Differential pressure shutter and opening and closing method thereof

Abstract

The invention discloses a pressure difference opening and closing device and an opening and closing method thereof, and belongs to the technical field of refrigerators and freezers. The pressure difference opening and closing device comprises an annular positioning clamping piece, and a plurality of air holes are formed in the inner end face of the annular positioning clamping piece in a penetrating mode; a sealing ring is fixedly installed in an inner cavity of the annular positioning clamping piece, and an elastic movable plug is movably installed in the inner cavity of the annular positioning clamping piece. The elastic movable plug comprises a plug piece part and a plug shaft part; the plug piece part is fixedly installed on the inner cavity wall of the annular positioning clamping piece, and the plug shaft part is sleeved with the sealing ring in a penetrating mode. A plurality of air channels are formed in the shaft surface of the plug shaft part; and the patch part can deform. The elastic movable plug is adopted to replace a traditional threshold value spring and a traditional piston column, so that the number of accessories is reduced, and cost input is reduced; and secondly, the noise generated when the elastic movable plug deforms each time is low, and the mute effect is better when the elastic movable plug is applied.

Description

Technical Field

[0001] The invention relates to the technical field of refrigerators and freezers, and in particular to a pressure difference switch and an opening and closing method thereof. Background Art

[0002] Refrigeration products such as refrigerators and freezers allow air to enter the interior when the door is opened. After the door is closed, the air inside the box is cooled and negative pressure is generated when it is in the refrigeration state for a long time, making it difficult to open the door.

[0003] In the existing patent literature, there is a patent with publication number CN220153057U and name "Pressure Differential Switch and Refrigeration Equipment". This patent mainly uses a threshold spring and a piston column as the "control switch" of the pressure differential switch. However, the "control switch" requires two accessories to be realized, and the investment cost is relatively high; and the spring will also generate certain noise during the compression deformation process. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a pressure differential switch and an opening and closing method thereof. The pressure differential switch adopts an elastic movable plug to replace the traditional threshold spring and piston column, thereby reducing the number of accessories and reducing the cost investment; secondly, the noise generated by each deformation of the elastic movable plug is low, and the silent effect during its application will be better.

[0005] To solve the above technical problems, the technical solution of the present invention is achieved as follows:

[0006] A pressure differential switch comprises an annular positioning card, and a plurality of air holes are formed on the inner end surface of the annular positioning card; the annular positioning card is evenly divided into two groups of semi-annular positioning card, and the two groups of semi-annular positioning card form a complete annular positioning card after being combined, and the semi-annular positioning card is made of hard materials, such as hard PVC, etc.; a sealing ring is fixedly installed in the inner cavity of the two groups of semi-annular positioning card, and an elastic movable plug is movably installed in the inner cavity of the two groups of semi-annular positioning card, and the elastic movable plug is made of a soft material with elasticity, such as elastic soft rubber, etc.; the elastic movable plug is made of a soft material with elasticity, such as elastic soft rubber, etc. The sexual activity plug includes a plug piece part and a plug shaft part, wherein the plug piece part and the plug shaft part are fixedly connected; the plug piece part is fixedly installed on the inner cavity wall of two groups of semi-annular positioning clamps, and the plug shaft part is penetrated and sleeved in the sealing ring; the axial surface of the plug shaft part is provided with a plurality of air passages distributed in a circumferential array along its axial direction, wherein the length of the air passage is L4; the plug piece part can be deformed; when the air passage of the plug shaft part does not pass through the sealing ring, the air inside and outside the annular positioning clamp does not circulate; when the air passage of the plug shaft part just passes through the sealing ring, the air inside and outside the annular positioning clamp circulates with each other.

[0007] By adopting the above scheme, the pressure differential switch uses an elastic movable plug to replace the traditional threshold spring and piston rod, thereby reducing the number of accessories and reducing the cost investment; secondly, the noise generated by the elastic movable plug each time it is deformed is low, and the silent effect during its application will be better.

