阅读说明：本技术 一种膨胀阀的氦检装置及检验方法 (Helium detection device and detection method for expansion valve ) 是由 俞其昌 严雅灯 陈宇涛 张艺耀 施孝哉 于 2021-06-21 设计创作，主要内容包括：本发明提供一种膨胀阀的氦检装置及检验方法,所述装置包括气缸、箱体,箱体的顶面连接所述气缸,箱体的侧面设有一面与箱体可分离,所述箱体内设有直滑轨、箱块、门形滑块、底座和底盘,所述气缸连接所述箱块,箱块一侧设有第一卡块,所述第一卡块沿所述直滑轨方向移动,所述门形滑块内设有所述底座滑动的滑槽,所述底座下方设有所述底盘；本发明的检验装置是针对在垂直面布置的膨胀阀孔的膨胀阀设计的一种密封测试,通过采用模具抽芯结构的原理利用气缸带动滑块移动实现对膨胀阀的密封,结构简单易于实现；本发明是通过门形滑块的挤压,将镶块连接的第二密封塞挤压紧靠膨胀阀孔内,保证了该装置处于绝对的密封中。(The invention provides a helium detection device of an expansion valve and a detection method, wherein the device comprises an air cylinder and a box body, the top surface of the box body is connected with the air cylinder, one side of the side surface of the box body is provided with a straight slide rail, a box block, a door-shaped slide block, a base and a chassis, the air cylinder is connected with the box block, one side of the box block is provided with a first fixture block, the first fixture block moves along the direction of the straight slide rail, the door-shaped slide block is internally provided with a slide groove for sliding the base, and the chassis is arranged below the base; the inspection device disclosed by the invention is a sealing test designed for the expansion valve of the expansion valve hole arranged on the vertical surface, the expansion valve is sealed by adopting the principle of a mold core-pulling structure and utilizing the air cylinder to drive the sliding block to move, and the structure is simple and easy to realize; the invention extrudes the second sealing plug connected with the insert to be tightly close to the hole of the expansion valve by the extrusion of the door-shaped sliding block, thereby ensuring that the device is in absolute sealing.)

1. The helium detection device of the expansion valve is characterized by comprising an air cylinder and a box body, wherein the top surface of the box body is connected with the air cylinder, one side of the side surface of the box body is provided with a straight slide rail, a box block, a door-shaped slide block, a base and a chassis, the air cylinder is connected with the box block, one side of the box block is provided with a first clamping block, the first clamping block is arranged along the direction of the straight slide rail to move, the door-shaped slide block is internally provided with a sliding chute of the base, and the chassis is arranged below the base.

2. The helium testing device for an expansion valve as claimed in claim 1, wherein the tank block is L-shaped, a U-shaped groove is provided on a long side portion of the L-shape of the tank block, a depth of a curved bottom portion of the U-shape of the U-shaped groove is greater than depths of other grooves of the U-shaped groove, the cylinder is placed on the curved bottom portion of the U-shape of the U-shaped groove, and a thimble connected to the cylinder is provided with a protruding end portion, and the protruding end portion is caught in the U-shaped groove.

3. The helium testing device for the expansion valve as claimed in claim 2, wherein two connecting posts are provided on the L-shaped long side portion of the block, the connecting posts cross both ends of the L-shaped long side portion of the block and are connected to the first clamping block, two rectangular through holes are provided on the L-shaped short side portion of the block, and a position-limiting post is provided in each of the rectangular through holes.

4. The helium testing device for the expansion valve as claimed in claim 3, wherein a rectangular block is provided at the junction of the L-shaped long side portion of the tank block and the L-shaped short side portion of the tank block, the rectangular block is fixedly connected to the tank block, a T-shaped groove is provided in the rectangular block, a matching T-shaped projection is provided in the T-shaped groove, and the T-shaped projection is placed on the upper top surface of the gate-shaped slider.

5. The helium testing device for the expansion valve as claimed in claim 4, wherein the slot comprises a rectangular chute and an inclined chute, the rectangular chute is arranged on one side of the gate-shaped slider, the section of the rectangular chute on the upper top surface of the gate-shaped slider is trapezoidal, the inclined chute is arranged on the other side of the gate-shaped slider, the inclined chute is connected with a U-shaped through hole on the upper top surface of the gate-shaped slider, and a backing plate is arranged below the U-shaped through hole.

6. The helium testing device of an expansion valve as claimed in claim 5, wherein the backing plate is fixedly connected to the gate-shaped slider, a waist-shaped hole is formed in the backing plate, a limiting pull rod is arranged in the waist-shaped hole, a spring is arranged on the limiting pull rod, and the limiting pull rod moves in the waist-shaped hole.

