CN114623258A

CN114623258A - Reversing valve

Info

Publication number: CN114623258A
Application number: CN202011435056.1A
Authority: CN
Inventors: 汪泽波
Original assignee: Festo China Automation Manufacturing Co ltd; Festo SE and Co KG
Current assignee: Festo China Automation Manufacturing Co ltd; Festo SE and Co KG
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2022-06-14
Anticipated expiration: 2040-12-10
Also published as: CN114623258B

Abstract

The invention provides a reversing valve. The reversing valve (100) comprises a reversing valve body (1) and two pilot chamber control units (2) which are connected with each other, the two pilot cavity control units (2) are arranged on two sides or the same side of the reversing valve body (1) in the length direction of the reversing valve body (1), the reversing valve body (1) is provided with a first end cover (13) and a second end cover (14) in the length direction, a valve cavity (101) is arranged in the reversing valve body (1), a first valve core assembly (11) and a second valve core assembly (12) are arranged in the valve cavity (101), the first valve core assembly (11) and the second valve core assembly (12) are opposite to each other in the length direction, the first valve core assembly (11) has a first end adjacent the first end cover (13) and a second end facing away from the first end cover (13).

Description

Reversing valve

Technical Field

The invention relates to the field of reversing valves, in particular to a double-two-position three-way valve structure with mechanical reset.

Background

The existing reset modes of the reversing valve include the following modes:

1. a FESTO VUVG solenoid valve which returns to an initial state only when there is pressure in the pressure port region;

2. the springs of the valve are positioned on the end faces of the two valve cores. In this case, the spool needs to have a large size in order to place the spring. The total length of the valve body can be increased by the stroke of the spring, and the two valve cores and the spring must be pressed into the valve body when the valve is installed, otherwise, the spring is easy to jump out;

3. one of the plungers of the valve is placed between the two valve cores, and the spring needs to be installed from the middle of the valve cores, and then other parts such as the plunger, the insert and the like are placed. When the two valve cores and the spring are installed, the two valve cores and the spring need to be pressed to enter the valve body, otherwise, the ejector rod is easy to jump out. The size of the spool will therefore be relatively large. In addition, for a small valve with a compact structure, the diameter of the valve core is objectively smaller, so that the hole ratio in the middle of the valve core is smaller, the diameter of a spring arranged in the hole ratio is also smaller, and the risk that the spring force is not enough to push the valve core to reset exists.

CN203374939U discloses a mounting structure of a reset spring of a movable iron core of a loom electromagnetic valve, wherein a reset spring is pressed between the movable iron core and a sleeve, one end of the reset spring is sleeved in a spring seat on the movable iron core, the other end of the reset spring is sleeved in a spring hole of the sleeve, the spring hole is coaxial with the spring seat hole, the longitudinal sections of the spring hole and the spring seat hole are both trapezoidal, and the spring hole is opposite to the flaring end of the spring seat hole; the vertex angle of the trapezoid of the longitudinal section of the spring hole is 4 degrees; the diameter of the spring hole is the same as that of the flaring end face opposite to the spring seat hole. When the movable iron core moves along a deviated track, the reset spring is not contacted with the inner wall of the spring hole, so that the reset spring is prevented from being damaged, the electromagnetic valve is not in an explosion-dead state, the stability of the effective operation of the electromagnetic valve is improved, and the movable iron core reset spring is suitable for the installation of the reset spring of the movable iron core of the electromagnetic valve.

Disclosure of Invention

The invention aims to provide a large installation space for a spring under the condition of ensuring the compactness of a valve core, so that a large spring can be installed to obtain a sufficient reset force. In addition, the invention also aims to prevent the spring and the ejector rod from jumping out and facilitate assembly.

Furthermore, the present invention is also directed to solve or alleviate other technical problems of the prior art.

