Leakage-proof valve for refrigeration equipment

Abstract

The utility model provides an anti-leakage valve for refrigeration equipment, which comprises a first valve seat and a second valve seat, a valve rod is arranged in the first valve seat and the second valve seat, the valve rod comprises a driving part, the driving part is in transmission connection with the first valve seat, one side of the driving part is provided with a plugging part, and the other side of the driving part is provided with a sealing part. The plugging part is arranged in the second valve seat and comprises a plugging rod, a valve clack is arranged at the tail end of the plugging rod, a connecting disc is connected to the outer side of the plugging rod in a sleeving mode, a telescopic isolation pipe and a metal corrugated pipe are arranged between the connecting disc and the valve clack, and the two ends of the metal corrugated pipe are sealed and fixed through welding; the performance of the valve is slightly influenced by temperature difference change, the stability of the sealing performance can be maintained, the sealing effect is good, the service life is long, leakage of Freon is effectively avoided, and the effect of zero leakage at the positions of the valve and the valve rod can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an anti-leakage valve for refrigeration equipment. Background Art

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and adjust and control the parameters (temperature, pressure, and flow) of the conveying medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc.

[0003] Freon is mostly used as the cooling medium of refrigeration equipment. In order to control the flow rate of Freon and the on-off of Freon, a valve needs to be installed in the Freon delivery pipeline of the refrigeration equipment. Freon in the valve will leak out through the gap between the valve stem and the valve seat. The leaked Freon will pollute the surrounding environment, destroy the ozone layer, and cause air pollution. In order to solve this problem, a sealing ring is usually arranged on the valve stem to prevent the leakage of Freon. However, since the sealing ring is generally made of flexible rubber material, and the temperature difference of the refrigeration equipment pipeline often varies greatly, from -60°C to 150°C, such a temperature difference change environment will cause the performance of the sealing ring to be greatly weakened, its service life will also be greatly reduced, and the risk of Freon leakage will be greatly increased. In view of this, overcoming the defects of the above-mentioned prior art is a problem to be solved urgently in this technical field. Utility Model Content

[0004] The utility model provides a leakage-proof valve for refrigeration equipment, aiming to improve the problem that the sealing ring in the existing valve will greatly weaken its performance due to large temperature difference, its service life will also be greatly reduced, and the risk of Freon leakage will be greatly increased.

[0005] In order to achieve the above purpose, the utility model provides a leakage-proof valve for refrigeration equipment, and the specific technical scheme is as follows:

[0006] A leakage-proof valve for refrigeration equipment comprises a first valve seat and a second valve seat, wherein valve stems are installed inside the first valve seat and the second valve seat, wherein the valve stem comprises a driving part, wherein the driving part is transmission-connected to the first valve seat, a sealing part is arranged on one side of the driving part, and the sealing part is arranged inside the second valve seat, wherein the sealing part comprises a sealing rod, a valve disc is arranged at the end of the sealing rod, a connecting disk is sleeved on the outer side of the sealing rod, and a retractable isolation tube is arranged between the connecting disk and the valve disc.

[0007] In one of the embodiments, both end portions of the isolation tube are respectively sealed and fixedly connected to the valve flap and the connecting plate, and one side of the blocking rod passes through the inner cavity of the isolation tube.

[0008] In one embodiment, the isolation tube is a bellows, and the two ends of the bellows are respectively welded and fixed to the valve flap and the connecting plate. The valve flap, the bellows and the connecting plate seal and isolate the part of the sealing rod that is in the second valve seat, and the cooling medium in the second valve seat cannot leak out from the gap between the sealing rod and the valve seat.

[0009] In one embodiment, the driving part includes a driving rod, a driving screw is provided on one side of the driving rod, and the driving screw is threadedly connected to the inner wall of the first valve seat. When the driving rod is rotated, the driving rod can move back and forth inside the first valve seat under the action of the driving screw.

[0010] In one of the embodiments, the blocking rod is provided with an anti-rotation surface, which passes through the connecting disk and cooperates with it. Under the action of the anti-rotation surface, the blocking rod can only slide back and forth in the connecting disk.