7. The helium testing device of an expansion valve as claimed in claim 5, wherein the shape of the base is identical to the shape of "L" at 90 degrees counterclockwise, a rectangular protruding block is provided on the L-shaped short side of the base, the rectangular protruding block is matched with the rectangular sliding groove of the gate-shaped slider, a rectangular groove and two circular grooves are provided on the L-shaped long side of the base, a first sealing plug matched with the expansion valve hole is provided in the circular groove, and an inclined slider is provided in the rectangular groove.

8. The helium testing device for the expansion valve as claimed in claim 7, wherein the inclined sliding block is provided with an inclined protrusion block matched with the inclined sliding groove, the inclined protrusion block slides in the inclined sliding groove, the cross section of the bottom of the inclined sliding block is rectangular, the inclined sliding block slides in the rectangular groove, an insert block is arranged in the inclined sliding block, two second sealing plugs are arranged on the insert block, and the size of the second sealing plugs is matched with the size of the expansion valve hole.

9. The helium testing device of an expansion valve as claimed in claim 1, wherein the base plate is provided with a support column, and the base, the base plate and the support column are respectively provided with a corresponding through hole for placing a pipeline, and the pipeline is used for connecting the expansion valve and the vacuum pumping device.

10. A method of testing helium quality using an expansion valve according to any one of claims 1 to 9, comprising the steps of:

(1) the expansion valve hole is sealed under the action of the cylinder;

(2) air in the box body and the expansion valve is extracted to reach a vacuum state and simultaneously connected with a helium mass spectrometer;

(3) filling helium into the expansion valve;

(4) and analyzing whether the expansion valve leaks or not according to the helium mass spectrometer detection helium gas value.

Technical Field

The invention relates to the field of detection devices, in particular to a helium detection device and a helium detection method for an expansion valve.

Background

An expansion valve is an important component in a refrigeration system and is typically mounted between the reservoir and the evaporator. The expansion valve enables the medium-temperature high-pressure liquid refrigerant to be low-temperature low-pressure wet steam through throttling, then the refrigerant absorbs heat in the evaporator to achieve the refrigeration effect, and the expansion valve controls the flow of the valve through the change of the superheat degree of the tail end of the evaporator to prevent the phenomena of insufficient utilization of the area of the evaporator and cylinder knocking. In order to ensure the tightness of the expansion valve, a vacuum box method is generally adopted for leak detection in the prior art.

The vacuum box method is that the workpiece to be detected is filled with helium gas with specified pressure and then placed in a vacuum box with proper size, then the vacuum box is vacuumized to the leakage detection vacuum degree, and a leak detector measures helium signals in the vacuum box. If the workpiece leaks, helium gas enters the vacuum box through the leak hole to be detected; for example, chinese patent CN206281618U discloses a vacuum box helium leak detection system, in which a vacuum box is erected at a workpiece conveying station to be detected for leaking, a chassis for bearing the workpiece to be detected for leaking is arranged on the station, and a lifting cylinder for lifting the workpiece to be detected for leaking into the vacuum box is arranged below the chassis; the work piece will be waited to examine through the second sealing plug of releasing the cylinder and sealed, connects pump package and helium mass spectrometer leak detector at last and leak hunting, but this technical scheme need be equipped with the work piece and carry the workstation and carry, and the operation is more complicated, designs a more simple leak hunting structure and is the problem that this technical staff will solve.

Disclosure of Invention

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides a helium detection device of an expansion valve and a detection method, wherein the device comprises an air cylinder and a box body, the top surface of the box body is connected with the air cylinder, one side of the side surface of the box body is provided with a straight slide rail, a box block, a door-shaped slide block, a base and a chassis, the air cylinder is connected with the box block, one side of the box block is provided with a first fixture block, the first fixture block moves along the direction of the straight slide rail, a clamping groove for sliding the base is formed in the door-shaped slide block, and the chassis is arranged below the base.

Preferably, a circular through hole is formed in one side of the box body, a vacuumizing device is connected in the circular through hole, the vacuumizing device adopts the prior art, the vacuumizing device is not protected by the invention, and detailed description is omitted.

Preferably, the straight slide rail is fixedly connected in the box body.

Furthermore, the box block is L-shaped, a U-shaped groove is formed in the L-shaped long edge portion of the box block, the groove depth of the U-shaped radian bottom portion of the U-shaped groove is larger than the other groove depths of the U-shaped groove, the air cylinder is placed at the U-shaped radian bottom of the U-shaped groove, a thimble connected with the air cylinder is provided with a protruding end portion, and the protruding end portion is clamped in the U-shaped groove.