The present invention solves the above problems by providing a reversing valve, and specifically, according to an aspect of the present invention, there is provided:

a reversing valve comprises a reversing valve body and two pilot cavity control units which are connected with each other, wherein the two pilot cavity control units are arranged on two sides or the same side of the reversing valve body in the length direction of the reversing valve body,

the reversing valve body is respectively provided with a first end cover and a second end cover in the length direction,

a valve cavity is arranged in the reversing valve body, a first valve core assembly and a second valve core assembly are arranged in the valve cavity, the first valve core assembly and the second valve core assembly are opposite to each other in the length direction, the first valve core assembly is provided with a first end part close to the first end cover and a second end part deviating from the first end cover, the second valve core assembly is provided with a third end part deviating from the second end cover and a fourth end part close to the second end cover,

the reversing valve body has sealing lips configured at an outer periphery of the first end portion of the first valve core assembly and an outer periphery of the fourth end portion of the second valve core assembly, respectively, and sealing rings configured at an outer periphery of the second end portion of the first valve core assembly and an outer periphery of the third end portion of the second valve core assembly, respectively, and the sealing rings are configured to be thicker than the lips in a radial direction,

a first pilot chamber and a second pilot chamber are respectively provided outside the first end portion of the first valve core assembly and outside the fourth end portion of the second valve core assembly, the first pilot chamber and the second pilot chamber being configured to subject the first valve core assembly and the second valve core assembly to thrust forces acting in directions approaching each other, respectively, in a case where pilot gas is introduced,

wherein the content of the first and second substances,

through holes are respectively formed in the first valve core assembly and the second valve core assembly, the length direction of the through holes is consistent with the length direction of the first valve core assembly and the second valve core assembly, the through holes are divided into a first valve core cavity and a second valve core cavity which are communicated with each other, the first valve core cavity is arranged to be closer to two sides of the reversing valve body relative to the second valve core cavity and is positioned at the lip-shaped ring, and the first valve core cavity has a larger radial size than the second valve core cavity,

the first valve core assembly and the second valve core assembly are respectively provided with a first plug and a second plug, the first plug and the second plug respectively seal the first end of the first valve core assembly and the fourth end of the second valve core assembly,

the first valve core assembly and the second valve core assembly are respectively provided with a first mechanical spring and a second mechanical spring, and are also respectively provided with a first ejector rod and a second ejector rod, the length directions of the first mechanical spring and the second mechanical spring are consistent with the length directions of the first valve core assembly and the second valve core assembly, the first mechanical spring and the second mechanical spring are respectively arranged in the first valve core cavity, the first ejector rod and the second ejector rod are slidably and respectively at least partially arranged in the second valve core cavity, one ends of the first ejector rod and the second ejector rod are butted with each other, and the other ends of the first ejector rod and the second ejector rod respectively extend to the first valve core cavity,

the first ejector pin and the second ejector pin respectively have a first abutting portion and a second abutting portion, the first abutting portion and the second abutting portion have a larger radial dimension than the second spool chamber, the first mechanical spring is arranged between the first plug and the first abutting portion, the second mechanical spring is arranged between the second plug and the second abutting portion,

the first mechanical spring and the second mechanical spring are configured to continuously apply a pushing force to the first plug and the second plug, respectively, so that the first valve core assembly and the second valve core assembly can be pushed to initial working positions, respectively, under the condition that the first pilot cavity and the second pilot cavity are not provided with pilot gas.

Optionally, in accordance with an embodiment of the invention, the directional control valve is configured as a two-position, three-way valve.

Alternatively, according to an embodiment of the invention, the pilot chamber control unit is an electromagnetically or pneumatically controlled pilot chamber control unit.

Optionally, according to an embodiment of the present invention, when the first spool assembly and the second spool assembly are in the initial working position, the first abutting portion and the second abutting portion respectively abut against a transition of the first spool cavity and the second spool cavity.

Optionally, in accordance with an embodiment of the invention, the first end of the first spool assembly has a larger diameter than the second end of the first spool assembly, and the fourth end of the second spool assembly has a larger diameter than the third end of the second spool assembly.

