Steamer preheating and water heating device and steamer

Abstract

The present invention discloses a steamer preheating water heating device and a steamer thereof, belonging to the technical field of steamer equipment, comprising a steam generator and a preheating box; a heat exchange coil is fixedly installed in the preheating box, the heat exchange coil is arranged in a spiral shape, and the upper and lower ends of the heat exchange coil are fixedly connected to the water inlet pipe and the water outlet pipe respectively; the upper and lower ends of the preheating box are fixedly connected to the exhaust steam outlet pipe and the residual heat steam inlet pipe respectively, and the water outlet pipe is connected to the water storage tank of the steam generator; a steam secondary heating component is also provided on the side of the steam generator for further increasing the steam temperature. Through the above-mentioned method, by utilizing the steam after the complete steaming operation to preheat the water flowing into the water storage tank of the steam generator, the time for boiling the water in the steam generator is shortened, and by utilizing the high temperature of the combustion chamber of the steam generator to secondary heat the steam in the steam pipe, the time required for steaming food is effectively reduced, making the steamed food more delicious, and the entire structure more energy-efficient.

Description

Technical Field

[0001] The present invention relates to the technical field of steamer equipment, and in particular to a steamer preheating water heating device and a steamer thereof. Background Art

[0002] Chinese patent CN219048073U discloses a rice steaming cabinet, which includes a rice steaming chamber, a tray rack, and a steam generating device. When using the rice steaming cabinet, a tray containing food is placed on a support member. By arranging the steam outlet between adjacent support members, the food on each layer of the support members can directly contact the high-temperature steam flowing out of the steam circulation pipe, so that the food on different layers can be heated simultaneously, reducing the occurrence of uneven heating and improving the efficiency of rice steaming. However, the device also has the following inventions:

[0003] Conventional steaming cabinets use an additional ramp to push the tray rack completely into the steaming cabinet for steaming food. However, this rice steaming cabinet uses a method in which one end of the tray rack bottom plate is connected to the tray frame through a support frame, and the other end is suspended in the air to achieve the function of pushing the tray directly into the steaming cabinet. This function is achieved at the expense of the stability of the tray frame structure. The tray frame has only one end with a fulcrum, and its load-bearing capacity is poor. There is also a risk of shaking during use.

[0004] Based on this, the present invention designs a steamer preheating water heating device and a steamer thereof to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a steamer preheating water heating device and a steamer thereof.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A steam box preheating water heating device, comprising a steam generator and a preheating box;

[0008] A heat exchange coil is fixedly installed in the preheating box. The heat exchange coil is arranged in a spiral shape. The upper and lower ends of the heat exchange coil are fixedly connected to the water inlet pipe and the water outlet pipe respectively. The upper and lower ends of the preheating box are fixedly connected to the waste steam outlet pipe and the residual heat steam inlet pipe respectively. A condensate discharge pipe is also fixedly installed at the lower end of the preheating box; the water outlet pipe is connected to the water storage tank of the steam generator;

[0009] A steam secondary heating component is also provided on the side of the steam generator to further increase the steam temperature.

[0010] Furthermore, the steam secondary heating component includes a heating shell and a steam pipe. The heating shell is fixedly connected to the side wall of the steam generator, and the inner cavity of the heating shell is connected to the fire hole of the combustion chamber of the steam generator. The steam pipe is fixedly connected to the heating shell and passes through the heating shell. The steam inlet end of the heating shell is connected to the steam outlet of the steam generator.