[0011] In one embodiment, the driving part and the blocking part are rotatably connected together via a connecting part.

[0012] In one embodiment, the connecting part includes a connecting seat, which is integrally formed with the driving rod. A connecting head is provided at one end of the sealing rod, and the connecting head is inserted into the interior of the connecting seat. A groove is provided on the outer cylindrical surface of the connecting head, and a ball is placed in the groove. A discharge hole for placing the ball is provided at a position corresponding to the groove of the connecting seat, and a sealing top screw is provided on the discharge hole for preventing the ball from leaking outward. The connecting seat is rotatably connected to the connecting head.

[0013] In one embodiment, a sealing plug is provided at one end of the first valve seat away from the second valve seat, and one end of the driving part passes through the sealing plug.

[0014] The beneficial effects of this embodiment are:

[0015] A connecting plate is provided at one end of the valve stem, and the connecting plate is fixed between the first valve seat and the second valve seat. An isolation tube is sealed and fixedly connected between the connecting plate and the valve disc, and the valve stem passes through the inner cavity of the isolation tube, so that the valve stem is isolated by the connecting plate, the isolation tube and the valve disc, and the Freon in the second valve seat can only be on the outside of the isolation tube, and then the Freon is completely isolated in the second valve seat, and the Freon cannot enter around the valve stem, and then it will not leak out of the valve along the valve stem. The isolation tube adopts a metal bellows, and both ends of the metal bellows can be sealed and fixed to the connecting plate and the valve disc by welding. The metal bellows and its two ends are sealed and fixed by welding, and its performance is less affected by temperature differences, and the stability of the sealing performance can be maintained, the sealing effect is good, the service life is long, and the leakage of Freon can be effectively avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is an exploded diagram of a valve provided by an embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the overall structure of a valve provided in an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of a valve stem structure provided in an embodiment of the utility model;

[0020] Figure 4 A schematic diagram of the internal structure of a valve stem provided in an embodiment of the utility model;

[0021] Figure 5 Based Figure 4 A magnified image of point A;

[0022] Figure 6 A schematic diagram of the internal structure of the first valve seat provided in an embodiment of the utility model;

[0023] Figure 7 A schematic diagram of a valve closed state provided by an embodiment of the utility model;

[0024] Figure 8 This is a schematic diagram of the valve opening state provided in an embodiment of the utility model.

[0025] Description of reference numerals:

[0026] 100, first valve seat; 110, sealing plug;

[0027] 200, second valve seat;

[0028] 300, valve stem; 310, driving part; 311, driving rod; 312, driving screw; 320, sealing part; 321, sealing rod; 3211, anti-rotation surface; 322, valve disc; 323, connecting plate; 324, isolation tube; 330, connecting part; 331, connecting seat; 332, connecting head; 3321, groove; 333, ball; 334, sealing top screw. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] The technical solution provided by the embodiment of the utility model is introduced below in conjunction with the accompanying drawings.

[0031] See also Figure 1 and Figure 2 An embodiment of the utility model provides an anti-leakage valve for refrigeration equipment, including a first valve seat 100 and a second valve seat 200. The first valve seat 100 and the second valve seat 200 are fixed together by bolts and can be made of cast iron.

[0032] See also Figure 1 , Figure 3 , Figure 6 and Figure 7 A valve stem 300 is installed in the inner cavity of the first valve seat 100 and the second valve seat 200. The valve stem 300 includes a driving part 310. The driving part 310 includes a driving rod 311. A driving screw 312 is arranged on one side of the driving rod 311. The driving screw 312 is threadedly connected to the inner wall of the first valve seat 100. The driving rod 311 is rotated, and then the driving rod 311 drives the driving screw 312 to rotate. Under the action of the second valve seat 200 and the driving screw 312, the driving rod 311 can move back and forth inside the first valve seat 100. , so that the driving rod 311 can push the blocking rod 321 mentioned below to move back and forth in the second valve seat 200. In addition, a sealing plug 110 is provided at one end of the first valve seat 100 away from the second valve seat 200. The rear end of the driving part 310 passes through the sealing plug 110 and extends to the outside of the first valve seat 100. A sealing gasket (not shown in the figure) is provided between the sealing plug 110, the driving part 310 and the first valve seat 100 to seal the valve stem 300 and the first valve seat 100. The valve stem 300 can be made of stainless steel.