Optionally, according to an embodiment of the present invention, the first plunger and the second plunger further have a first protrusion and a second protrusion, respectively, the first protrusion and the second protrusion form ends of the first plunger and the second plunger at the first valve core cavity, respectively, and the first mechanical spring and the second mechanical spring are respectively sleeved on the first protrusion and the second protrusion.

The provided diverter valve has the benefits of: two sealing elements with small installation bottom diameters are arranged in the area of the pressure port, two lip-shaped rings with large installation bottom diameters are arranged in the area of the pilot port, and the spring is arranged in a large cavity, so that a larger space is beneficial to designing a larger spring, and the purpose of obtaining enough reset force by installing a large spring on a compact valve core is realized; the plug is fixed on one side of the valve core, and the spring and the ejector rod cannot jump out, so that the valve is easy to assemble.

Drawings

The above and other features of the present invention will become apparent with reference to the accompanying drawings, in which,

FIG. 1 is a schematic view of a reversing valve according to the present invention in an initial operating position;

FIG. 2 shows a schematic view of a reversing valve according to the present invention in a final operating position;

fig. 3 shows a schematic view of the first spool chamber and the second spool chamber of a reversing valve according to the present invention.

Detailed Description

It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," "third," and the like are used for descriptive and descriptive purposes only and not for purposes of indication or implication as to the relative importance of the respective components.

Referring to fig. 1 and 2, there is shown a schematic view of fig. 1 showing a reversing valve 100 according to the present invention in an initial operating position and a schematic view of a reversing valve 100 according to the present invention in an end operating position, respectively.

The direction valve 100 includes a direction valve body 1 and two pilot chamber control units 2 connected to each other, the two pilot chamber control units 2 are disposed at both sides or the same side of the direction valve body 1 in a length direction of the direction valve body 1,

the direction valve body 1 has a first end cap 13 and a second end cap 14 in its longitudinal direction,

a valve cavity 101 is arranged in the reversing valve body 1, a first valve core assembly 11 and a second valve core assembly 12 are arranged in the valve cavity 101, the first valve core assembly 11 and the second valve core assembly 12 are opposite to each other in the length direction, the first valve core assembly 11 is provided with a first end part close to the first end cover 13 and a second end part deviating from the first end cover 13, the second valve core assembly 12 is provided with a third end part deviating from the second end cover 14 and a fourth end part close to the second end cover 14,

the reversing valve body 1 has sealing lips 19 and sealing rings 20, the lips 19 being respectively formed at the outer periphery of the first end of the first valve core assembly 11 and the outer periphery of the fourth end of the second valve core assembly 12, the sealing rings 20 being respectively formed at the outer periphery of the second end of the first valve core assembly 11 and the outer periphery of the third end of the second valve core assembly 12, and the sealing rings 20 being formed thicker than the lips 19 in the radial direction,

a first pilot chamber 114 and a second pilot chamber 115 are respectively provided outside the first end portion of the first valve core assembly 11 and outside the fourth end portion of the second valve core assembly 12, the first pilot chamber 114 and the second pilot chamber 115 are configured to subject the first valve core assembly 11 and the second valve core assembly 12 to thrust forces acting in directions approaching each other, respectively, in the case where pilot gas is introduced,

wherein the content of the first and second substances,

through holes are respectively arranged in the first valve core assembly 11 and the second valve core assembly 12, the length direction of the through holes is consistent with the length direction of the first valve core assembly 11 and the second valve core assembly 12, the through holes are divided into a first valve core cavity 112 and a second valve core cavity 113 which are communicated with each other, the first valve core cavity 112 is arranged to be closer to two sides of the reversing valve body 1 relative to the second valve core cavity 113 and is positioned at the lip ring 19, and the first valve core cavity 112 has a larger radial size than the second valve core cavity 113,

the first valve core assembly 11 and the second valve core assembly 12 are respectively provided with a first plug 111 and a second plug 121, the first plug 111 and the second plug 121 respectively close the first end of the first valve core assembly 11 and the fourth end of the second valve core assembly 12,

