Anti-blow-by four-way valve

Abstract

The utility model provides an anti-blow-by four-way valve, which relates to the technical field of four-way valves and comprises a main valve body, a valve cavity is arranged in the main valve body, a valve seat is fixed on the lower side wall of the valve cavity, a valve core mechanism is slidably mounted on the valve seat, a valve core piston is slidably arranged in the valve cavity and divides two ends of the valve cavity into sealing cavities, and the sealing cavities are communicated with the valve cavity. The valve element mechanism comprises a valve element sliding block, a valve element support, a valve element piston and two sets of symmetrically-arranged sealing assemblies, each sealing assembly comprises a sealing cylinder, a sliding core rod, an extension spring, a sealing piece and two communicating pipelines, the sealing pistons are arranged at the two ends of the sliding core rod, the sealing pieces are installed in communicating grooves in a sliding mode, and the two ends of the sliding core rod are provided with the extension springs. The front side of the sealing piece is fixed to the sliding core rod, and the two communicating pipelines are connected to the two ends of the sealing cylinder respectively. According to the utility model, the sealing fin is pushed to block the blow-by interface through the pressure difference change in the sealing cavity, so as to assist in completing the reversing of the four-way valve.

Description

Technical Field

[0001] The utility model relates to the technical field of four-way valves, in particular to an anti-gas cross-talk four-way valve. Background Art

[0002] The four-way valve is a control valve with four pipe ports. It is an indispensable component in refrigeration equipment. It has a piston installed inside that drives the valve seat to slide in the valve body. The change of air pressure in the air chambers on both sides pushes the piston to slide left and right, so that the valve core switches the connection relationship between the pipe ports, realizing the change between the refrigeration cycle and the heating cycle.

[0003] Wear caused by long-term use will cause the valve core to not move in the right direction, resulting in the three pipe ports being briefly connected during the movement of the valve core, causing air cross-pressure relief, resulting in the high pressure not being high and the low pressure not being low, thereby reducing the displacement distance of the valve core. Utility Model Content

[0004] (1) Technical problems solved

[0005] In view of the deficiencies in the prior art, the present invention provides a four-way valve to prevent cross-flow of gases, which solves the problems raised in the above-mentioned background technology.

[0006] (2) Technical solution

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] 14. The illustrative embodiment of the present invention relates to a four-way valve for preventing cross-flow of gases, comprising a main valve body, a first interface being provided on the upper side of the main valve body, and three second interfaces being provided on the lower side of the group valve body, a valve cavity being provided inside the main valve body, a valve seat being fixed on the lower side wall of the valve cavity, the three second interfaces being communicated with the valve cavity through the valve seat, a valve core mechanism being slidably installed on the valve seat, the valve core mechanism comprising a valve core slider, a valve core bracket, a valve core piston and two groups of symmetrically arranged sealing assemblies, the valve core slider being slidably installed on the upper side of the valve seat, a connecting groove being provided on the lower side of the valve core slider, the connecting groove cover being arranged above the second interface, the valve core bracket being fixed on the valve core slider and extending to both sides, the valve core piston being fixed at both ends of the valve core bracket, the valve core piston being slidably arranged in the valve cavity, dividing the two ends of the valve cavity into sealed cavities.

[0009] Preferably, the sealing assembly includes a sealing cylinder, a sliding core rod, a tension spring, a sealing plate and two connecting pipes. The sealing cylinder is horizontally passed through the two ends of the valve core slider, and sealing pistons are provided at both ends of the sliding core rod. The sliding core rod is slidably placed inside the sealing cylinder, and the sealing plate is slidably installed in the connecting groove. A support beam is fixed on the front side of the sealing plate, a displacement groove is opened in the middle of the sealing cylinder, and the front end of the support beam passes through the displacement groove and is fixed on the sliding core rod. The tension spring is connected between the sliding core rod and the sealing cylinder, and the two connecting pipes are respectively connected to the two ends of the sealing cylinder.

[0010] Preferably, the two communicating pipes are both bent and connected to the valve core piston on the side facing away from the connection position of the sealing cylinder, and the communicating pipes pass through the valve core piston and are communicated with the sealing cavity.

[0011] Preferably, a support ring is integrally formed and fixed in the middle of the sealing cylinder, the sliding core rod slides through the middle of the support ring, a threaded groove is provided on the sliding core rod, a positioning ring is threadedly connected to the sliding core rod, and the two ends of the tension spring are respectively fixed on the support ring and the positioning ring.

