Explosion-proof structure of high and low temperature test box

Abstract

The utility model relates to an explosion-proof structure of a high and low temperature test chamber, which comprises a pressure relief door which is rotatably connected with one side of a pressure relief opening and can be in sealing fit with the pressure relief opening, the pressure relief door and a test chamber body are locked through a locking structure, when the air pressure in the test chamber body exceeds a set pressure value, the locking structure is unlocked, the pressure relief door pops outwards, and the pressure relief door is locked. A pressing part which is in sliding fit with the sliding groove is arranged outside the test box body, the pressing part can automatically move downwards until the lower side of the pressing part is lower than the lower side of the pressure relief door, so that the bounced pressure relief door is pressed into the pressure relief opening to keep the pressure relief opening in a closed state, and the pressure relief door and the test box body are locked again through a locking structure. The explosion-proof structure of the high and low temperature test box not only can automatically relieve pressure of the test box body, but also can automatically reset the pressure relief door at the first time after pressure relief is completed, manual operation is not needed, and potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of test equipment, in particular to an explosion-proof structure of a high and low temperature test box. Background Art

[0002] When conducting high and low temperature tests, the samples to be tested are placed in the test chamber body for testing. The test chamber body is usually equipped with an explosion-proof structure, including a pressure relief door arranged on one side of the test chamber body. The pressure relief door is also called a safety door or emergency pressure relief valve. It is used to automatically open when the pressure inside the test chamber body exceeds the set value to release excessive pressure and prevent explosion.

[0003] A pressure relief port is provided on the test chamber body, and a pressure relief door is rotatably connected to one side of the pressure relief port and can be sealed therewith. In the initial state, the pressure relief door and the test chamber body are locked together by a locking structure. When the air pressure inside the test chamber body exceeds the set pressure value, the locking structure is unlocked, and the pressure relief door pops outward to automatically relieve the pressure. However, the existing pressure relief door has some shortcomings: after it automatically pops open and the pressure relief is completed, it needs to be manually reset to keep the test chamber body sealed. Due to the particularity of the experimental environment of the high and low temperature chamber, it is usually easy to cause high or low temperature changes in the environment around the pressure relief port during pressure relief. Manual personnel need to be very careful when performing the resetting action to avoid injury. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide an explosion-proof structure for a high and low temperature test chamber in response to the above-mentioned defects, which can automatically reset the pressure relief door as soon as the pressure relief is completed, without the need for manual operation, thereby reducing safety hazards.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an explosion-proof structure of a high and low temperature test chamber, including a pressure relief door rotatably connected to one side of a pressure relief port and capable of sealing therewith, the pressure relief door is locked to the test chamber body by a locking structure, when the air pressure inside the test chamber body exceeds a set pressure value, the locking structure is unlocked, and the pressure relief door pops outward, and a pressing portion that slides with a slide groove is provided on the outside of the test chamber body, and the pressing portion can automatically move downward to a lower side thereof below the lower side of the pressure relief door, thereby pressing the pop-up pressure relief door into the pressure relief port and keeping it in a closed state.

[0006] Explanation: A through pressure relief port is provided on one side of the test chamber body, and a slide groove is provided in the vertical direction on the outside of the test chamber body just above the pressure relief port.

[0007] The working principle of this scheme is that in the initial state, the pressing part slides to the bottom of the slide groove under the action of gravity and is located on the outside of the pressure relief door. The pressure relief door is sealed and fixed in the pressure relief port by a locking structure, so that the interior of the test chamber body remains sealed, so that the test can be carried out. When the pressure inside the test chamber body gradually increases and reaches or exceeds the preset pressure value, the pressure of the internal gas will overcome the locking force of the locking structure, and the pressure relief door is pushed open. When the pressure relief door rotates outward, the pressing part moves upward, causing the high-pressure gas to be discharged from the pressure relief port, thereby reducing the internal pressure. When the internal pressure drops below the set pressure value, the pressure relief door is no longer subjected to a force to rotate it outward. At this time, the pressing part can slide to the bottom of the slide groove under the action of gravity and press the pressure relief door, so that the pressure relief door returns to a state of sealing matching with the pressure relief port, and the pressure relief door is locked to the test chamber body again through the locking structure.

