Patent Description:
The present invention relates to the field of refrigeration technology, and in particular, to an electromagnetic valve and an air conditioning system provided with same.

An electromagnetic valve is industrial equipment controlled by electromagnetism and serves as a fundamental component for automating fluid control. The electromagnetic valve is an actuator, and its type is not limited to a hydraulic actuator, a pneumatic actuator and so on. The electromagnetic valve is used to adjust a direction, a flow, a speed and other parameters of medium in an industrial control system. The electromagnetic valve can cooperate with different circuits to achieve an expected control, and can ensure precision and flexibility in control.

In the related art, the electromagnetic valve often suffers from leakage due to inadequate sealing between a valve bonnet and a valve seat, thus affecting a normal operation of the electromagnetic valve.

<CIT> discloses a normally closed electromagnetic valve, according to the preamble of claim <NUM>, including a valve body, a valve bonnet assembly, a coil assembly, a washer, a screw, a valve core assembly, and a moving iron core assembly. The valve body is connected to the valve cover assembly by threads. The valve bonnet assembly includes a valve bonnet, a sleeve, a static iron core, an iron core spring, and an O-ring.

<CIT> discloses a pilot operated electromagnetic valve including a valve body component, a pilot valve component, and a piston component. The piston component includes a first piston body, a second piston body, and an elastic member. The first piston body includes a receiving chamber, and the second piston body is at least partially provided in the receiving chamber. One end of the elastic member abuts against the first piston body along an axis of the elastic member, and the other end of the elastic member abuts against the second piston body along the axis of the elastic member. The second piston body can move axially relative to the first piston body, and the first piston body can move axially relative to the valve body component.

<CIT> discloses an electromagnetic valve including a valve seat, a valve cover located on the valve seat, and an electromagnetic component. The valve cover is in fit with the valve seat to form a valve chamber. The valve seat is provided with a first interface, a second interface, and a medium channel. The first interface is in communication to the valve chamber via the medium channel, and the second interface is in communication to the valve chamber. The electromagnetic component includes a movable iron core, and an end of the movable iron core is connected to a sealing element. The movable iron core is provided with a pressure relief hole on the part connected to the sealing element, and an end of the pressure relief hole extends to the position where the sealing element is located.

According to various embodiments of the present invention, an electromagnetic valve with high sealing performance is provided.

The present invention provides the following technical scheme.

An electromagnetic valve is provided. The electromagnetic valve includes a valve bonnet and a valve seat. The valve seat is provided with a mounting groove, a part of the valve bonnet is arranged in the mounting groove. The valve bonnet includes a large-diameter section and a small-diameter section, the small-diameter section extends into the mounting groove and is affixed to a groove wall of the mounting groove, and the large-diameter section abuts against the valve seat. A first sealing surface is formed by the large-diameter section abutting against the valve seat, and a second sealing surface is formed by the small-diameter section is affixed to the groove wall of the mounting groove. The valve bonnet and the valve seat are connected in a hard sealing connection manner at the first sealing surface, and the valve bonnet and the valve seat are connected in a soft sealing connection manner at the second sealing surface.

Furthermore, the large-diameter section is provided with a first abutting surface, a second abutting surface is provided at an abutting position of the valve seat and the large-diameter section; the first sealing surface is defined by the first abutting surface and the second abutting surface being in contact with and combined with each other, and the first abutting surface and the second abutting surface are in contact with and combined with each other to form the hard sealing connection manner.

Furthermore, a step portion protruding towards the second abutting surface is arranged on the first abutting surface, a concave portion matched with the step portion is arranged on the second abutting surface, and the concave portion is sunken towards a direction away from the first abutting surface, and when the first abutting surface is affixed to the second abutting surface, the step portion and the concave portion are tightly matched.

Furthermore, an annular protrusion protruding towards the second abutting surface is arranged on the first abutting surface, and when the first abutting surface is affixed to the second abutting surface, the annular protrusion is capable of being pressed and embedded in the second abutting surface.

Furthermore, a hardness of a material of the valve bonnet is greater than a hardness of a material of the valve seat.

In some embodiments, a cross-sectional shape of the annular protrusion is a triangular or a circular arc.

