A detection valve

Abstract

The utility model provides a detection valve, which comprises: a valve body, the inner wall of its pipe body forms a support wall and a bent sealing wall; a valve core, which includes a valve rod received in the pipe body, a connecting wall formed at the bottom end of the valve rod, and a flanging bent upward from the connecting wall; the valve rod, the connecting wall and the flanging jointly enclose a sealing groove; a valve rod latch, sleeved on the top end of the valve rod, enabling the first support step to be clamped in the clamping groove, and forming a sliding connection with the pipe body, a first channel is arranged between the valve rod latch and the pipe body; the connecting wall and the flanging are both located below the support wall, and the sealing wall extends into the sealing groove, a second channel is arranged between the sealing wall and the valve rod; a spring, the two ends of which respectively abut against the second support step and the support wall; a sealing ring, installed in the sealing groove and matching the size of the sealing groove, when the valve core is in a reset state, the sealing wall presses against the upper end face of the sealing ring. Compared with the related technology, the detection valve of the utility model has a long service life and stable sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning accessories technology, and in particular to a detection valve used for rapid gas filling of air conditioning evaporators. Background Technology

[0002] Air conditioners have become an essential household appliance, especially during hot weather. The evaporator is the core component of an air conditioner, consisting of a set of U-shaped copper tubes passing through fins. During the manufacturing process, the copper tubes need to be tested for leaks and filled with protective gas, usually using a test valve.

[0003] The detection valve of the related technology includes a valve body containing a valve core, a spring, a sealing ring, and a fixing seat. The valve body has an installation step. The valve core includes a push rod extending axially along the valve body and an annular retaining wall formed at the bottom end of the push rod. The sealing ring is sleeved on the push rod and abuts against the annular retaining wall. The annular retaining wall and the installation step are directly opposite each other and together with the installation step, clamp the sealing ring to achieve a seal. The fixing seat is sleeved on the end of the push rod away from the annular retaining wall and forms a sliding connection. The fixing seat is inserted and fixed to the top end of the valve body. The spring is sleeved on the push rod and its two ends abut against the inner wall of the valve body and the fixing seat, respectively. The fixing seat has a through-hole that communicates with the interior of the valve body.

[0004] However, although the sealing ring divides the valve body into two spaces, the valve core with its annular retaining wall and push rod forms a T-shaped structure. While the valve core provides tension to the sealing ring through elastic restoring force to achieve sealing, the annular retaining wall and the mounting step have excess space relative to the sealing ring. During the normal compression of the sealing ring, the sealing ring is prone to radial irregular deformation, causing problems such as poor air intake or poor reset consistency, which in turn leads to a decrease in sealing performance and a short service life.

[0005] Therefore, it is necessary to provide a new detection valve to solve the above problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a detection valve with a long service life and stable sealing performance.

[0007] To solve the above-mentioned technical problems, this utility model provides a detection valve, comprising:

[0008] The valve body includes a hollow tube open at both ends, an annular support wall formed by the inner wall of the tube extending radially inward, and an annular sealing wall that extends from the inner circumference of the support wall toward the bottom end of the valve body.

[0009] A valve core, housed within a valve body, includes a valve stem extending from the top to the bottom of the valve body, an annular connecting wall extending radially outward from the bottom of the valve stem, an annular flange extending from the outer periphery of the connecting wall toward the top of the valve body, and an annular groove formed by a recess in the outer periphery of the valve stem near the top of the valve body; the valve stem, the connecting wall, and the flange together form an annular sealing groove.

[0010] A valve stem latch includes a ring-shaped lock body, a first support step formed by a downward indentation at the top of the inner circumference of the lock body, and a second support step formed by an upward indentation at the bottom of the outer circumference of the lock body. The inner circumference of the lock body is frustoconical from the position of the first support step to the bottom of the lock body. The lock body is fitted onto the top of the valve stem, causing the first support step to engage with the slot and form an interference fit. The lock body is also inserted into the top of the tube and forms a sliding connection with the tube. A first channel is provided between the lock body and the tube, and a limiting structure is formed at the top of the tube to press against the top of the lock body. The connecting wall and the flange are both located below the support wall, and the sealing wall extends into the sealing groove. A second channel is provided between the sealing wall and the valve stem.