[0008] As a preferred embodiment of a pressure differential switch, the outer side surface of the plug part is a convex arc surface, and the inner side surface of the plug part is a concave arc surface; the convex arc surface of the outer side surface of the plug part can be deformed into a concave arc surface after being subjected to a force, wherein the deformation of the plug part causes the displacement of the plug shaft part to be L1.

[0009] By adopting the above scheme, in order to enable the plug part to deform, the two side surfaces of the plug part are respectively designed as a convex arc surface and a concave arc surface. Then, when the plug part is deformed, the displacement of the plug shaft part can be accurately controlled.

[0010] As a preferred implementation of the pressure differential switch, a protrusion is provided in the middle of the inner wall of the sealing ring, wherein the width of the protrusion is L2.

[0011] With the above solution, in order to facilitate smoother air flow, a protrusion is provided in the middle of the inner wall of the sealing ring, so that the fluidity of air passing through the sealing ring will be better.

[0012] As a preferred embodiment of the differential pressure switch, the raised portion of the sealing ring and the plug shaft portion are in interference fit, wherein the maximum distance between the end of the plug shaft portion and the raised portion is L3.

[0013] By adopting the above scheme, in order to ensure the sealing effect of the sealing ring, the raised part of the sealing ring and the plug shaft part are designed to have an interference fit relationship, which can further improve the sealing between the two.

[0014] As a preferred embodiment of a pressure differential switch, the inner end surface of the semi-annular positioning clamp at the location of the air vent is a concave surface, and the concave depth of the concave surface is L5.

[0015] In order to prevent the food in the refrigerator or freezer from blocking the ventilation holes, the ventilation holes are provided on the inner concave surface, so that the ventilation holes will not be completely blocked by the food.

[0016] As a preferred embodiment of a pressure differential switch, the maximum friction force between the raised portion of the sealing ring and the plug shaft portion is N1, and the force exerted by the external air pressure to push the convex arc surface of the outer side surface of the plug piece portion to deform into a concave arc surface is N; wherein N1<N.

[0017] By adopting the above scheme, in order to ensure that the plug sheet portion is deformed to cause the plug shaft portion to be displaced, it is set that N1<N, which can smoothly ensure the opening or closing of the airway.

[0018] As a preferred embodiment of a pressure differential switch, slot one and slot two are provided on the inner cavity wall of the two groups of semi-annular positioning clips, wherein slot one is located at the outer end of slot two; the plug piece part of the elastic movable plug is clamped in slot one, and the sealing ring is clamped in slot two.

[0019] By adopting the above solution, in order to facilitate the disassembly or installation of the elastic movable plug and the sealing ring, the two are respectively fixed by snap connection, which will be more convenient during the later disassembly or installation.

[0020] A method for opening and closing a pressure differential switch is implemented by using the pressure differential switch, and the pressure differential switch is installed on a refrigeration product (such as a refrigerator, a freezer, etc.) for application, and the implementation steps are:

[0021] S1. When the interior of the refrigeration product is in a negative pressure state due to long-term refrigeration, the external air pressure is greater than the air pressure inside the refrigeration product. Once N1 < N, the external air pressure pushes the convex arc surface of the outer side of the plug part to deform into a concave arc surface;

[0022] S2. Subsequently, the displacement of the plug shaft is L1 due to the deformation of the plug sheet. When L1>L2, the air passage of the plug shaft just penetrates the protrusion of the sealing ring. At this time, the outside air flows into the inside of the refrigeration product until the outside air pressure is equal to the internal air pressure of the refrigeration product.

[0023] S3, since the plug part is in a deformed state at this time, then under the action of its automatic elastic tension N2, the outer side surface of the plug part rebounds from the concave arc surface to the convex arc surface until the outer side surface of the plug part returns to the convex arc surface, and the airway is closed again;

[0024] S4. Repeat the above steps, and the pressure difference switch will automatically balance the air pressure inside and outside the refrigeration product.

