A pressure balance check valve and a refrigeration display cabinet having the same

Abstract

The application provides a pressure balance check valve and a refrigeration display cabinet with the same, and belongs to the field of refrigerators. The pressure balance check valve can solve the problems of the traditional refrigeration display cabinet, such as large pressure difference between the inside and outside of the cabinet, difficult opening, air permeation frost, and loud noise. The pressure balance check valve comprises an upper connecting pipe assembly, a liquid seal box, and a pressure balance pipe assembly. The upper connecting pipe assembly comprises an upper connecting pipe, a check pipe, and a branch pipe line. The upper end of the upper connecting pipe is connected with a drain pipe of an evaporator water box. The check pipe is connected with the lower end of the upper connecting pipe, and a check ball is arranged in the check pipe and sealed by a sealing cap. The lower end of the upper connecting pipe and the check pipe are jointly installed in the liquid seal box, and a water outlet of the liquid seal box is connected with a lower drain pipe. The pressure balance pipe assembly comprises a connecting pipe and a pressure balance pipe. One end of the connecting pipe is inserted into the branch pipe line, and the other end of the connecting pipe is connected with the pressure balance pipe. A pressure balance ball is arranged in the pressure balance pipe, and an air permeation cap is arranged to seal the pressure balance pipe. The pressure balance check valve has the functions of pressure balance, silent check, and liquid sealing.

Description

Technical Field

[0001] This invention belongs to the field of freezer technology, and particularly relates to a pressure balance check valve and a freezer display cabinet having the pressure balance check valve. Background Technology

[0002] During use, the internal temperature of a freezer display case can reach very low levels, ranging from -25°C to -30°C. This creates a significant pressure difference between the inside and outside of the case, making it difficult for users to open the door. Additionally, there are generally two ways to connect the drain pipe to the drip tray in a freezer:

[0003] (1) The drain pipe is directly connected to the water box without liquid sealing, which allows outdoor air to enter the box and cause severe frost buildup inside. (2) A siphon bend is connected to the end of the drain pipe or it is directly inserted into a small water box. Although this can prevent outdoor air from entering the box, when the door is opened to take out the goods and then closed, the water in the siphon bend or liquid-sealed box will flow back rapidly due to the sudden drop in pressure inside the box. This will produce a lot of noise from the mixture of airflow and water, affecting the user experience.

[0004] Therefore, the large pressure difference between the inside and outside of the chamber, the frosting during ventilation, and the high noise caused by the pressure change after opening and closing the door due to gas and water backflow are problems that urgently need to be solved. Summary of the Invention

[0005] This invention addresses the technical problems of traditional refrigerated display cases, such as large pressure differences between the inside and outside of the case, which cause difficulty in opening the door, frost buildup during ventilation, and loud noise from gas and water backflow. It proposes a pressure-balancing check valve and a refrigerated display case incorporating this valve. This pressure-balancing check valve has a pressure-balancing function, prevents air from entering the case from causing frost buildup, and also provides a liquid seal and prevents backflow, thus eliminating noise caused by backflow.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A pressure-balanced check valve, comprising:

[0008] The upper connecting pipe assembly includes an upper connecting pipe, a check pipe, and branch pipes; the upper end of the upper connecting pipe is connected to the drain pipe of the evaporator water receiving box inside the freezer display case; the check pipe is connected to the lower end of the upper connecting pipe, and the two are interconnected; the cavity inside the check pipe is equipped with a check float ball, which is sealed by a sealing cap; the sealing cap has a leakage hole; the check float ball can rise with the water level and fit tightly against the inlet at the lower end of the upper connecting pipe to liquid seal the drain pipe of the evaporator water receiving box; the branch pipes are located on the upper end of the upper connecting pipe wall, and the two are interconnected.

[0009] A liquid seal box is disposed below the upper pipe assembly, and the lower end of the upper pipe assembly and the check pipe connected to its lower end are installed inside the liquid seal box. The outlet of the liquid seal box is connected to the lower drain pipe inside the freezer display case.

[0010] The air pressure balancing pipe assembly includes a connecting pipe and an air pressure balancing pipe; one end of the connecting pipe is inserted into the branch pipe and communicates with the upper connecting pipe; the other end of the connecting pipe is connected to the air pressure balancing pipe, and the cavity inside the air pressure balancing pipe is filled with an air pressure balancing float and sealed by a vent cap. The air pressure balancing float can float up and down inside the air pressure balancing pipe with pressure changes. By the contact and separation between the air pressure balancing float and the vent cap, the entry of external air into the air pressure balancing check valve is controlled.