[0011] A steamer, comprising the steam secondary heating assembly as described above, a steamer body and a semi-entry trolley frame;

[0012] The steam box body is provided with a steam chamber with a front opening for accommodating food and steam, a steam inlet pipe is fixedly installed at the lower end of the steam box body, and a steam outlet pipe is fixedly installed at the upper end of the steam box body; the steam inlet pipe is fixedly connected to the steam outlet end of the steam pipeline of the steam secondary heating component, and the steam outlet pipe is fixedly connected to the residual heat steam inlet pipe on the preheating box;

[0013] The semi-entry trolley frame includes an external movable support assembly, an internal tray support assembly and a self-avoidance support assembly. The internal tray support assembly is installed at the upper end of the external movable support assembly, and a self-avoidance support assembly is arranged between the external movable support assembly and the internal tray support assembly; when the internal tray support assembly is fully accommodated by the steam chamber, the internal tray support assembly is supported by the bottom inside the steam chamber, while the external movable support assembly is located at the bottom outside the steamer box body; the self-avoidance support assembly is used to avoid the bottom plate of the steamer box body when the internal tray support assembly enters the steam chamber, and is supported between the external movable support assembly and the internal tray support assembly when the internal tray support assembly leaves the steam chamber to keep the internal tray support assembly stable.

[0014] Furthermore, the internal pallet support assembly includes a pallet frame, a U-shaped plate and a stop rod, one end of the pallet frame is fixedly connected to the connecting frame; a plurality of U-shaped plates are fixedly installed on the inner side of the pallet frame at equal intervals along the height direction of the pallet frame, and the U-shaped plates are used to support and accommodate the pallet; a stop rod is fixedly installed on the rear end of the pallet frame for blocking and limiting the pallet on the U-shaped plate.

[0015] Furthermore, the self-avoidance support assembly includes two groups, which are symmetrically arranged on the left and right sides of the pallet frame.

[0016] Furthermore, the self-avoidance support assembly includes a support roller, a support column, a fixed limit block and a movable limit assembly; the support column is hinged to the lower end of the tray frame, and a torsion spring is provided on the hinge shaft between the support column and the tray frame to rotate the support column backward; a fixed limit block for blocking the support column is fixedly installed on the upper end of the external movable support assembly, and the fixed limit block and the torsion spring cooperate to keep the support column in a vertical state; the support roller is rotatably connected to the tray frame through a bearing, and a slide groove is provided at the bottom of the steamer box body to cooperate with the support roller in a rolling connection; the movable limit assembly is arranged on the external movable support assembly and is located on the side of the support column away from the fixed limit block.

[0017] Furthermore, the movable limit assembly includes a movable limit block, a linkage block, a linkage plate, a support block and an elastic reset structure. A groove is provided on the bottom plate to be connected to the movable limit block for limiting sliding, and the groove can completely accommodate the movable limit block; the movable limit block is fixedly connected to the linkage block, the support block is fixedly connected to the external movable support assembly, and the support block is connected to the linkage block through an elastic reset structure; the linkage plate is fixedly installed on the bottom of the steamer box body, the linkage block and the linkage plate cooperate to slide, and the ends of the linkage plate and the linkage block are provided with inclined surfaces for cooperating sliding.

[0018] Furthermore, the steam stratified and uniformly discharged mechanism includes a self-expanding steam distribution component, a conical plug, a steam flow chamber and a bottom steam plate. The conical plugs are symmetrically fixedly installed on the left and right sides of the inner wall of the rear side of the steamer box body. A steam flow chamber is provided in the tray frame, and an inlet for connecting to the conical plug is opened on the rear side of the tray frame. A bottom steam plate is fixedly installed on the bottom of the steamer box body, and the conical plug and the bottom steam plate are both connected to the steam inlet pipe; a group of self-expanding steam distribution components are provided on the lower side of each U-shaped plate on the tray frame, and each group of self-expanding steam distribution components consists of two self-expanding steam distribution components symmetrically arranged on the left and right; the steam flow chamber is used to provide steam for the self-expanding steam distribution components.

[0019] Furthermore, the self-expanding steam distribution component includes a sleeve, a steam exhaust pipe, a connecting hose and a tension spring. Two sleeves are provided, one end of the sleeve is hinged to the tray frame, and the other end of the sleeve is hinged to the steam exhaust pipe. The connecting hose passes through the sleeve, one end of the connecting hose is connected to the steam flow cavity in the tray frame, and the other end of the connecting hose is connected to the steam exhaust pipe. The hinge points at the ends of the two sleeves are connected to form a parallelogram; a plurality of through holes for steam discharge are evenly opened on the steam exhaust pipe; a tension spring is fixedly installed between the steam exhaust pipe and the tray frame.