In some embodiments, an outer wall of the small-diameter section is provided with a third abutting surface, and an inner wall of the valve seat is provided with a fourth abutting surface, and a second sealing surface is formed by the third abutting surface and the fourth abutting surface being in contact and combined with each other; the third abutting surface is provided with a sealing groove, a sealing ring is disposed in the sealing groove, and the sealing ring is located in the sealing groove and extruded on the fourth bonding surface.

In some embodiments, the electromagnetic valve further includes a pilot valve component, and the pilot valve component is fixed disposed in the valve bonnet. The pilot valve component includes a valve sleeve, the valve sleeve is provided with a valve cavity, the valve seat is provided with a valve port which is in communication with the valve cavity. A piston unit is arranged in the valve sleeve, and the piston unit is capable of moving along an axial direction of the valve sleeve in the valve cavity to open/close the valve port.

In some embodiments, the piston unit includes a movable iron core, a fixed iron core, and an elastic member, and both ends of the elastic member are in contact with the movable iron core and the fixed iron core, the movable iron core is capable of moving in a direction towards or away from the fixed iron core under an action of elastic force and an action of electromagnetic force of the elastic member to open/close the valve port.

The present invention further provides the following technical scheme:
an air conditioning system including the above electromagnetic valve is provided.

Details of one or more embodiments of this application are presented in the attached drawings and descriptions below. And other features, purposes and advantages of this application will become apparent from the description, drawings and claims.

For a better description and illustration of embodiments and/or examples of those disclosures disclosed herein, reference may be made to one or more attached drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed disclosures, currently described embodiments and/or examples, and currently understood best modes of these disclosures.

Reference signs are as follows:
<NUM> represents an electromagnetic valve; <NUM> represents a valve bonnet; <NUM> represents a large-diameter section; <NUM> represents a small-diameter section; <NUM> represents a mounting hole; <NUM> represents a valve seat; <NUM> represents a mounting groove; <NUM> represents a valve port; <NUM> represents a first sealing surface; <NUM> represents a first abutting surface; <NUM> represents a step portion; <NUM> represents an annular protrusion; <NUM> represents a second abutting surface; <NUM> represents a concave portion; <NUM> represents a second sealing surface; <NUM> represents a third abutting surface; <NUM> represents a sealing groove; <NUM> represents a fourth abutting surface; <NUM> represents a sealing ring; <NUM> represents a pilot valve component; <NUM> represents a valve sleeve; <NUM> represents a valve cavity; <NUM> represents a piston unit; <NUM> represents a movable iron core; <NUM> represents a fixed iron core; <NUM> represents an elastic member; <NUM> represents a piston; and <NUM> represents an air conditioning system.

The technical scheme in the embodiment of this application will be described clearly and completely with the attached drawings. Obviously, the described embodiment is only a part of the embodiment of this application, not the whole embodiment. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work, and within the scope of the appended claims, belong to the protection scope of this application.

It should be noted that when a component is considered to be "mounted" on another component, it can be directly on the other component or there can be a component in the middle. When a component is considered to be "set on" another component, it can be directly set on another component or there may be intervening components at the same time. When a component is considered to be "fixed" to another component, it can be directly fixed to another component or there may be intervening components at the same time.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terminology used herein in the specification of this application is only for the purpose of describing specific embodiments, and is not intended to limit this application. As used herein, the term "or/and" includes any and all combinations of one or more related listed items.

Referring to <FIG>, the present invention provides an electromagnetic valve <NUM>, which is installed in an air conditioning system and used for controlling a communication of pipelines or breaking off a communication of pipelines, thus realizing a bidirectional circulation of a refrigerants.

In the related art, a traditional electromagnetic valve often suffers from leakage due to inadequate sealing between a valve bonnet and a valve seat, thus affecting a normal operation of the electromagnetic valve.