[0011] In one embodiment, the lower end of the upper pipe and the check pipe connected thereto are connected to the liquid seal box by a snap fastener, and the outlet of the liquid seal box is located at the bottom of the liquid seal box.

[0012] In one embodiment, the outer periphery of the lower end of the check tube is provided with an external thread, and the sealing cap is provided with an internal thread that matches the external thread. By screwing the sealing cap onto the lower end of the check tube, the check float is blocked.

[0013] In one embodiment, the pressure balancing pipe assembly is disposed entirely above the liquid seal box; wherein, the connecting pipe further includes a horizontal portion and a bent portion; the horizontal portion is inserted into the branch pipe and communicates with the upper connecting pipe, and the bent portion is connected to the pressure balancing pipe so that the pressure balancing pipe and the upper connecting pipe assembly remain parallel.

[0014] In one embodiment, the vent cap has a vent, which is an arc shape that fits against the curved surface of the pressure balance float.

[0015] In one embodiment, a baffle is also provided inside the pressure balancing pipe.

[0016] In one embodiment, the diameter of the check valve is larger than that of the upper connecting pipe, and the diameter of the pressure balancing pipe is larger than that of the connecting pipe.

[0017] A freezer display case includes a cabinet body and a door body, the door body being mounted on the cabinet body. It also includes the pressure balancing check valve described in the above embodiment, the pressure balancing check valve being disposed on the cabinet body and used to balance the pressure difference between the inside and outside of the cabinet body.

[0018] In one embodiment, when the freezer display case is in its normal state, the pressure balance float falls to the bottom of the pressure balance tube and fits tightly against the arc-shaped vent of the vent cap, blocking the vent to prevent outside air from entering the freezer display case.

[0019] In one embodiment, when the freezer display case is in use, the refrigeration system of the freezer display case is running, the pressure inside the case decreases, the pressure balance float in the pressure balance pipe rises, causing the pressure balance float to separate from the arc-shaped vent, and external air enters the pressure balance check valve, then enters the evaporator through the drain pipe of the evaporator water box, is cooled by the evaporator, and is blown into the case by the evaporation fan, thus achieving pressure balance inside the case.

[0020] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0021] 1. This invention proposes a pressure-balanced check valve, which has three functions: pressure balancing, silent backflow prevention, and liquid sealing. Under normal conditions, the pressure-balancing float falls to the bottom and fits tightly against the arc-shaped vent of the vent cap, blocking the vent and preventing external air from entering the cabinet. When the refrigeration system of the freezer display cabinet starts to refrigerate, the pressure inside the cabinet gradually decreases, and the pressure-balancing float in the pressure-balancing pipe rises. There is a baffle in the pressure-balancing pipe to block the rising float and prevent it from blocking the upper inlet. At this time, the float separates from the arc-shaped vent, and external air enters the pressure-balanced check valve, enters the evaporator through the drain pipe, is cooled by the evaporator, and is blown into the cabinet by the evaporation fan. This not only achieves pressure balance inside the cabinet but also prevents external air from entering the cabinet and causing frost. At the same time, the door is easy to open.

[0022] 2. The present invention proposes a pneumatic pressure balance check valve, which has the characteristics of simple structure and convenient production. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the pneumatic pressure balance check valve provided by the present invention.

[0024] Figure 2 An exploded view of the pressure-balanced check valve provided by this invention;

[0025] Figure 3 A perspective view of the pressure-balanced check valve provided by the present invention;

[0026] Figure 4 This is a schematic diagram of the assembly of the upper pipe assembly and the air pressure balance pipe assembly provided by the present invention;

[0027] Figure 5 A perspective view of the liquid-sealed box provided by the present invention;

[0028] Figure 6 A perspective view of the liquid-sealed box provided by the present invention;

[0029] Figure 7 This is an assembly diagram of the baffle provided by the present invention;

[0030] Figure 8 This is a schematic diagram showing the installation of the pressure-balanced check valve provided by the present invention on a refrigerated display case.

[0031] Figure 9 This is a schematic diagram of the structure of the refrigerated display case provided by the present invention.