[0020] Furthermore, the self-expanding steam distribution component also includes a sliding roller and a convex plate. The sliding roller is rotatably installed on the end of the steam exhaust pipe away from the steam chamber opening, and the convex plate that is rollingly connected to the sliding roller is fixedly installed on the inner wall of the steam box.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. By utilizing the steam after the complete steaming operation to preheat the water in the water tank flowing into the steam generator, the water temperature in the water tank is maintained at about 60 degrees, which greatly shortens the time for the water inlet of the steam generator to boil, prompting the steam generator to quickly heat up and produce steam in a short time, and by utilizing the high temperature of the combustion chamber of the steam generator to secondary heat the steam in the steam pipe, the water content of the steam is reduced by 50%, and the steam temperature is increased to 110 degrees Celsius. The steam after secondary heating is used to steam food, which effectively reduces the time required for steaming food, makes the steamed food more delicious, and makes the entire structure more energy-efficient.

[0022] 2. When the internal tray support assembly is pushed into the steam chamber, the bottom of the steamer body supports the internal tray support assembly. At the same time, the self-avoidance support assembly automatically avoids the bottom plate of the steamer body, and the external movable support assembly moves to the bottom outside the steamer body, so that the food can be loaded into the steam chamber and maintain a stable support effect on the food; when the food is steamed, the internal tray support assembly is pushed out of the steam chamber. When the external movable support assembly and the internal tray support assembly are separated from the steamer body, the self-avoidance support assembly automatically resets so that the internal tray support assembly is supported on the external movable support assembly through multiple points, so as to maintain the stability of the entire structure and make the entire steaming operation convenient and quick.

[0023] 3. In the steam chamber, part of the steam is discharged from the bottom steam plate and flows from bottom to top, while the other part of the steam flows into the steam flow chamber of the tray frame and is discharged from the through-holes of the steam exhaust pipe. The steam without loss is discharged to the bottom of each tray to steam the food, thereby reducing the uneven steaming effect of the food on the upper and lower trays due to the gradual cooling of the steam flowing from bottom to top, and effectively improving the consistency of steamed food in the same batch. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0025] Figure 1 A steamer preheating water heating device and a steamer three-dimensional Figure 1 ;

[0026] Figure 2 This is a front view of a steamer preheating water device and a steamer thereof according to the present invention;

[0027] Figure 3A steamer preheating water heating device and a steamer three-dimensional Figure 2 ;

[0028] Figure 4 A perspective view of a steam secondary heating assembly according to the present invention;

[0029] Figure 5 The semi-entry type cart frame 1 of the present invention;

[0030] Figure 6 The semi-entry type stroller frame 2 of the present invention;

[0031] Figure 7 for Figure 5 Enlarged view of point A in the middle;

[0032] Figure 8 To follow Figure 2 Cross-sectional view in the AA direction;

[0033] Figure 9 To follow Figure 2 Cut away part of the solid in the AA direction Figure 1 ;

[0034] Figure 10 To follow Figure 2 Cut away part of the solid in the AA direction Figure 2 .

[0035] The numbers in the figure represent:

[0036] 10. Steamer body; 11. Steam inlet pipe; 12. Steam outlet pipe; 2. Semi-entry trolley frame; 21. External mobile support assembly; 211. Bottom plate; 212. Connecting frame; 213. Universal wheel; 22. Internal tray support assembly; 221. Tray frame; 222. U-shaped plate; 223. Shift lever; 23. Self-avoidance support assembly; 231. Support roller; 232. Support column; 233. Fixed stop block; 234. Movable stop block; 235. Linkage block; 236. Linkage plate; 237. Support block; 238 , elastic reset structure; 3. Steam stratification and uniform discharge mechanism; 31. Sleeve; 32. Steam exhaust pipe; 33. Connecting hose; 34. Sliding roller; 35. Convex plate; 36. Conical plug; 37. Tension spring; 38. Steam flow chamber; 39. Bottom steam plate; 4. Steam generator; 5. Steam secondary heating component; 51. Heating shell; 52. Steam pipeline; 6. Preheating box; 61. Heat exchange coil; 62. Residual temperature steam inlet pipe; 63. Waste steam outlet pipe; 64. Water inlet pipe; 65. Water outlet pipe; 66. Condensate discharge pipe. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0038] The terms “left,” “right,” “front,” “back,” “up,” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0039] Example 1: In some embodiments, please refer to the accompanying drawings of the specification. Figures 1-4 , a steam box preheating water heating device, comprising a steam generator 4 and a preheating box 6;