In order to solve the problem of leakage caused by inadequate sealing in the traditional electromagnetic valve, the present invention provides an electromagnetic valve <NUM>, and the electromagnetic valve <NUM> includes a valve bonnet <NUM> and a valve seat <NUM>. The valve seat <NUM> is provided with a mounting groove <NUM>, and a part of the valve bonnet <NUM> is arranged in the mounting groove <NUM>. The valve bonnet <NUM> includes a large-diameter section <NUM> and a small-diameter section <NUM>, the small-diameter section12 extends into the mounting groove <NUM> and is affixed to a groove wall of the mounting groove <NUM>, and the large-diameter section <NUM> abuts against the valve seat <NUM>. A first sealing surface <NUM> is formed by the large-diameter section <NUM> abutting against the valve seat <NUM>, and the small-diameter section <NUM> is affixed to the groove wall of the mounting groove <NUM> to form a second sealing surface <NUM>. The valve bonnet <NUM> and the valve seat <NUM> are connected in a hard sealing connection manner at the first sealing surface <NUM>, and the valve bonnet <NUM> and the valve seat <NUM> are connected in a soft sealing connection manner at the second sealing surface <NUM>. For example, "a hard sealing connection manner" can mean that both sealing surfaces forming a sealed connection are made of metal materials or other hard materials, and "a soft sealing connection" can mean that one sealing surface is made of metal materials or other hard materials, and the other sealing surface is made of elastic nonmetal materials.

The electromagnetic valve <NUM> provided by the present invention can realize a hard sealing at the first sealing surface <NUM> by making the valve bonnet <NUM> and the valve seat <NUM>, and realize a soft sealing at the second sealing surface <NUM>, so that an installation gap between the valve bonnet <NUM> and the valve seat <NUM> can be double sealed including hard seal and soft seal, which greatly improves the sealing effect, reduces the leakage rate, and makes the electromagnetic valve <NUM> operate stably and reliably.

Referring to <FIG>, the electromagnetic valve <NUM> includes a pilot valve component <NUM>, a valve bonnet <NUM>, and a valve seat <NUM>. The valve bonnet <NUM> is provided with a mounting hole <NUM>. A part of the pilot valve component <NUM> is installed in the mounting hole <NUM> and fixedly connected with the valve bonnet <NUM>. And the valve seat <NUM> is provided with a mounting groove <NUM>. The pilot valve component <NUM> and the valve bonnet <NUM> are installed in the mounting groove <NUM>, thus realizing the installation connection among the pilot valve component <NUM>, the valve bonnet <NUM> and the valve seat <NUM>.

Furthermore, the pilot valve component <NUM> includes a valve sleeve <NUM>. The valve sleeve <NUM> extends into the mounting hole <NUM> and is welded to the valve bonnet <NUM>. The valve sleeve <NUM> is provided with a valve cavity <NUM>, the valve seat <NUM> is provided with a valve port <NUM> which is in communication with the valve cavity <NUM>. A piston unit <NUM> is arranged in the valve sleeve <NUM>, and the piston unit <NUM> is capable of moving along an axial direction of the valve sleeve <NUM> in the valve cavity <NUM> to open/close the valve port <NUM>.

Furthermore, the piston unit <NUM> includes a movable iron core <NUM>, a fixed iron core <NUM>, and an elastic member <NUM>. The fixed iron core <NUM> is fixedly arranged at one end of the valve sleeve <NUM> away from the valve port <NUM>, and the movable iron core <NUM> is located at one end of the valve sleeve <NUM> adj acent to the valve port <NUM>. The elastic member <NUM> is connected between the movable iron core <NUM> and the fixed iron core <NUM>. The movable iron core <NUM> can be driven by the elastic member <NUM> to move along a direction towards/away from the fixed iron core <NUM>.

In some embodiments, the elastic member <NUM> is a spring. Of course, in other embodiments, the elastic member <NUM> can also choose other types of elastic structures, which are not limited here.

Furthermore, an end of the movable iron core <NUM> adjacent to the valve port <NUM> is connected with a piston <NUM>. With a movement of the movable iron core <NUM> in the valve sleeve <NUM> along the axial direction of the valve sleeve <NUM>, the piston <NUM> can abut against the valve port <NUM> to seal the valve port <NUM> or separate from the valve port <NUM> to open the valve port <NUM>, thus realizing the communication or breaking off the communication of the pipelines.