[0025] After adopting the above technical solution, the beneficial effects of the present invention are:

[0026] 1. The pressure differential switch uses an elastic active plug to replace the traditional threshold spring and piston rod, thereby reducing the number of accessories and reducing the cost investment; secondly, the elastic active plug generates low noise each time it is deformed, and the silent effect during application will be better;

[0027] 2. In order to allow the plug part to deform, the two side surfaces of the plug part are designed as a convex arc surface and a concave arc surface respectively. Then, when the plug part is deformed, the displacement of the plug shaft part can be accurately controlled;

[0028] 3. In order to facilitate smoother air flow, a bulge is set in the middle of the inner wall of the sealing ring, so that the air will have better fluidity when passing through the sealing ring;

[0029] 4. In order to ensure the sealing effect of the sealing ring, the convex part of the sealing ring and the plug shaft are designed to have an interference fit relationship, which can further improve the sealing between the two;

[0030] 5. In order to prevent the food in the refrigerator or freezer from blocking the ventilation holes, the ventilation holes are opened on the inner concave surface. In this way, the ventilation holes will not be completely blocked by the food;

[0031] 6. In order to ensure that the plug shaft is displaced after the plug is deformed, N1 is set to be less than N, which can smoothly ensure the opening or closing of the airway;

[0032] 7. In order to facilitate the removal or installation of the elastic movable plug and the sealing ring, the two are fixed separately, which will be more convenient during the later removal or installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 It is a three-dimensional structural diagram of the pressure difference switch;

[0035] Figure 2 This is an exploded view of the pressure differential switch;

[0036] Figure 3 It is a direct view of the inner end surface of the differential pressure switch;

[0037] Figure 4 It is a direct view of the outer end surface of the differential pressure switch;

[0038] Figure 5 It is a cross-sectional view of the differential pressure switch when the air passage is closed;

[0039] Figure 6 It is a cross-sectional view of the differential pressure switch when the air passage is opened;

[0040] Figure 7 for Figure 1 A three-dimensional structural diagram of the middle semi-annular positioning card;

[0041] Figure 8 This is a three-dimensional structural diagram of a pressure differential switch installed on a refrigerator / freezer;

[0042] Fig. 9 It is a partial cross-sectional view of the pressure differential switch in the refrigerator / freezer;

[0043] Markings in the figure: 1-semi-annular positioning card; 2-sealing ring; 3-elastic movable plug; 4-air vent; 5-airway; 6-slot one; 7-slot two. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] like Figures 1 to 6 As shown, a differential pressure switch comprises an annular positioning card, and a plurality of air holes 4 are formed on the inner end surface of the annular positioning card; the annular positioning card is evenly divided into two groups of semi-annular positioning card 1, and the two groups of semi-annular positioning card 1 form a complete annular positioning card after being combined, and the semi-annular positioning card 1 is made of hard material, such as hard PVC, etc.; a sealing ring 2 is fixedly installed in the inner cavity of the two groups of semi-annular positioning card 1, and an elastic movable plug 3 is movably installed in the inner cavity of the two groups of semi-annular positioning card 1, and the elastic movable plug 3 is made of a soft material with elasticity, such as elastic soft rubber, etc.; The elastic movable plug 3 includes a plug sheet part and a plug shaft part, wherein the plug sheet part and the plug shaft part are fixedly connected; the plug sheet part is fixedly installed on the inner cavity wall of the two groups of semi-annular positioning fixtures 1, and the plug shaft part is inserted and sleeved in the sealing ring 2; the axial surface of the plug shaft part has multiple circumferentially arrayed air channels 5 along its axial direction, wherein the length of the air channel 5 is L4; the plug sheet part can be deformed; when the air channel 5 of the plug shaft part does not pass through the sealing ring 2, the air inside and outside the annular positioning fixture does not circulate; when the air channel 5 of the plug shaft part just passes through the sealing ring 2, the air inside and outside the annular positioning fixture circulates with each other. The pressure differential switch adopts the elastic movable plug 3 to replace the traditional threshold spring and piston column, thereby reducing the number of accessories and reducing the cost investment; secondly, the noise generated by the elastic movable plug 3 each time it is deformed is low, and the silent effect when it is used will be better.