[0040] A heat exchange coil 61 is fixedly installed in the preheating box 6. The heat exchange coil 61 is arranged in a spiral shape. The upper and lower ends of the heat exchange coil 61 are fixedly connected to the water inlet pipe 64 and the water outlet pipe 65 respectively. The upper and lower ends of the preheating box 6 are fixedly connected to the exhaust steam outlet pipe 63 and the residual heat steam inlet pipe 62 respectively. A condensate discharge pipe 66 is also fixedly installed at the lower end of the preheating box 6; the water outlet pipe 65 is connected to the water storage tank of the steam generator 4;

[0041] In the present invention, the water that needs to be replenished to the water tank of the steam generator 4 flows from the water inlet pipe 64 into the heat exchange coil 61 and then flows from top to bottom. After completing the steaming operation, the steam with a lowered temperature enters the preheating box 6 through the residual temperature steam inlet pipe 62 and then flows from bottom to top. The water in the heat exchange coil 61 is heated by the residual temperature steam inlet pipe 62, and the steam after heat exchange and cooling is discharged from the waste steam outlet pipe 63, and the heated water flows through the water outlet pipe 65 to the water tank of the steam generator 4, so that the water temperature in the water tank is maintained at about 60 degrees, which greatly shortens the boiling time of the water inlet of the steam generator 4, prompting the steam generator 4 to quickly heat up and produce steam in a short time, thereby achieving energy-saving effects.

[0042] A steam secondary heating component 5 for further increasing the steam temperature is further provided on the side of the steam generator 4 .

[0043] The steam secondary heating component 5 includes a heating shell 51 and a steam pipe 52. The heating shell 51 is fixedly connected to the side wall of the steam generator 4, and the inner cavity of the heating shell 51 is connected to the fire hole of the combustion chamber of the steam generator 4. The steam pipe 52 is fixedly connected to the heating shell 51 and passes through the heating shell 51. The steam inlet end of the heating shell 51 is connected to the steam outlet of the steam generator 4. The steam generated by the steam generator 4 enters the steam pipe 52 and flows through the heating shell 51. The high temperature of the combustion chamber of the steam generator 4 is used to secondary heat the steam in the steam pipe 52, so that the water content of the steam is reduced by 50%, and the steam temperature is increased to 110 degrees Celsius. The steam after secondary heating is used to steam food, which effectively reduces the time required for steaming food, makes the steamed food more delicious, and the steam generator 4 is more energy-efficient.

[0044] The heating shell 51 and the steam pipe 52 are made of high-temperature resistant stainless steel sheets to increase the heating effect of the steam.

[0045] Example 2: In some embodiments, please refer to the accompanying drawings of the specification. Figure 2 、 Figure 3 as well as Figure 5-Figure 8 , a steamer, comprising a steamer body 10 and a semi-entry trolley frame 2;

[0046] The steam box body 10 is provided with a steam chamber with a front opening for accommodating food and steam. A steam inlet pipe 11 is fixedly installed at the lower end of the steam box body 10, and a steam outlet pipe 12 is fixedly installed at the upper end of the steam box body 10; the steam inlet pipe 11 is fixedly connected to the steam outlet end of the steam pipe 52 of the steam secondary heating component 5, and the steam outlet pipe 12 is fixedly connected to the residual heat steam inlet pipe 62 on the preheating box 6;