The working principle of the electromagnetic valve <NUM> provided by the present invention is that when an electromagnetic coil sleeved outside the valve sleeve <NUM> is powered on, the movable iron core <NUM> moves towards the fixed iron core <NUM> and overcomes an elastic force of the elastic member <NUM>, at this time, the piston <NUM> is driven by the movable iron core <NUM> to separate from the valve port <NUM>, so that the valve port <NUM> can be opened, and the electromagnetic valve <NUM> realizes the communication of an inlet pipeline and an outlet pipeline. When the electromagnetic coil sleeved outside the valve sleeve <NUM> is powered off, the movable iron core <NUM> moves away from the fixed iron core <NUM> under an elastic restoring force of the elastic member <NUM>, at this time, the piston <NUM> is driven by the movable iron core <NUM> to abut against the valve port <NUM>, and the valve port <NUM> is sealed by the piston <NUM>, so that the electromagnetic valve <NUM> can break off an communication between the inlet and outlet pipelines.

Furthermore, the valve bonnet <NUM> includes a large-diameter section <NUM> and a small-diameter section <NUM> which are connected with each other. A diameter of the large-diameter section <NUM> is larger than that of the small-diameter section <NUM>. The large-diameter section <NUM> is located at one end of the valve bonnet <NUM> adjacent to the pilot valve component <NUM>. The small-diameter section <NUM> is located at one end of the valve bonnet <NUM> adjacent to the valve seat <NUM>, and the large-diameter section <NUM> and the small-diameter section <NUM> are integrally formed to form the valve bonnet <NUM>.

Specifically, when the valve bonnet <NUM> is installed in the valve seat <NUM>, the small-diameter section <NUM> extends into the mounting groove <NUM> and is affixed to the groove wall of the mounting groove <NUM>, so that the large-diameter section <NUM> can abut against the valve seat <NUM>. By providing the large-diameter section <NUM>, when the valve bonnet <NUM> is installed in the valve seat <NUM>, the valve bonnet <NUM> can abut against the valve seat <NUM> to form a limit, so as to prevent the valve bonnet <NUM> from excessively extending into the valve seat <NUM>, and further avoid causing structural fracture.

Furthermore, the large-diameter section <NUM> abuts against the valve seat <NUM> to form a first sealing surface <NUM>, and the small-diameter section <NUM> is affixed to the groove wall of the mounting groove <NUM> to form a second sealing surface <NUM>. The valve bonnet <NUM> and the valve seat <NUM> are connected in a hard sealing connection manner at the first sealing surface <NUM>, and the valve bonnet <NUM> and the valve seat <NUM> are connected in a soft sealing connection manner at the second sealing surface <NUM>.

Specifically, the large-diameter section <NUM> is provided with a first abutting surface <NUM>, and the valve seat <NUM> is provided with a second abutting surface <NUM> abutting against the large-diameter section <NUM>. The first abutting surface <NUM> and the second abutting surface <NUM> are in contact with and combined with each other to form the first sealing surface <NUM>, and the first abutting surface <NUM> and the second abutting surface <NUM> are in contact with and combined with each other to form the hard sealing connection manner, so that both a sealing performance and a sealing strength can be improved.

Referring to <FIG>, in an embodiment, a step portion <NUM> protruding towards the second abutting surface <NUM> is arranged on the first abutting surface <NUM>. A concave portion <NUM> matched with the step portion <NUM> is arranged on the second abutting surface <NUM>, and the concave portion <NUM> is sunken towards a direction away from the first abutting surface <NUM>, when the first abutting surface <NUM> is affixed to the second abutting surface <NUM>, the step portion <NUM> and the concave portion <NUM> are tightly matched, so that another manner of a hard sealing is realized at the first sealing surface <NUM>.

Compared with the first sealing surface <NUM> not provided with the step portion, the first sealing surface <NUM> provided with the step portion <NUM> has added another barrier to prevent an external medium from penetrating. That is to say, assuming that the first sealing surface <NUM> without the step portion is horizontal, the first sealing surface <NUM> with the step portion <NUM> is provided with a vertical surface on the basis of horizontal surface. If a small amount of medium still leaks out from the first sealing surface <NUM>, the medium will be blocked from leaking from the horizontal surface to the vertical surface at the step portion <NUM>. Therefore, the arrangement of the step portion <NUM> can further enhance the sealing performance of the hard seal and further reduce a leakage possibility.

It should be noted that the step portion <NUM> is not limited to being arrange on the first abutting surface <NUM>. In other embodiments, the step portion <NUM> can also be arranged on the second abutting surface <NUM>, and at this time, the concave portion <NUM> is correspondingly arranged on the first abutting surface <NUM>, so long as the sealing performance can be improved, which is not limited here.

