipe is located the inside of coil portion.

As one of the preferable technical schemes of the application, the valve seat is provided with valve seat external threads on the outer wall, and an O-shaped ring A is arranged at the valve seat above the valve seat external threads.

As one of the preferred embodiments of the present application, the valve seat is provided with an O-ring B on the side of the end portion close to the valve outlet.

As one of the preferred technical schemes of the application, the coil part comprises a magnetic conduction frame, the magnetic conduction frame is matched with the plastic package body to cover the winding, and the magnetic conduction frame is arranged on the static iron core through screws.

As one of the preferable technical schemes of the application, the filtering aperture of the filter screen is 0.6 times of the fit clearance theta between the valve core and the valve seat.

As one of the preferred technical solutions of the present application, the flow area of the pilot hole is greater than twice the flow area of the air compensating hole.

Compared with the prior art, the beneficial effects of this application are:

this application is through setting up filter screen structure in valve import position department, can effectively realize avoiding particle impurity, metal clastic, the flocculent fibre that comes from in the system to enter into between disk seat and the case to the filtering capability of preferred filter screen can filter the particulate matter that the appearance is greater than disk seat and case clearance value theta 0.6 times, avoids the solenoid valve to block because the meshing is impurity between case and the disk seat.

This application is through setting up O type circle C between disk seat and valve gap, can avoid disk seat and valve gap to assemble the time because friction and extrusion between the internal and external screw thread and very easily produce metal chip and metal granule enter into between moving core and the sleeve pipe to avoid above-mentioned structure to block because of meshing metal chip and metal granule.

The valve core structure is improved, and further, the valve core structure is prevented from being matched with an additional component to realize on-off function adjustment.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present application.

Fig. 2 is a schematic structural view of the valve body in the present application.

Fig. 3 is a schematic structural view of the valve cartridge in the present application.

Fig. 4 is a schematic structural view of the coil part.

Fig. 5 is a schematic view of the position of the impurity accommodating groove in the present application.

Fig. 6 is a schematic view of the structure of the filter screen in the present application.

In the figure: 1. a valve body; 101. a valve seat; 102. a filter screen; 103. an O-shaped ring A; 104. an O-shaped ring B; 105. a valve core; 106. a seal ring; 107. a sealing gasket A; 108. a fixing ring A; 109. a valve cover; 110. an O-shaped ring C; 111. a sleeve; 112. a stationary core; 113. a spring A; 114. a movable iron core; 115. a spring B; 116. a sealing gasket B; 117. a fixing ring B; 118. a valve outlet; 119. a valve inlet; 120. external threads of the valve seat; 121. a main valve sealing part; 122. a pilot valve sealing part; 123. a pilot hole; 124. an air supplementing hole; 125. an impurity accommodating groove; 126. a spin riveting structure;

2. a coil section; 201. a plastic package body; 202. a winding; 203. a magnetic conduction frame; 204. and (5) a screw.

Detailed Description

The technical scheme described in the application is further described and illustrated below with reference to the accompanying drawings and examples. It should be noted that, the terms possibly related to the following paragraphs include, but are not limited to, "up, down, left, right, front, back" and the like, and the directions according to which the terms are all visual directions shown in the drawings of the corresponding specification, which should not be construed as limiting the scope of protection of the present technical solution, but are only for facilitating the understanding of the technical solution described in the specification by those skilled in the art.

In the description of the following paragraphs, unless expressly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in view of the specific circumstances in combination with common general knowledge in the art, design specifications, standard documents, etc.

Referring to the structure shown in fig. 1 to 6, a pilot-operated electromagnetic valve comprises a valve body part 1 and a coil part 2, wherein the valve body part 1 comprises a valve seat 101, the valve seat 101 is provided with a cavity for accommodating a valve core 105, a valve inlet 119 and a valve outlet 118 which are communicated with the cavity in the valve seat 101 are respectively arranged at the bottom end of the valve seat 101, and the valve core 105 acts on a main valve sealing part 121 at the top end of the valve outlet 118 for realizing the on-off of the valve inlet 119 and the valve outlet 118; a filter screen 102 is arranged at the inlet of the valve inlet 119, and the filter screen 102 is an annular filter screen; the fit clearance between the valve core 105 and the valve seat 101 is theta, and the filter pore diameter of the filter screen 102 is smaller than the fit clearance value theta; the valve body 105 is provided with a pilot hole 123 penetrating through the valve body 105 at the central axis position, the pilot hole 123 is provided with a pilot valve sealing part 122 on the valve body 105 at the top end inlet, the valve body 105 at the two sides of the bottom end outlet of the pilot hole 123 is fixedly provided with a sealing gasket A107 through a fixing ring A108, and the sealing gasket A107 is used for sealing the top end inlet of the valve outlet 118.