[0047] The semi-entry trolley frame 2 includes an external movable support assembly 21, an internal tray support assembly 22 and a self-avoidance support assembly 23. The internal tray support assembly 22 is installed at the upper end of the external movable support assembly 21, and a self-avoidance support assembly 23 is arranged between the external movable support assembly 21 and the internal tray support assembly 22; when the internal tray support assembly 22 is fully accommodated by the steam chamber, the internal tray support assembly 22 is supported by the bottom of the steam chamber, while the external movable support assembly 21 is located at the bottom outside the steamer box body 10; the self-avoidance support assembly 23 is used to avoid the bottom plate of the steamer box body 10 when the internal tray support assembly 22 enters the steam chamber, and is supported between the external movable support assembly 21 and the internal tray support assembly 22 when the internal tray support assembly 22 leaves the steam chamber to keep the internal tray support assembly 22 stable.

[0048] In the present invention, the internal tray support assembly 22 is pushed into the steam chamber, so that the bottom of the steamer box 10 supports the internal tray support assembly 22, and at the same time, the self-avoidance support assembly 23 automatically avoids the bottom plate of the steamer box 10, and the external movable support assembly 21 moves to the bottom outside the steamer box 10, so as to realize the loading of food into the steam chamber and maintain a stable support effect on the food; when the food is steamed, the internal tray support assembly 22 is pushed out of the steam chamber, and when the external movable support assembly 21 and the internal tray support assembly 22 are separated from the steamer box 10, the self-avoidance support assembly 23 automatically resets so that the internal tray support assembly 22 is supported on the external movable support assembly 21 through multiple points, so as to maintain the stability of the entire structure and make the entire steaming operation convenient and quick.

[0049] The external mobile support assembly 21 includes a base plate 211, a connecting frame 212 and universal wheels 213. The four corners of the lower end of the base plate 211 are provided with universal wheels 213. The universal wheels 213 can be lockable rollers to increase overall stability when taking and placing trays. The connecting frame 212 is fixedly mounted on one end of the base plate 211.

[0050] The internal pallet support assembly 22 includes a pallet frame 221, a U-shaped plate 222 and a shift rod 223. One end of the pallet frame 221 is fixedly connected to the connecting frame 212. A plurality of U-shaped plates 222 are evenly and evenly fixedly installed on the inner side of the pallet frame 221 along the height direction of the pallet frame 221 at equal intervals. The U-shaped plates 222 are used to support and accommodate pallets. A shift rod 223 is fixedly installed at the rear end of the pallet frame 221 for blocking and limiting the pallet on the U-shaped plate 222.

[0051] The self-avoidance support assembly 23 includes two groups, which are symmetrically arranged on the left and right sides of the pallet frame 221; the self-avoidance support assembly 23 includes a support roller 231, a support column 232, a fixed limit block 233 and a movable limit assembly; the support column 232 is hinged to the lower end of the pallet frame 221, and a torsion spring is provided on the hinge axis of the support column 232 and the pallet frame 221 to enable the support column 232 to rotate backward; a fixed limit block 233 for blocking the support column 232 is fixedly installed on the upper end of the bottom plate 211, and the fixed limit The positioning block 233 and the torsion spring cooperate to keep the support column 232 in a vertical position; the support roller 231 is rotatably connected to the tray frame 221 via a bearing, and a slide groove is provided at the bottom of the steamer body 10 to cooperate with the support roller 231 for rolling connection; and the slide groove is provided with a certain inclination angle, so that the tray frame 221 is slightly lifted when it is pushed into the steam chamber, so that the support column 232 does not contact the bottom plate 211 during rotation; the movable limit assembly is provided on the bottom plate 211 and is located on the side of the support column 232 away from the fixed limit block 233;

[0052] The movable limit assembly includes a movable limit block 234, a linkage block 235, a linkage plate 236, a support block 237 and an elastic reset structure 238. The bottom plate 211 is provided with a groove that is connected to the movable limit block 234 for limiting sliding, and the groove can completely accommodate the movable limit block 234; the movable limit block 234 is fixedly connected to the linkage block 235, and the support block 237 is fixedly connected to the bottom plate 211. The support block 237 is connected to the linkage block 235 via the elastic reset structure 238, so that the linkage block 235 can float vertically; the elastic reset structure 238 can adopt a spring slide rod structure to achieve the vertical floating effect;