[0046] like Figures 5 and 6As shown, the outer side of the plug part is a convex arc surface, and the inner side of the plug part is a concave arc surface; the convex arc surface of the outer side of the plug part can be deformed into a concave arc surface after being subjected to a force, wherein the deformation of the plug part causes the displacement of the plug shaft part to be L1. In order to allow the plug part to deform, the two sides of the plug part are designed as a convex arc surface and a concave arc surface respectively, so that when the plug part is deformed, the displacement of the plug shaft part can be accurately controlled.

[0047] like Figures 5 and 6 As shown, a protrusion is provided in the middle of the inner side wall of the sealing ring 2, wherein the width of the protrusion is L2. In order to facilitate smoother air flow, a protrusion is provided in the middle of the inner side wall of the sealing ring 2, and the fluidity of air passing through the sealing ring 2 will be better.

[0048] The raised part of the sealing ring 2 and the plug shaft part are in an interference fit, wherein the maximum distance between the end of the plug shaft part and the raised part is L3. In order to ensure the sealing effect of the sealing ring 2, the raised part of the sealing ring 2 and the plug shaft part are designed to have an interference fit, which can further improve the sealing between the two.

[0049] like Figures 5 and 6 As shown, the inner end surface of the semi-circular positioning fixture 1 where the air hole 4 is located is an inner concave surface, and the concave depth of the inner concave door is L5. In order to prevent the food in the refrigerator or freezer from blocking the air hole 4, the air hole 4 is opened on the inner concave surface, so that the air hole 4 will not be completely blocked by the food.

[0050] The maximum friction between the convex part of the sealing ring 2 and the plug shaft is N1, and the force of the external air pressure pushing the convex arc surface of the outer side of the plug piece to deform into a concave arc surface is N; where N1 < N. In order to ensure that the plug shaft part is displaced after the plug piece part is deformed, N1 < N is set to ensure that the airway 5 can be opened or closed smoothly.

[0051] like Figure 7 As shown, the inner cavity walls of the two sets of semi-annular positioning clamps 1 are provided with a clamping groove 1 6 and a clamping groove 2 7, wherein the clamping groove 1 6 is located at the outer end of the clamping groove 2 7; the plug piece portion of the elastic movable plug 3 is clamped in the clamping groove 1 6, and the sealing ring 2 is clamped in the clamping groove 2 7. In order to facilitate the removal or installation of the elastic movable plug 3 and the sealing ring 2, the two are clamped and fixed respectively, which will be more convenient during the later removal or installation.

[0052] like Figures 8 to 9 As shown, a method for opening and closing a pressure differential switch is implemented using the pressure differential switch, and the pressure differential switch is installed on a refrigeration product (such as a refrigerator, a freezer, etc.) for application, and the implementation steps are:

[0053] S1. When the interior of the refrigeration product is in a negative pressure state due to long-term refrigeration, the external air pressure is greater than the air pressure inside the refrigeration product. Once N1 < N, the external air pressure pushes the convex arc surface of the outer side of the plug part to deform into a concave arc surface;

[0054] S2. Subsequently, the displacement of the plug shaft is L1 due to the deformation of the plug sheet. When L1>L2, the air passage 5 of the plug shaft just penetrates the protrusion of the sealing ring 2. At this time, the outside air flows into the inside of the refrigeration product until the outside air pressure is equal to the internal air pressure of the refrigeration product.

[0055] S3, since the plug part is in a deformed state at this time, then under the action of its automatic elastic tension N2, the outer side surface of the plug part rebounds from the concave arc surface to the convex arc surface until the outer side surface of the plug part returns to the convex arc surface, and the airway 5 is closed again;