[0011] A spring, wherein the spring is sleeved on the valve stem and its two ends abut against the second support step and the support wall, respectively; and,

[0012] A sealing ring is installed at the bottom of the sealing groove, and the size of the sealing ring matches the size of the sealing groove. When the valve core is in the reset state, the sealing wall presses against the upper end face of the sealing ring.

[0013] Preferably, the valve stem latch further includes a plurality of protrusions arranged at intervals from the outer peripheral side of the lock body, the protrusions abutting and fixing to the inner peripheral side of the tube body; a first channel is formed between two adjacent protrusions.

[0014] Preferably, the valve body further includes an inverted step formed on its inner circumference, the step being closer to the bottom end of the tube body than the valve core; the detection valve further includes a sealing gasket, the sealing gasket being supported and fixed to the step.

[0015] Preferably, the inner circumferential side of the bottom end of the tube is provided with an internal thread.

[0016] Compared with the prior art, the detection valve of this utility model has an annular support wall extending radially inward within the valve body and an annular sealing wall extending from the inner circumference of the support wall toward the bottom of the valve body. It also has an annular connecting wall extending radially outward from the bottom of the valve stem of the valve core and an annular flange extending from the outer circumference of the connecting wall toward the top of the valve body. The valve stem, the connecting wall, and the flange together form an annular sealing groove. A sealing ring is installed at the bottom of the sealing groove, and the size of the sealing ring matches the size of the sealing groove. When the valve core is in the reset state, the sealing wall presses against the upper surface of the sealing ring. With the above structural design, the radial direction of the sealing ring is limited by the side wall of the sealing groove, and the lower end face of the sealing ring along its axial direction is limited by the bottom wall of the sealing groove. When the upper end face of the sealing ring is pressed downward by the sealing wall to achieve sealing, the sealing ring is limited in all directions, which avoids irregular deformation of the sealing ring during the normal compression process, making the air intake smoother. Moreover, because the sealing ring is limited, especially in the radial direction, its deformation and reset are consistent, resulting in better sealing performance and longer service life. Attached Figure Description

[0017] The present invention will now be described in detail with reference to the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description in conjunction with the following drawings. In the drawings:

[0018] Figure 1 This is a cross-sectional structural diagram of an embodiment of the detection valve of this utility model;

[0019] Figure 2 This is a partial exploded view of the structure of the detection valve embodiment of the present invention, wherein the valve body is shown in cross-section. Detailed Implementation

[0020] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0021] The specific embodiments / exemplifications described herein are specific implementations of this utility model, used to illustrate the concept of this utility model, and are illustrative and exemplary, and should not be construed as limiting the implementation methods or scope of this utility model. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those employing any obvious substitutions and modifications to the embodiments described herein, all of which are within the protection scope of this utility model.

[0022] The following descriptions of the embodiments are with reference to the accompanying drawings, illustrating specific embodiments in which the present invention can be implemented. Directional terms used in this invention, such as up, down, front, back, left, right, inside, outside, side, etc., are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustration and understanding of the present invention, and not for limiting the present invention.

[0023] Please refer to Figure 1-2 As shown, this utility model provides a detection valve 100, including a valve body 1, a valve core 2, a valve stem latch 3, a spring 4, and a sealing ring 5.

[0024] The valve body 1 includes a hollow tube 11 with openings at both ends, an annular support wall 12 formed by the inner wall of the tube 11 extending radially inward, and an annular sealing wall 13 that extends from the inner periphery of the support wall 12 toward the bottom end of the valve body 1.