[0008] Compared with the existing technology, the beneficial effect of this solution is that: when the pressure inside the test chamber body is greater than the set pressure value, the locking structure is unlocked and the pressure relief door is pushed open, thereby automatically relieving the pressure of the test chamber body; when the pressure inside the test chamber body drops below the set pressure value, the pressing part can press the pressure relief door under the action of gravity, so that the pressure relief door returns to a state of sealing matching with the pressure relief port, so that the pressure relief door can be automatically reset as soon as the pressure relief is completed, without the need for manual reset of the pressure relief door, reducing safety hazards; and the pressure relief door can also be doubly locked and sealed by the pressing part and the locking structure.

[0009] As a preferred embodiment of the present invention, the pressing portion includes a pressing plate, the inner side of which is provided with a slider for slidingly cooperating with the slide groove, and the pressing plate can move along the slide groove until its lower side is higher than the lower side of the pressure relief door.

[0010] The beneficial effects of this solution are: the slider located on the inner side of the pressing plate not only cooperates with the sliding groove in a sliding manner, but also guides the movement of the pressing plate in the vertical direction. If the pressing plate can move along the sliding groove to the point where its lower side is lower than the lower side of the pressure relief door, it will affect the rotation of the pressure relief door, thereby making it impossible to relieve pressure.

[0011] As a preferred embodiment of the present invention, the pressing portion further includes a pressing block arranged on the inner side of the pressing plate, and the pressing block can move with the pressing plate to the inner side thereof and abut against the outer side of the pressure relief door.

[0012] The beneficial effects of this solution are: the inner side of the pressing block abuts against the outer side of the pressure relief door to limit the pressure relief door inserted into the pressure relief port, thereby preventing the pressure relief door from bouncing outward when the air pressure inside the test chamber body has not yet reached the set pressure value, thereby avoiding affecting the test. If the inner side of the pressing plate directly abuts against the outer side of the pressure relief door, it will cause a certain degree of influence on the rotation of the pressure relief door, thereby affecting the pressure relief process.

[0013] As a preferred embodiment of the present invention, the widths of the pressing plate and the pressing block are both greater than the width of the pressure relief door.

[0014] The beneficial effects of this solution are as follows: the widths of the pressing plate and the pressing block are both greater than the width of the pressure relief door, which can provide a certain degree of sealing effect around the area where the pressure relief door and the pressure relief port are in contact.

[0015] As a preferred embodiment of the present invention, the slide groove is a T-shaped slide groove, and the slider is a T-shaped slider matching the T-shaped slide groove.

[0016] The beneficial effects of this solution are as follows: the sliding cooperation between the T-shaped slider and the T-shaped slot can limit the pressing plate in the horizontal direction, preventing the pressing plate from falling from the test chamber body, and allowing the pressure relief door to spring open outward under the action of the air pressure in the test chamber body, thereby avoiding affecting the test results;

[0017] As a preferred embodiment of the present invention, a first compression spring is provided at the top of the slide groove, the lower end of the first compression spring is connected to the upper side of the slider, and the pressing plate is driven downward by the first compression spring.

[0018] The beneficial effect of this solution is that compared with the downward movement of the pressing plate driven by its own gravity, the downward movement of the pressing plate driven by the first compression spring can ensure that the pressing plate moves downward more smoothly under the drive of the first compression spring.

[0019] As a preferred embodiment of the present invention, an elastic sealing ring for engaging with the annular groove is provided on the inner side of the pressure relief door.

[0020] Explanation: An annular groove is provided on the test box body around the pressure relief port.

[0021] The beneficial effect of this solution is that the elastic sealing ring located on the inner side of the pressure relief door is engaged with the annular groove, ensuring that the pressure relief door has good sealing performance when closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of an explosion-proof structure embodiment of a high and low temperature test chamber of the present utility model.

[0023] Figure 2 It is a cross-sectional view of the high and low temperature test chamber of the utility model.

[0024] Figure 3 for Figure 1 Schematic diagram of the structure after the middle pressure relief door is pushed open.

[0025] Figure 4 for Figure 1 Schematic diagram of the structure of the test chamber body.

[0026] Figure 5 for Figure 1 Schematic diagram of the structure of the middle pressing part.

[0027] Figure 6 for Figure 1 Schematic diagram of the structure of the middle pressure relief door. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described below are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0029] The terms "first", "second" and the like in the specification, claims and embodiments of this application are used to distinguish similar objects rather than to describe a specific order or sequential sequence.