[0056] S4. Repeat the above steps, and the pressure difference switch will automatically balance the air pressure inside and outside the refrigeration product.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure differential switch, comprising an annular positioning clamp, wherein a plurality of air holes (4) are formed through the inner end surface of the annular positioning clamp; Features: The annular positioning card is evenly divided into two groups of semi-annular positioning card (1), and the two groups of semi-annular positioning card (1) form a complete annular positioning card after being combined; A sealing ring (2) is fixedly installed in the inner cavity of the two groups of semi-annular positioning clamps (1), and an elastic movable plug (3) is movably installed in the inner cavity of the two groups of semi-annular positioning clamps (1); The elastic movable plug (3) comprises a plug sheet part and a plug shaft part, wherein the plug sheet part and the plug shaft part are fixedly connected; the plug sheet part is fixedly mounted on the inner cavity wall of two groups of semi-annular positioning clamps (1), and the plug shaft part penetrates and is sleeved in the sealing ring (2); The shaft surface of the plug shaft portion is provided with a plurality of air channels (5) distributed in a circumferential array along its axial direction, wherein the length of the air channels (5) is L4; The plug piece portion is capable of deformation; when the air passage (5) of the plug shaft portion does not pass through the sealing ring (2), the air inside and outside the annular positioning card does not circulate; when the air passage (5) of the plug shaft portion just passes through the sealing ring (2), the air inside and outside the annular positioning card circulate with each other.

2. The pressure differential switch according to claim 1, characterized in that: The outer side surface of the plug piece part is a convex arc surface, and the inner side surface of the plug piece part is a concave arc surface; the convex arc surface of the outer side surface of the plug piece part can be deformed into a concave arc surface after being subjected to a force, wherein the deformation of the plug piece part causes the displacement of the plug shaft part to be L1.

3. The differential pressure switch according to claim 2, characterized in that: A protrusion is provided in the middle of the inner side wall of the sealing ring (2), wherein the width of the protrusion is L2.

4. The pressure differential switch according to claim 3, characterized in that: The convex part of the sealing ring (2) and the plug shaft part are in interference fit, wherein the maximum distance between the end of the plug shaft part and the convex part is L3.

5. The pressure differential switch according to claim 4, characterized in that: The inner end surface of the semi-annular positioning fixture (1) where the air vent (4) is located is a concave surface, and the concave depth of the concave surface is L5.

6. The pressure differential switch according to claim 5, characterized in that: The maximum friction force between the convex part of the sealing ring (2) and the plug shaft part is N1, and the force exerted by the external air pressure on the outer side surface of the plug piece part to push the convex arc surface to deform into a concave arc surface is N; Where N1<N.

7. The pressure differential switch according to claim 6, characterized in that: A first clamping groove (6) and a second clamping groove (7) are provided on the inner cavity wall of the two groups of semi-annular positioning clamps (1), wherein the first clamping groove (6) is located at the outer end of the second clamping groove (7); the plug piece portion of the elastic movable plug (3) is clamped in the first clamping groove (6), and the sealing ring (2) is clamped in the second clamping groove (7).

8. The pressure differential switch according to claim 7, characterized in that: The elastic movable plug (3) is made of a soft material with elasticity.

9. The pressure differential switch according to claim 8, characterized in that: The semi-annular positioning clamp (1) is made of hard material.

10. A method for opening and closing a pressure differential switch, characterized in that: The method is implemented by using the pressure differential switch according to claim 9, and the pressure differential switch is installed on a refrigeration product for application, and the implementation steps are as follows: S1. When the interior of the refrigeration product is in a negative pressure state due to long-term refrigeration, the external air pressure is greater than the air pressure inside the refrigeration product. Once N1 < N, the external air pressure pushes the convex arc surface of the outer side of the plug part to deform into a concave arc surface; S2. Subsequently, the displacement of the plug shaft portion is L1 due to the deformation of the plug sheet portion. When L1>L2, the air passage (5) of the plug shaft portion just penetrates the protrusion of the sealing ring (2). At this time, the outside air flows into the interior of the refrigeration product until the outside air pressure is equal to the internal air pressure of the refrigeration product. S3, since the plug part is in a deformed state at this time, then under the action of its automatic elastic tension N2, the outer side surface of the plug part rebounds from the concave arc surface to the convex arc surface until the outer side surface of the plug part returns to the convex arc surface, and the airway (5) is closed again; S4. Repeat the above steps, and the pressure difference switch will automatically balance the air pressure inside and outside the refrigeration product.

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