Plug-in two-position four-way reversing valve

Abstract

The invention belongs to the related technical field of hydraulic elements, and discloses a plug-in mounting type two-position four-way reversing valve which comprises a valve cover, a valve sleeve and a valve element. A through hole penetrating up and down is formed in the valve sleeve, and the valve element is arranged in the through hole in an up-down sliding mode. A control cavity is defined by the valve deck, the valve sleeve and the upper portion of the valve element, control oil is contained in the control cavity and pushes the valve element to move downwards from a first position to a second position through pressurization, a reset structure is arranged between the valve element and the valve sleeve, and the reset structure resets the valve element to the first position when the control oil is depressurized. An oil channel penetrating through the lower end of the valve element is formed in the valve element and communicates with an oil return opening T, so that an inner cavity and an outer cavity of the valve element are both filled with hydraulic oil, the environment pressure inside and outside the valve element can be offset, and the acting force borne by the valve element in the working process is effective pressure applied by the control cavity to overcome the reset structure; and stable operation of the reversing valve in a wide pressure range is facilitated, and the environmental pressure adaptability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic components, and more specifically, relates to a plug-in two-position four-way reversing valve. Background Art

[0002] Directional valves are widely used in control systems of mechanical equipment in various fields due to their small size, light weight, and fast response. The traditional two-position four-way directional valve adopts an electromagnetic slide valve structure, which is small in size, simple in structure, reliable in sealing, can be remotely controlled, and has a high level of automation.

[0003] With the continuous deepening of research on deep space, deep earth and deep sea, the demand for the development of hydraulic components for such fields has become more urgent. This field requires equipment to withstand extremely high temperatures and pressures. For example, the working environment in the deep earth field can reach a pressure of 140MPa and a temperature of 200℃. In addition, hydraulic components need to overcome the influence of changes in physical properties such as density, viscosity and bulk elastic modulus of the fluid medium with the external environment in an environment with a large temperature and pressure range, and maintain the performance requirements, working stability and reliability of the system.

[0004] Currently, the two-position four-way reversing valve on the market is only suitable for conventional pressure and temperature environments. The common solution is to combine multiple reversing valves that adapt to different working conditions and use valve series connection to meet the requirements of wide pressure and temperature environments (normal pressure -140MPa, normal temperature -200℃). However, this method causes problems such as larger equipment size, unstable working performance, reduced reliability, and larger leakage, and increases manufacturing and maintenance costs. The application of the above special fields is relatively limited, so it is urgent to invent a two-position four-way reversing valve that adapts to a wide pressure environment to meet the working requirements of special fields. Summary of the invention

[0005] In response to the current defects or improvement needs of hydraulic components that are difficult to adapt to a wide pressure environment, the present invention provides a plug-in two-position four-way reversing valve, whose purpose is to overcome the influence of the environment on the hydraulic components under different pressure environments and to maintain normal working performance and working reliability within a wide pressure change range.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] Provided is a plug-in two-position four-way reversing valve for installation in an installation cavity, comprising a valve cover, a valve sleeve and a valve core; the valve cover is fixedly and sealingly connected to the opening above the installation cavity, the valve sleeve is fixedly connected to the inner wall of the installation cavity, a through hole penetrating up and down is provided inside the valve sleeve, and the valve core is slidably arranged in the through hole up and down; the valve cover, the valve sleeve and the upper part of the valve core enclose a control cavity, and the control cavity contains control oil, and the control oil is used to push the valve core downward from a first position to a second position by increasing pressure, and a reset structure is also connected between the valve core and the valve sleeve, and the reset structure is used to reset the valve core from the second position to the first position when the control oil is depressurized; an oil passage penetrating the lower end of the valve core is provided inside the valve core, and the oil passage is used to communicate with an oil return port T provided on the cavity wall of the installation cavity;

[0008] The lower part of the valve sleeve is radially penetrated by a first radial hole, an intermediate radial hole and a second radial hole in sequence from top to bottom; the intermediate radial hole is used to communicate with an oil inlet P provided on the cavity wall of the mounting cavity, and the oil inlet P is used to provide working oil; a circle of annular groove is provided on the lower outer wall of the valve core, and a first dynamic sealing structure and a second dynamic sealing structure are respectively provided above and below the annular groove between the valve core and the valve sleeve; when the valve core switches between the first position and the second position, the intermediate radial hole remains in communication with the annular groove, and the annular groove selectively communicates with the first radial hole and the second radial hole, so as to transfer working oil to the actuator through the first radial hole or the second radial hole.