[0032] In the above figures:

[0033] 1. Pressure-balanced check valve; 2. Top pipe; 3. Check pipe; 4. Branch pipe; 5. Check float; 6. Sealing cap; 7. Leak hole; 8. Liquid seal box; 9. Outlet; 10. Connecting pipe; 11. Pressure-balanced pipe; 12. Pressure-balanced float; 13. Vent cap; 14. Baffle; 15. Clip; 16. Cabinet; 17. Evaporator water collection box drain pipe; 18. Bottom drain pipe; 19. Evaporator fan; 20. Evaporator; 21. Evaporator water collection box; 22. Condenser; 23. Condenser fan; 24. Water collection box; 25. Divider plate; 26. Water level line. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments provided by this invention without inventive effort are within the scope of protection of this invention.

[0035] Obviously, the accompanying drawings described below are merely some examples or embodiments of the present invention. Those skilled in the art can apply the present invention to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this invention, modifications to design, manufacturing, or production based on the technical content disclosed in this invention are merely conventional technical means and should not be construed as insufficient disclosure of the present invention.

[0036] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention may be combined with other embodiments without conflict.

[0037] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "a," "an," "an," "the," and similar words used in this invention do not indicate quantity limitation and may indicate singular or plural. The terms "comprising," "including," "having," and any variations thereof used in this invention are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms "connected," "linked," and similar words used in this invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "A plurality" in this invention refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships may exist; for example, "A and / or B" can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects have an "or" relationship. The terms "first," "second," etc., used in this invention are merely to distinguish similar objects and do not represent a specific ordering of objects.

[0038] This invention provides a pressure-balanced check valve and a freezer display case incorporating the pressure-balanced check valve. Figure 1-9 The following diagrams illustrate the overall structure of the pressure-balanced check valve according to embodiments of the present invention: an exploded view of the pressure-balanced check valve, a perspective view of the pressure-balanced check valve, an assembly diagram of the upper connecting pipe assembly and the pressure-balanced pipe assembly, a perspective view of the liquid seal box, a perspective view of the liquid seal box, an assembly diagram of the baffle plate, an installation diagram of the pressure-balanced check valve on a freezer display case, and a structural diagram of the freezer display case. (Reference) Figure 1-9As shown, the pressure-balanced check valve includes at least: an upper pipe assembly, a liquid seal box 8, and a pressure-balanced pipe assembly; wherein, the upper pipe assembly includes an upper pipe 2, a check pipe 3, and a branch pipe 4; the upper end of the upper pipe 2 is connected to the drain pipe 17 of the evaporator water receiving box in the freezer display case; the check pipe 3 is connected to the lower end of the upper pipe 2, and the two are interconnected. The cavity inside the check pipe 3 is equipped with a check float 5, which is sealed by a sealing cap 6. The sealing cap 6 has a water leakage hole 7 to facilitate the smooth flow of water. The check float 5 can rise with the water level and fit tightly against the inlet at the lower end of the upper pipe 2 to liquid seal the drain pipe 17 of the evaporator water receiving box (specifically, after the evaporator 20 defrosts, condensate will be generated. The condensate enters the liquid seal box 8 of the pressure-balanced check valve 1 through the evaporator water receiving box 21 and the drain pipe. The check float 5 in the upper pipe 2 will rise with the water level until it fits tightly against the arc-shaped inlet in the upper pipe 2. After liquid sealing, air will not enter through the drain pipe). (Frost forms inside the cabinet when air enters); Branch pipe 4 is located on the upper end of the upper pipe 2, and the two are interconnected, used to assemble the pressure balance pipe assembly; Liquid seal box 8 is located below the upper pipe assembly. Liquid seal box 8 is a cuboid structure with an internal cavity. This cavity is used to accommodate the lower end of the upper pipe 2 and the check pipe 3 connected to its lower end. The outlet 9 of liquid seal box 8 is connected to the drain pipe 18 inside the freezer display case; The pressure balance pipe assembly includes a connecting pipe 10 and a pressure balance pipe 11; One end of the connecting pipe 10 is inserted into the branch pipe 4 and is interconnected with the upper pipe 2; The other end of the connecting pipe 10 is connected to the pressure balance pipe 11. The cavity inside the pressure balance pipe 11 is filled with a pressure balance float 12 and sealed by a vent cap 13. The pressure balance float 12 can float up and down inside the pressure balance pipe 11 as the pressure changes. By the fit and separation of the pressure balance float 12 and the vent cap 13, the entry of external air into the pressure balance check valve 1 is controlled.

[0039] Among them, reference Figure 2 The lower end of the upper pipe 2 and the check pipe 3 connected to its lower end are connected to the liquid seal box 8 by a buckle 15. The outlet 9 of the liquid seal box 8 is located at the bottom of the liquid seal box 8.