Furthermore, two connecting columns are arranged on the L-shaped long side portion of the box block, the connecting columns penetrate through two ends of the L-shaped long side portion of the box block and are connected with the first clamping block, two rectangular through holes are formed in the L-shaped short side portion of the box block, and a limiting column is arranged in each rectangular through hole.

Preferably, spacing post below is equipped with the fixed block, be equipped with the through-hole in the fixed block, spacing post can alternate in the through-hole of fixed block, the fixed block is connected the second fixture block, second fixture block fixed connection straight slide rail, second fixture block and first fixture block shape size are unanimous, and when first fixture block slided along straight slide rail, spacing post alternates and is in the through-hole of fixed block, prevent that the case piece from having slight deviation at the removal in-process.

Furthermore, the junction of the L-shaped long edge part of the box block and the L-shaped short edge part of the box block is provided with a rectangular block, the rectangular block is fixedly connected with the box block, a T-shaped groove is arranged in the rectangular block, a matched T-shaped convex block is arranged in the T-shaped groove, and the T-shaped convex block is arranged on the upper top surface of the door-shaped sliding block.

Further, the draw-in groove includes rectangle spout and oblique spout, one side of door shape slider is equipped with the rectangle spout, the rectangle spout is in the cross-section of the last top surface of door shape slider is trapezoidal, the opposite side of door shape slider is equipped with oblique spout, oblique spout be in U-shaped through-hole is connected to the last top surface department of door shape slider, U-shaped through-hole has a backing plate.

Further, backing plate fixed connection the door-shaped slider, be equipped with waist shape hole in the backing plate, waist shape downthehole spacing pull rod that is equipped with, be equipped with the spring on the spacing pull rod, spacing pull rod removes in waist shape hole.

Furthermore, the shape of the base is consistent with that of the L-shaped block at 90 degrees anticlockwise, a rectangular protruding block is arranged on the L-shaped short side of the base and is matched with the rectangular sliding groove of the door-shaped sliding block, a rectangular groove and two circular grooves are arranged on the L-shaped long side of the base, a first sealing plug matched with the expansion valve hole is arranged in each circular groove, and an inclined sliding block is arranged in each rectangular groove.

Furthermore, an inclined protruding block matched with the inclined sliding groove is arranged on the inclined sliding block, the inclined protruding block slides in the inclined sliding groove, the cross section of the bottom of the inclined sliding block is rectangular, the inclined sliding block slides in the rectangular groove, an insert is arranged in the inclined sliding block, two second sealing plugs are arranged on the insert, and the size of each second sealing plug is matched with that of the corresponding expansion valve hole.

Preferably, the spring on the limiting pull rod ensures that the base plate and the insert block are always in a tensioned state, so that the door-shaped sliding block and the base are also always in a tensioned state, and the second sealing plug is always abutted against the expansion valve.

Preferably, the insert ensures that the central positions of the second sealing plug and the expansion valve hole are kept on the same horizontal line, and if the second sealing plug is not sealed with the expansion valve hole, the limiting pull rod moves in the waist-shaped hole until the central positions of the second sealing plug and the expansion valve hole are adjusted on the same horizontal line.

Preferably, the rectangular protruding block and the inclined sliding block on the base slide along the rectangular sliding groove and the inclined sliding groove of the door-shaped sliding block respectively.

Furthermore, a support column is arranged on the chassis, corresponding through holes for placing pipelines are respectively arranged on the base, the chassis and the support column, and the pipelines are used for connecting the expansion valve and the vacuum-pumping device.

Preferably, the step of sealing the device is:

(1) placing the expansion valve on the base;

(2) sealing the box body;

(3) under the action of the cylinder, the door-shaped sliding block is extruded downwards and moves along the direction of the rectangular protruding block on the base;

(4) the inclined sliding block slides in the rectangular groove under the extrusion of the door-shaped sliding block to drive the second sealing plug on the insert block to seal the expansion valve hole.

The method of testing using any of the above devices comprises the steps of:

(1) the expansion valve hole is sealed under the action of the cylinder;

(2) air in the box body and the expansion valve is extracted to reach a vacuum state and simultaneously connected with a helium mass spectrometer;

(3) filling helium into the expansion valve;

(4) and analyzing whether the expansion valve leaks or not according to the helium mass spectrometer detection helium gas value.