[0009] Preferably, the valve core is divided into a piston section and a guide section from top to bottom, the diameter of the piston section is larger than the diameter of the guide section, the through hole is correspondingly divided into a first hole section and a second hole section from top to bottom, the diameter of the first hole section is larger than the diameter of the second hole section, the piston section is slidingly and sealingly connected to the valve sleeve in the first hole section, and the guide section is slidingly and sealingly connected to the valve sleeve in the second hole section through the first dynamic sealing structure and the second dynamic sealing structure; the axial length of the piston section is smaller than the axial length of the first hole section, and the reset structure includes an elastomer, which is sleeved on the valve core and located between the step surfaces where the piston section connects the first hole section and the second hole section.

[0010] Preferably, in the first hole section, a moving cavity is enclosed between the inner wall of the valve sleeve and the valve core, and the moving cavity is communicated with the oil passage.

[0011] Preferably, the first hole section is divided into two hole sections from top to bottom, and the diameter of the hole section of the first hole section located above is larger than the diameter of the hole section located below, the piston section is in matching contact with the hole section located above the first hole section, and the inner wall of the valve sleeve is provided with a retaining ring above the piston section, and the retaining ring and the step surface in the first hole section limit the piston section.

[0012] Preferably, the linear expansion coefficients of the materials used for the valve core and the valve sleeve are consistent.

[0013] Preferably, the outer wall of the valve core is provided with sealing grooves above and below the annular groove, respectively, and the first dynamic sealing structure and the second dynamic sealing structure are respectively made of polymer composite materials by sintering in the sealing grooves.

[0014] Preferably, the first radial hole, the middle radial hole and the second radial hole respectively include a plurality of radial holes evenly distributed on the same cross section; a first annular gap communicating with the first radial hole, an middle annular gap communicating with the middle radial hole and a second annular gap communicating with the second radial hole are sequentially formed between the outer wall of the valve sleeve and the inner wall of the mounting cavity from top to bottom; a first reversing port A, a second reversing port B and the oil inlet P are provided on the cavity wall of the mounting cavity, the first reversing port A is communicated with the first annular gap, the oil inlet P is communicated with the middle annular gap, the second reversing port B is communicated with the second annular gap, the first radial hole is communicated with the actuator through the first annular gap and the first reversing port A, and the second radial hole is communicated with the actuator through the second annular gap and the second reversing port B.

[0015] Preferably, a first sealing ring, an intermediate sealing ring and a second sealing ring are provided in sequence from top to bottom between the outer wall of the lower part of the valve sleeve and the cavity wall of the installation cavity, the first sealing ring is located between the first annular gap and the intermediate annular gap, the intermediate sealing ring is located between the intermediate annular gap and the second annular gap, and the second sealing ring is located below the second annular gap.

[0016] Preferably, the cavity wall of the installation cavity is provided with a control port C connected with the control cavity, a first control sealing ring is provided between the valve cover and the cavity wall of the installation cavity above the control port C, and a second control sealing ring is provided between the valve sleeve and the cavity wall of the installation cavity below the control port C, and the first control sealing ring and the second control sealing ring are used to seal the control cavity.

[0017] Preferably, the valve cover is provided with a first thread on the outer wall, and the valve cover and the installation cavity are fixedly connected by the first thread; the outer wall of the valve sleeve is provided with a second thread above the first radial hole, and the outer wall of the valve sleeve is provided with a boss above the second thread, and a positioning step is provided on the cavity wall of the installation cavity at a position corresponding to the boss, the valve sleeve and the installation cavity are fixedly connected by the second thread, and the assembly height of the valve sleeve is positioned by the contact between the boss and the positioning step.