[0033] See also Figure 3 , Figure 4 and Figure 7The front end of the driving part 310 is provided with a blocking part 320, and the blocking part 320 is arranged inside the second valve seat 200. Specifically, the blocking part 320 includes a blocking rod 321, and the end of the blocking rod 321 is provided with a valve flap 322. The valve flap 322 can block the inlet and outlet of the second valve seat 200, thereby achieving the blocking or circulation of the internal Freon, and then realizing the opening or closing of the valve. The valve flap 322 extends forward to the front end. At this time, the valve is in a closed state, and Freon cannot flow (such as Figure 7 As shown), the valve flap 322 retracts to the rear end, and the valve is now in an open state, allowing freon to flow (as shown in FIG. Figure 8 shown).

[0034] See also Figure 4 and Figure 8 It should be noted that a connecting disk 323 is sleeved on the outside of the blocking rod 321, and the connecting disk 323 is fixed on the second valve seat 200. In addition, an anti-rotation surface 3211 is provided on the blocking rod 321, and the anti-rotation surface 3211 penetrates through the connecting disk 323 and cooperates with it. Under the action of the anti-rotation surface 3211, the blocking rod 321 can only slide forward and backward on the connecting disk 323, and the blocking rod 321 cannot rotate with the connecting disk 323, so that the entire valve stem 300 can only move forward and backward, and cannot rotate.

[0035] See also Figure 4 , Figure 7 and Figure 8 A retractable isolation tube 324 is provided between the connection disk 323 and the valve disc 322. The two end portions of the isolation tube 324 are respectively sealed and fixedly connected with the valve disc 322 and the connection disk 323. One side of the blocking rod 321 passes through the inner cavity of the isolation tube 324. Because the connection disk 323 is fixed on the second valve seat 200 and does not move, and the valve disc 322 needs to move back and forth under the push of the valve stem 300 to realize the opening or closing of the valve, the distance between the valve disc 322 and the connection disk 323 is variable. Therefore, the isolation tube 324 fixed between the valve disc 322 and the connection disk 323 needs to have a retractable performance, so as to ensure that the isolation tube 324 is always sealed and fixed with the valve disc 322 and the connection disk 323 to realize its sealing function;

[0036] See also Figure 4 , Figure 7 and Figure 8Preferably, the isolation tube 324 is a bellows, which has good elasticity. The bellows is preferably made of metal. The two ends of the bellows are respectively welded and fixed to the valve flap 322 and the connecting plate 323. The valve flap 322, the bellows and the connecting plate 323 isolate the front end of the valve stem 300. When the valve is opened, the Freon in the second valve seat 200 can only be on the outside of the isolation tube 324, and then the Freon is completely isolated in the second valve seat 200, and the Freon cannot enter the valve stem 300, and then it will not flow along the valve stem 300. 0 leakage to the outside of the valve seat, the two ends of the metal bellows can be sealed and fixed together with the connecting plate 323 and the valve disc 322 by welding. The metal bellows and its two ends are sealed and fixed by welding. Its performance is less affected by temperature differences, and can maintain the stability of sealing performance. The sealing effect is good and the service life is long. It can effectively avoid the leakage of Freon. At the same time, it can also prevent air and external water vapor from entering the valve seat through the gap between the valve and the valve stem under low temperature and negative pressure in the refrigeration system, effectively avoiding the occurrence of ice blockage.