the first valve core assembly 11 and the second valve core assembly 12 are respectively provided with a first mechanical spring 15 and a second mechanical spring 16, and are also respectively provided with a first ejector rod 17 and a second ejector rod 18, the length direction of the first mechanical spring 15 and the length direction of the second mechanical spring 16 are consistent with the length direction of the first valve core assembly 11 and the second valve core assembly 12, the first mechanical spring 15 and the second mechanical spring 16 are respectively arranged in the first valve core cavity 112, the first ejector rod 17 and the second ejector rod 18 are slidably and respectively at least partially arranged in the second valve core cavity 113, one end of each first ejector rod is butted with the other end of each first valve core cavity 112,

the first and

second carrier bars

17, 18 have a first and

second abutment

171, 181, respectively, the first and

second abutment

171, 181 having a greater radial dimension than the second spool chamber 113, the first mechanical spring 15 being disposed between the first plug 111 and the first abutment 171, the second mechanical spring 16 being disposed between the second plug 121 and the second abutment 181,

the first mechanical spring 15 and the second mechanical spring 16 are configured to continuously apply a pushing force to the first plug 111 and the second plug 121, respectively, so that the first valve core assembly 11 and the second valve core assembly 12 can be pushed to an initial working position, respectively, in the case that the first pilot cavity and the second pilot cavity have no pilot gas.

It should be understood that "the reversing valve body 1 and the two pilot chamber control units 2 connected to each other" means that the two pilot chamber control units 2 are connected to the reversing valve body 1 (or their respective pilot chambers), respectively, and that the two pilot chamber control units 2 do not necessarily need to be connected to each other. The two pilot chamber control units 2 are arranged on both sides or on the same side of the reversing valve body 1 in the length direction of the reversing valve body 1, which can depend on the shape of the receiving space in which the entire reversing valve 100 is to be placed, or on the size and shape of the reversing valve body 1 and the respective pilot chamber control unit 2 itself. It should be understood that although the first pilot chamber 114 and the second pilot chamber 115 of the direction valve 100 are located on both sides of the direction valve 100, it does not affect the two pilot chamber control units 2 being located on the same side of the direction valve 100, because the connection and communication of the pilot chamber control units 2 and the corresponding pilot chambers on different sides from each other can be achieved through a specific air path arrangement.

In addition, the main components of the spool assembly include a spool body and sealing members (e.g., the lip ring 19 and the seal ring 20) disposed on an outer peripheral surface (specifically, a non-recessed portion of the outer peripheral surface) of the spool body for sealing with the corresponding valve chamber. A groove is formed at the outer periphery of the valve cartridge body, whereby the non-groove portion of the outer peripheral surface can be understood as a projection. The projection is configured to enable switching of the working ports during movement of the poppet body (e.g., in the event of movement to an initial or final working position).

The sealing ring 20 is designed to be thicker in the radial direction than the lip ring 19, since the lip ring 19 is often subjected to unilateral pressure, i.e. the lip ring 19 is subjected to an inward-outward expansion pressure in the case of the pilot gas opening of the respective pilot chamber. Whereas the seal 20 is subjected to a bilateral pressure, i.e. in addition to the above-mentioned opening pressure, the seal 20 is subjected to a pressure in the other direction, which is brought about by the valve core assembly. Therefore, the seal ring 20 is made thicker to withstand such bilateral pressure. In addition, the corresponding recess in the valve core assembly for receiving the sealing ring 20 can also be designed deeper in order to correspond to this thicker design of the sealing ring.

In this respect, the sealing ring 20 can be designed as an O-ring, i.e. as a sealing element which is ring-shaped in cross section, as a result of which inexpensive, simple to produce, functionally reliable and simple to install characteristics can be achieved. For example, an O-ring interposed between the choke plug and the valve core serves to prevent blow-by in the pressure port area and the pilot area.