[0018] In general, the above technical solutions conceived by the present invention have the following technical effects compared with the prior art:

[0019] 1. The plug-in two-position four-way reversing valve proposed in the present invention is provided with a control chamber to act on the valve core through the control oil and a reset structure to act on the valve core, and cooperates with the annular groove on the outer wall of the lower part of the valve core to communicate with the middle radial hole and selectively communicate with the first radial hole and the second radial hole, so as to control the up and down movement of the valve core to realize the two-position four-way reversing; and by arranging the control chamber to hold the control oil, and the oil passage running through the lower end of the valve core to communicate with the oil return port T, the inner and outer cavities of the valve core are filled with hydraulic oil, so that the environmental pressures inside and outside the valve core can offset each other, and the force acting on the valve core during the working process is the effective pressure applied by the control chamber to overcome the reset structure, and the valve core and the valve sleeve do not need to bear the environmental pressure brought by the application environment, thereby realizing the stable operation of the reversing valve under a wide pressure range, and improving its adaptability to environmental pressure;

[0020] 2. The present invention can balance the radial hydraulic pressure on the valve core in the valve sleeve by arranging the first radial hole, the middle radial hole and the second radial hole to include multiple radial holes evenly distributed on the same cross section, thereby avoiding the occurrence of hydraulic clamping;

[0021] 3. In the present invention, the materials of the valve sleeve and the valve core are preferably made of materials with the same linear expansion coefficient, so that when the reversing valve is used in different temperature conditions, the thermal deformation of the valve sleeve and the valve core caused by temperature changes is consistent, which is conducive to the normal cooperation and stable operation of the valve sleeve and the valve core in different temperature environments, so that the reversing valve is suitable for different temperature environments and has wide temperature environment adaptability;

[0022] 4. The first dynamic sealing structure and the second dynamic sealing structure are fixed on the valve core by sintering the polymer composite material, which can improve the stability of the connection between the dynamic sealing structure and the valve core, thereby improving the reliability of the dynamic sealing structure. The sintering fixing form is more suitable for thin-walled valve cores with oil channels inside, which is conducive to reducing the depth of the sealing groove on the basis of ensuring the firmness of the connection, thereby ensuring the structural rigidity of the valve core and improving the service life. In addition, the polymer composite material has good high temperature resistance, which is conducive to the normal sealing of the working oil in a wide temperature environment, ensuring the normal working performance of the plug-in two-position four-way reversing valve;

[0023] 5. In the present invention, the valve cover and the installation cavity, as well as the valve sleeve and the installation cavity, are both connected by threaded fixing, which can ensure assembly strength while facilitating later disassembly and maintenance, has strong interchangeability, and is convenient for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional structure diagram of the plug-in type two-position four-way reversing valve of the present invention;

[0025] Figure 2 It is a schematic diagram of a state in which the valve core of the plug-in two-position four-way reversing valve of the present invention is located in the first position;

[0026] Figure 3 It is a schematic diagram of a state in which the valve core of the plug-in two-position four-way reversing valve of the present invention is located in the second position;

[0027] Figure 4 is a schematic diagram of a hydraulic reversing circuit provided by an embodiment of the present invention;

[0028] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0029] 1- retaining ring, 2-piston sealing ring, 3-valve sleeve, 4-reset structure, 5-radial oil channel, 6-valve core, 7-axial oil channel, 8-first dynamic sealing structure, 9-first radial hole, 10-oil inlet P, 11-middle radial hole, 12-second dynamic sealing structure, 13-second sealing ring, 14-oil return port T, 15-valve cover, 16-valve cover sealing ring, 17-first thread, 18-control chamber, 19-first control sealing ring, 20-control port C, 21-second control sealing ring, 22-second thread, 23-first reversing port A, 24-first sealing ring, 25-annular groove, 26-middle sealing ring, 27-second reversing port B, 28-second radial hole. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] In the embodiment of the present invention, Figure 1 As shown, the plug-in two-position four-way reversing valve is used to be installed in the installation cavity, and includes a valve cover 15, a valve sleeve 3 and a valve core 6, wherein the valve cover 15 and the valve sleeve 3 are stationary parts, and the valve core 6 is a movable part. The valve cover 15 is fixedly connected to the opening above the installation cavity to seal the valve sleeve 3 and the valve core 6 in the installation cavity; the valve sleeve 3 is fixedly connected to the inner wall of the installation cavity. The valve sleeve 3 is provided with a through hole running through the upper and lower parts, and the valve core 6 can be slidably arranged in the through hole up and down. By setting the control chamber 18 to contain the control oil, and the oil channel running through the lower end of the valve core 6 is connected with the oil return port T14, the inner and outer cavities of the valve core 6 are filled with hydraulic oil, so that the environmental pressures inside and outside the valve core 6 can offset each other. During the working process, the force applied to the valve core 6 is the effective pressure applied by the control chamber to overcome the reset structure 4, thereby realizing that the reversing valve can operate stably under a wide pressure range and improving its adaptability to environmental pressure.