[0053] The linkage plate 236 is fixedly mounted on the bottom of the steam box body 10, the linkage block 235 slides with the linkage plate 236, and the front end of the linkage plate 236 and the rear end of the linkage block 235 are provided with inclined surfaces for sliding cooperation;

[0054] In the present invention, the tray frame 221 is pushed into the steam chamber, and the supporting roller 231 slides into the bottom of the steamer box body 10 along the slide groove to support the tray frame 221. At the same time, the linkage plate 236 presses the linkage block 235 down into the groove to avoid the support column 232. The bottom plate of the steamer box body 10 can push the support column 232 smoothly, so that the entire tray frame 221 moves into the steam chamber. After closing the box door, the food is steamed. After steaming is completed, the tray frame 221 is pushed out of the steam chamber. When the bottom plate of the steamer box body 10 and the bottom plate of the steamer box body 10 are aligned, the tray frame 221 is pushed out of the steam chamber. After the support column 232 is detached, the support column 232 is reset under the drive of the torsion spring until the support column 232 is against the fixed limit block 233. When the linkage block 235 is detached from the linkage plate 236, the linkage block 235 is driven to reset and move upward under the action of the elastic reset structure 238 to block the support column 232. The self-avoiding support assembly 23 and the movable limit block 234 cooperate to keep the support column 232 vertical, so that the tray frame 221 is supported by the support column 232 and the connecting frame 212 to ensure the stability of the integrated structure.

[0055] Embodiment 3: In some embodiments, as Figures 8-10As shown, as a preferred embodiment of the present invention, the steam stratified uniform discharge mechanism 3 includes a self-expanding steam distribution component, a conical plug 36, a steam flow chamber 38 and a bottom steam plate 39. The conical plugs 36 are symmetrically fixedly installed on the left and right sides of the inner wall of the rear side of the steamer box body 10. The steam flow chamber 38 is provided in the tray frame 221, and an inlet for plugging with the conical plug 36 is opened on the rear side of the tray frame 221. A rubber layer for increasing sealing is provided on the outside of the conical plug 36. A bottom steam plate 39 is fixedly installed at the bottom of the steamer box body 10, and the conical plug 36 and the bottom steam plate 39 are both connected to the steam inlet pipe 11; a group of self-expanding steam distribution components are provided on the lower side of each U-shaped plate 222 on the tray frame 221, and each group of self-expanding steam distribution components consists of two self-expanding steam distribution components symmetrically arranged on the left and right; the steam flow chamber 38 is used to provide steam for the self-expanding steam distribution components;

[0056] The self-deployed steam distribution component includes a sleeve 31, a steam exhaust pipe 32, a connecting hose 33, a sliding roller 34, a convex plate 35 and a tension spring 37. Two sleeves 31 are provided. One end of the sleeve 31 is hinged to the tray frame 221, and the other end of the sleeve 31 is hinged to the steam exhaust pipe 32. The connecting hose 33 passes through the sleeve 31, and one end of the connecting hose 33 is connected to the steam flow chamber 38 in the tray frame 221, and the other end of the connecting hose 33 is connected to the steam exhaust pipe 32. The hinge points at the ends of the two sleeves 31 are connected to form a parallelogram; a plurality of through holes for steam discharge are evenly provided on the steam exhaust pipe 32; a tension spring 37 is fixedly installed between the steam exhaust pipe 32 and the tray frame 221. When the tension spring 37 is in the natural state, the steam exhaust pipe 32 is in contact with the tray frame 221; a sliding roller 34 is rotatably installed on the end of the steam exhaust pipe 32 away from the steam chamber opening, and a convex plate 35 in rolling connection with the sliding roller 34 is fixedly installed on the inner wall of the steamer box body 10.