In addition to the sealing rings 20 configured at the outer periphery of said second end of said first valve core assembly 11 and at the outer periphery of said third end of said second valve core assembly 12, respectively, said sealing rings 20 can also be configured at a projection of the middle of the respective valve core assembly, since this area of the valve core assembly will be subjected to a certain air pressure in the respective working position. And the lip 19 can also be configured at an outer periphery at a distance inward from the outer periphery of the first end of the first spool assembly 11 and from the outer periphery of the fourth end of the second spool assembly 12. The valve core assembly can be provided with a plurality of lip-shaped rings and sealing rings which are constructed at different peripheral positions, so that the overall sealing performance of the reversing valve is improved.

The first plug 111 and the second plug 121 respectively close the first end of the first valve core assembly 11 and the fourth end of the second valve core assembly 12, so that the corresponding plugs are fixed at one side of the corresponding valve core, so that the corresponding spring and the ejector rod cannot jump out, and the assembly is easy. For example, during the assembly of the direction valve 100, the corresponding spring may be first installed into the associated spool cavity from the middle of the direction valve 100, and then other parts such as the plunger and the like may be installed, thereby achieving a simple assembly process.

By employing a mechanical spring design, there is no risk of the valve failing to return to an initial position in the event that the gas supply is not supplying gas (e.g., the gas supply system suddenly stops or a pilot signal toggles) relative to the gas spring embodiment. Especially, the application in the aspect of safety is more advantageous.

According to the main solution of the present application, the first and second

mechanical springs

15, 16 are arranged respectively inside the first spool chamber 112, which means that the respective mechanical springs are located at the end zone of the belonging spool assembly, i.e. at the zone where the lip is located. Since the lip ring is designed to be thinner than the sealing ring, which means that the mounting base diameter of the lip ring is larger than the mounting base diameter of the sealing ring, the volume of the first spool chamber 112 is larger than the volume of the second spool chamber 113, and therefore such a region can leave a larger accommodation space for a corresponding mechanical spring, so that a larger (in particular, larger outer diameter) spring can be mounted to obtain a larger restoring force.

The first plunger 17 and the second plunger 18 are slidably and respectively arranged at least partially in the second valve core chamber 113, and have one end abutting against each other and the other end extending to the first valve core chamber 112, so that the respective mechanical spring is continuously pushed by the end of the corresponding plunger relatively closer to the two sides of the reversing valve 100, and the respective mechanical spring is continuously pushed to the corresponding plug, thereby ensuring the continuous application of the reset force.

The first and

second abutments

171 and 181 are designed to provide mounting points for the respective mechanical springs, and due to the different sizes of the first and second spool cavities, they can also simultaneously serve a limiting function, i.e., limit the range of movement of the plunger within the spool cavity, for example, to prevent the risk of uneven reset force caused by the abutting position of the two plungers deviating from the middle of the directional valve 100.

In addition to the above-mentioned technical effects, it can be seen that by the above-mentioned solution, by placing two (for the spring) seals with a small bottom diameter in the pressure port area and two (for the spring) lips with a large bottom diameter in the pilot port area, the spring is placed in a large cavity, and the larger space thus achieved facilitates the design of a relatively large spring, thereby enabling the installation of a large spring in a compact cartridge for obtaining a sufficient return force. The application provides a switching-over valve with mechanical spring reset function has compact structure, easily assembled characteristics.

It can also be seen from the figure that the directional valve 100 is configured as a two-position, three-way valve. A two-position three-way valve is a combination of two-position three-way valves, where a two-position three-way valve refers to a directional valve (e.g., a solenoid valve) having two operating positions and three ports. The combination form is not simple superposition, but the reversing valves of the total five gas ports share the gas source port/gas inlet port.

For example, the five ports shown in the figures are, from left to right, exhaust, working, intake, working and exhaust ports. When the reversing valve or the valve core assembly is in the initial working position, the two pilot cavities are not communicated with the pilot cavities, the two valve core assemblies are separated from each other, the air inlet is disconnected with the passage of the working port, the air outlet is communicated with the passage of the working port, and therefore air in the working port can be exhausted through the air outlet. Under the condition that the pilot cavity is communicated with the pilot gas, the valve core assemblies move close to each other to the final working position, and at the moment, the gas inlet is communicated with the two working ports, so that certain application is realized. It should be understood that this principle of operation can be reversed and that the recess and projection of the core assembly can be modified by one skilled in the art as required by the application.