[0032] The valve cover 15, the valve sleeve 3 and the upper part of the valve core 6 enclose a control chamber 18, and the control chamber 18 contains control oil, and the control oil is used to push the valve core 6 downward from the first position to the second position by increasing pressure. A reset structure 4 is also connected between the valve core 6 and the valve sleeve 3, and the reset structure 4 is used to reset the valve core 6 from the second position to the first position when the control oil is reduced in pressure. The lower part of the valve sleeve 3 is radially penetrated by a first radial hole 9, an intermediate radial hole 11 and a second radial hole 28 from top to bottom; the intermediate radial hole 11 is used to communicate with the oil inlet P10 provided on the cavity wall of the installation cavity, and the oil inlet P10 is used to provide working oil. The lower outer wall of the valve core 6 is provided with a circle of annular grooves 25, and the annular grooves 25 and the intermediate radial holes 11 remain in a connected state during the movement of the valve core 6. A first dynamic sealing structure 8 and a second dynamic sealing structure 12 are respectively provided above and below the annular groove 25 between the valve core 6 and the valve sleeve 3 to seal the working oil.

[0033] When the control oil pressure increases, such as Figure 3As shown, the oil pressure of the control oil acts on the upper part of the valve core 6, so that the valve core 6 overcomes the elastic force of the reset structure 4, the friction between the components and other resistances to push the valve core 6 downward to the second position. When the valve core 6 is in the second position, the annular groove 25 is connected to the middle radial hole 11 and the second radial hole 28, so that the working oil passes through the oil inlet P10, the middle radial hole 11, the annular groove 25, and the second radial hole 28 in sequence, and then transmits the working oil to the actuator connected to the second radial hole 28; when the oil pressure of the control oil is reduced to the tank pressure, as shown in FIG. Figure 2 As shown, the elastic force of the reset structure 4 overcomes the friction between the components to push the valve core 6 to move upward from the second position to the first position. When the valve core 6 is in the first position, the annular groove 25 connects the intermediate radial hole 11 and the first radial hole 9, so that the working oil passes through the oil inlet P10, the intermediate radial hole 11, the annular groove 25, and the first radial hole 9 in sequence, and then transfers the working oil to the actuator connected to the first radial hole 9.

[0034] Specifically, the valve core 6 is divided into a piston section and a guide section from top to bottom, the diameter of the piston section is larger than the diameter of the guide section, and the through hole is correspondingly divided into a first hole section and a second hole section from top to bottom, the diameter of the first hole section is larger than the diameter of the second hole section. A piston seal ring 2 is provided on the side wall of the piston section, which is made of fluororubber material. The piston section is connected to the valve sleeve 3 in a sliding seal through the piston seal ring 2 in the first hole section, and the guide section is connected to the valve sleeve 3 in a sliding seal through the first dynamic seal structure 8 and the second dynamic seal structure 12 in the second hole section. The axial length of the piston section is smaller than the axial length of the first hole section, and the reset structure 4 includes an elastic body, which is sleeved on the valve core 6 and located between the step surfaces where the piston section connects with the first hole section and the second hole section.

[0035] Specifically, the oil passage includes an axial oil passage 7 and a radial oil passage 5 that are connected to each other. The lower end of the axial oil passage 7 is connected to the oil return port T14. The inner wall of the valve sleeve 3 and the valve core 6 enclose a moving cavity. The radial oil passage 5 is connected to the moving cavity, so that the oil in the oil tank fills the oil passage and the moving cavity through the oil return port T14, so that the internal and external environmental pressures of the moving cavity offset each other, which is beneficial to the stable operation of the valve core 6 under a wide pressure range and improves its adaptability to environmental pressure.