The spool 105 is provided with a caulking groove for placing a sealing ring 106 on the circumferential side surface matched with the valve seat 101, the sealing ring 106 is contacted with the inner wall of the valve seat 101, and impurity accommodating grooves 125 for accommodating impurities are respectively formed at the top end and the bottom end of the sealing ring 106. The valve body 105 is further provided with an air supply hole 124 which is matched with the pilot hole 123, and the air supply hole 124 penetrates through the valve body 105 and is positioned on the valve body 105 in the space formed by the sealing ring 106. The flow area of the pilot hole 123 is larger than twice the flow area of the air supply hole 124.

The top end opening of the valve seat 101 is connected with a valve cover 109 through a threaded structure, a caulking groove for placing an O-shaped ring C110 is formed in the circumferential side wall below the threaded connection position of the valve cover 109, and the O-shaped ring C110 is in contact with the inner wall of the valve seat 101 and seals the connection position of the O-shaped ring C110 and the valve seat 101.

The central axis of the valve cover 109 is provided with a through hole for placing the bottom end of the movable iron core 114. The bottom end of the movable iron core 114 is fixed with a sealing pad B116 through a fixing ring B117, and the sealing pad B116 contacts with the pilot valve sealing part 122 and seals the top end inlet of the pilot hole 123. The inside of moving iron core 114 is provided with the through-hole, has placed spring A113, spring B115 in the through-hole, and the bottom of spring B115 contacts with sealed pad B116, and the top of spring A113 contacts with quiet iron core 112, and quiet iron core 112 is located the top of moving iron core 114, and leaves sufficient two relative motion's clearance between moving iron core 114 and the quiet iron core 112. The stationary core 112 and the movable core 114 are positioned in the sleeve 111, and the sleeve 111 is fixed on the valve cover 109.

The sleeve 111 is located in the coil part 2, specifically, the coil part 2 includes a plastic package body 201, a winding 202, a magnetic conduction frame 203, and a screw 204, wherein the winding 202 is located in a space formed by the plastic package body 201 and the magnetic conduction frame 203, the sleeve 111 is located in the winding 202, and the plastic package body 201 is connected with the static iron core 112 in the sleeve 111 through the screw 204.

The outer wall of the valve seat 101 is also provided with a valve seat external thread 120 connected with an external valve structure, and the valve seat 101 at the position of the valve seat external thread 120 is provided with an O-shaped ring A103. A circumferential side wall at the bottom end of the valve seat 101 near the outlet of the valve outlet 118 is provided with a caulking groove for placing an O-ring B104.

The screen 102 should have a skeleton structure supporting a screen, which is disposed in correspondence with the valve inlet 119.

On the basis of the above embodiments, the technical features involved therein and the functions and roles that the technical features play in the technical solution are described in detail using the following paragraphs so as to help those skilled in the art to fully understand the technical solution and reproduce it.

In the prior art, a pilot type solenoid valve is controlled to open and close by opening and closing pilot holes 123 in a valve body 105, and a pressure difference is generated at both ends of the valve body 105.

Specifically, in the initial (closed) state, the gasket B116 abuts against the pilot valve sealing portion 122 under the action of the springs a113 and B115, and due to the communication action of the air supply hole 124, the pressure above the spool 105 is equal to the pressure of the valve inlet 119, and the pressure of the valve inlet 119 is greater than the pressure of the valve outlet 118, so that the pressure above the spool 105 is greater than the pressure below the spool 105, the gasket a107 abuts against the main valve sealing portion 121 mainly under the action of the pressure difference across the spool 105, and the medium cannot flow from the valve inlet 119 to the valve outlet 118.

When the coil part 2 is energized, the movable iron core 114 moves upward under the magnetic force generated by the coil part 2, the gasket B116 is separated from the pilot valve sealing part 122, the pilot hole 123 is opened, the medium above the valve spool 105 flows to the valve outlet 118 through the pilot hole 123, and the medium outflow speed above the valve spool 105 is greater than the inflow speed of the medium through the air supplementing hole 124, so that the pressure above the valve spool 105 decreases accordingly, and when the pressure above the valve spool 105 decreases to a pressure below the valve spool 105 greater than the pressure above the valve spool 105, the valve spool 105 also moves upward, and the medium is allowed to flow from the valve inlet 119 to the valve outlet 118.

After the coil part 2 is powered off, the movable iron core 114 moves downwards under the action of the spring A113, the sealing gasket B116 is attached to the pilot valve sealing part 122 under the action of the spring A113 and the spring B115, the pilot hole 123 is closed, a medium enters the upper part of the valve core 105 through the air supplementing hole 124, the pressure above the valve core 105 rises along with the pressure, when the pressure above the valve core 105 rises to the pressure above the valve core 105 to be greater than the pressure below the valve core 105, the valve core 105 also moves downwards, the sealing gasket A107 is attached to the main valve sealing part 121 mainly under the action of the pressure difference at two ends of the valve core 105, and the medium cannot flow from the valve inlet 119 to the valve outlet 118.