[0057] In the present invention, the tray frame 221 is pushed into the steam chamber, and the sliding roller 34 contacts the convex plate 35, driving the steam exhaust pipe 32 to move toward the inside of the tray frame 221. When the tray frame 221 completely enters the steam chamber, the steam exhaust pipe 32 is fully expanded, and the conical plug 36 is plugged into the inlet. Then the door is closed to lock the position of the tray frame 221, and high-temperature steam enters the steam chamber through the steam inlet pipe 11. Part of the steam flows into the steam chamber from the bottom steam plate 39 and flows from bottom to top to steam the food. The other part of the steam flows into the steam flow chamber 38 of the tray frame 221 through the conical plug 36 and is discharged from the through hole of the steam exhaust pipe 32. The steam without loss is discharged to the bottom of each tray to steam the food, thereby reducing the uneven steaming effect of the food on the upper and lower trays due to the gradual cooling of the steam flowing from bottom to top, and effectively improving the consistency of steamed food in the same batch.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A steamer, comprising a steamer preheating and water heating device, a steamer body (10) and a semi-entry trolley frame (2), characterized in that: A steam box preheating water heating device, comprising a steam generator (4) and a preheating box (6); A heat exchange coil (61) is fixedly installed in the preheating box (6), and the heat exchange coil (61) is arranged in a spiral shape. The upper end and the lower end of the heat exchange coil (61) are fixedly connected to the water inlet pipe (64) and the water outlet pipe (65), respectively. The upper end and the lower end of the preheating box (6) are fixedly connected to the waste steam outlet pipe (63) and the residual heat steam inlet pipe (62), respectively. A condensate discharge pipe (66) is also fixedly installed at the lower end of the preheating box (6); the water outlet pipe (65) is connected to the water storage tank of the steam generator (4); A steam secondary heating component (5) for further increasing the steam temperature is also provided on the side of the steam generator (4); The steam secondary heating assembly (5) includes a heating shell (51) and a steam pipe (52), the heating shell (51) is fixedly connected to the side wall of the steam generator (4), and the inner cavity of the heating shell (51) is connected to the fire hole of the combustion chamber of the steam generator (4), the steam pipe (52) is fixedly connected to the heating shell (51) and passes through the heating shell (51), and the steam inlet end of the heating shell (51) is connected to the steam outlet of the steam generator (4); The steam box body (10) is provided with a steam chamber with a front opening for accommodating food and steam, a steam inlet pipe (11) is fixedly mounted on the lower end of the steam box body (10), and a steam outlet pipe (12) is fixedly mounted on the upper end of the steam box body (10); the steam inlet pipe (11) is fixedly connected to the steam outlet end of the steam pipe (52) of the steam secondary heating component (5), and the steam outlet pipe (12) is fixedly connected to the residual heat steam inlet pipe (62) on the preheating box (6); The semi-entry cart frame (2) comprises an external movable support assembly (21), an internal tray support assembly (22) and a self-avoidance support assembly (23), wherein the internal tray support assembly (22) is mounted on the upper end of the external movable support assembly (21), and a self-avoidance support assembly (23) is provided between the external movable support assembly (21) and the internal tray support assembly (22); when the internal tray support assembly (22) is completely accommodated in the steam chamber, the internal tray support assembly (22) is supported by the bottom of the steam chamber, while the external movable support assembly (21) is located at the bottom outside the steam box body (10); the self-avoidance support assembly (23) is used to avoid the bottom plate of the steam box body (10) when the internal tray support assembly (22) enters the steam chamber, and is supported between the external movable support assembly (21) and the internal tray support assembly (22) when the internal tray support assembly (22) leaves the steam chamber so as to keep the internal tray support assembly (22) stable; The internal pallet support assembly (22) includes a pallet frame (221), a U-shaped plate (222) and a stopper (223), one end of the pallet frame (221) is fixedly connected to the connecting frame (212); a plurality of U-shaped plates (222) are fixedly installed at equal intervals along the height direction of the pallet frame (221) on the inner side of the pallet frame (221), and the U-shaped plates (222) are used to support and accommodate the pallets; a stopper (223) is fixedly installed at the rear end of the pallet frame (221) for blocking and limiting the pallet on the U-shaped plate (222); The self-avoidance support assembly (23) comprises a support roller (231), a support column (232), a fixed limit block (233) and a movable limit assembly; the support column (232) is hinged to the lower end of the tray frame (221), and a torsion spring is provided on the hinge shaft between the support column (232) and the tray frame (221) to enable the support column (232) to rotate backward; a fixed limit block (233) for blocking the support column (232) is fixedly installed on the upper end of the external movable support assembly (21), and the fixed limit block (233) and the torsion spring cooperate to keep the support column (232) in a vertical state; the support roller (231) is rotatably connected to the tray frame (221) through a bearing, and a slide groove is provided on the bottom of the steamer box body (10) to cooperate with the support roller (231) for rolling connection; the movable limit assembly is arranged on the external movable support assembly (21) and is located on the side of the support column (232) away from the fixed limit block (233).