[0036] Specifically, the first hole section is set as a stepped hole again, and the diameter of the hole section located above the first hole section is larger than the diameter of the hole section located below, the piston section is matched and connected with the hole section located above the first hole section, the step surface in the first hole section limits the piston, and the valve core 6 reaches the second position when it moves downward until the lower end of the piston section contacts the step surface in the first hole section; the inner wall of the valve sleeve 3 is provided with a retaining ring 1 above the piston section, and the retaining ring 1 limits the piston, and the valve core 6 reaches the first position when it moves upward to contact the retaining ring 1. The retaining ring 1 can be made of 65Mn spring steel or other materials with higher strength and toughness, which are not limited here.

[0037] Specifically, the valve sleeve 3 and valve core 6 are made of high temperature resistant materials with equal or similar linear expansion coefficients, such as 17-4PH stainless steel and Monel K500 alloy, so that when the reversing valve is used in different temperature environments between room temperature and 200°C, the thermal deformation caused by temperature changes on the valve sleeve 3 and valve core 6 is consistent, which is conducive to the normal coordination and stable operation of the valve sleeve 3 and valve core 6 under different temperature environments, making the reversing valve suitable for different temperature environments and making the reversing valve adaptable to wide temperature environments. The selection of specific materials needs to preset the allowed difference threshold according to the actual application scenario, so as to select materials to ensure normal working performance within the actual temperature change range, which is not limited here.

[0038] In some embodiments, sealing grooves are provided above and below the annular groove 25, respectively, and the depth of the sealing grooves is greater than the depth of the annular groove 25. The first dynamic sealing structure 8 and the second dynamic sealing structure 12 are respectively composed of polymer composite materials, which have high mechanical strength, high temperature resistance, and corrosion resistance. They are sintered in the sealing grooves to ensure that the working oil is sealed under a wide pressure and temperature environment. The first dynamic sealing structure 8 and the second dynamic sealing structure 12 can also be composed of other composite materials with high mechanical strength, high temperature resistance, and corrosion resistance, such as carbon fiber reinforced polyetheretherketone, modified polyamideimide, etc., which are not limited here. The annular groove 25 between the first dynamic sealing structure 8 and the second dynamic sealing structure 12 contains working oil. Since the gap between the inside of the valve sleeve 3 and the valve core 6 is filled with oil in the oil tank, the pressure on the first dynamic sealing structure 8 and the second dynamic sealing structure 12 is reduced to the pressure difference between the working oil pressure and the oil pressure in the oil tank.

[0039] As a further preferred embodiment, the first radial hole 9, the middle radial hole 11 and the second radial hole 28 respectively include a plurality of radial holes evenly distributed on the same cross section, so that the radial hydraulic pressures on the valve core 6 offset each other, thereby avoiding the hydraulic clamping of the valve core 6. A first annular gap communicating with the first radial hole 9, an intermediate annular gap communicating with the middle radial hole 11 and a second annular gap communicating with the second radial hole 28 are formed in sequence from top to bottom between the outer wall of the valve sleeve 3 and the inner wall of the installation cavity; a first reversing port A 23, a second reversing port B 27 and an oil inlet P10 are provided on the cavity wall of the installation cavity, the first reversing port A 23 is communicated with the first annular gap, the second reversing port B 27 is communicated with the second annular gap, the first radial hole 9 is communicated with the actuator through the first annular gap and the first reversing port A 23, the second radial hole 28 is communicated with the actuator through the second annular gap and the second reversing port B 27; the oil inlet P10 is communicated with the middle radial hole 11 through the intermediate annular gap.

[0040] Specifically, a first sealing ring 24, an intermediate sealing ring 26 and a second sealing ring 13 are arranged in sequence from top to bottom between the outer wall of the lower part of the valve sleeve 3 and the cavity wall of the installation cavity, wherein the first sealing ring 24 is located between the first annular gap and the intermediate annular gap, the intermediate sealing ring 26 is located between the intermediate annular gap and the second annular gap, and the second sealing ring 13 is located below the second annular gap. The first sealing ring 24, the intermediate sealing ring 26 and the second sealing ring 13 all adopt a static sealing method, and a hole O-type sealing ring made of fluororubber material is selected to prevent oil leakage.