[0025] The valve core 2 is housed within the valve body 1, and includes a valve stem 21 housed within the tube body 11 and extending from the top end of the tube body 11 to the bottom end; an annular connecting wall 22 extending radially outward from the bottom end of the valve stem 21; an annular flange 23 extending from the outer periphery of the connecting wall 22 towards the top end of the valve body 1; and an annular groove 24 formed by a recess in the outer periphery of the valve stem 21 near the top end of the valve body 1.

[0026] The valve stem 21, the connecting wall 22, and the flange 23 together form an annular sealing groove 25.

[0027] The valve stem latch 3 includes a ring-shaped lock body 31, a first support step 32 formed by the downward indentation of the top end of the inner peripheral side of the lock body 31, and a second support step 33 formed by the upward indentation of the bottom end of the outer peripheral side of the lock body 31.

[0028] The inner periphery of the lock body 31 is frustoconical from the position of the first support step 32 to the bottom of the lock body 31. The lock body 31 is sleeved on the top of the valve stem 21, so that the first support step 32 is engaged in the slot and forms an interference fit. The lock body 31 is inserted into the top of the tube body 11 and forms a sliding connection with the tube body 11.

[0029] A first channel 10 is provided between the lock body 31 and the tube body 11, and a limiting structure (not shown) is formed at the top of the tube body 11 and is pressed against the top of the lock body 31, thereby limiting the lock body 31 to the tube body 11, so that it can only slide up and down inside the tube body, but cannot slide up and out of the tube body 11.

[0030] The connecting wall 22 and the flange 23 are both located below the supporting wall 12, and the sealing wall 13 extends into the sealing groove 25. A second channel 20 is provided between the sealing wall 13 and the valve stem 21.

[0031] The first channel 10 connects the outside to the inside of the pipe body 11 through the top of the pipe body 11, and the second channel 20 connects the outside to the inside of the pipe body 11 through the bottom of the pipe body 11. The sealing wall 13 and the sealing groove 25 together isolate the inside of the pipe body 11.

[0032] In this embodiment, specifically, the valve stem latch 3 further includes a plurality of mutually spaced protrusions 34 formed by protrusions from the outer peripheral side of the lock body 31. The protrusions 34 are abutted and fixed to the inner peripheral side of the tube body 11. At this time, a first channel 10 is formed between two adjacent protrusions 34. This structure can effectively strengthen the structural strength of the lock body 31 while forming the first channel 10.

[0033] The spring 4 is sleeved on the valve stem 21 and its two ends abut against the second support step 33 and the support wall 12, respectively.

[0034] The sealing ring 5 is installed at the bottom of the sealing groove 25 and the size of the sealing ring 5 matches the size of the sealing groove 5. When the valve core 2 is in the reset state, the sealing wall 13 presses against the upper end face of the sealing ring 5 to form a sealing barrier.

[0035] To facilitate gas filling using the detection valve 100, in this embodiment, the valve body 1 further includes an inverted step 14 formed on its inner circumference, the step 14 being closer to the bottom end of the pipe body 11 than the valve core 2. The detection valve 100 also includes a sealing gasket 6, which is supported and fixed to the step 14. Thus, when using the detection valve 100, its bottom end is fitted onto the copper pipe connector of the indoor air conditioning unit, and the copper pipe connector abuts against the sealing gasket 6 at the step 14 to form a seal, preventing leakage during gas filling.

[0036] More preferably, the inner circumference of the bottom end of the tube body 11 is provided with an internal thread, which facilitates direct detachable and fixed connection with the tested part during use, thereby improving the reliability of use.

[0037] In use, the detection valve 100 is fixed to the tested component (such as the copper pipe connector of an air conditioner evaporator) via the internal thread at the bottom of the tube body 11. The bottom end of the tested component and the detection valve 100 are sealed by the sealing gasket 6. A special gas gun is then fitted to the top of the tube body 11, and gas is injected from the top of the tube body 11. When the gas is injected, the inner needle of the gas gun abuts against the valve stem 21 and pushes it downward. The spring 4 is compressed, causing the valve stem 21 and the locking body 31 to be pushed downward by the inner needle of the gas gun and move about 5mm. This causes the sealing wall 13 to disengage from the sealing ring 5, and the second channel 20 is opened to allow gas to be injected. After the gas is injected, the gas gun is removed, and the valve stem 21 and the locking body 31 are reset by the spring, so that the tested component and the detection valve 100 are in a sealed state. This allows verification of whether the tested component has a leak. This detection process is existing technology and is not related to the structural innovation of this application, so it will not be described in detail here.