[0030] The present invention is further described in detail below through preferred specific embodiments:

[0031] The reference numerals in the drawings of the specification include: test box body 1, slide groove 101, pressure relief port 102, annular groove 103, pressure relief door 2, protrusion 201, pressing plate 3, slider 4, pressing block 5, first compression spring 6, elastic sealing ring 7, locking structure 8.

[0032] As attached Figure 4 As shown: a through pressure relief port 102 is provided on one side of the test box body 1, and the pressure relief port 102 is stepped. An annular groove 103 is provided on the test box body 1 around the pressure relief port 102, and two slide grooves 101 are symmetrically provided in the vertical direction at the outside of the test box body 1 directly above the pressure relief port 102, and each slide groove 101 is a T-shaped slide groove.

[0033] As attached Figures 1 to 3 , and attached Figure 6As shown: the explosion-proof structure of the high and low temperature test chamber of this embodiment includes a pressure relief door 2 that is rotatably connected to one side of the pressure relief port 102 and can be sealed therewith, and the pressure relief door 2 is locked to the test chamber body 1 through a locking structure 8. The locking structure 8 in this embodiment includes a connecting portion arranged on the inner side of the pressure relief door 2 and a locking portion on the test chamber body 1 located on the lower side of the pressure relief port 102, and grooves with circular cross sections are opened on both sides of the connecting portion. There are two locking portions symmetrically arranged, and an accommodating cavity is provided on the locking portion. A bolt is threadedly connected to one side of the locking portion, and one end of the bolt is located in the accommodating cavity and is fixedly connected to one end of the second compression spring, and the other end of the second compression spring is fixedly connected to a ball for engaging with the groove on the connecting portion. In the locked state, the second compression spring is in a natural state, and the two locks The balls in the fixed part extend out of the accommodating cavity and engage with the grooves on both sides of the connecting part, thereby fixing the pressure relief door 2 on the test box body 1. When the pressure inside the test box body 1 exceeds the set pressure value, the pressure of the gas inside the test box body 1 drives the second compression spring to contract. The contraction of the second compression spring drives the balls to retract into the accommodating cavity and no longer engage with the groove. The pressure relief door 2 is no longer fixed to the test box body 1, so that the pressure relief door 2 pops out outward, which is not shown in the figure. The locking structure 8 is a prior art, so it will not be described in detail here. The inner side of the pressure relief door 2 is provided with a protrusion 201 for engaging with the pressure relief port 102, and the inner side of the pressure relief door 2 is provided with an elastic sealing ring 7 for engaging with the annular groove 103. The elastic sealing ring 7 is located around the protrusion 201.

[0034] As attached Figure 1 and attached Figure 5 As shown: the outside of the test box body 1 is provided with a pressing part that slides with the slide groove 101, and the pressing part can automatically move down to its lower side above the lower side of the pressure relief door 2, thereby pressing the pop-up pressure relief door 2 into the pressure relief port 102 and keeping it in a closed state. Specifically, the pressing part includes a pressing plate 3, and the inner side of the pressing plate 3 is provided with two sliders 4 for sliding with the two slide grooves 101. Both sliders 4 are T-shaped sliders that match the T-shaped slide groove. A first compression spring 6 is provided at the top of the slide groove 101, and the lower end of the first compression spring 6 is connected to the upper side of the slider 4. The pressing plate 3 is driven downward by the first compression spring 6, and the pressing plate 3 can move along the slide groove 101 to its lower side above the lower side of the pressure relief door 2.

[0035] The pressing portion also includes a pressing block 5 arranged on the inner side of the pressing plate 3. The pressing block 5 can move with the pressing plate 3 to its inner side and abut against the outer side of the pressure relief door 2. The width of the pressing plate 3 and the pressing block 5 are both greater than the width of the pressure relief door 2.