[0041] In some embodiments, the cavity wall of the installation cavity is provided with a control port C20 communicating with the control cavity 18, a first control seal ring 19 is provided above the control port C20 between the valve cover 15 and the cavity wall of the installation cavity, and a second control seal ring 21 is provided below the control port C20 between the valve sleeve 3 and the cavity wall of the installation cavity, and the first control seal ring 19 and the second control seal ring 21 are used to seal the control cavity 18. A boosting device is externally connected through the control port C20 to provide boosted control oil to the control cavity 18.

[0042] In some embodiments, the outer wall of the valve cover 15 is provided with a first thread 17 above the first control seal ring 19, and the valve cover 15 and the installation cavity are fixedly connected through the first thread 17, which can reduce the impact of a wide temperature environment on the structure and the risk of thermal deformation, and facilitate subsequent disassembly and maintenance. A valve cover seal ring 16 is provided above the first thread 17, and together with the first control seal ring 19, a secondary radial seal is achieved between the valve cover 15 and the inner wall of the installation cavity. Both shaft seal rings are static seals, which can effectively prevent the leakage of control oil and block the intrusion of foreign impurities such as dust and moisture into the equipment. At the same time, its elasticity and plasticity can compensate for the error between the valve cover 15 and the inner wall of the installation cavity, and prevent the valve cover 15 from axial movement.

[0043] In some embodiments, the outer wall of the valve sleeve 3 is provided with a second thread 22 above the first radial hole 9, and the outer wall of the valve sleeve 3 is provided with a boss above the second thread 22. A positioning step is provided on the cavity wall of the mounting cavity corresponding to the assembly height of the boss. The valve sleeve 3 and the mounting cavity are in contact with each other through the boss and the positioning step to achieve the positioning of the assembly height of the valve sleeve 3, and a fixed connection is achieved through the second thread 22, which ensures the assembly strength while facilitating subsequent disassembly and maintenance, has strong interchangeability, and is convenient for mass production.

[0044] As a further preferred embodiment, the plug-in two-position four-way reversing valve is installed in the installation cavity, and the installation cavity is provided in the valve block with an external electromagnetic pilot valve. The input end of the electromagnetic pilot valve is connected to the boosting device, and the output end is connected to the control port C20, which is used to control the on-off of the boosting control oil provided by the boosting device. The connection relationship is as follows: Figure 4 As shown, when the electromagnetic pilot valve is in a closed state, the electromagnetic pilot valve is unloaded, the oil pressure in the control chamber 18 decreases, the reset structure 4 overcomes the friction force of the sealing ring, the oil resistance, etc. to reset, and drives the valve core 6 to move upward to the first position, and the working oil flows to the actuator connected to the first reversing port A 23 through the first radial hole 9, and the oil in the actuator connected to the second reversing port B 27 flows back to the inside of the valve sleeve 3 through the second radial port and communicates with the return oil port T14; when the electromagnetic pilot valve is in an open state, the pressurized control oil flows into the control chamber 18, so that the oil pressure in the control chamber 18 is higher than the oil pressure at the return oil port T14, so that the valve core 6 overcomes the elastic force of the reset structure 4, the friction force of the sealing ring, etc. and moves downward to the second position, and the working oil flows to the actuator connected to the second reversing port B27 through the second radial hole 28, and the oil in the actuator connected to the first reversing port A 23 flows back to the inside of the valve sleeve 3 through the first radial port and communicates with the return oil port T14. In this embodiment, a valve block and an electromagnetic pilot valve are used in conjunction with the present invention. Obviously, the present invention can also be used in conjunction with other related structures, instruments or equipment. Therefore, the connection structure and simple changes of the valve block and the electromagnetic pilot valve cannot be understood as limitations to the present invention.