[0038] Compared with the prior art, the detection valve of this utility model has an annular support wall extending radially inward within the valve body and an annular sealing wall extending from the inner circumference of the support wall toward the bottom of the valve body. It also has an annular connecting wall extending radially outward from the bottom of the valve stem of the valve core and an annular flange extending from the outer circumference of the connecting wall toward the top of the valve body. The valve stem, the connecting wall, and the flange together form an annular sealing groove. A sealing ring is installed at the bottom of the sealing groove, and the size of the sealing ring matches the size of the sealing groove. When the valve core is in the reset state, the sealing wall presses against the upper surface of the sealing ring. With the above structural design, the radial direction of the sealing ring is limited by the side wall of the sealing groove, and the lower end face of the sealing ring along its axial direction is limited by the bottom wall of the sealing groove. When the upper end face of the sealing ring is pressed downward by the sealing wall to achieve sealing, the sealing ring is limited in all directions, which avoids irregular deformation of the sealing ring during the normal compression process, making the air intake smoother. Moreover, because the sealing ring is limited, especially in the radial direction, its deformation and reset are consistent, resulting in better sealing performance and longer service life.

[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A detection valve, characterized in that, include: The valve body includes a hollow tube open at both ends, an annular support wall formed by the inner wall of the tube extending radially inward, and an annular sealing wall that extends from the inner circumference of the support wall toward the bottom end of the valve body. A valve core, housed within a valve body, includes a valve stem extending from the top to the bottom of the valve body, an annular connecting wall extending radially outward from the bottom of the valve stem, an annular flange extending from the outer periphery of the connecting wall toward the top of the valve body, and an annular groove formed by a recess in the outer periphery of the valve stem near the top of the valve body; the valve stem, the connecting wall, and the flange together form an annular sealing groove. A valve stem latch includes a ring-shaped lock body, a first support step formed by a downward indentation at the top of the inner circumference of the lock body, and a second support step formed by an upward indentation at the bottom of the outer circumference of the lock body. The inner circumference of the lock body is frustoconical from the position of the first support step to the bottom of the lock body. The lock body is fitted onto the top of the valve stem, causing the first support step to engage with the slot and form an interference fit. The lock body is also inserted into the top of the tube and forms a sliding connection with the tube. A first channel is provided between the lock body and the tube, and a limiting structure is formed at the top of the tube to press against the top of the lock body. The connecting wall and the flange are both located below the support wall, and the sealing wall extends into the sealing groove. A second channel is provided between the sealing wall and the valve stem. A spring, wherein the spring is sleeved on the valve stem and its two ends abut against the second support step and the support wall, respectively; and, A sealing ring is installed at the bottom of the sealing groove, and the size of the sealing ring matches the size of the sealing groove. When the valve core is in the reset state, the sealing wall presses against the upper end face of the sealing ring.

2. The detection valve according to claim 1, characterized in that, The valve stem latch also includes a plurality of protrusions arranged at intervals from the outer peripheral side of the lock body, the protrusions abutting and fixing to the inner peripheral side of the tube body; a first channel is formed between two adjacent protrusions.

3. The detection valve according to claim 1, characterized in that, The valve body also includes an inverted step formed on its inner circumference, the step being closer to the bottom end of the tube body than the valve core; the detection valve also includes a sealing gasket, the sealing gasket being supported and fixed to the step.

4. The detection valve according to claim 1, characterized in that, The inner circumference of the bottom end of the tube is provided with internal threads.

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