[0040] Among them, reference Figure 2 The outer periphery of the lower end of the check pipe 3 is provided with an external thread, and the sealing cap 6 is provided with an internal thread that matches the external thread. By screwing the sealing cap 6 onto the lower end of the check pipe 3, the check float 5 is sealed to prevent it from falling off.

[0041] Among them, reference Figure 3 The pressure balance pipe assembly is positioned above the liquid seal box 8; the connecting pipe 10 further includes a horizontal section and a bent section; the horizontal section is inserted into the branch pipe 4 and communicates with the upper pipe 2, and the bent section is connected to the pressure balance pipe 11 so that the pressure balance pipe 11 is parallel to the upper pipe assembly.

[0042] The vent cap 13 has a vent, which is an arc shape that fits with the arc surface of the pressure balance float 12 (not shown in the figure). When the freezer display case is in normal operation (i.e., non-cooling operation), the pressure balance float 12 falls to the bottom of the pressure balance pipe 11 and fits with the arc-shaped vent of the vent cap 13, blocking the vent and preventing air from entering the cabinet. When the refrigeration system of the freezer display case starts cooling, the pressure inside the case will gradually decrease. At this time, the pressure balance float 12 in the pressure balance pipe 11 will rise. A baffle 14 is installed inside the pressure balance pipe 11 to block the pressure balance float 12 and prevent it from blocking the upper inlet of the pressure balance pipe 11. At this time, the pressure balance pipe 11 is separated from the arc-shaped vent. External air enters the pressure balance check valve 1 and enters the evaporator 20 through the drain pipe 17 of the evaporator water box. After being cooled by the evaporator 20, it is blown into the case by the evaporator fan 19. This can achieve pressure balance inside the case and prevent external air from entering the case and causing frost. At the same time, the door is easy to open.

[0043] Among them, the diameter of the check pipe 3 is larger than that of the upper pipe 2, and the diameter of the air pressure balance pipe 11 is larger than that of the connecting pipe 10.

[0044] This invention also provides a freezer display case with a pressure-balancing check valve listed in any of the above embodiments, including a cabinet body 16 and a door body, the door body being assembled on the cabinet body 16, and also including a pressure-balancing check valve 1 listed in any of the above embodiments, the pressure-balancing check valve 1 being disposed on the cabinet body 16.

[0045] The following section, using the pressure-balancing check valve listed in any of the above embodiments and a freezer display case equipped with the pressure-balancing check valve, will specifically explain the triple functions of the pressure-balancing check valve: pressure balancing, silent backflow prevention, and liquid sealing.

[0046] (1) When the freezer display case is in normal condition, the air pressure balance float 23 falls to the bottom of the air pressure balance pipe 11 and fits tightly with the arc-shaped air vent of the vent cap 13, blocking the air vent to prevent outside air from entering the freezer display case.

[0047] (2) When the freezer display case is in use, the refrigeration system of the freezer display case is running, the pressure inside the case decreases, the pressure balance float 12 in the pressure balance pipe 11 rises, so that the pressure balance float 12 separates from the arc-shaped vent, and the outside air enters the pressure balance check valve 1, and then enters the evaporator 20 through the evaporator water box drain pipe 17. After being cooled by the evaporator 20, it is blown into the cabinet by the evaporation fan 19 to achieve pressure balance inside the cabinet.

[0048] (3) Silent backflow prevention process: After the evaporator 20 defrosts, condensate will be generated. The condensate enters the liquid seal box 8 of the pressure balance check valve 1 through the evaporator water box 21 and the evaporator water box drain pipe 17. The check float 5 in the upper pipe 2 will rise with the water level until it is tightly fitted with the arc-shaped inlet in the upper pipe 2. After liquid sealing, air will not enter the cabinet through the evaporator water box drain pipe 17 and cause frost. When the customer opens the door, the pressure inside and outside the cabinet will reach a balance. When the door is closed, the temperature inside the cabinet is still very low due to the short opening time. The air inside the cabinet is quickly cooled by the evaporator 20, and the pressure will drop sharply. At this time, there will be a strong suction in the drain pipe. The check float 5 is tightly fitted with the arc-shaped inlet in the upper pipe 2. The water will not flow back and there will be no airflow mixing sound. At the same time, the pressure balance check valve 1 starts to work to balance the air pressure inside the cabinet.