[0037] See also Figure 3 , Figure 4 and Figure 5 The driving part 310 and the blocking part 320 are rotatably connected together through the connecting part 330. Specifically, the connecting part 330 includes a connecting seat 331. The connecting seat 331 and the driving rod 311 are integrally formed. A connecting head 332 is provided at one end of the blocking rod 321. The connecting head 332 is plugged into the inside of the connecting seat 331. A groove 3321 is provided on the outer cylindrical surface of the connecting head 332. A plurality of balls 333 are placed in the groove 3321. An inner groove (not shown in the figure) adapted to the balls 333 is also provided in the interior of the connecting seat 331. The balls 333 are placed It is placed between the groove 3321 and the inner groove, so that the ball 333 clamps the connecting head 332 and the connecting seat 331 to prevent the two from moving forward and backward, thereby playing a connecting and fixing role. The corresponding positions of the connecting seat 331 and the groove 3321 are provided with a discharge hole for placing the ball 333. The diameter of the discharge hole is slightly approximately the diameter of the ball 333. The discharge hole is provided with a sealing top screw 334 to prevent the ball 333 from leaking outward, thereby playing a sealing role. Through this structure, the connecting seat 331 and the connecting head 332 can rotate relative to each other, but the two cannot move relative to each other in the front and rear directions.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A leakage-proof valve for refrigeration equipment, comprising a first valve seat (100) and a second valve seat (200), wherein a valve stem (300) is installed inside the first valve seat (100) and the second valve seat (200), characterized in that: The valve stem (300) includes a driving part (310), and the driving part (310) is transmission-connected to the first valve seat (100). A sealing part (320) is provided on one side of the driving part (310), and the sealing part (320) is provided inside the second valve seat (200). The sealing part (320) includes a sealing rod (321), and a valve flap (322) is provided at the end of the sealing rod (321). A connecting disk (323) is sleeved on the outer side of the sealing rod (321), and a retractable isolation tube (324) is provided between the connecting disk (323) and the valve flap (322).

2. The anti-leakage valve for refrigeration equipment according to claim 1, characterized in that: The two end portions of the isolation tube (324) are respectively sealed and fixedly connected to the valve flap (322) and the connecting plate (323), and one side of the blocking rod (321) passes through the inner cavity of the isolation tube (324).

3. The anti-leakage valve for refrigeration equipment according to claim 2, characterized in that: The isolation tube (324) is a bellows, and the two ends of the bellows are respectively welded to the valve disc (322) and the connecting plate (323). The valve disc (322), the bellows and the connecting plate (323) seal and isolate the part of the sealing rod (321) located at the second valve seat (200), so that the cooling medium in the second valve seat (200) cannot leak out from the gap between the sealing rod (321) and the valve seat.

4. The anti-leakage valve for refrigeration equipment according to claim 1, characterized in that: The driving part (310) includes a driving rod (311), and a driving screw (312) is provided on one side of the driving rod (311). The driving screw (312) is threadedly connected to the inner wall of the first valve seat (100). When the driving rod (311) is rotated, the driving screw (312) can move back and forth inside the first valve seat (100).

5. The anti-leakage valve for refrigeration equipment according to claim 1, characterized in that: The blocking rod (321) is provided with an anti-rotation surface (3211), which passes through the connecting disk (323) and cooperates therewith. Under the action of the anti-rotation surface (3211), the blocking rod (321) can only slide back and forth in the connecting disk (323).

6. The anti-leakage valve for refrigeration equipment according to claim 4, characterized in that: The driving part (310) and the blocking part (320) are rotatably connected together via a connecting part (330).

7. The anti-leakage valve for refrigeration equipment according to claim 6, characterized in that: The connecting portion (330) comprises a connecting seat (331), wherein the connecting seat (331) and the driving rod (311) are integrally formed, a connecting head (332) is provided at one end of the blocking rod (321), and the connecting head (332) is plugged into the interior of the connecting seat (331), a groove (3321) is provided on the outer cylindrical surface of the connecting head (332), a ball (333) is placed in the groove (3321), a discharge hole for placing the ball (333) is provided at a position corresponding to the connecting seat (331) and the groove (3321), a sealing top screw (334) for preventing the ball (333) from leaking outward is provided on the discharge hole, and the connecting seat (331) and the connecting head (332) are rotatably connected.

8. The anti-leakage valve for refrigeration equipment according to claim 1, characterized in that: A sealing plug (110) is provided at one end of the first valve seat (100) away from the second valve seat (200), and one end of the driving part (310) passes through the sealing plug (110).

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