The pilot chamber control unit 2 can be an electromagnetically or pneumatically controlled pilot chamber control unit 2. The reversing valve body 1 can also be constructed in an adaptive manner. For example, in the case where the pilot chamber control unit 2 is configured as a solenoid-operated pilot chamber control unit (i.e., the direction switching valve 100 is configured as a solenoid valve), it has a nozzle, an electrically driven assembly, a coil, and the like. Wherein the de-energized state of the directional valve 100 corresponds to the condition that the corresponding pilot chamber is not energized with pilot gas, and vice versa.

Still optionally, the first end of the first valve core assembly 11 has a larger diameter than the second end of the first valve core assembly 11, and the fourth end of the second valve core assembly 12 has a larger diameter than the third end of the second valve core assembly 12. Thereby, a larger installation space can be further provided for the respective mechanical spring, so that a larger spring return force can be obtained while ensuring that the valve core assembly is still compact.

The first ejector rod 17 and the second ejector rod 18 further have a first protrusion 172 and a second protrusion 182 respectively, the first protrusion 172 and the second protrusion 182 form the end portions of the first ejector rod 17 and the second ejector rod 18 in the first valve core cavity 112 respectively, and the first mechanical spring 15 and the second mechanical spring 16 are sleeved on the first protrusion 172 and the second protrusion 182 respectively.

By virtue of the design of the first projection 172 and the second projection 182, together with the aforementioned abutment, a stable mounting point is provided for the associated mechanical spring, and a better form fit with the respective end of the respective spring also leads to a better increase in the spring life. It should be appreciated that the length of the two projections is configured such that when the reversing valve 100 is in the final operating position, the two projections remain a distance from the respective plugs to prevent accidental bumping.

Referring to FIG. 3, a schematic of the first spool chamber 112 and the second spool chamber 113 of a reversing valve 100 according to the present invention is shown.

When the first spool assembly 11 and the second spool assembly 12 are in the initial working position, the first abutting portion 171 and the second abutting portion 181 abut against the transition of the first spool cavity 112 and the second spool cavity 113, respectively. That is, at this time, the first abutting portion 171 and the second abutting portion 181 abut against surfaces formed by the difference in the radial dimension between the two valve core chambers, and the surfaces function to restrict the displacement of the carrier rod, and are also referred to as stop surfaces. Due to the design of the stop surface, the maximum stroke of the ejector rod due to the thrust of the spring is limited, and the maximum extending distance of the end part of the ejector rod close to the middle of the reversing valve 100 is also limited, so that the corresponding end parts of the two ejector rods can be ensured to collide with each other in the middle of the reversing valve 100, and the respective return forces are kept balanced.

It should be understood that all of the above preferred embodiments are exemplary and not restrictive, and that various modifications and changes in the specific embodiments described above, which would occur to persons skilled in the art upon consideration of the above teachings, are intended to be within the scope of the invention.

Claims

1. A reversing valve (100), the reversing valve (100) comprising a reversing valve body (1) and two pilot chamber control units (2) connected to each other, the two pilot chamber control units (2) being arranged on both sides or on the same side of the reversing valve body (1) in the length direction of the reversing valve body (1),

the reversing valve body (1) is provided with a first end cover (13) and a second end cover (14) in the length direction,

a valve cavity (101) is arranged in the reversing valve body (1), a first valve core assembly (11) and a second valve core assembly (12) are arranged in the valve cavity (101), the first valve core assembly (11) and the second valve core assembly (12) are opposite to each other in the length direction, the first valve core assembly (11) is provided with a first end part close to the first end cover (13) and a second end part far away from the first end cover (13), the second valve core assembly (12) is provided with a third end part far away from the second end cover (14) and a fourth end part close to the second end cover (14),