[0012] (3) Beneficial effects

[0013] The utility model provides a four-way valve to prevent cross-flow of gases. It has the following beneficial effects:

[0014] 1. In the utility model, the sealing cylinder is connected to the sealing chambers with different pressures at both ends. The pressure difference in the sealing chambers can push the sealing pistons at both ends of the sliding core rod to slide to both sides, thereby pushing the sealing piece fixed on the sliding core rod to slide toward the low-pressure side sealing chamber and slide to the second interface position of the closed gas flow, so that the other two second interfaces are smoothly connected, ensuring the normal operation of the four-way valve, and quickly restoring the pressure in the main valve body of the four-way valve, pushing the valve core slider to the initial position, and when the pressure difference in the sealing chambers on both sides is restored, pushing the sealing piece to return to its original position and tightly adhere to the inner wall of the sealing cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a four-way valve for preventing cross-flow of gases in the utility model;

[0016] Figure 2 This is a cross-sectional view of a four-way valve for preventing cross-flow of gases according to the present invention;

[0017] Figure 3 This is a structural diagram of the valve core mechanism in the utility model;

[0018] Figure 4 This is an exploded view of the sealing component in the present invention;

[0019] Figure 5It is a cross-sectional view of the sealing component in the present invention.

[0020] In the figure: 1. Main valve; 2. First interface; 3. Second interface; 4. Valve seat; 5. Valve chamber; 6. Valve core slider; 7. Valve core bracket; 8. Valve core piston; 9. Connecting groove; 10. Sealing chamber; 11. Sealing cylinder; 12. Sliding core rod; 13. Tension spring; 14. Sealing plate; 15. Connecting pipe; 16. Sealing piston; 17. Support beam; 18. Support ring; 19. Positioning ring; 20. Blocking plate; 21. Connecting slide rod. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] The present invention provides a four-way valve to prevent cross-flow of gases.

[0023] like Figure 1-5 As shown, it includes a main valve body 1, a first interface 2 is opened on the upper side of the main valve body 1, and three second interfaces 3 are opened on the lower side of the group valve body 1. A valve cavity 5 is arranged inside the main valve body 1, and a valve seat 4 is fixed to the lower side wall of the valve cavity 5. The three second interfaces 3 are connected to the valve cavity 5 through the valve seat 4, and a valve core mechanism is slidably installed on the valve seat 4.

[0024] like Figure 2 、 Figure 3 As shown, a valve core mechanism is slidably installed on the valve seat 4, and the valve core mechanism includes a valve core slider 6, a valve core bracket 7, a valve core piston 8 and two sets of symmetrically arranged sealing components. The valve core slider 6 is slidably installed on the upper side of the valve seat 4, and a connecting groove 9 is opened on the lower side of the valve core slider 6. A connecting channel is formed between the connecting groove 9 and the upper side of the valve seat 4. The connecting groove 9 is covered above the second interface 3. The valve core bracket 7 is fixed on the valve core slider 6 and extends to both sides. The valve core piston 8 is fixed at both ends of the valve core bracket 7. The core piston 8 is slidably arranged in the valve cavity 5, dividing the two ends of the valve cavity 5 into sealed cavities 10. The first interface 2 and the three second interfaces 3 can be separated into two groups of pipeline loops through the valve core slider 6. The sealed cavities 10 at both ends are respectively connected to the first interface 2 and the middle second interface 3 through the pre-valve, so that the sealed cavities 10 at both ends form a high-temperature and high-pressure sealed cavity 10 and a low-temperature and low-pressure sealed cavity 10. The pressure difference of the sealed cavities 10 at both ends pushes the valve core pistons 8 at both ends, so that the valve core slider 6 slides left and right to realize the reversal of the four-way valve.

[0025] like Figure 4 、 Figure 5As shown, the sealing assembly includes a sealing cylinder 11, a sliding core rod 12, a tension spring 13, a sealing plate 14 and two communicating pipes 15. The sealing cylinder 11 is horizontally passed through the two ends of the valve core slider 6, and sealing pistons 16 are provided at both ends of the sliding core rod 12. The sliding core rod 12 is slidably placed inside the sealing cylinder 11, and the sealing plate 14 is slidably installed in the communicating groove 9. A support beam 17 is fixed to the front side of the sealing plate 14, and a displacement groove is opened in the middle of the sealing cylinder 11. The front end of the support beam 17 passes through the displacement groove and is fixed on the sliding core rod 12. The tension spring 13 is connected between the sliding core rod 12 and the sealing cylinder 11, and the two communicating pipes 15 are respectively connected to the two ends of the sealing cylinder 11, and the two communicating pipes 15 are both bent and connected to the valve core piston 8 on the side facing away from the connection position of the sealing cylinder 11.