[0045] The valve sleeve 3 and valve core 6 provided in this embodiment are made of high temperature resistant materials with equal or similar linear expansion coefficients, and the inner and outer cavities of the valve core 6 are filled with hydraulic oil so that the environmental pressures inside and outside the valve core 6 offset each other. It is suitable for deep-earth fields where the ambient temperature and ambient pressure can vary in a wide range, such as in the fields of drilling and logging. When the plug-in two-position four-way reversing valve goes deep into the well, its environment rises from the normal temperature and pressure on the surface to the high temperature and high pressure underground. The ambient temperature in this field varies from room temperature to 200°C, and the ambient pressure varies from 0 to 140MPa, or even higher.

[0046] The valve sleeve 3 and valve core 6 provided in this embodiment are made of high temperature resistant materials with equal or similar linear expansion coefficients and are also suitable for deep space fields where the ambient temperature varies in a wide range and the ambient pressure is relatively stable. For example, in the field of space stations, the plug-in two-position four-way reversing valve may be inside or outside the space station, the station is in a normal pressure environment, and the station is in a high vacuum environment. When going deep into the space environment of about 400 km from the ground, under the direct irradiation of sunlight, the surface temperature of the space station can reach about 150°C, so the ambient temperature of the plug-in two-position four-way reversing valve can reach 150°C.

[0047] The inner and outer cavities of the valve core 6 described in this embodiment are filled with hydraulic oil so that the environmental pressures inside and outside the valve core 6 offset each other. It is also suitable for deep-sea fields where the environmental pressure varies in a wide range and the environmental temperature is relatively stable, such as the seabed exploration field. During the operation of the plug-in two-position four-way reversing valve on the seabed, the working pressure can gradually deepen from the normal pressure environment at sea level to a high-pressure environment of about 120MPa, and the diving depth is about 11,000m under the sea. With the change of the depth of the sea water, the environmental pressure changes in the range of 0 to 120MPa, and the environmental temperature changes in the range of room temperature to about 6°C.

[0048] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plug-in two-position four-way reversing valve, used for installation in an installation cavity, It is characterized in that The valve body (15) comprises a valve cover (15), a valve sleeve (3) and a valve core (6); the valve cover (15) is fixedly and sealingly connected to the opening above the installation cavity; the valve sleeve (3) is fixedly connected to the inner wall of the installation cavity; a through hole is provided inside the valve sleeve (3) and runs through it from top to bottom; the valve core (6) is slidably arranged in the through hole; the valve cover (15), the valve sleeve (3) and the upper part of the valve core (6) form a control cavity (18); the control cavity (18) contains control oil, and the control oil is used to push the valve core (6) to move downward from a first position to a second position by increasing pressure; a reset structure (4) is also connected between the valve core (6) and the valve sleeve (3); the reset structure (4) is used to reset the valve core (6) from the second position to the first position when the control oil is depressurized; an oil passage is provided inside the valve core (6) and runs through the lower end of the valve core (6); the oil passage is used to communicate with an oil return port T (14) provided on the cavity wall of the installation cavity; The lower part of the valve sleeve (3) is radially penetrated by a first radial hole (9), an intermediate radial hole (11) and a second radial hole (28) in sequence from top to bottom; the intermediate radial hole (11) is used to communicate with an oil inlet (10) provided on the cavity wall of the mounting cavity, and the oil inlet P (10) is used to provide working oil; the lower outer wall of the valve core (6) is provided with a circle of annular grooves (25), and a first dynamic sealing structure (8) and a second dynamic sealing structure (12) are respectively provided above and below the annular grooves (25) between the valve core (6) and the valve sleeve (3); when the valve core (6) switches between the first position and the second position, the intermediate radial hole (11) and the annular groove (25) remain in a communicating state, and the annular groove (25) selectively communicates with the first radial hole (9) and the second radial hole (28) so as to transfer working oil to the actuator through the first radial hole (9) or the second radial hole (28).

2. The cartridge-type two-position four-way reversing valve according to claim 1, It is characterized in that The valve core (6) is divided into a piston section and a guide section from top to bottom, the diameter of the piston section is larger than the diameter of the guide section, the through hole is correspondingly divided into a first hole section and a second hole section from top to bottom, the diameter of the first hole section is larger than the diameter of the second hole section, the piston section is slidingly and sealingly connected to the valve sleeve (3) in the first hole section, and the guide section is slidingly and sealingly connected to the valve sleeve (3) in the second hole section through the first dynamic sealing structure (8) and the second dynamic sealing structure (12); the axial length of the piston section is smaller than the axial length of the first hole section, and the reset structure (4) comprises an elastomer, which is sleeved on the valve core (6) and located between the step surfaces where the piston section is connected to the first hole section and the second hole section.