The sleeve 111 is fixedly connected with the static iron core 112 through laser welding, the bottom end of the static iron core 112 is provided with a conical end, and the top end of the movable iron core 114 is provided with a conical hole into which the conical end can be inserted. The connection between the sleeve 111 and the valve cap 109 is by furnace brazing. The inside of moving iron core 114 is provided with the shoulder hole that link up with the taper hole in top, and spring A113, spring B115 have been placed respectively at the both ends in shoulder hole, and wherein spring A113's top stretches into in the taper hole and can contact with quiet iron core 112, and spring B115's bottom contacts with sealed pad B116, and sealed pad B116 is fixed in moving iron core 114 bottom through retainer plate B117. A spin-rivet structure 126 is formed at the bottom end of the movable core 114 to better fix and connect the fixing ring B117.

An O-ring C110 is disposed below the screwing position of the valve cover 109 and the valve seat 101, where the O-ring C110 is used to prevent metal fragments and metal particles caused by friction and extrusion from entering between the movable iron core 114 and the sleeve 111 in the screwing process of the two, so as to avoid blocking caused by meshing the metal fragments and the metal particles.

The inlet of the valve inlet 119 is provided with a filter screen 102, and the filter screen 102 can realize that the particles with the installation clearance value theta between the valve seat 101 and the valve core 105 being 0.6 times enter between the valve seat 101 and the valve core 105, so that the blocking of the valve seat 101 and the valve core 105 caused by the engagement of the particles, the metal chips and the flocculent fibers from the system is avoided.

Finally, although the description has been described in terms of embodiments, not every embodiment is intended to include only a single embodiment, and such description is for clarity only, as one skilled in the art will recognize that the embodiments of the disclosure may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (9)

1. The pilot-operated electromagnetic valve comprises a coil part (2) and a valve body part (1), wherein the valve body part (1) comprises a valve seat (101), the valve seat (101) is provided with an inner cavity for accommodating a valve core (105), the valve core (105) is positioned between a valve inlet (119) and a valve outlet (118) of the valve seat (101), the bottom end of the valve core (105) is matched with a main valve sealing part (121) at the top end of the valve outlet (118) to realize the on-off of the valve inlet (119) and the valve outlet (118), and the matching clearance between the valve core (105) and the valve seat (101) is theta; the top end opening of the valve seat (101) is connected with a valve cover (109) through threads, and is characterized in that: the valve cover (109) is also provided with an O-shaped ring C (110), and the O-shaped ring C (110) is positioned below the threaded connection position of the valve cover (109) and the valve seat (101); a filter screen (102) is arranged outside the valve inlet (119), and the filter pore diameter of the filter screen (102) is smaller than the fit clearance value theta between the valve core (105) and the valve seat (101).

2. A pilot operated solenoid valve as set forth in claim 1 wherein: the valve core (105) is provided with a pilot hole (123) penetrating through the top end and the bottom end of the valve core (105) at the central axis position, the valve core (105) at the top end opening of the pilot hole (123) is provided with a pilot valve sealing part (122), and a sealing gasket A (107) is fixed at the valve core (105) at the bottom end outlet of the pilot hole (123) through a fixing ring A (108); the circumferential side face of the valve core (105) is provided with a caulking groove for placing the sealing ring (106), the valve core (105) at one side of the pilot hole (123) is also provided with an air supplementing hole (124) penetrating through the top end and the bottom end of the valve core (105), and the air supplementing hole (124) is positioned in a space formed by the sealing ring (106).

3. A pilot operated solenoid valve as set forth in claim 2 wherein: and a spin riveting structure (126) is arranged at the bottom end outlet of the pilot hole (123) and at the bottom end edge of the valve core (105).

4. A pilot operated solenoid valve as set forth in claim 2 wherein: the top of pilot valve sealing part (122) cooperates with sealed pad B (116), and sealed pad B (116) are fixed in the bottom of moving iron core (114) through retainer plate B (117), and the inside of moving iron core (114) is provided with spring A (113), spring B (115), and spring A (113) and the quiet iron core (112) bottom contact of moving iron core (114) top, move the inside that iron core (114), quiet iron core (112) are located sleeve pipe (111), sleeve pipe (111) are fixed in the top of valve gap (109), sleeve pipe (111) are located the inside of coil portion (2).

5. A pilot operated solenoid valve as set forth in claim 3 wherein: the valve seat (101) is provided with a valve seat external thread (120) on the outer wall, and an O-shaped ring A (103) is arranged at the valve seat (101) above the valve seat external thread (120).

6. A pilot operated solenoid valve as defined in claim 4 wherein: the valve seat (101) is provided with an O-ring B (104) on the side surface of the end part close to the valve outlet (118).

7. A pilot operated solenoid valve as defined in claim 5 wherein: the coil part (2) comprises a magnetic conduction frame (203), the magnetic conduction frame (203) is matched with the plastic package body (201) to cover the winding (202), and the magnetic conduction frame (203) is arranged on the static iron core (112) through a screw (204).

8. A pilot operated solenoid valve according to any one of claims 1 to 7 wherein: the filtering pore diameter of the filter screen (102) is 0.6 times of the fit clearance theta between the valve core (105) and the valve seat (101).

9. A pilot operated solenoid valve according to any one of claims 2 to 7 wherein: the flow area of the pilot hole (123) is larger than twice the flow area of the air supply hole (124).