4 different dendrochilum species from the collection of my parents. The last 2 are labeled Dendrochilum compactum but I haven't been able to find this name anywhere. They seem to belong in section Platyclinis.
Dendrochilum coccineum
Dendrochilum convallariaeforme var. convallariaeforme
Dendrochilum gracile var. gracile
Dendrochilum gracile var. gracile
Dendrochilum gracile var. gracile the 2 different variants side by side.
The first photo is of Dendrochilum coccineum. The second photo could be Dendrochilum convallariaeforme var. convallariaeforme, although I need to sanity check it, it is in that group anyway.
The last few photos all appear to be Dendrochilum gracile var. gracile. This is a very varied species, I like the plant you have with the very long side lobes.