3. The cartridge-type two-position four-way reversing valve according to claim 2, It is characterized in that In the first hole section, a moving cavity is formed between the inner wall of the valve sleeve (3) and the valve core (6), and the moving cavity is communicated with the oil passage.

4. The cartridge-type two-position four-way reversing valve according to claim 2, It is characterized in that The first hole section is divided into two hole sections from top to bottom, and the diameter of the hole section located above the first hole section is larger than the diameter of the hole section located below. The piston section is in matching contact with the hole section located above the first hole section. The inner wall of the valve sleeve (3) is provided with a retaining ring (1) above the piston section. The retaining ring (1) and the step surface in the first hole section limit the piston section.

5. The cartridge-type two-position four-way reversing valve according to any one of claims 1 to 4, It is characterized in that The linear expansion coefficients of the materials used for the valve core (6) and the valve sleeve (3) are consistent.

6. The cartridge-type two-position four-way reversing valve according to any one of claims 1 to 4, It is characterized in that The outer wall of the valve core (6) is provided with sealing grooves above and below the annular groove (25), respectively. The first dynamic sealing structure (8) and the second dynamic sealing structure (12) are respectively made of polymer composite materials by sintering in the sealing grooves.

7. The cartridge-type two-position four-way reversing valve according to any one of claims 1 to 4, It is characterized in that The first radial hole (9), the intermediate radial hole (11) and the second radial hole (28) respectively include a plurality of radial holes evenly distributed on the same cross section; a first annular gap communicating with the first radial hole (9), an intermediate annular gap communicating with the intermediate radial hole (11) and a second annular gap communicating with the second radial hole (28) are formed in sequence from top to bottom between the outer wall of the valve sleeve (3) and the inner wall of the mounting cavity; a first reversing port A (23), a second reversing port B (27) and the oil inlet P (10) are provided on the cavity wall of the mounting cavity; the first reversing port A (23) is communicated with the first annular gap, the oil inlet P (10) is communicated with the intermediate annular gap, the second reversing port B (27) is communicated with the second annular gap, the first radial hole (9) is communicated with the actuator through the first annular gap and the first reversing port A (23), and the second radial hole (28) is communicated with the actuator through the second annular gap and the second reversing port B (27).

8. The cartridge-type two-position four-way reversing valve according to claim 7, It is characterized in that A first sealing ring (24), an intermediate sealing ring (26) and a second sealing ring (13) are provided in sequence from top to bottom between the outer wall of the lower part of the valve sleeve (3) and the cavity wall of the installation cavity, wherein the first sealing ring (24) is located between the first annular gap and the intermediate annular gap, the intermediate sealing ring (26) is located between the intermediate annular gap and the second annular gap, and the second sealing ring (13) is located below the second annular gap.

9. The cartridge-type two-position four-way reversing valve according to claim 1, It is characterized in that The cavity wall of the installation cavity is provided with a control port C (20) connected to the control cavity (18); a first control sealing ring (19) is provided between the valve cover (15) and the cavity wall of the installation cavity above the control port C (20); a second control sealing ring (21) is provided between the valve sleeve (3) and the cavity wall of the installation cavity below the control port C (20); the first control sealing ring (19) and the second control sealing ring (21) are used to seal the control cavity (18).

10. The cartridge-type two-position four-way reversing valve according to claim 1, It is characterized in that The valve cover (15) is provided with a first thread (17) on the outer wall, and the valve cover (15) and the installation cavity are fixedly connected by the first thread (17); the outer wall of the valve sleeve (3) is provided with a second thread (22) above the first radial hole (9), and the outer wall of the valve sleeve (3) is provided with a boss above the second thread (22), and a positioning step is provided on the cavity wall of the installation cavity at a position corresponding to the boss, and the valve sleeve (3) and the installation cavity are fixedly connected by the second thread (22), and the assembly height of the valve sleeve (3) is positioned by the contact between the boss and the positioning step.

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