Of course, in this embodiment, a number of the step portion <NUM> can be adjusted according to a structure or a different requirements, and the step portion <NUM> can be arranged to one, two, three or even more, which is not limited here.

Referring to <FIG>, furthermore, an annular protrusion <NUM> protruding towards the second abutting surface <NUM> is arranged on the first abutting surface <NUM>, when the first abutting surface <NUM> is affixed to the second abutting surface <NUM>, the annular protrusion <NUM> is capable of being pressed and embedded in the second abutting surface <NUM>. In this way, a sealing performance of the valve bonnet <NUM> and the valve seat <NUM> at the first sealing surface <NUM> can be further enhanced.

Specifically, a width at a bottom of the annular protrusion <NUM> is greater than that at a top of the annular protrusion <NUM>, and the width of the annular protrusion <NUM> gradually increases from the top to the bottom. In this way, a face-to-face seal at the first sealing surface <NUM> becomes a line-to-face seal, and the annular protrusion <NUM> having a top with a smaller width can increase a contact stress by reducing a contact area, thus improving a reliability of the hard seal.

In this embodiment, the annular protrusion <NUM> is not limited to be arranged on the first abutting surface <NUM>. In other embodiments, the annular protrusion <NUM> can also be arranged on the second abutting surface <NUM>, so long as the sealing performance can be improved, which is not limited here.

It is worth noting that whether the annular protrusion <NUM> is disposed on the first abutting surface <NUM> or the second abutting surface <NUM>, it is required that a hardness of a material of the valve bonnet <NUM> with the annual projection <NUM> or the valve seat <NUM> with the annual projection <NUM> is greater than that of the valve seat <NUM> without the annual projection or the valve bonnet <NUM> without the annual projection. In this way, the annular protrusion <NUM> can have elastic-plastic deformation better, and then it is easier to be embedded in the valve seat <NUM> or the valve bonnet <NUM>.

In this embodiment, the valve bonnet <NUM> is made of a hard stainless steel material, and the valve seat <NUM> is made of aluminum alloy material. Of course, in other embodiments, the valve bonnet <NUM> and the valve seat <NUM> can also be made of other metal materials such as copper material, which is not limited here.

Furthermore, a cross section of the annular protrusion <NUM> is in a triangular, circular or trapezoidal shape, as long as a width of a bottom of the annual projection <NUM> can be ensured to be greater than a width of a top of the annual projection <NUM>, so as to facilitate an embedding of the annual projection <NUM> into the valve seat <NUM> or the valve bonnet <NUM>. The shape of a cross section of the annual projection <NUM> is not limited here.

In this embodiment, a number of the annular protrusions <NUM> can be one or more. In an embodiment, the number of the annular protrusions <NUM> is two or three. Although theoretically speaking, an installation number of the annular protrusions <NUM> is directly proportional to the sealing reliability, however, due to too many the annular protrusions <NUM>, a machining errors of the annular protrusions <NUM> higher than the first abutting surface <NUM> will be accumulated more. Furthermore, a sealing effect of each of the annular protrusions <NUM> is not exactly the same. At the same time, the more the number of the annular protrusions <NUM>, a larger space occupied by the annular protrusions <NUM>, and a greater a thread pre-tightening force required by the annular protrusions <NUM> to ensure an elastic-plastic deformation is, which will make an overall structure too bloated. Therefore, when a number of the annular protrusions <NUM> is two or three, it can meet requirement based on multiple factors such as a sealing effect, a structural size and a machining accuracy at the same time.

Furthermore, an outer wall of the small-diameter section <NUM> is provided with a third abutting surface <NUM>, and an inner wall of the valve seat <NUM> is provided with a fourth abutting surface <NUM>. The third abutting surface <NUM> and the fourth abutting surface <NUM> are combined and affixed to each other to form the second sealing surface <NUM>. A sealing groove <NUM> is arranged on the third abutting surface <NUM>, and a sealing ring <NUM> is installed in the sealing groove <NUM> and extruded on the fourth abutting surface <NUM>. In this way, a second soft sealing between the valve bonnet <NUM> and the valve seat <NUM> is realized, which enhances the sealing performance and reduces the leakage possibility.