Preferably, under the condition that the sealing performance is very good and the expansion valve does not leak, a person skilled in the art calculates the content of the helium gas as a reference value according to experience and numerical values, and if the helium mass spectrometer detects that the numerical value of the helium gas is larger than the reference value in the device, the leakage of the expansion valve is indicated; on the contrary, if the helium mass spectrometer detects that the value of the helium gas is smaller than the reference value, the expansion valve does not leak.

The invention has the following beneficial effects:

(1) the inspection device disclosed by the invention is a sealing test designed for the expansion valve of the expansion valve hole which is vertically arranged, the expansion valve is sealed by adopting the principle of a mold core-pulling structure and utilizing the air cylinder to drive the sliding block to move, and the structure is simple and easy to realize;

(2) according to the invention, the insert is provided with the limiting pull rod with the spring, so that the base plate and the insert are always in a tensioning state, the door-shaped sliding block and the base are also always in a tensioning state, the second sealing plug is always abutted against the expansion valve, and a sealing condition is provided for the whole detection;

(3) according to the invention, the second sealing plug connected with the insert is extruded to abut against the inside of the expansion valve hole by the extrusion of the door-shaped sliding block, so that the device is ensured to be in absolute sealing;

(4) according to the invention, the cylinder drives the first clamping block and the box block to move together, so that the integral moving track of the whole structure and the driving insert are ensured to realize sealing, and the power of the device is simplified.

Drawings

Fig. 1 is an external schematic view of the present invention.

Fig. 2 is a view showing the internal structure of the case of the present invention.

Fig. 3 is a schematic diagram of the present invention case.

Fig. 4 is a view showing the internal structure of the case on the front surface of the gate slider of the present invention.

FIG. 5 is a schematic view of the connection of the portal slider and base of the present invention.

FIG. 6 is a schematic view of a portal slider of the present invention.

FIG. 7 is a schematic view of the interior of a door shaped slider and base of the present invention.

Fig. 8 is a schematic view of the base of the present invention.

Fig. 9 is a schematic view of the oblique slider of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, and it should be noted that the embodiments are merely illustrative of the present invention and should not be considered as limiting the invention, and the purpose of the embodiments is to make those skilled in the art better understand and reproduce the technical solutions of the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims.

As shown in fig. 1-2, the invention provides a helium detection device for an expansion valve, the device includes a cylinder 1 and a box body 2, the top surface of the box body 2 is connected to the cylinder 1, one side of the box body 2 is provided with a surface which is separable from the box body, a straight slide rail 3, a box block 4, a door-shaped slide block 5, a base 6 and a chassis 7 are arranged in the box body 2, the cylinder 1 is connected to the box block 2, a first clamping block 8 is arranged on one side of the box block 4, the first clamping block 8 moves along the direction of the straight slide rail 3, a clamping groove 50 for sliding the base 6 is arranged in the door-shaped slide block 5, and the chassis 7 is arranged below the base 6.

Preferably, a circular through hole 21 is formed in one side of the box body 2, a vacuum pumping device is connected in the circular through hole 21, the vacuum pumping device adopts the prior art, the protection of the invention is not required, and the detailed description is omitted.

Preferably, the straight slide rail 3 is fixedly connected in the box body 2.

As shown in fig. 3, the box 4 is L-shaped, a U-shaped groove 411 is formed in the long side portion 41 of the L-shape of the box 4, the depth of the portion 4111 of the U-shaped arc bottom of the U-shaped groove 411 is greater than the depths of other grooves of the U-shaped groove, the cylinder 1 is placed in the U-shaped arc bottom 4111 of the U-shaped groove 411, a thimble for connection of the cylinder 1 is provided with a protruding end portion, and the protruding end portion is clamped in the U-shaped groove 411.

As shown in fig. 4-5, two connecting columns 412 are disposed on the L-shaped long side portion 41 of the box block 4, the connecting columns 412 cross two ends of the L-shaped long side portion 41 of the box block to be connected to the first clamping block 8, two rectangular through holes 420 are disposed on the L-shaped short side portion 42 of the box block 4, and a limiting column 421 is disposed in each rectangular through hole 420.

Preferably, spacing post 421 below is equipped with fixed block 9, be equipped with the through-hole in the fixed block 9, spacing post 421 can alternate in the through-hole of fixed block 9, fixed block 9 is connected second fixture block 91, second fixture block 91 fixed connection straight slide rail 3, second fixture block 91 is unanimous with the 8 shape sizes of first fixture block, and when first fixture block 8 slided along straight slide rail 3, spacing post 221 alternates in the through-hole of fixed block 9 prevents that the case piece 4 from having slight deviation at the removal in-process.