[0049] When a large amount of condensate is generated inside the cabinet, the condensate enters the pressure balance check valve 1, and the water level exceeds the water level line. Figure 3 As shown, the liquid flows over the partition plate 25, exits through the drain pipe connected to the outlet 9 of the liquid seal box 8, and then flows through the lower drain pipe 18 into the lower water receiving box of the tank (i.e., Figure 9 Within the water inlet (No. 24), the condensate evaporates through the high-temperature evaporation tube inside the lower water inlet box.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A pneumatic pressure balancing check valve, characterized in that, include: The top connection assembly includes the top connection, check valve, and branch lines; The upper end of the upper connecting pipe is connected to the drain pipe of the evaporator water receiving box inside the freezer display case; The check valve is connected to the lower end of the upper connecting pipe, and the two are interconnected. The cavity inside the check valve is filled with a check valve float, which is sealed by a sealing cap. The sealing cap has a leakage hole. The check valve float can rise with the water level and fit tightly against the inlet at the lower end of the upper connecting pipe to liquid seal the drain pipe of the evaporator water receiving box. The branch pipe is set on the upper end of the upper connecting pipe wall, and the two are interconnected. A liquid seal box is disposed below the upper pipe assembly, and the lower end of the upper pipe assembly and the check pipe connected to its lower end are installed inside the liquid seal box. The outlet of the liquid seal box is connected to the lower drain pipe inside the freezer display case. The air pressure balancing pipe assembly includes a connecting pipe and an air pressure balancing pipe; one end of the connecting pipe is inserted into the branch pipe and communicates with the upper connecting pipe; the other end of the connecting pipe is connected to the air pressure balancing pipe, and the cavity inside the air pressure balancing pipe is filled with an air pressure balancing float and sealed by a vent cap. The air pressure balancing float can float up and down inside the air pressure balancing pipe with pressure changes. By the contact and separation between the air pressure balancing float and the vent cap, the entry of external air into the air pressure balancing check valve is controlled.

2. The pneumatic pressure balancing check valve according to claim 1, characterized in that, The lower end of the upper pipe and the check pipe connected to its lower end are connected to the liquid seal box by a snap fastener, and the outlet of the liquid seal box is located at the bottom of the liquid seal box.

3. The pneumatic pressure balancing check valve according to claim 1, characterized in that, The outer periphery of the lower end of the check tube is provided with an external thread, and the sealing cap is provided with an internal thread that matches the external thread. By screwing the sealing cap onto the lower end of the check tube, the check float is blocked.

4. The pneumatic pressure balancing check valve according to claim 1, characterized in that, The pressure balancing pipe assembly is disposed above the liquid seal box; wherein, the connecting pipe further includes a horizontal part and a bent part; the horizontal part is inserted into the branch pipe and communicates with the upper connecting pipe, and the bent part is connected to the pressure balancing pipe so that the pressure balancing pipe and the upper connecting pipe assembly remain parallel.

5. The pneumatic pressure balancing check valve according to claim 1, characterized in that, The vent cap has an air vent, which is an arc shape that fits into the arc surface of the air pressure balance float.

6. The pneumatic pressure balancing check valve according to claim 1, characterized in that, The pressure balance pipe is also equipped with a baffle plate inside.

7. The pneumatic pressure balancing check valve according to claim 1, characterized in that, The diameter of the check valve is larger than that of the upper connecting pipe, and the diameter of the pressure balancing pipe is larger than that of the connecting pipe.

8. A refrigerated display case, comprising a cabinet body and a door, wherein the door is mounted on the cabinet body, characterized in that, It also includes a pressure-balanced check valve as described in any one of claims 1 to 7, wherein the pressure-balanced check valve is disposed on the cabinet.

9. The refrigerated display case according to claim 8, characterized in that, When the freezer display case is in normal condition, the pressure balance float falls to the bottom of the pressure balance tube and fits tightly against the arc-shaped vent of the vent cap, blocking the vent and preventing outside air from entering the freezer display case.

10. The refrigerated display case according to claim 8, characterized in that, When the freezer display case is in use, the refrigeration system of the freezer display case is running, the pressure inside the case decreases, the pressure balance float in the pressure balance pipe rises, causing the pressure balance float to separate from the arc-shaped vent, and outside air enters the pressure balance check valve, and then enters the evaporator through the drain pipe of the evaporator water box. After being cooled by the evaporator, it is blown into the case by the evaporation fan, thus achieving pressure balance inside the case.

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