the reversing valve body (1) has sealing lips (19) and sealing rings (20), the lips (19) being respectively formed at the outer periphery of the first end of the first valve core assembly (11) and the outer periphery of the fourth end of the second valve core assembly (12), the sealing rings (20) being respectively formed at the outer periphery of the second end of the first valve core assembly (11) and the outer periphery of the third end of the second valve core assembly (12), and the sealing rings (20) being formed thicker than the lips (19) in the radial direction,

a first pilot chamber (114) and a second pilot chamber (115) are respectively provided outside the first end portion of the first valve core assembly (11) and outside the fourth end portion of the second valve core assembly (12), the first pilot chamber (114) and the second pilot chamber (115) are configured to respectively subject the first valve core assembly (11) and the second valve core assembly (12) to thrusts acting toward directions approaching each other in a case where pilot gas is introduced,

it is characterized in that the preparation method is characterized in that,

a through hole is respectively arranged in the first valve core assembly (11) and the second valve core assembly (12), the length direction of the through hole is consistent with the length direction of the first valve core assembly (11) and the second valve core assembly (12), the through hole is divided into a first valve core cavity (112) and a second valve core cavity (113) which are communicated with each other, the first valve core cavity (112) is arranged to be closer to two sides of the reversing valve body (1) relative to the second valve core cavity (113) and is positioned at the lip-shaped ring (19), and the first valve core cavity (112) has a larger radial size than the second valve core cavity (113),

the first valve element assembly (11) and the second valve element assembly (12) each having a first stopper (111) and a second stopper (121), the first stopper (111) and the second stopper (121) respectively closing the first end of the first valve element assembly (11) and the fourth end of the second valve element assembly (12),

the first valve core assembly (11) and the second valve core assembly (12) are respectively provided with a first mechanical spring (15) and a second mechanical spring (16), and are also respectively provided with a first ejector rod (17) and a second ejector rod (18), the length directions of the first mechanical spring (15) and the second mechanical spring (16) are consistent with the length directions of the first valve core assembly (11) and the second valve core assembly (12), the first mechanical spring (15) and the second mechanical spring (16) are respectively arranged in the first valve core cavity (112), the first ejector rod (17) and the second ejector rod (18) are respectively and at least partially arranged in the second valve core cavity (113) in a sliding way, one end of each ejector rod is butted with each other, the other end of each ejector rod extends to the first valve core cavity (112),

the first and second ejector pins (17, 18) having a first abutment (171, 181) and a second abutment (181), respectively, the first and second abutments (171, 181) having a greater radial dimension than the second spool chamber (113), the first mechanical spring (15) being arranged between the first plug (111) and the first abutment (171), the second mechanical spring (16) being arranged between the second plug (121) and the second abutment (181),

the first mechanical spring (15) and the second mechanical spring (16) are configured to continuously exert a thrust on the first plug (111) and the second plug (121), respectively, so that the first valve core assembly (11) and the second valve core assembly (12) can be pushed to an initial working position, respectively, in the case of a first pilot chamber and a second pilot chamber without pilot gas.

2. The reversing valve (100) according to claim 1, wherein the reversing valve (100) is configured as a two-position, three-way valve.

3. Reversing valve (100) according to claim 1, characterized in that the pilot chamber control unit (2) is an electromagnetically or pneumatically controlled pilot chamber control unit (2).

4. The reversing valve (100) according to claim 1, wherein the first and second abutments (171, 181) abut at a transition of the first and second spool cavities (112, 113), respectively, when the first and second spool assemblies (11, 12) are in the initial working position.

5. The reversing valve (100) according to claim 1, wherein the first end of the first spool assembly (11) has a larger diameter than the second end of the first spool assembly (11) and the fourth end of the second spool assembly (12) has a larger diameter than the third end of the second spool assembly (12).

6. The reversing valve (100) according to claim 1, wherein the first ram (17) and the second ram (18) further have a first protrusion (172) and a second protrusion (182), respectively, the first protrusion (172) and the second protrusion (182) forming the end of the first ram (17) and the second ram (18), respectively, at the first spool cavity (112), the first mechanical spring (15) and the second mechanical spring (16) being sleeved on the first protrusion (172) and the second protrusion (182), respectively.