[0036] Specific pressure relief and reset process

[0037] In the initial state, the pressing plate 3 slides to the bottom of the slide groove 101 under the action of gravity and the first compression spring 6. At this time, the lower side of the pressing plate 3 is higher than the lower side of the pressure relief door 2, and the inner side of the pressing block 5 abuts against the outer side of the pressure relief door 2. The pressure relief door 2 is fixed in the pressure relief port 102 by the locking structure 8 and the pressing part, so that the interior of the test box body 1 remains sealed, so as to carry out the test. When the pressure inside the test box body 1 reaches the preset pressure value, the pressure of the internal gas will overcome the locking force of the locking structure 8, and the pressure relief door 2 is pushed open. When the pressure relief door 2 rotates outward, the pressing plate 3 and the pressing block 5 move up accordingly, and the pressure relief door 2 is no longer limited, so that the high-pressure gas is discharged from the pressure relief port 102, thereby reducing the internal pressure. When the internal pressure drops to normal pressure, it is no longer A force is applied to the pressure relief door 2 to rotate it outward, and the pressure relief door 2 rotates to a position close to the initial state under the action of its own gravity. At this time, the pressing plate 3 also slides to the bottom of the slide groove 101 under the action of its own gravity and the first compression spring 6, and presses the pressure relief door 2 through the pressing block 5, so that the pressure relief door 2 is restored to a state of sealing and matching with the pressure relief port 102. During this process, the connecting part in the locking structure first presses the ball of the locking part to retract it into the accommodating cavity. When the pressure relief door 2 rotates to a state of sealing and matching with the pressure relief port 102, the groove on the connecting part also rotates to a position corresponding to the ball. Driven by the second compression spring, the ball extends out of the accommodating cavity and into the groove, and the pressure relief door 2 is locked to the test box body 1 again through the locking structure.

[0038] The preferred embodiment of the present application is described in detail above in conjunction with the accompanying drawings. The typical well-known structures and common knowledge technologies in the preferred embodiment are not described in detail here. Ordinary technicians in the relevant field can, under the inspiration given by this embodiment, improve and implement the technical solution of the present utility model in combination with their own abilities. Some typical well-known structures, well-known methods or common knowledge technologies should not become obstacles for ordinary technicians in the relevant field to implement this application.

[0039] The scope of protection required by this application shall be based on the contents of its claims, and the contents of the utility model, specific implementation methods and the contents recorded in the drawings of the specification shall be used to interpret the claims.

[0040] Within the technical concept of this application, several modifications may be made to the specific implementation methods of this application, and these modified implementation methods should also be considered to be within the scope of protection of this application.

Claims

1. An explosion-proof structure for a high and low temperature test chamber, comprising a pressure relief door rotatably connected to and sealingly engaged with one side of a pressure relief port. The pressure relief door is locked to the test chamber body by a locking structure. When the air pressure inside the test chamber body exceeds a set pressure value, the locking structure is unlocked, and the pressure relief door pops outward. The structure is characterized by: The outside of the test box body is provided with a pressing part that slides with the slide groove. The pressing part can automatically move downward to a lower side below the lower side of the pressure relief door, thereby pressing the pop-up pressure relief door into the pressure relief port to keep it in a closed state, and locking the pressure relief door and the test box body again through the locking structure.

2. The explosion-proof structure of the high and low temperature test chamber according to claim 1, characterized in that: The pressing portion includes a pressing plate, the inner side of which is provided with a slider for slidingly cooperating with the slide groove. The pressing plate can move along the slide groove until its lower side is higher than the lower side of the pressure relief door.

3. The explosion-proof structure of the high and low temperature test chamber according to claim 2, characterized in that: The pressing portion further includes a pressing block disposed on the inner side of the pressing plate. The pressing block can move along with the pressing plate to the inner side thereof and abut against the outer side of the pressure relief door.

4. The explosion-proof structure of the high and low temperature test chamber according to claim 3, characterized in that: The widths of the pressing plate and the pressing block are both greater than the width of the pressure relief door.

5. The explosion-proof structure of the high and low temperature test chamber according to claim 3, characterized in that: The slide groove is a T-shaped slide groove, and the slider is a T-shaped slider matching the T-shaped slide groove.

6. The explosion-proof structure of the high and low temperature test chamber according to claim 5, characterized in that: A first compression spring is provided on the top of the slide groove, and the lower end of the first compression spring is connected to the upper side of the slider, and the pressing plate is driven to move downward by the first compression spring.

7. The explosion-proof structure of the high and low temperature test chamber according to claim 1, characterized in that: An elastic sealing ring for engaging with the annular groove is provided on the inner side of the pressure relief door.

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