[0026] Working principle: In the present invention, through the above technical solution, taking one of the sealing components as an example, the two communicating pipes 15 are bent and extended, so that the two ends of the sealing cylinder 11 are respectively provided with the valve core piston 8 on the side facing away from the connection and connected with the sealing cavity 10 on that side, and then the sealing pistons 16 at both ends of the sliding core rod 12 are blocked inside the sealing cylinder 11, so that the pressure of the sealing cavities 10 on both sides acts on both sides of the sealing pistons 16 at both ends of the sliding core rod 12. The sliding core rod 12 can be pushed to slide left and right in the sealing cylinder 11 through the change in pressure difference. Under normal conditions, the pressure difference of the sealing cavities 10 at both ends is large, and the sealing plate 14 is pressed outward against the inner wall of the valve core slider 6. The inner wall of the valve core slider 6 contacts the outer side of the sealing plate 14 to play a limiting role. When cross-flow occurs, the high pressure is not high and the low pressure is not low. The pressure difference of the sealing cavities 10 at both ends gradually increases. Gradually decreases, that is, the pressure of the pressure difference on the sealing piston 16 decreases. Under the pulling force of the tension spring 13, the sealing plate 14 slides inward until the sealing plate 14 translates across the second interface 3 on the high-pressure side. During the sliding process, the sealing of the sealing plate 14 and the connecting groove 9 of the valve core slider 6 is guaranteed, which can achieve the effect of isolating and blocking the sealing space formed by the sealing groove and the sealing plate 14 from the second interface 3 on the high-pressure side. At this time, the second interface 3 on the high-pressure side is connected with the first interface 2, and the middle second interface 3 is connected with the second interface 3 on the low-pressure side, forming a temporary circulation channel. After that, the pressure in the sealing chambers 10 on both sides gradually recovers, and continues to push the valve core piston 8 to slide toward the low-pressure side until the valve core slider 6 is completely separated from the second interface 3 on the high-pressure side, completing the reversal. At the same time, as the pressure in the sealing chambers 10 on both sides gradually recovers, the sealing plate 14 is reset under the pulling force of the tension spring 13.

[0027] It is further configured that a support ring 18 is integrally formed and fixed in the middle of the sealing cylinder 11, the sliding core rod 12 slides through the middle of the support ring 18, a threaded groove is provided on the sliding core rod 12, and a positioning ring 19 is threadedly connected to the sliding core rod 12. The two ends of the tension spring 13 are respectively fixed on the support ring 18 and the positioning ring 19. Through the above technical solution, adjusting the position of the positioning ring 19 can adjust the tension of the tension spring 13, thereby adjusting the left and right positions of the sliding core rod 12.

[0028] It is further configured that a horizontal groove is provided on the lower edge of the valve core slider 6, and a sealing piece 20 is slidingly connected in the horizontal groove. When the sliding piece slides to the left over the second interface 3 on the high-pressure side, the sealing piece 20 slides to the low-pressure side and seals above the second interface 3 on the low-pressure side. A connecting slide rod 21 is connected between the sealing piece 20 and the sealing piece 14 on the side facing away from the sealing piece 20. A through groove is provided on the other sealing piece 14 at a position corresponding to the connecting slide rod 21, and the connecting slide rod 21 passes through the through groove and is connected to the rear side of the sealing piece 20.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A four-way valve for preventing cross-flow of gases, comprising a main valve body, a first interface being provided on the upper side of the main valve body, and three second interfaces being provided on the lower side of a valve group body, characterized in that: A valve cavity is provided inside the main valve body, a valve seat is fixed to the lower side wall of the valve cavity, the three second interfaces are connected to the valve cavity through the valve seat, a valve core mechanism is slidably installed on the valve seat, the valve core mechanism includes a valve core slider, a valve core bracket, a valve core piston and two groups of symmetrically arranged sealing components, the valve core slider is slidably installed on the upper side of the valve seat, a connecting groove is provided on the lower side of the valve core slider, the connecting groove cover is provided above the second interface, the valve core bracket is fixed on the valve core slider and extends to both sides, the valve core piston is fixed at both ends of the valve core bracket, and the valve core piston is slidably arranged in the valve cavity to divide the two ends of the valve cavity into sealed cavities.

2. The anti-cross-gas four-way valve according to claim 1, characterized in that: The sealing assembly includes a sealing cylinder, a sliding core rod, a tension spring, a sealing plate and two connecting pipes. The sealing cylinder is horizontally passed through the two ends of the valve core slider, and sealing pistons are provided at both ends of the sliding core rod. The sliding core rod is slidably placed inside the sealing cylinder, and the sealing plate is slidably installed in the connecting groove. A support beam is fixed on the front side of the sealing plate, and a displacement groove is opened in the middle of the sealing cylinder. The front end of the support beam passes through the displacement groove and is fixed on the sliding core rod. The tension spring is connected between the sliding core rod and the sealing cylinder, and the two connecting pipes are respectively connected to the two ends of the sealing cylinder.

3. The anti-cross-gas four-way valve according to claim 2, characterized in that: The two communicating pipes are both bent and connected to the valve core piston on the side facing away from the connection position of the sealing cylinder. The communicating pipes pass through the valve core piston and are communicated with the sealing cavity.

4. The anti-cross-gas four-way valve according to claim 3, characterized in that: A support ring is integrally formed and fixed in the middle of the sealing cylinder, the sliding core rod slides through the middle of the support ring, a threaded groove is opened on the sliding core rod, a positioning ring is threadedly connected to the sliding core rod, and the two ends of the tension spring are respectively fixed on the support ring and the positioning ring.

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