2. The steamer according to claim 1, characterized in that The self-avoidance support assembly (23) comprises two groups, which are symmetrically arranged on the left and right sides of the tray frame (221).

3. The steamer according to claim 2, characterized in that: The movable limiting assembly comprises a movable limiting block (234), a linkage block (235), a linkage plate (236), a support block (237) and an elastic reset structure (238); a groove is provided on the bottom plate (211) and is connected to the movable limiting block (234) in a limiting sliding manner, and the groove can completely accommodate the movable limiting block (234); the movable limiting block (234) is fixedly connected to the linkage block (235); the support block (237) is fixedly connected to the external movable support assembly (21); the support block (237) is connected to the linkage block (235) via the elastic reset structure (238); the linkage plate (236) is fixedly mounted on the bottom of the steamer box body (10); the linkage block (235) and the linkage plate (236) slide in cooperation, and the ends of the linkage plate (236) and the linkage block (235) are provided with inclined surfaces for cooperation and sliding.

4. The steamer according to claim 3, characterized in that The steam stratified uniform discharge mechanism (3) comprises a self-expanding steam distribution component, a conical plug (36), a steam flow chamber (38) and a bottom steam plate (39). The conical plugs (36) are symmetrically fixedly installed on the left and right sides of the rear inner wall of the steam box body (10). The steam flow chamber (38) is provided in the tray frame (221), and an inlet for plugging with the conical plug (36) is opened on the rear side of the tray frame (221). The bottom of the steam box body (10) is fixedly installed with a bottom steam plate (39). The conical plug (36) and the bottom steam plate (39) are both connected to the steam inlet pipe (11); a group of self-expanding steam distribution components are provided on the lower side of each U-shaped plate (222) on the tray frame (221), and each group of self-expanding steam distribution components consists of two self-expanding steam distribution components symmetrically arranged on the left and right; the steam flow chamber (38) is used to provide steam for the self-expanding steam distribution components.

5. The steamer according to claim 4, characterized in that: The self-expanding steam distribution component includes a sleeve (31), a steam exhaust pipe (32), a connecting hose (33) and a tension spring (37). Two sleeves (31) are provided, one end of the sleeve (31) is hinged to the tray frame (221), and the other end of the sleeve (31) is hinged to the steam exhaust pipe (32). The connecting hose (33) passes through the sleeve (31), one end of the connecting hose (33) is connected to the steam flow cavity (38) in the tray frame (221), and the other end of the connecting hose (33) is connected to the steam exhaust pipe (32). The hinge points at the ends of the two sleeves (31) are connected to form a parallelogram; a plurality of through holes for steam exhaust are evenly opened on the steam exhaust pipe (32); and a tension spring (37) is fixedly installed between the steam exhaust pipe (32) and the tray frame (221).

6. The steamer according to claim 5, characterized in that The self-expanding steam distribution assembly further comprises a sliding roller (34) and a convex plate (35); the sliding roller (34) is rotatably mounted on one end of the steam exhaust pipe (32) away from the steam chamber opening; and the convex plate (35) is fixedly mounted on the inner wall of the steam box body (10) and is in rolling connection with the sliding roller (34).

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