The junction of the L-shaped long side part 41 of the box block 4 and the L-shaped short side part 42 of the box block is provided with a rectangular block 43, the rectangular block 43 is fixedly connected with the box block 4, a T-shaped groove 431 is arranged in the rectangular block 43, a matched T-shaped convex block 432 is arranged in the T-shaped groove, and the T-shaped convex block 432 is arranged on the upper top surface of the door-shaped sliding block 5.

As shown in fig. 6, the locking slot 50 includes a rectangular sliding slot 51 and an inclined sliding slot 52, the rectangular sliding slot 51 is disposed on one side of the door-shaped slider 5, the section of the rectangular sliding slot 51 on the upper top surface of the door-shaped slider 5 is trapezoidal, the inclined sliding slot 52 is disposed on the other side of the door-shaped slider 5, the inclined sliding slot 52 is connected to a U-shaped through hole 520 on the upper top surface of the door-shaped slider 5, and a backing plate 53 is disposed below the U-shaped through hole 520.

As shown in fig. 7, the backing plate 53 is fixedly connected to the door-shaped slider 5, a waist-shaped hole is formed in the backing plate 53, a limit pull rod 54 is arranged in the waist-shaped hole, a spring is arranged on the limit pull rod 54, and the limit pull rod 54 moves in the waist-shaped hole 55.

As shown in fig. 8, the shape of the base 6 is identical to the shape of the "L" at 90 degrees counterclockwise, a rectangular protruding block 611 is arranged on an L-shaped short side 61 of the base, the rectangular protruding block 611 is matched with the rectangular sliding groove 51 of the door-shaped slider, a rectangular groove 621 and two circular grooves 622 are arranged on an L-shaped long side 62 of the base, a first sealing plug 6221 matched with the expansion valve hole is arranged in the circular groove 622, and an inclined slider 63 is arranged in the rectangular groove 621.

As shown in fig. 9, an inclined protrusion block 631 matched with the inclined sliding groove 52 is arranged on the inclined sliding block 63, the inclined protrusion block 631 slides in the inclined sliding groove 52, the cross section of the bottom of the inclined sliding block 63 is rectangular, the inclined sliding block 63 slides in the rectangular groove 51, an insert block 64 is arranged in the inclined sliding block 63, two second sealing plugs 65 are arranged on the insert block 64, and the size of the second sealing plugs 65 is matched with the size of the expansion valve hole.

Preferably, the spring on the stop rod 54 ensures that the tension is always maintained between the backing plate 53 and the insert 64, thereby ensuring that the door-shaped slider 5 and the base 6 are also always maintained in tension so that the second sealing plug 65 always abuts against the expansion valve.

Preferably, the insert 64 ensures that the central positions of the second sealing plug 65 and the expansion valve hole are maintained on the same horizontal line, and if the second sealing plug 65 is not sealed with the expansion valve hole, the limit pull rod 54 moves in the kidney-shaped hole 55 until the central positions of the second sealing plug 65 and the expansion valve hole are adjusted on the same horizontal line.

Preferably, the rectangular protruding block 611 and the inclined sliding block 63 on the base 6 slide along the rectangular sliding slot 51 and the inclined sliding slot 52 of the door-shaped sliding block 5, respectively.

The base plate 7 is provided with a supporting column 71, the base 6, the base plate 7 and the supporting column 71 are respectively provided with a corresponding through hole 711 for placing a pipeline, and the pipeline is used for connecting the expansion valve and the vacuum-pumping device.

Preferably, the step of sealing the device is:

(1) placing the expansion valve on the base;

(2) sealing the box body;

(3) under the action of the cylinder, the door-shaped sliding block is extruded downwards and moves along the direction of the rectangular protruding block on the base;

(4) the inclined sliding block slides in the rectangular groove under the extrusion of the door-shaped sliding block to drive the second sealing plug on the insert block to seal the expansion valve hole.

The steps of the inspection method using the above apparatus include:

s1, sealing the expansion valve hole under the action of the cylinder;

s2, extracting air in the box body and the expansion valve, and connecting the box body and the expansion valve with a helium mass spectrometer when reaching a vacuum state;

s3, filling helium into the expansion valve;

and S4, analyzing whether the expansion valve leaks or not according to the helium value detected by the helium mass spectrometer.

Preferably, under the condition that the sealing performance is very good and the expansion valve does not leak, a person skilled in the art calculates the content of the helium gas as a reference value according to experience and numerical values, and if the helium mass spectrometer detects that the numerical value of the helium gas is larger than the reference value in the device, the leakage of the expansion valve is indicated; on the contrary, if the helium mass spectrometer detects that the value of the helium gas is smaller than the reference value, the expansion valve does not leak.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.