It should be noted that on a basis of a first hard sealing at the first sealing surface <NUM>, a second soft sealing at the second sealing surface <NUM> can play a role of backup and protective seal. When the hard sealing formed by the annular protrusion <NUM> fails, the sealing between the valve seat <NUM> and the valve bonnet <NUM> can still maintain by the second soft sealing. Similarly, if the sealing ring <NUM> is out of work in extreme low or high temperature environments, the first hard sealing between the valve seat <NUM> and the valve bonnet <NUM> can still maintain, thus improving the sealing reliability between the valve bonnet <NUM> and the valve seat <NUM>.

Furthermore, the sealing ring <NUM> can be in an O-ring shape and it is not limited to this. In other embodiments, other sealing structures can also be selected, as long as sealing can be realized.

In this embodiment, an arrangement position of the sealing groove <NUM> is not limited to the third abutting surface <NUM>. In other embodiments, the sealing groove <NUM> can be arranged on the fourth abutting surface <NUM>. Alternatively, both the third abutting surface <NUM> and the fourth abutting surface <NUM> are provided with the sealing groove <NUM>. In other words, the arrangement position of the sealing groove <NUM> is not limited, as long as the sealing performance can be improved.

The present invention further provides an air conditioning system <NUM> including the above electromagnetic valve <NUM> provided.

In the electromagnetic valve <NUM> provided by the present invention, it can realize a hard sealing at the first sealing surface <NUM> and a soft sealing at the second sealing surface <NUM> between the valve bonnet <NUM> and the valve seat <NUM>, so that it can achieve double sealing with hard seal and soft seal at an installation gap between the valve bonnet <NUM> and the valve seat <NUM>, which greatly improves the sealing effect, reduces the leakage possibility, and makes the electromagnetic valve <NUM> operate stably and reliably.

Claim 1:
An electromagnetic valve (<NUM>), comprising a valve bonnet (<NUM>) and a valve seat (<NUM>), wherein the valve seat (<NUM>) is provided with a mounting groove, a part of the valve bonnet (<NUM>) is arranged in the mounting groove;
wherein the valve bonnet (<NUM>) comprises a large-diameter section (<NUM>) and a small-diameter section (<NUM>), the small-diameter section (<NUM>) extends into the mounting groove (<NUM>) and is affixed to a groove wall of the mounting groove (<NUM>), and the large-diameter section (<NUM>) abuts against the valve seat (<NUM>);
wherein a first sealing surface (<NUM>) is formed by the large-diameter section (<NUM>) abutting against the valve seat (<NUM>), and a second sealing surface (<NUM>) is formed by the small-diameter section (<NUM>) being affixed to the groove wall of the mounting groove (<NUM>); the valve bonnet (<NUM>) and the valve seat (<NUM>) are connected in a hard sealing connection manner at the first sealing surface (<NUM>), and the valve bonnet (<NUM>) and the valve seat (<NUM>) are connected in a soft sealing connection manner at the second sealing surface (<NUM>); charaterized in that
the large-diameter section (<NUM>) is provided with a first abutting surface(<NUM>), a second abutting surface (<NUM>) is provided at an abutting position of the valve seat (<NUM>) and the large-diameter section (<NUM>);
a step portion (<NUM>) protruding towards the second abutting surface (<NUM>) is arranged on the first abutting surface (<NUM>), a concave portion (<NUM>) matched with the step portion (<NUM>) is arranged on the second abutting surface (<NUM>), and the concave portion (<NUM>) is sunken towards a direction away from the first abutting surface (<NUM>), and when the first abutting surface (<NUM>) is affixed to the second abutting surface (<NUM>), the step portion (<NUM>) and the concave portion (<NUM>) are tightly matched;
an annular protrusion (<NUM>) protruding towards the second abutting surface (<NUM>) is arranged on the first abutting surface (<NUM>), and when the first abutting surface (<NUM>) is affixed to the second abutting surface (<NUM>), the annular protrusion (<NUM>) is capable of being pressed and embedded in the second abutting surface (<NUM>);
a hardness of a material of the valve bonnet (<NUM>) is greater than a hardness of a material of the valve seat (<NUM>).